sPHENIX is a new detector at RHIC.

[Murad Sarsour <murad.sarsour AT gmail.com>]

Dear Jin and all,


>
>
> Page 5:
>
> Jin: sPHENIX Hcal is built to be rotational symmetric around the origin by
> rotation of 1.125 degrees. The fact that the thickness VS phi do not repeat
> periodically indicates inconsistency in definition of origin or layout of
> the plates.
>
> Action Item [Murad, Jin, Chris]: follow up with Richie to fix it. (More
> information on HCal drawing was fetch from Richie and attached to agenda.)
>
Unfortunately, my connection wasn't very clear during the meeting
yesterday. So let me say what I thought about the cause for asymmetry
in the thickness vs phi. If you look at Richie's design (see attached
..B.pdf file), the plot on the upper right hand side which shows the
outer HCal prototype2 w.r.t. zero. You can see clearly that the tilts
/angles (w.r.t zero) are not the same for all titles and it's not a
slice of the //main sPHENIX design. This what produces the asymmetry
that you see in thickness vs. phi. The tiles for the inner HCal don't
have as much difference in the tilt w.r.t. zero (see attached ..C.pdf
file) and that's why we don't have large asymmetry in the thickness vs
phi.

Best regards,
Murad


>
>
>
> Additional post meeting info:
>
> latest engineering design from Richie attached to agenda
> (https://indico.bnl.gov/getFile.py/access?subContId=0&contribId=1&resId=0&materialId=slides&confId=1664
> ) showing that
>
> 1.       Inner Hcal and outer Hcal share the same origin (precise to
> sub-mms). This point should be used as the origin of Geantino scan.
>
> 2.       Five rays of reference Green Lines extend from origin to the outer
> Hcal with spacing of 1.125 degrees. If look closely on the outer Hcal, each
> green ray pass through exactly the same material at the same angle on the
> outer Hcal (local rotational symmetry of 1.125 degree)
>
> 3.       Therefore, we would expect material scan from Geant4 simulation
> show the same symmetry when rotated by 1.125 degree
>
>

>
>
>
>
> Page 8:
>
> Murad: the sampling fraction was produced by muon simulations
>
>
>
> Sarah: center of the sampling fraction distribution is off on fit. Suggest
> use larger portion of the lower SF in the fit.
>
>
>
> Jin: why there is a 5% energy dependence?
>
> Murad: it appears to be small variation. To be understood
>
>
>
> Jin: why there is a spike at sampling fraction = 0?
>
> Murad:  could due to the thrown particle outside the active area of the
> scintillator. But need double checks.
>
> Plan: cut on acceptance and see whether it goes away.
>
>
>
> Action Item [Murad]: follow up with the above three items.
>
>
>
>
>
> Slides 10: energy response
>
> Sarah: how does the width comparing to prototype1?
>
> Murad: see next slides for resolution
>
>
>
> Slides 11: resolution VS E
>
> Murad still early study as we are trying to understand details of
> simulation.
>
>
>
> Summary slides:
>
> Jin: please send the RCF setup and macro, so I could add the EMCal in
> parallel.
>
> Action Item [Murad]: agree
>
>
>
>
>
> ______________________________
>
>
>
> Jin HUANG
>
>
>
> Brookhaven National Laboratory
>
> Physics Department, Bldg 510 C
>
> Upton, NY 11973-5000
>
>
>
> Office: 631-344-5898
>
> Cell:   757-604-9946
>
> ______________________________
>
>
>
>
>
>> -----Original Message-----
>
>> From: Huang, Jin
>
>> Sent: Tuesday, January 19, 2016 8:05 AM
>
>> To: 'sphenix-l AT lists.bnl.gov' <sphenix-l AT lists.bnl.gov>;
>> 'sphenix-software-
>
>> l AT lists.bnl.gov' <sphenix-software-l AT lists.bnl.gov>
>
>> Subject: [reminder] sPHENIX simulation and software meeting, today 1PM
>
>> EST @ 2-219
>
>>
>
>> Dear All,
>
>>
>
>> This is a reminder that we will have our regular sPHENIX simulation and
>
>> software meeting, Tue Jan 19th, 1PM EST @ 2-219.
>
>>
>
>> Currently on the agenda: following software update, Murad will discuss
>
>> simulation preparation for the Hcal test beam. More contributions will be
>
>> welcomed too.
>
>>
>
>> The agenda page is at
>
>> https://indico.bnl.gov/conferenceDisplay.py?confId=1664 , for which the
>
>> common modification password is "1008"
>
>> •            For residents at BNL, we will meet at the 2-219 conference
>> room
>
>> •            To join the Meeting via phone bridge:
>
>> https://bluejeans.com/619960505
>
>> •            To join via Phone:
>
>> 1) Dial:
>
>>         +1.408.740.7256
>
>>         +1.888.240.2560(US Toll Free)
>
>>         +1.408.317.9253(Alternate number)
>
>>         (see all numbers - http://bluejeans.com/numbers)
>
>> 2) Enter Conference ID: 619960505
>
>>
>
>>
>
>> Cheers,
>
>>
>
>> Jin
>
>>
>
>> ______________________________
>
>>
>
>> Jin HUANG
>
>>
>
>> Brookhaven National Laboratory
>
>> Physics Department, Bldg 510 C
>
>> Upton, NY 11973-5000
>
>>
>
>> Office: 631-344-5898
>
>> Cell:   757-604-9946
>
>> ______________________________
>
>
> _______________________________________________
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>

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