sPHENIX HCal discussion

[John Haggerty <haggerty AT bnl.gov>]

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.

--
John Haggerty
email: haggerty AT bnl.gov
cell: 631 741 3358