sPHENIX EMCal discussion

["Huang, Jin" <jhuang AT bnl.gov>]

Hi, Everyone,

 

For people working on the test beam analysis, please use a new production file set for the 2018b analysis: /sphenix/data/data03/phnxreco/sphenix/t1044/production/production_0506/

Note only 2018b runs are analyzed in this folder.

 

It use a new EMCal tower-by-tower calibration with 2018b data, which reflex the fix of the pre-amp and three low-gain towers : https://github.com/sPHENIX-Collaboration/calibrations/pull/35  . The previous productions using the 2018a calibration will produce x2 variation in the tower gain and about x2 higher in the energy scale, when used directly onto the 2018b data.

 

For most up-to-date info: https://wiki.bnl.gov/sPHENIX/index.php/2018_calorimeter_beam_test/Data_Production_and_Analysis#Production_output

 

Cheers

 

Jin

 

 

______________________________

 

Jin HUANG

 

Associate Physicist

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________

 

 

> -----Original Message-----

> From: sPHENIX-EMCal-l [mailto:sphenix-emcal-l-bounces AT lists.bnl.gov] On

> Behalf Of John Haggerty

> Sent: Tuesday, May 8, 2018 7:10 AM

> To: sphenix-emcal-l AT lists.bnl.gov

> Cc: sphenix-hcal-l AT lists.bnl.gov

> Subject: Re: [Sphenix-emcal-l] Switching to HCAL+EMCAL combined running

>

> Here is a summary of running after I sent around the email below.

> Again, thanks to Eric, Martin, Songkyo, and Debbie for making this possible.

>

> - Eric and I had no problem getting the EMCAL onto the IHCAL

>

> - The accelerator gods did not smile down on the plan to take data with the

> steel IHCAL and then swap it out for aluminum; there were vacuum problems

> in the MI Thursday going into Friday morning that made it so we couldn't

> start the steel data until Friday morning, and by then it was too late to get

> Todd's help rigging the calorimeters around.  After talking it over with John L.,

> we decided we'd get data with the instrumented steel.

>

> - I had some parasitic running with T992 on Friday which was useful to align

> the hodoscope with the beam.  The EMCAL and HCAL were decently close to

> where we wanted them, as far as I could see.  I collected quite a bit of 120

> GeV p running for aficionados of high energy.

>

> - Friday night, we removed as much material upstream as we could.

> Unfortunately, Lorenzo could not get everything out of the beam in the 1a

> area (there were detectors with short cables with their electronics not very

> well supported), so I had to live with it.  Lorenzo estimated that the central

> part of the beamline had maybe a quarter radiation length of material, but

> he wasn't sure how large the open aperture was before the beam hit support

> plates of indeterminate thickness.  Sigh.

>

> - Forging ahead to strains of "You can't always get what you want," on Friday

> night and Saturday I did and energy scan, -4, -8, -12, -16, -20, -24, -28, -30.

>

> - Reaching the highest energy possible in the low energy pion mode, I asked

> them to switch to pion mode and go to 40 GeV.  They worked on it for an our

> or two, and could not get that mode to work (we were getting about 600

> events per spill, which I recorded, but it wasn't right, and I should have

> known that Saturday afternoon is not a good time to try something that

> hasn't been done in a while.

>

> Anyway, we got what energy scan data we could which is described in the

> elog and the run index:

>

> >

> https://www.phenix.bnl.gov/WWW/sPHENIX/haggerty/t1044/2018b/index.p

> hp

>

> On 5/2/18 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.

> >

>

>

> --

> John Haggerty

> email: haggerty AT bnl.gov

> cell: 631 741 3358

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