[Primex2] the problem on pair spectrometer

[lma at jlab.org]

Hi Dan,

>From electronic logbook of hallb, I found there is a comment on pi0
production run #64704:  Since run#64704, the pair spectrometer detectors'
TDCs have been moved to ROC19, slot7.
PSF 1-16 are at TDC channel 64-79,
PSF 17-32 are at TDC channel 112-127,
PSB 1-16 are at TDC channel 80-95.

I think those are about TDC channels of PS detector. I also have used one
production run to test that there is no data output from TDC channel 64-70
and TDC channel 127. Other TDC channels are good!

Did PrimEx-II have 32 counters for PS detector? What's the extra PSF 17-32
used for?

Thanks
Lingling

> Hi Lingling,
>    This is the correspondence between the physical detector positions
> and the HV GUI.
> There should be a log entry which correlates to the TDC channels. Not
> all of the detector
> slots were filled.
> -Dan
>
> On 7/24/2012 1:36 PM, lma at jlab.org wrote:
>> Hi,
>>
>>   I'm trying to do TDC alignment for pair spectrometer these days. And I
>> found that there was no data output on PS detector from id#1 to id#8 as
>> I
>> tried a few of pi0 production runs. I don't know what's wrong with this
>> problem. So, I'm wondering if anyone who knows about this could give me
>> some suggestion.
>>
>> Thanks
>> Lingling
>>
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>
>
> --
> Dan Dale
> Idaho State University
> Department of Physics and
> Idaho Accelerator Center
> dandale at iac.isu.edu
> Telephone: 208-282-3467 (physics department)
>             208-282-4057 (accelerator center)
>
>
>