From: Pawel Staszel (staszel@alf.nbi.dk)
Date: Mon Jan 20 2003 - 05:25:53 EST
Hi All, Concerning T3 problem, I saw the plots sent by Andrey. The solution is very easy. The LV on T3 is turn on only partially. There are two LV outputs for T3, and unfortunately in 90% of cases when you turn it on the voltage appears only in one output. This problem is known since ~2 years. Any way, the only way to fix it is to recycle the low voltage on T3 using BRAHMS DAQ Home Page (at section Controls choose "BFS platform (rpir4)" link). You should try as long as you don't see signals at all the T3 channels. The local BNL person familiar with the issue is Bob Scheetz. Regards Pawel. Apache wrote: > ------------------------------------------------------------ > Date: Sun Jan 19 16:16:16 2003, Shift: 08:00-16:00 > Supervisor: AM, with: > Log book#13 pages 93 - 94 > > Shift Summary: > ------------------------------------------------------------ > 1. Beam was for the most part of the shift. Backgound noise > is pretty low (Sc.15 ~ 10 kHz, Sc.16 ~ 20 kHz). > 2. Runs 7484, 7485, 7486, 7487 have been recorded. > 3. There is some problem with T3: in Supermon histogram specrtum "exists" just in first 8 wires... I sent an e-mail to Pawel with attached pics for T3, T4 amd T5 (for comparison) to ask for a solution to this. > > ------------------------------------------------------------ -- ---------------------------------------------------------------------- | Pawel Staszel | | Niels Bohr Institute Tb 8 email: staszel@nbi.dk | | Blegdamsvej 17 phone: (+45) 35 32 53 51 | | København Ø FAX: (+45) 35 32 50 16 | | Danmark | ----------------------------------------------------------------------
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