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40m Log |
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Tue Jul 16 16:00:01 2019, gautam, Update, CDS, c1iscaux Supermicro setup
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Wed Jul 17 21:22:41 2019, gautam, Update, CDS, CM board Latch Enable subtlety
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Sun Jul 21 12:55:38 2019, gautam, Update, CDS, CM board Latch Enable test script 
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Fri Aug 9 08:59:04 2019, gautam, Update, CDS, Prep for install of c1iscaux
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Sun Aug 11 11:47:42 2019, gautam, Update, CDS, Bench test of c1iscaux
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Mon Aug 12 17:36:04 2019, gautam, Update, CDS, More bench test of c1iscaux
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Mon Aug 12 21:25:19 2019, Koji, Update, CDS, More bench test of c1iscaux
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Tue Aug 13 08:07:09 2019, gautam, Update, CDS, P1--->P2
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Tue Aug 13 14:36:17 2019, gautam, Update, CDS, P1--->P2
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Fri Aug 16 16:40:04 2019, gautam, Update, CDS, 1Y3 work  
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Sat Aug 17 16:49:23 2019, gautam, Update, CDS, More 1Y3 work   
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Mon Aug 19 14:36:21 2019, gautam, Update, CDS, c1iscaux remaining work
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Tue Aug 20 19:05:24 2019, Koji, Update, CDS, MC1 (and MC3) troubleshoot 
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Thu Aug 22 12:54:06 2019, Koji, Update, CDS, MC1 glitch removed (for now) and IMC locking recovered 7x
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Thu Aug 22 20:56:51 2019, Koji, Update, CDS, MC1 glitch removed (for now) and IMC locking recovered
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Fri Aug 23 18:46:17 2019, Jon, Update, CDS, c1iscaux remaining work
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Sun Aug 25 14:18:08 2019, gautam, Update, CDS, c1iscaux remaining work
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Thu Jul 18 10:46:04 2019, gautam, Update, CDS, Database files made
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Thu Jul 18 19:58:56 2019, gautam, Update, CDS, Work on Acromag chassis  
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Fri Jul 19 19:44:03 2019, gautam, Update, CDS, Database file test
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Message ID: 14837
Entry time: Fri Aug 9 08:59:04 2019
In reply to: 14790
Reply to this: 14840
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Author: |
gautam |
Type: |
Update |
Category: |
CDS |
Subject: |
Prep for install of c1iscaux |
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[chub, gautam]
We scoped out the 1Y3 rack this morning to figure out what needs to be done hardware wise. We did not think about how to power the Acromag crate - the LSC rack electronics are all powered by linear supplies and not Sorensens, and the linear supplies are operating at pretty close to their maximum current-drive. The Acromag box draws ~3A of current from the 20 V supply, not sure what the current draw will be from the 15 V supply. Options:
- Since there are sorensens in 1Y2 and 1Y1, do we really care about installing another pair of switching supplies (+20 V DC and +15 V DC) in 1Y3?
- Contingent on us having two spare Sorensens available in the lab. Chub has already located one.
- Use the Sorensens installed already in 1Y1.
- Probably the easiest and fastest option.
- +15 V already available, we'd have to install a +20 V one (or if the +/-5 V or +12 V is unused, reconfigure for +20 V DC).
- Can argue that "this doesn't make the situation any worse than it already is"
- Will require the running of some long (~3 m) long cabling to bring the DC power to 1Y3 where it is required.
- Get new linear supplies, and hook them up in parallel with the existing.
- Need to wait for new linear supply to arrive
- Probably expensive
- Questionable benefit to electronics noise given the uncharacterized RF pickup situation at 1Y2
I'm going with option #2 unless anyone has strong objections. |