sPHENIX EMCal discussion

[woody <woody AT bnl.gov>]

Hi Vera,
    We did indeed change the pressure in the Cherenkovs in order to optimize their efficiency and e/h separation at different energies. If you'd like to learn a bit more about how they work, there is a description about them on the FTFB web page: http://ftbf.fnal.gov/cerenkov-detectors/ 

Cheers,
Craig

On 5/14/2016 3:32 PM, Loggins, Vera wrote:

Hi all,

I have plotted the Cherenkov distributions for the C1, C2 inner, and C2 outer variables.  This was for the Energy Scan (UIUC centered, Tower 21, 350k Events) and Production_0417_CEMC_MIP_set2_v3.  The run numbers are the following:

run 2298 (1GeV), 2268 (2GeV), 2260(3GeV), 2256(4GeV),2247(6GeV),2295(8GeV),2276(12GeV),2280(16GeV).  The link in the Wiki is:

https://wiki.bnl.gov/sPHENIX/index.php/T-1044/EMCal_good_run_note#Energy_Scan_.28UIUC_centered.2C_Tower_21.2C_350k_Events.29

I had a quick question on the change in the overall distributions of C1 and C2 inner and C2 outer.  It appears that the distributions change for C1, at 1,8,12,and 16 GeV compared tot he other energies.  It seems that the pressure is changed.  Also the same is true for C2 inner at 2,3, and 4 GeV, and also for C2 outer at 1,8,12,and 16 GeV.  Any help on understanding this would be appreciated.

Cheers,

Vera

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