[Halld-cal] [Primexd] [Revised Logentry] FCAL HV scan

[Alexander Somov]

typo, one step in a time...




On Mon, 19 Nov 2018, Alexander Somov wrote:

>
> Hi Ashot,
>
> Yes, we do. All bases/PMT should be rather similar. We saw problems
> with setting up 1.75 kV on some modules (there was no load, the
> LED was off).
>
> This can be an indication of some problems with the base. But may
> be there is smth. different; we'll figure out, one step in time...
>
> Cheers,
>      Sasha
>
>
>
> On Mon, 19 Nov 2018, gasparan at jlab.org wrote:
>
>>
>>  Hi Sasha,
>> 
>> a very good test. It looks like we may have serious problems if we need
>> to set 1800 V range.
>> We will need to have more information (gains, electronic noise, ...)
>> before making some decision.
>> 
>> Thanks,
>> Ashot
>> 
>> 
>>> 
>>> Logentry Text:
>>> --
>>> FCAL readout: RAW mode (mode 10)
>>> 
>>> Use violet LED, 500 Hz
>>> 
>>> 1500 V
>>> ----------
>>> 
>>> Run  51604,  130 K events,  17 V
>>> Run  51605,  122 K events,  22 V
>>> 
>>> 1550 V
>>> ---------
>>> 
>>> Run 51606,  120 K events, 17 V
>>> Run 51607,  120 K events,  22 V
>>> 
>>> 1600 V
>>> ----------
>>> 
>>> Run 51608, 17 V
>>> Run 51609,  22 V
>>> 
>>> 1650 V
>>> ----------
>>> 
>>> Run 51610, 17 V
>>> Run 51611, 22 V
>>> 
>>> 1700 V
>>> ----------
>>> 
>>> Problems with setting HV on channel (22,22 ;  -8,-8)
>>> 
>>> Run 51612,  17 V
>>> Run 51613,  22 V
>>> 
>>> 
>>> 1750 V
>>> ----------
>>> 
>>> Not able to set this voltage on the following channels:
>>> Channel, Read back voltage
>>> 
>>> (1, 31) 1610 V
>>> (7, 46) 1601
>>> (13, 23) 1618
>>> (13, 47) 1651
>>> (20, 26) 1600
>>> (22, 22) 1607
>>> (25, 26) 1620
>>> (29,7) 1640
>>> (33,47) 1609
>>> (35, 37) 1630
>>> (44, 30) 1590
>>> (41, 39) 1660
>>> (44, 30) 1590
>>> (47, 38) 1625
>>> (49, 31) 1612
>>> 
>>> Run 51614,  17 V
>>> Run 51615,  22 V
>>> 
>>> 1800 V
>>> ---------
>>> 
>>> Cannot set HVs on 41 channels
>>> 
>>> Run 51616,  17 V
>>> Run 51617,  22 V
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> ---
>>> 
>>> This is a plain text email for clients that cannot display HTML.  The full
>>> logentry can be found online at
>>> https://logbooks.jlab.org/entry/3628470_______________________________________________
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>> 
>> 
>> 
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