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HPS-SOFTWARE  November 2014

HPS-SOFTWARE November 2014

Subject:

Re: ECAL LED run?

From:

Nathan Baltzell <[log in to unmask]>

Reply-To:

Software for the Heavy Photon Search Experiment <[log in to unmask]>

Date:

Wed, 26 Nov 2014 14:17:37 -0500

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (135 lines)

Hi Norman,

I think the scintillators are only a bit narrower than the crystals are long, but I
donít remember the numbers.  You can get an idea from the photo on page 2:

https://confluence.slac.stanford.edu/download/attachments/181544462/CosmicUpdateNov12.pdf?version=1&modificationDate=1415830564000&api=v2

Our initial setup did have two thinner (in z) scintillators, but we were not convinced
either of their PMTs were functioning correctly.  It may be possible in December to
revisit that, or maybe you know where to get a free working counter:)

Your option #2 would be possible, although itís not obvious to me how much we
gain from that, since I think our biggest problem is low rates.

-Nathan


On Nov 26, 2014, at 9:39, Graf, Norman A. <[log in to unmask]> wrote:

> Hello Nathan,
> My understanding is that the scintillators cover the full area of the calorimeter. The segmenation
> of the crystals in x-y provide some information about the phi angle, but I don't believe there is any
> information on theta. Is there any way to get some additional scintillators offset in z to provide 
> some rudimentary information on theta?  Either some new, thinner (in z) paddles on top and 
> bottom:
> 
> 
> 1.)
>                                \
>                                  \ 
>                                    \
>                          =======                           <- possible new (theta) scintillator
>                          ==================   <- existing scintillator
>                                          \
>                          ------------------------------
>                          |                 \                  |    < - ECal crystal
>                           ------------------------------
>                                                 \
>                          ===================  <- existing scintillator
>                                                      ======  <- possible new scintillator
>                                                        \
>                           -------------------------------------------------------->   z axis
> 
> Or to take some data with the existing scintillators offset in z?
> 
> 2.)
>                                \
>                                  \ 
>                                    \
> 
>        ================   <- existing scintillator - z
>                                          \
>                          ------------------------------
>                          |                 \                  |    < - ECal crystal
>                           ------------------------------
>                                                 \
>                                             ===================  <- existing scintillator +z
> 
>                                                        \
>                           -------------------------------------------------------->   z axis
> 
> 
> I hope the ASCII art survives.
> Norman
> ________________________________________
> From: [log in to unmask] <[log in to unmask]> on behalf of Nathan Baltzell <[log in to unmask]>
> Sent: Wednesday, November 26, 2014 6:07 AM
> To: Andrea Celentano
> Cc: McCormick, Jeremy I.; hps-software
> Subject: Re: ECAL LED run?
> 
> Hi Andrea,
> 
> Sounds good, see you next week.
> We can take some LED data in integral mode then if not today.
> 
> Plan is to run cosmics in mode 3 (reports integral and time) all Thanksgiving
> break after some final testing today.
> 
> Sergey is still working on reading out mode 7 (high resolution timing and also
> reports an event-by-event pedestal and pulse amplitude in addition to integral).
> 
> -Nathan
> 
> 
> On Nov 26, 2014, at 2:27, Andrea Celentano <[log in to unmask]> wrote:
> 
>> Hi,
>> this is just to say that next week I'll be at JLab, and I can help in doing LED characterization.
>> 
>> Is there any update on the FADC running in integral mode?
>> 
>> Andrea
>> 
>> Il 11/26/2014 08:11 AM, McCormick, Jeremy I. ha scritto:
>>> Hi,
>>> 
>>> When the DAQ is operational again, would it be possible to get an ECAL run where you flash the LEDs for every crystal in order from "upper left" (in event display) across the entire row, then down to the next column and across, etc. (Or in some specified order that makes sense.)
>>> 
>>> This would be very helpful for testing purposes.
>>> 
>>> I don't know what you would need to do as far as the triggering to make separate EvioEvents out of this information, but ideally I would think 1 hit / event would make the most sense.
>>> 
>>> This would let me test, for instance, the EcalChannel mapping in the conditions database and the event display, amongst other things.
>>> 
>>> It would also provide a good set of raw events with signal well above pedestal + 3 * sigma (I'm assuming? I don't know what signal strength you get from the LEDs).
>>> 
>>> Anyways, just a thought I had. Perhaps you've done some LED runs already that might be useful?
>>> 
>>> --Jeremy
>>> 
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>> 
>> 
> 
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