sPHENIX EMCal discussion

[Edward Kistenev <kistenev AT bnl.gov>]

Hi, John,
first it is a very good idea to keep detector in place into June. With the 
amount of work left for the last two days of running omissions are probably 
unavoidable. 
Second - if Al frame will replace IHCal - please drop two large scint. panels 
in the space inside (or better  in front) of solenoid. That is as close as we 
can do now to instrumenting Al IHCal.
Finally  - the proposed full system program ends with 28 GeV/c. It is very 
unlikely that we will ever have one more opportunity to bring the system in 
its current state to the beam again (IHCal will be Al based) so this is 
probably the last opportunity to make full system scan extending to highest 
momentum available at FTBF. I suggest to add 40, 60, 80, 100, 120 GeV 
positive (may switch from -28 to +28 first). The real problem with running at 
such a high momenta is saturating preamps. To avoid loosing time - I would 
suggest to simply drop bias everywhere for 1V before proposed change from -28 
to +28 (or make two runs at +28 with nominal and reduced bias).
                                        Edward
PS. 200k per energy will be sufficient - we are not looking for 
discrimination power above 30GeV/c. 

On May 3, 2018, at 7:26 AM, Craig Woody <woody AT bnl.gov> wrote:

Hi John,
 This sounds like a good run plan to me. I think the energy scan with the 
combined detector is the most important thing, and if we can get that for 
both the instrumented and the Al Inner HCAL, that would be ideal. However, I 
would also strongly encourage us to get enough data in both of those 
configurations to measure our e/h rejection (which would be the enhanced 
statistics 4 and 8 GeV running that Jin was suggesting). This may be even 
more important with the Al IHCAL, since in that configuration, we won't have 
the instrumented IHCAL to back us up for e/h rejection. If it comes down to 
having to choose one energy or another due to time, I would emphasize the 4 
GeV running since this is the nominal energy for the upsilon. Hopefully 
you're coming down the home stretch out there. This has been a heroic 
effort...

Cheers,
Craig

On 5/2/2018 11:01 PM, John Haggerty wrote:
> As I mentioned in the HCAL meeting today, we think we have finished the 
> EMCAL running we wanted on the 2c motion table, due to the efforts of Eric, 
> Martin, Songkyo Lee, and Debbie Israel, so tomorrow, we plan to move the 
> EMCAL and attach it to the steel version of the Inner HCAL.
> 
> The short summary of the data sets are:
> 
>> dual channeling position (Fri Apr 27 19:06:25 2018)
>>  - energy scan 1883-1954
>>  - position scan 1957-2043
>> sphenix+5 (Sun Apr 29 10:02:25 2018)
>>  - energy scan 2045-2167
>>  - position scan 2168-2263
>> sphenix (Tue May 1 17:57:48 2018)
>>  - position scan 2280-2360
>>  - energy scan 2361-still running
> 
> During the day, we will be sharing time with T992.  I think they will be 
> running 120 GeV protons, so we can just let it record data in 100k runs all 
> day.  About 6pm, we'll go to an energy scan HCAL+EMCAL running. Looking at 
> the 2017 data sets, it looks like 400k events at -4, -6, -8, -12, -16, -24, 
> -28 would be the minimal data set we want.  We can take about 9k 
> events/spill at energies where that is possible, so 400k is about an hour 
> at the higher energies.  If we have more time, I would guess we would be 
> best served getting higher statistics at -4 and -8, although there are 
> logistical problems getting the Cerenkov pressures to where they need to be 
> if we go high and then want to go low. Also, we did comparable positive 
> running last year; if we want that again, we might want to reduce 
> statistics to squeeze it in, but my recollection is that it wasn't 
> particularly illuminating. I suggest we try to run for 12 hours up to 
> Friday morning.
> 
> Friday morning, Todd said he could help me crane the aluminum HCAL, or 
> HCAl, into place, we could do the 120 GeV thing during the day, and again 
> at 6pm switch to a copy of the energy scan only but with aluminum in there. 
>  I can finish that up Saturday before I leave on Sunday morning if all goes 
> well.
> 
> Of course, plans can change due to various circumstances... but let us know 
> here if that sounds reasonable; the die is cast to move the EMCAL early 
> tomorrow, but we have until tomorrow night to settle on a run plan for the 
> EMCAL+HCAL energy scan.
> 

_______________________________________________
sPHENIX-EMCal-l mailing list
sPHENIX-EMCal-l AT lists.bnl.gov
https://lists.bnl.gov/mailman/listinfo/sphenix-emcal-l