sPHENIX HCal discussion

[Edouard Kistenev <kistenev AT bnl.gov>]

I am checking what I have for those two weeks. We will test preaMPS AS SOON AS NEW POWER DISTRIBUTION IS IN PLACE.

Edward

 

On Nov 14, 2016, at 1:15 PM, Abhisek Sen <sen.abhisek AT gmail.com> wrote:

Not much for inner HCAL. There were last minute preamp gain changes for inner. So we had to redo those measurements. Before the gain changes we also took lot of cosmic runs. They were relatively consistent. After the gain changes not too many measurements to compare.

Cheers,

Abhisek 

On Mon, Nov 14, 2016 at 12:51 PM Edouard Kistenev <kistenev AT bnl.gov> wrote:

Abishek, this is interesting. You probably have repeated measurements for the same towers in HInner during those tywo weeks. Are they fully consistent.

Edward

On Nov 14, 2016, at 12:42 PM, Abhisek Sen <sen.abhisek AT gmail.com> wrote:

They are taken just before T1044. All measurements are done within first two weeks of April 2016.

Cheers,

Abhisek

On Mon, Nov 14, 2016 at 11:55 AM Edouard Kistenev <kistenev AT bnl.gov> wrote:

Thanks, Abhisek. Any chance that we have dates of the data taking.

Edward

On Nov 14, 2016, at 11:34 AM, Abhisek Sen <sen.abhisek AT gmail.com> wrote:

Hi Edward,

  Here is my log. Can you compare with these?

Cheers,

Abhisek

On Mon, Nov 14, 2016 at 11:12 AM John Lajoie <lajoie AT iastate.edu> wrote:

Hi Edward,

    Ugh - this sounds ugly.

    Since we have an HCAL meeting this week, it seems like that might be a good time to discuss this as a group?  Would it be possible for you to make a few slides with your test results to lead the discussion?

John

On 11/14/2016 9:38 AM, Edouard Kistenev wrote:

Hi, Megan, Abhisek and everyone,
just before the tiles were extracted from t1044 prototype I took few runs with self- and external- cosmic triggers in HInner and HOuter. While HOuter looks reasonably stable between run 2029 (April 11) and now (one tower is different by x2), the changes to mu-peaks in HInner are too random to explain by for example global change in applyied bias. 
All tiles are already on the desk in HB - I am sure you know how to find those which belong to specific towers and reestablish the ordering - please help - I would like to have a closer look on outliers. 
	
The first one to see is #6 (2/1) in HOuter, maybe (0/0 and 2/0) in HInner (first moved up by x1.5 second down by the same factor). 

We would also need to pay more attention to the gain of electronics - probably need someone to look into preamp gains at least in towers which changed the mu-peaks too much. It is simple - find single pixel value connecting different preamps to the same SiPM (maybe to different inputs on bad preamps if found).

			Edward 
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--

John Lajoie

Professor of Physics

Iowa State University

 

(515) 294-6952

lajoie AT iastate.edu

Contact me: john.lajoie

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