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ID Date Author Type Category Subject Text   2518   Thu Jan 23 19:23:03 2020 anchal DailyProgress FSS NFSS Boost Stage Today Koji came to the lab to help me out with the FSS and give me few tips. We made some changes to the boost      2517   Wed Jan 22 16:00:26 2020 anchal DailyProgress FSS TTFSS OLTFs with Maximum Gain Repeated these measurements with maximum possible gain values in the FSS loops.      2516   Wed Jan 22 15:20:00 2020 anchal Notes BEAT Notch improved on FSS RFPDs. Gain values increased as well. New Gain Values: South Common Gain: 24 dB , Fast Gain: 18 dB North Common Gain: 14 dB, Fast      2515   Wed Jan 22 14:16:28 2020 anchal DailyProgress FSS TTFSS OLTFs Repeated these measurements after changes to the RFPDs (Notch improved). Inferences: No      2514   Thu Jan 16 20:18:44 2020 anchal DailyProgress FSS FSS Diagnostics - SN010 (South RFPD) Notch Improved Circuit changes (Updated Schematic) I made the following changes to SN009:      2513   Thu Jan 16 11:17:15 2020 anchal DailyProgress FSS FSS Diagnostics - SN010 (South RFPD) Notch Improvement Attempt Circuit changes (Updated Schematic) I made the following changes to SN009:      2512   Tue Jan 14 18:19:33 2020 anchal DailyProgress FSS FSS Diagnostics - SN009 (North RFPD) Notch Improved! Circuit changes (Updated Schematic) I made the following changes to SN009:      2511   Tue Jan 14 13:32:16 2020 Ian MacMillan Notes FSS FSS Plant Model v2 I also designed a board for the circuit. This is based on the Zero model from the previous post.      2510   Tue Jan 14 13:30:39 2020 Ian MacMillan Notes FSS FSS Plant Model v2 I made a more advanced model of the circuit using Zero and compared them to the experimental results.      2509   Mon Jan 13 19:04:38 2020 anchal DailyProgress FSS FSS Diagnostics - SN009 (North RFPD) Notch Improvement Attempt Circuit changes (Updated Schematic) I made the following changes to SN009:      2508   Thu Jan 9 19:00:19 2020 anchal DailyProgress FSS TTFSS OLTFs I repeated this measurement to compare later after changes to RFPDs.      2507   Tue Jan 7 17:59:20 2020 anchal DailyProgress FSS NPMC TF Method: I injected excitation at FP1Test and readout at Mixer      2506   Mon Dec 30 10:33:33 2019 anchal Summary Other Summary of questions asked in December For the convenience of others, I'm summarizing the open questions I asked on elog in December. Comments on the posts,      2505   Fri Dec 20 18:08:44 2019 anchal DailyProgress FSS PZT, EOM to RIN TF Measurement Through FSS TF Measurement Method I switched on Test1 switch on RF Board to cut off RFPD input      2504   Fri Dec 20 15:00:30 2019 anchal DailyProgress FSS PZT, EOM to RIN TF Measurement I took some TF measurements, but I'm not sure if I used the right method to do this. All the resutls look essentially the      2503   Wed Dec 18 22:03:17 2019 rana DailyProgress FSS Maybe the NPRO Laser isn't bad after all Could be that either the FSS makes RIN through driving the PZT / making beam jitter FSS      2502   Wed Dec 18 18:40:32 2019 anchal DailyProgress FSS Maybe the NPRO Laser isn't bad after all Today I inserted two photodiodes, Thorlabs PDA10CS at (110,44) at dumped end of a PBS before PMC and      2501   Wed Dec 18 14:04:43 2019 anchal DailyProgress Laser South Laser Power Dropped. After the last calibration, South Laser power at Laser head determined by its internal photodiode and show as setting PWR today      2500   Tue Dec 17 18:29:58 2019 anchal DailyProgress FSS Need for ISS? If we are going to keep the same laser with busted Noise Eater, should be go in the direction of implementing the ISS?      2499   Tue Dec 17 16:55:07 2019 anchal DailyProgress FSS FSS Diagnostics - TTFSS North U7 Boost Stage Input-Output TimeSeries As suggested few group meetings ago, I took time series data at the input and output of boost stage opamp U7      2498   Mon Dec 16 09:43:56 2019 Ian MacMillan Notes FSS FSS Plant Model v2 In talks with Anchal, we have adapted our model and the transfer function fits rather well. These measurements were taken with      2497   Fri Dec 13 17:44:05 2019 anchal DailyProgress FSS FSS Diagnostics - RFPD RF Coupled Output Offset I rechecked the 20dB coupled RF output of SN009 (RFPD on north Cavity reflection) and SN010 (RFPD on south Cavity refleciton).      2496   Fri Dec 13 16:24:02 2019 anchal DailyProgress FSS FSS Diagnostics - RFPD Circuit Latest Available Photos I found the latest available photos for the Cavity Reflection RFPD circuits.      2495   Thu Dec 12 19:15:55 2019 anchal DailyProgress FSS FSS Diagnostics - Beatnote Spectrum wrt Laser Power and Modulation Index I took beatnote spectrums in the current modulation index (was set to around 0.3 earlier). Then I took spectrum after attenuating the      2494   Thu Dec 12 19:05:33 2019 rana Notes FSS FSS Plant Model v2 please overlay all the plots and also include the ideal TFs - its hard to understand anything without the comparisons      2493   Thu Dec 12 11:54:11 2019 Ian MacMillan Notes FSS FSS Plant Model v2 Testing the circuit using SRmeasure and AGmeasure, I got more accurate readings of the transfer functions. The PZT path TF      2492   Tue Dec 10 17:03:41 2019 anchal DailyProgress Laser Laser Settings back to defaults I put laser settings on both North and South Cavities back to default. From this point onwards, all settings about the lasers      2491   Tue Dec 10 11:57:58 2019 Ian MacMillan Notes FSS FSS Plant Model v2   First, off I forgot a resistor on the previous diagram so here is the fixed      2490   Mon Dec 9 19:54:44 2019 anchal DailyProgress FSS FSS Diagnostics - How much distortion affects the functioning of PDH? I'm trying to think hard with my small brain how the distortion would affect the PDH functioning and inject noise in the frequency      2489   Mon Dec 9 18:08:13 2019 Ian MacMillan Notes FSS FSS Plant Model v2 I tested the circuit and got the attached results. The PZT transfer function looks reasonable. some adjustments to the values      2488   Thu Dec 5 18:25:11 2019 rana DailyProgress FSS Free running laser frequency noise spectrum when the NPRO crystal is oscillatin        2487   Wed Dec 4 18:11:09 2019 anchal DailyProgress FSS Free running laser frequency noise spectrum I took a spectrum of PMC error signal when the FSS loop is not closed. This should provide a rough estimate of the free running laser      2486   Wed Dec 4 17:09:44 2019 anchal DailyProgress TempCtrl Increased range of out-of-loop temperature sensor This has happened few times now that acromag channel for the can heater driver stopped updating according to the PID script and      2485   Tue Dec 3 17:27:54 2019 Ian MacMillan Notes FSS FSS Plant Model v2 The new circuit design has been built and is shown below. I tested the transfer functions and the PZT path looks good by eye but the      2484   Wed Nov 27 16:31:20 2019 rana DailyProgress FSS FSS Diagnostics - Quick HF OLTF of NFSS I doubt it. When feedback loops be noisy and busted,      2483   Wed Nov 27 15:17:51 2019 anchal DailyProgress FSS FSS Diagnostics - Quick HF OLTF of NFSS I quickly took a high-frequency Open Loop Gain measurement of NFSS loop at 10 dB COM Gain and 10 dB FAST gain, using the same      2482   Wed Nov 27 13:59:24 2019 anchal DailyProgress FSS FSS Diagnostics - TTFSS TP1 TimeSeries I took time-series data at TP1 on NFSS. This is just after the elliptical filter which is after the      2481   Tue Nov 19 18:51:02 2019 anchal DailyProgress FSS FSS Diagnostics - Second-order Distortion Calculation I did some theoretical calculations using the datasheet value of second harmonic SFDR      2480   Thu Nov 14 12:19:32 2019 rana DailyProgress FSS FSS Diagnostics - Two Tone Third Order Intermodulation Test cool - how bout use this new no-how to estimate the excess in FSS?      2479   Tue Nov 12 18:36:59 2019 anchal DailyProgress FSS FSS Diagnostics - Two Tone Third Order Intermodulation Test In line with industrial practices, I did two tone third order intermodulation test today on the FSS RFPDs. This test was inspired      2478   Tue Nov 12 11:39:48 2019 anchal DailyProgress FSS FSS Diagnostics - RFPD RF Ouput under inspection I calculated these values by integrating in the 8 MHz neighborhood around the marked harmonic peak, the power spectral density      2477   Mon Nov 11 20:42:49 2019 anchal DailyProgress FSS FSS Diagnostics - Two Tone Test Method RFPD of the FSS loops were tested through there Test input ports (Updated      2476   Sat Nov 9 19:28:36 2019 anchal DailyProgress FSS FSS Diagnostics - Loop nonlinearity Test Method I've wrote this script, nonlinTF.py which controls a Marconi 2023A and SR785      2475   Sat Nov 9 13:46:08 2019 shruti Misc Electronics Equipment Borrowed I've borrowed a Marconi VCO, a mini-circuits LPF and mixer from the CTN lab for use at the WB EEshop.      2474   Tue Nov 5 18:37:59 2019 anchal DailyProgress FSS FSS Diagnostics - TTFSS Testpoint Spectrum Data Measurement method All measurements were taken withAG4395A for high frequency and SR785 for low frequency and      2473   Mon Nov 4 20:13:44 2019 anchal Notes BEAT Quick note: FSS Loop Gain Changes South Common Gain: 24 dB! , Fast Gain: 14 dB North Common Gain: 10 dB, Fast      2472   Mon Nov 4 15:03:26 2019 anchal DailyProgress FSS Raised North TTFSS; Fixed the boxes. I raised the North TTFSS box by 6 inches to make way for working on South box and to reduce the congestion of connectors in      2471   Mon Nov 4 12:15:01 2019 anchal Notes PMC Changing the autolocking method Trying gain sliding like 40m Rana told me that in 40m, the PMCs are autolocked by reducing the gain of the loop and changing      2470   Fri Nov 1 17:54:47 2019 anchal DailyProgress FSS FSS Diagnostics - RFPD RF Ouput under inspection First step in FSS Diagnostics was to see RF output from the RFPDs in FSS when they are locked. I ran some extensive measurements      2469   Wed Oct 30 18:35:31 2019 anchal Notes PMC Issue closed It turns out I did not have a full understanding of the problem and it was not really a problem. The blanking (pin 4) on U5A AD602 doesn't

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