From: Frank Geurts (geurts_at_rice.edu)
Date: Sun Jan 19 2003 - 12:54:51 EST
> ----- action items:
>
> FG - please try to work your HVSys magic. are any of those missing
> cells recoverable somehow?
5 dead cells is hard to believe unless it is 4(FEE)+1HV ... i can see
that one HVcell is dead (we knew that). But, there a few other cells
that -like last year- have funky readbacks but typically in a few 100V
around the set voltage.
i don't see hvmon running ... it would help if that one is started right
after the cells are switched on.
>
> FG - i'm hoping frank can tell me the tofp HV tripped last night...
> that is the easist explanation for why there's no data there...
tofr tripped at 10h this morning (beam dump) and is ramping up again. No
trips happened last night.
>
> ALL - we need to consider A. a higher TOFr HV current threshold
> for now or B. the re-ramping functionality in the caen control code
> i asked about a few days ago....
>
> FG - we need a final procedure a.s.a.p. for tofr HV ON/OFF so that
> people other than frank are able to check the HV status and repower
> this if necessary.
like i told you, i am working on it hoping to solve the intermittent
communication problems. Feel free to take a look at what we have if
tofpdaq:~geurts/HSCAENETLib-1-3 and ~geurts/CAENHVWrapper_2_8
-frank
ps. according to the e-logbook TOF has daq problems ... i am working my
way through the log files ... David knows that TOF can be removed any
time it causes problems. More on this later ...
>
> WJL - contact slow controls people and get pvpd default hv settings
> back in place.
> i propose the pp gain set, which to remind you is a gain factor
> of 8 higher than the so-called set0 (john's original set) based on
> john's V**4.64 scaling law....
> 1 1800.
> 2 1927.
> 3 2012.
> 4 1764.
> 5 2301. -> reduced to 2298 so SC can handle this value.
> 6 1886.
> it really is a shame we can't get higher than 2300V w/ that CTB 1440!!
>
>
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