ID |
Date |
Author |
Type |
Category |
Subject |
13895
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Tue May 29 16:33:04 2018 |
Steve | Update | PEM | air cond filters replaced |
Chris replaced some air condition filters and ordered some replacement filter today.
Quote: |
Quote: |
Quote: |
Yesterday morning was dusty. I wonder why?
The PRM sus damping was restored this morning.
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Yesterday afternoon at 4 the dust count peaked 70,000 counts
Manasa's alergy was bad at the X-end yesterday. What is going on?
There was no wind and CES neighbors did not do anything.
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Air cond filters checked by Chris. The 400 days plot show 3 bad peaks at 1-20, 2-5 & 2-19
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13918
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Wed Jun 6 10:02:52 2018 |
Steve | Update | VAC | RGA scan |
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Attachment 1: RGA302d.png
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Attachment 2: annuloses_NOT_pumped.png
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Attachment 3: temp_vac.png
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13950
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Tue Jun 12 15:32:15 2018 |
Steve | Bureaucracy | General | Salvaged junk from Xend |
Koji's collection of Yend components put away. I cleaned up the Xend bench today.
Loadcells, leveling wedge mounts and related items placed under flowbench cabinet next to Guralp staff.
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13964
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Thu Jun 14 15:24:32 2018 |
Steve | Update | PEM | ADC DAC In Line Test Boards are in |
We have 6 of these boards now in cabinet E7
Quote: |
I wired all 32 channels going to the AA board directly to the ADC as described in the previous log. However, instead of using the old AA board and bypassing the whole circuit, I just used a breakout board as is shown in the first attachment. I put the board back in the rack and reconnected all of the cables.
The seismic BLRMs appear to be working again. A PSD of the BS seismometers is shown in attachment 2. Tomorrow I'll look at how much the ADC alone is suppressing the common mode 60 Hz noise on each of the channels.
Steve: 5 of ADC DAC In Line Test Boards [ D060124 ] ordered. They should be here within 10 days.
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Attachment 1: ADC_DAC_in_(1).JPG
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13970
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Fri Jun 15 08:09:15 2018 |
Steve | Bureaucracy | General | cleaning up at the PSL enclousure |
The cabeling was cleaned up a little bit yesterday morning. The upper back side is still massy. |
Attachment 1: before.jpg
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Attachment 2: after.jpg
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Attachment 3: back_side.jpg
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13971
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Fri Jun 15 09:14:42 2018 |
Steve | Update | General | Oplev sums |
Oplev sums of 240 days.
Quote: |
Since there have been various software/hardware activity going on (stack weighing, AUX laser PLL, computing timing errors etc etc), I decided to do a check on the state of the IFO.
- c1susaux, c1aux and c1iscaux crates were keyed as they were un-telnet-able.
- Single arm locking worked fine, TT alignment was tweaked (as these had drifted due to the ADC failure in c1lsc) to maximize Y arm transmission using the dither servos.
- Arms weren't staying locked for extended periods of time. I particularly suspected ITMX, as I saw what I judged to be excess motion on the Oplev.
- @Steve - ITMX and BS HeNes look like they are in need of replacement judging by the RIN (although the trend data doesn't show any precipitous drop in power). If we are replacing the BS/PRM Oplev HeNe, might be a good time to plan the inejction path a bit better on that table.
- RIN in Attachment #1 has been normalized by the mean value of the OL sum channel. There is now a script to make this kind of plot from NDS in the scripts directory (as I found it confusing to apply different calibrations to individual traces in DTT).
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Attachment 1: opSums.png
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13990
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Wed Jun 20 09:16:56 2018 |
Steve | Update | PEM | dusty lab |
You should wipe off the table cover before you take it off next time.
It is important to turn up the PSL encloure HEPA Variac voltage if you are working in there. It takes less than 10 minutes to reach lab condition.
Lab air count normal. It is not logged. I have a notebook of particle count on the SP table next to the Met One counter.
Quote: |
Chris replaced some air condition filters and ordered some replacement filter today.
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Attachment 1: AP.JPG
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Attachment 2: ITMY.JPG
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Attachment 3: ITMX.JPG
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Attachment 4: SP.JPG
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14004
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Fri Jun 22 08:50:33 2018 |
Steve | Update | SUS | ITMY_UL sensor |
We may lost the UL magnet or LED |
Attachment 1: ITMY_UL.png
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14006
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Fri Jun 22 14:18:04 2018 |
Steve | Update | PSL | Optics on AS table |
Quote: |
Quote: |
Furthermore, I believe we are losing more than 10% of the light due to this BS. The ASDC (which is derived from AS55 PD) level is down at ~110cts as the Michelson is fringing, while it used to be ~200 cts. I will update with a power measurement shortly. But I think we should move ahead with the plan to combine the beam into the IFO's AS mode as discussed at the meeting last week.
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Is the 10% specified for P-Pol or for UNP? I contacted CVI about beamsplitters, since their website doesn't list a BS1-1064-90-... option on the website. They say a R=90% beamsplitter would be a custom job. The closest stock item they got is BS1-1064-95-2025-45UNP specified at R=95% for UNPolarized beams. They were kind enough to sent me the measured transmission curves for a recent lot of these, which is attached was uploaded to the wiki [Elog Police K: NO PROPRIETARY DOCUMENTS ON THE ELOG, which is public. Put it on our wiki and put the link here]. The figure is not labeled, but according to the contact Red is S-Pol and Blue is P-Pol, which means that this one actually has R=~90% for P, pretty much what we want. We'll need to buy two of these to make the swap in the setup.
Back to your original point: There's only a BS1-1064-10-2025-45UNP on the website, so unless we got these as custom items, the R for P-Pol is probably NOT actually 10%, just somewhere between 0% and 20%
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4 std cataloge item fused silica BS1-1064-95-2025-45UNP
ordered today. They will arrive no later than July 13, 2018 |
14028
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Thu Jun 28 08:09:51 2018 |
Steve | Update | CDS | vacuum pneumatic N2 pressure |
The fardest I can go back on channel C1: Vac_N2pres is 320 days
C1:Vac-CC1_Hornet Presuure gauge started logging Feb. 23, 2018
Did you update the " low N2 message" email addresses?
Quote: |
I moved the N2 check script and the disk usage checking script from the (sudo) crontab of nodus to the controls user crontab on megatron .
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Attachment 1: 320d_N2.png
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14031
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Thu Jun 28 13:12:20 2018 |
Steve | Update | safety | surf safety training |
Shruti and Sandrine received 40m specific basic safety training this morning.
Quote: |
Pooja and Keirthana received 40m specific basic safety training.
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14034
|
Mon Jul 2 09:01:11 2018 |
Steve | Update | SUS | ITMY_UL sensor |
This bad connection is coming back
Quote: |
We may lost the UL magnet or LED
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Attachment 1: ITMY_ULcripingback.png
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14059
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Thu Jul 12 16:18:22 2018 |
Steve | Update | VAC | Vent preparations |
We are getting ready to vent.
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Attachment 1: before_Vent.png
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Attachment 2: before_Vent_cond.png
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14066
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Fri Jul 13 16:26:52 2018 |
Steve | Update | VAC | Vent 80 is completing... |
Steve and Aaron,
6 hrs vent is reaching equlibrium to room air. It took 3 and a half instrument grade air cilynders [ AI UZ300 as labelled ] at 10 psi pressure. Average vent speed ~ 2 Torr/min
Valve configuration: IFO at atm and RGA is pumped through VM2 by TP1 maglev.
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Attachment 1: @atm.png
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Attachment 2: vent80_7h.png
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Attachment 3: ventregN2&Air_c.jpg
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14079
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Tue Jul 17 18:16:38 2018 |
Steve | Summary | VAC | pumpdown 81 at 6 hrs |
Precondition: 4 days at atm. Atm5
HEPA tent used during the vent at ETMY It reduced partical count 10 fold of 0.5 and 0.3 micron particals. Atm6
New items in vacuum: Clean manual gate valve [Cetec made] from John Worden with 6" id....as it came from Hanford... [ Throttle able gate valve- TGV ] Atm3
( note: we have 3 more identical in the lab. The original intention was to use them for purging gates )
Optiform Au plated reflector , Induceramics heating elements, similar as existing Cooner cables and related lenses, hardwear. see 14078
OMC related item : none......... 14,110
The pumpdown is at 510 mTorr with RP1 & RP3 still pumping. Koji will shut it down the roughing later tonight. Tomorrow morning I will start the pumping by switching over to TP1 maglev.
Thanks for Koji and Gautam' help of the installation of the manual gate valve. Atm4 This will allow us to control the load on our Varian foreline D70 turbo TP3
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Attachment 1: pd81@6hrs.png
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Attachment 2: before_c.jpg
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Attachment 3: tgv_c.jpg
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Attachment 4: TGVinstalled.jpg
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Attachment 5: 4_days_vent.png
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Attachment 6: tentHEPA.jpg
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14082
|
Wed Jul 18 12:49:08 2018 |
Steve | Summary | VAC | pumpdown 81 at 6 +4.5hrs |
The manual gate valve scan was clean. Atm1 TP1 was pumping on it overnight.
Pumpdown continued to hand over the pumping to TP1 maglev turbo
V1 was opened at P1 400 mTorr with manual gate at 3/4 turn open position as Magev at 560 Hz rotation.
Two aux fans on to hold tubo temps TP1 & TP3 . Atm3
This is the first time we pumping down from atm with ONE small "beer can" turbo and throttled gate valve to control load on small turbo forepump
The 70 l/s turbo is operating at 50k RPM, 0.7 A and 31 C, pumping speed ~ 44 mTorr/h at 200-400 mTorr range with aux drypump in the foreline of TP3
Watching foreline pressures and current one can keep opening gate valve little by little the so the load is optimized. It is working but not fast.
Let's keep small turbo at 0.8 Amp and 32 C max at this pumpdown.
Quote: |
10:20PM
- Opened VM2 to pump down the RGA section with TP1
- Stopped rotary roughing pumps
- Manually closed RV1
- Closed V3
- Stopped RP1 and RP3
- Vented the RP hose
The P1 pressure is 380mTorr. I allowed Gautam to use the full PSL power (~1W).
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Attachment 1: manlGateScan.png
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Attachment 2: handing_over_Mag.png
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Attachment 3: TGVw2auxfans_.jpg
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14083
|
Wed Jul 18 17:36:50 2018 |
Steve | Summary | VAC | pumpdown 81 at 6 +9 hrs completed |
IFO P1 6e-4 Torr, manual gate valve is fully open
The annuloses will be pumped down tomorrow.
Valve configuration: vacuum normal, RGA and annuloses are not pumped
Quote: |
The manual gate valve scan was clean. Atm1 TP1 was pumping on it overnight.
Pumpdown continued to hand over the pumping to TP1 maglev turbo
V1 was opened at P1 400 mTorr with manual gate at 3/4 turn open position as Magev at 560 Hz rotation.
This is the first time we pumping down from atm with one small "beer can" turbo and throttled gate to control load on small turbo forepump
The 70 l/s turbo is operating at 50k RPM, 0.7 A and 31 C, pumping speed ~ 44 mTorr/h at 200-400 mTorr range.
Watching foreline pressures and current one can keep opening gate valve little by little the so the load is optimized. It is working but not fast.
Let's keep small turbo at 0.8 Amp and 32 C max at this pumpdown.
Quote: |
10:20PM
- Opened VM2 to pump down the RGA section with TP1
- Stopped rotary roughing pumps
- Manually closed RV1
- Closed V3
- Stopped RP1 and RP3
- Vented the RP hose
The P1 pressure is 380mTorr. I allowed Gautam to use the full PSL power (~1W).
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Attachment 1: pd81completed.png
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Attachment 2: pd81@30hrs.png
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14087
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Thu Jul 19 11:01:03 2018 |
Steve | Summary | VAC | pd81 @ 2e-5 Torr |
Cold cathode gauge just turned on. |
Attachment 1: pd81@2days.png
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14088
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Thu Jul 19 13:35:30 2018 |
Steve | Summary | VAC | annuloses pumped |
Roughing down the annuloses required closing V1 for 13 minutes
IFO is 2.2e-5 Torr |
Attachment 1: AnsPumped.png
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14090
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Fri Jul 20 07:43:54 2018 |
Steve | Summary | SUS | ETMY |
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Attachment 1: ETMY_leveling.png
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Attachment 2: ETMY.png
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14098
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Mon Jul 23 09:58:52 2018 |
Steve | Summary | VAC | RGA scan at day 6 |
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Attachment 1: pd81-560Hz-d6.png
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14106
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Thu Jul 26 15:11:18 2018 |
Steve | Update | General | Viewports & coating of 2001 |
New optical quality BK-7 windows in 2001 [4 substrates ] AR coated R<0.75 % for 630-1064nm " Azury BLue" broadband : TRX, TRY, ITMY-Oplev & ITMX-Oplev viewports.
The BS-Oplev and PRM-Oplev 10" CF with 5.38" diameter view was coated the same way. The window here is Corning 7056 Borosilicate
5 more BK-7 substrates were coated R <0.1% of 1064 nm "Golden Orange" Their location: IMC-IN, IFO-REF and OMC The next vent we have to confirm optical quality window locations.
All other conflat flange viewports are 7056 Kovar sealed .
Technical notes of 2001 40m upgrade can be seen at LIGO-T010115- 00- R ....page 14 |
Attachment 1: BK7window_Coatings.PDF
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14108
|
Fri Jul 27 10:48:57 2018 |
Steve | Update | SUS | BS oplev window |
Yesterday I inspected this BS oplev viewport. The heavy connector tube was shorting to table so It was moved back towards the chamber. The connection is air tight with kapton tape temporarly.
The beam paths are well centered. The viewport is dusty on the inside.
The motivation was to improve the oplev noise. |
Attachment 1: BSOw_.jpg
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Attachment 2: dustInsideBSO.jpg
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14119
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Tue Jul 31 08:17:55 2018 |
Steve | Update | SUS | Trillium interface box was fixed,reinstalled & working |
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Attachment 1: all_OK.png
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14124
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Thu Aug 2 16:30:08 2018 |
Steve | Update | Treasure | time capsule location |
I 've just found this time capsule note from Nov. 26, 2000 by Kip Thorne: LIGO will discover gravitational waves by Dec.31, 2007
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Attachment 1: time_capsule.JPG
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14137
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Mon Aug 6 09:34:02 2018 |
Steve | Update | VAC | RGA scan at day 20 |
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Attachment 1: pd81d20.png
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14156
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Mon Aug 13 09:56:23 2018 |
Steve | Update | SUS | ETMX trip follow-up |
Here is an other big one
Quote: |
A brief follow-up on this since we discussed this at the meeting yesterday: the attached DV screenshot shows the full 2k data for a period of 2 seconds starting just before the watchdog tripped. It is clear that the timescale of the glitch in the UL channel is much faster (~50 ms) compared to the (presumably mechanical) timescale seen in the other channels of ~250 ms, with the step also being much smaller (a few counts as opposed to the few thousand counts seen in the UL channel, and I guess 1 OSEM count ~ 1 um). All this supports the hypothesis that the problem is electrical and not mechanical (i.e. I think we can rule out the Acromag sending a glitchy signal to the coil and kicking the optic). The watchdog itself gets tripped because the tripping condition is the RMS of the shadow sensor outputs, which presumably exceeds the set threshold when UL glitches by a few thousand counts.
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Attachment 1: ETMXglitch.png
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Attachment 2: ETMXgltch.png
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14167
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Thu Aug 16 07:50:28 2018 |
Steve | Update | VAC | pumpdown 81 at day 30 |
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Attachment 1: pd81d30.png
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14168
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Thu Aug 16 14:48:14 2018 |
Steve | Update | VAC | why do we need a root pump? |
Basic Pump Throughput Concepts
What is Pump Throughput?
The manufacturer of a vacuum pump supplies a chart for each pump showing pumping speed (volume in unit time) vs pressure. The example, for a fictitious pump, shows the pumping speed is substantially constant over a large pressure range.
By multiplying pumping speed by pressure at which that pumping speed occurs, we get a measure called pump throughput. We can tabulate those results, as shown in the table below, or plot them as a graph of pressure vs pump throughput. As is clear from the chart, pump throughput (which might also be called mass flow) decreases proportionally with PRESSURE, at least over the pressure range where pumping speed is constant.
Pumping Speed |
Pressure |
Pressure x Pumping Speed |
100 L/sec |
10 torr |
1000 torr.liter/sec |
100 L/sec |
1 torr |
100 torr.liter/sec |
100 L/sec |
0.1 torr |
10 torr.liter/sec |
100 L/sec |
0.01 torr |
1 torr.liter/sec
|
The roughing pump speed actually will reach 0 l/s at it's ultimate pressure performance.
Our roughing pump pumping speed will slowly drop as chamber pressure drops. Below 10 Torr this decrease is accelerated and bottoms out. This where the Root pump can help. See NASA evaluation of dry rough pumps...What is a root pump
We have been operating succsessfully with a narrow margin. The danger is that the Maglev forline peaks at 4 Torr. This puts load on the small turbo TP2, TP3 & large TP1
The temperature of these TP2 & 3 70 l/s drag turbos go up to 38 C and their rotation speed slow to 45K rpm from 50K rpm because of the large volume 33,000 liters
Either high temp or low rotation speed of drag turbo or long time of overloading can shut down the small turbo pumps......meaning: stop pumping, wait till they cool down
The manual gate valve installed helped to lower peak temp to 32C It just took too long.
We have been running with 2 external fans [one on TP1 & one on TP3] for cooling and one aux drypump to help lowering the foreline pressure of TP2 & 3
The vacuum control upgrade should include adding root pump into the zero pumping speed range.
Atm1, Pump speed chart: TP1 turbo -red, root pump -blue and mechanical pump green. Note green color here representing an oily rotory pump. Our small drypumps [SH-100] typically run above 100 mTorr
They are the forepump of TP2 & 3 Our pumpdown procedure: Oily Leybold rotory pumps ( with safety orifice 350 mT to atm ) rough to 500 mTorr
Here we switch over to TP2 & 3 running at 50k RPM with drypumps SH-100 plus Aux Triscroll
TP1- Maglev rotating full speed when V1 is opened at full volume at 500 mTorr
History: the original design of the early 1990s had no dry scroll pumps. Oil free dry scrools replaced the oily forepumps of TP2 & TP3 in ~2002 at the cost of degrading the forline pressure somewhat.
We had 2 temperature related Maglev failers in 2005 Aug 8 and 2006 April 5 Osaka advised us to use AUX fan to cool TP1 This helped.
Atm2, Wanted Root pump - Leybold EcoDry 65 plus
Atm3, Typical 8 hrs pumpdown from 2007 with TP2 & 3
Atm4, Last pumpdown zoomed in from 400 mT to 1mT with throttled gate valve took 9 hrs The foreline pressure of TP1 peaked at 290 mT, TP3 temperature peaked at 32C
This technic is workable, but 9 hrs is too long.
Atm5, The lowest pressure achived in the 40m Vacuum Envelope 5e-7 Torr with pumps Maglev ~300 l/s, Cryo 1500 l/s and 3 ion pumps of 500 l/s [ in April 2002 at pumpdown 53 day 7 ] with annuloses at ~ 10 mTorr
Atm6, Osaka TG390MCAB Throughput with screen ~300 L/s at 12 cfm backing pump |
Attachment 1: PUMPSPEED_CHAR.pdf
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Attachment 2: Leybold_Broschuere_8Seiten_EN_ANSICHT.pdf
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Attachment 3: pd65.jpg.png
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Attachment 4: pd81completed.png
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Attachment 5: best_.pdf
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Attachment 6: Osaka390.pdf
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14173
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Tue Aug 21 09:16:23 2018 |
Steve | Update | Wiki | AP table layout 20180821 |
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Attachment 1: 20180821.JPG
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14176
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Wed Aug 22 08:44:09 2018 |
Steve | Update | General | earth quake |
6.2M Bandon, OR did not trip any sus
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Attachment 1: yesterday_EQs.png
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14178
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Thu Aug 23 08:24:38 2018 |
Steve | Update | SUS | ETMX trip follow-up |
Glitch, small amplitude, 350 counts & no trip.
Quote: |
Here is an other big one
Quote: |
A brief follow-up on this since we discussed this at the meeting yesterday: the attached DV screenshot shows the full 2k data for a period of 2 seconds starting just before the watchdog tripped. It is clear that the timescale of the glitch in the UL channel is much faster (~50 ms) compared to the (presumably mechanical) timescale seen in the other channels of ~250 ms, with the step also being much smaller (a few counts as opposed to the few thousand counts seen in the UL channel, and I guess 1 OSEM count ~ 1 um). All this supports the hypothesis that the problem is electrical and not mechanical (i.e. I think we can rule out the Acromag sending a glitchy signal to the coil and kicking the optic). The watchdog itself gets tripped because the tripping condition is the RMS of the shadow sensor outputs, which presumably exceeds the set threshold when UL glitches by a few thousand counts.
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Attachment 1: ETMX-UL_glitch.png
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Attachment 2: PEM_4d.png
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14182
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Fri Aug 24 08:04:37 2018 |
Steve | Update | General | small earth quake |
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Attachment 1: small_EQ.png
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14183
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Fri Aug 24 10:51:23 2018 |
Steve | Update | VAC | pumpdown 81 at day 38 |
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Attachment 1: d38.png
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14184
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Fri Aug 24 14:58:30 2018 |
Steve | Update | SUS | ETMX trips again |
The second big glich trips ETMX sus. There were small earth quakes around the glitches. It's damping recovered.
Quote: |
Glitch, small amplitude, 350 counts & no trip.
Quote: |
Here is an other big one
Quote: |
A brief follow-up on this since we discussed this at the meeting yesterday: the attached DV screenshot shows the full 2k data for a period of 2 seconds starting just before the watchdog tripped. It is clear that the timescale of the glitch in the UL channel is much faster (~50 ms) compared to the (presumably mechanical) timescale seen in the other channels of ~250 ms, with the step also being much smaller (a few counts as opposed to the few thousand counts seen in the UL channel, and I guess 1 OSEM count ~ 1 um). All this supports the hypothesis that the problem is electrical and not mechanical (i.e. I think we can rule out the Acromag sending a glitchy signal to the coil and kicking the optic). The watchdog itself gets tripped because the tripping condition is the RMS of the shadow sensor outputs, which presumably exceeds the set threshold when UL glitches by a few thousand counts.
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Attachment 1: glitches.png
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14185
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Mon Aug 27 09:14:45 2018 |
Steve | Update | PEM | small earth quakes |
Small earth quakes and suspensions. Which one is the most free and most sensitive: ITMX
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Attachment 1: small_EQs_vs_SUSs.png
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14186
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Tue Aug 28 15:29:19 2018 |
Steve | Frogs | PEM | Rat is cut |
The rat is cut by mechanical trap and it was removed from ITMX south west location.
A nagy kover patkanyt a fogo elkapta es megolte. |
Attachment 1: rat#2.png.png
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14188
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Wed Aug 29 09:20:27 2018 |
Steve | Update | SUS | local 4.4M earth quake |
All suspension tripped. Their damping restored. The MC is locked.
ITMX-UL & side magnets are stuck.
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Attachment 1: 4.4_La_Verne.png
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Attachment 2: 3.4_&_4.4M_EQ.png
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14189
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Wed Aug 29 09:56:00 2018 |
Steve | Update | VAC | Maglev controller needs service |
TP-1 Osaka maglev controller [ model TCO10M, ser V3F04J07 ] needs maintenance. Alarm led on indicating that we need Lv2 service.
The turbo and the controller are in good working order.
*****************************
Hi Steve,
Our maintenance level 2 service price is $...... It consists of a complete disassembly of the controller for internal cleaning of all ICB’s, replacement of all main board capacitors, replacement of all internal cooling units, ROM battery replacement, re-assembly, and mandatory final testing to make sure it meets our factory specifications. Turnaround time is approximately 3 weeks.
RMA 5686 has been assigned to Caltech’s returning TC010M controller. Attached please find our RMA forms. Complete and return them to us via email, along with your PO, prior to shipping the cont
Best regards,
Pedro Gutierrez
Osaka Vacuum USA, Inc.
510-770-0100 x 109
*************************************************
our TP-1 TG390MCAB is 9 years old. What is the life expectancy of this turbo?
The Osaka maglev turbopumps are designed with a 100,000 hours(or ~ 10 operating years) life span but as you know most of our end-users are
running their Osaka maglev turbopumps in excess of 10+, 15+ years continuously. The 100,000 hours design value is based upon the AL material being rotated at
the given speed. But the design fudge factor have somehow elongated the practical life span.
We should have the cost of new maglev & controller in next year budget. I put the quote into the wiki.
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14191
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Wed Aug 29 14:51:05 2018 |
Steve | Update | General | tomorrow morning |
Electrician is coming to fix one of the fluorenent light fixture holder in the east arm tomorrow morning at 8am. He will be out by 9am.
The job did not get done. There was no scaffolding or ladder to reach troubled areas. |
14199
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Tue Sep 18 14:02:37 2018 |
Steve | Update | safety | safety training |
Yuki Miyazaki received 40m specific basic safety training.
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14201
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Thu Sep 20 08:17:14 2018 |
Steve | Update | SUS | local 3.4M earth quake |
M3.4 Colton shake did not trip sus.
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Attachment 1: local_3.4M.png
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14217
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Wed Sep 26 10:07:16 2018 |
Steve | Update | VAC | why reboot c1vac1 |
Precondition: c1vac1 & c1vac2 all LED warning lights green [ atm3 ], the only error message is in the gauge readings NO COMM, dataviewer will plot zero [ atm1 ], valves are operational
When our vacuum gauges read " NO COMM " than our INTERLOCKS do NOT communicate either.
So V1 gate valve and PSL output shutter can not be triggered to close if the the IFO pressure goes up.
[ only CC1_HORNET_PRESSURE reading is working in this condition because it goes to a different compuer ]
Quote: |
[steve, gautam]
Following the procedure in this elog, we effected a reset of the vacuum slow machines. Usually, I just turn the key on these crates to do a power cycle, but Steve pointed out that for the vacuum machines, we should only push the "reset" button.
While TP1 was spun down, we took the opportunity to replace the TP1 controller with a spare unit the company has sent us for use while our unit is sent to them for maintenance. The procedure was in principle simple (I only list the additional ones, for the various valve closures, see the slow machine reset procedure elog):
- Turn power off using switch on rear.
- Remove 4 connecting cables on the back.
- Switch controllers.
- Reconnect 4 cables on the back panel.
- Turn power back on using switch on rear.
However, we were foiled by a Philips screw on the DB37 connector labelled "MAG BRG", which had all its head worn out. We had to make a cut in this screw using a saw blade, and use a "-" screwdriver to get this troublesome screw out. Steve suspects this is a metric gauge screw, and will request the company to send us a new one, we will replace it when re-installing the maintaiend controller.
Attachments #1 and #2 show the Vacuum MEDM screen before and after the reboot respectively - evidently, the fields that were reading "NO COMM" now read numbers. Attachment #3 shows the main volume pressure during this work.
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The problem will be revisited on Monday.
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Attachment 1: NOcomm.png
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Attachment 2: Reboot_&_sawp.png
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Attachment 3: c1vac1&2_.jpg
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Thu Oct 4 08:25:50 2018 |
Steve | Update | VAC | rga scan pd81 at day 78 |
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Attachment 1: pd81d78.png
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14244
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Fri Oct 12 08:27:05 2018 |
Steve | Update | VAC | drypump |
Gautam and Steve,
Our TP3 drypump seal is at 360 mT [0.25A load on small turbo] after one year. We tried to swap in old spare drypump with new tip seal. It was blowing it's fuse, so we could not do it.
Noisy aux drypump turned on and opened to TP3 foreline [ two drypumps are in the foreline now ] The pressure is 48 mT and 0.17A load on small turbo. |
Attachment 1: forepump.png
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14247
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Fri Oct 12 17:37:03 2018 |
Steve | Update | VAC | pressure gauge choices |
We want to measure the pressure gradient in the 40m IFO
Our old MKS cold cathodes are out of order. The existing working gauge at the pumpspool is InstruTech CCM501
The plan is to purchase 3 new gauges for ETMY, BS and MC2 location.
Basic cold cathode or Bayard-Alpert Pirani
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14256
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Mon Oct 15 13:59:42 2018 |
Steve | Update | VAC | drypump replaced |
Steve & Bob,
Bob removed the head cover from the housing to inspect the condition of the the tip seal. The tip seal was fine but the viton cover seal had a bad hump. This misaligned the tip seal and it did not allow it to rotate.
It was repositioned an carefully tithened. It worked. It's starting current transiant measured 28 A and operational mode 3.5 A
This load is normal with an old pump. See the brand new DIP7 drypump as spare was 25 A at start and 3.1 A in operational mode. It is amazing how much punishment a slow blow ceramic 10A fuse can take [ 0215010.HXP ]
In the future one should measure the current pick up [ transient <100ms ] after the the seal change with Fluke 330 Series Current Clamp
It was swapped in and the foreline pressure dropped to 24 mTorr after 4 hours. It is very good. TP3 rotational drive current 0.15 A at 50K rpm 24C
Quote: |
Gautam and Steve,
Our TP3 drypump seal is at 360 mT [0.25A load on small turbo] after one year. We tried to swap in old spare drypump with new tip seal. It was blowing it's fuse, so we could not do it.
Noisy aux drypump turned on and opened to TP3 foreline [ two drypumps are in the foreline now ] The pressure is 48 mT and 0.17A load on small turbo.
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Attachment 1: drypump_swap.png
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14259
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Wed Oct 17 09:31:24 2018 |
Steve | Update | PSL | main laser off |
The main laser went off when PSL doors were opened-closed. It was turned back on and the PSL is locked. |
Attachment 1: Inno2wFlipped_off.png
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14262
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Mon Oct 22 15:19:05 2018 |
Steve | Update | VAC | Maglev controller serviced |
Gautam & Steve,
Our controller is back with Osaka maintenace completed. We swapped it in this morning.
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TP-1 Osaka maglev controller [ model TCO10M, ser V3F04J07 ] needs maintenance. Alarm led on indicating that we need Lv2 service.
The turbo and the controller are in good working order.
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Hi Steve,
Our maintenance level 2 service price is $...... It consists of a complete disassembly of the controller for internal cleaning of all ICB’s, replacement of all main board capacitors, replacement of all internal cooling units, ROM battery replacement, re-assembly, and mandatory final testing to make sure it meets our factory specifications. Turnaround time is approximately 3 weeks.
RMA 5686 has been assigned to Caltech’s returning TC010M controller. Attached please find our RMA forms. Complete and return them to us via email, along with your PO, prior to shipping the cont
Best regards,
Pedro Gutierrez
Osaka Vacuum USA, Inc.
510-770-0100 x 109
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our TP-1 TG390MCAB is 9 years old. What is the life expectancy of this turbo?
The Osaka maglev turbopumps are designed with a 100,000 hours(or ~ 10 operating years) life span but as you know most of our end-users are
running their Osaka maglev turbopumps in excess of 10+, 15+ years continuously. The 100,000 hours design value is based upon the AL material being rotated at
the given speed. But the design fudge factor have somehow elongated the practical life span.
We should have the cost of new maglev & controller in next year budget. I put the quote into the wiki.
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Attachment 1: our_controller_is_back.png
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Thu Oct 25 16:17:14 2018 |
Steve | Update | safety | safety training |
Chub Osthelder received 40m specific basic safety traning today. |