sPHENIX HCal discussion

[Abhisek Sen <sen.abhisek AT gmail.com>]

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 #7 (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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