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Subject: sPHENIX cold QCD topical group
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Re: [Sphenix-cold-qcd-l] Cold QCD TG meeting on Jan 21 9am
- From: "Aidala, Christine" <caidala AT bnl.gov>
- To: "sphenix-cold-qcd-l AT lists.bnl.gov" <sphenix-cold-qcd-l AT lists.bnl.gov>
- Subject: Re: [Sphenix-cold-qcd-l] Cold QCD TG meeting on Jan 21 9am
- Date: Tue, 21 Jan 2020 15:38:03 +0000
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Minutes:
John Lajoie – sPHENIX forward EMCal R&D update II ---------------------------------------------------------------------- Recall: Idea to repurpose E864 hadronic calorimeter modules for a forward EMCal. Compensating SPACAL design (lead + scintillating fibers). Cut 117 cm long original towers to 16 cm lengths, corresponding to 20 radiation lengths. Could cover 1.4 < eta < 4.0 at z = 3 m, just inside flux return wall. 5x5 light guide array developed for prototype module with SiPM photosensors currently in use for cosmic ray tests at ISU.
Now have 5 more cut blocks at ISU.
Light guides currently most expensive item. Talking to injection molding houses to avoid machining costs. Also looking into new 3D printing techniques working with resins (SLA). Additional suggestion from Edward Kistenev to look into air-core light guides, using highly reflective metal surfaces rather than relying on total internal reflection—potential side benefit would be reducing background from Cherenkov radiation produced by charged particles passing through the light guides. Air-core light guides already used in medical applications.
Building 2nd-generation prototype for sPHENIX test beam at Fermilab, April 22 – May 5. Energy and position scans, possibly multiple light guide configurations. With test beam results in hand, could submit NSF MRI at end of 2020. EIC site selection at BNL could be positive, if can make case for reusability at EIC, or negative.
Started studies of usefulness as event plane detector. EpFinder code available for use in simulations. Plot on p. 10 includes MIPs. More realistic simulation of the electronics chain and dynamic range needed to understand impact on event plane resolution.
Sasha Bazilevsky – HCal for forward charged hadron measurements – simulation studies ---------------------------------------------------------------------------------------------------------------------- Can HCal help improve charged hadron momentum resolution in region with limited tracking performance (forward)? 3 < eta < 3.5.
Note that gap between EMCal and HCal degrades cluster position resolution in HCal. Slides 7-12 include 16 cm deep EMCal and 40 cm gap before HCal.
Momentum resolution with tracking vs. HCal for single-particle charged pion simulations, full GEANT – Tracking better for 10 GeV charged pions, comparable for 20 GeV, HCal better for 40 GeV. Conclusion – Combined information from tracking and HCal helps to improve momentum resolution, getting rid of lower (in HCal) and higher (in tracking) momentum tails.
Looked at more realistic environment of PYTHIA6 e+p (20 x 250 GeV) and p+p (250 x 250 GeV). Get high-momentum tail in HCal measurements, due to multiple tracks contributing to same cluster. Here combined tracking+HCal approach subtracted lower-momentum tracks, well measured by tracking, from HCal clusters. Combined approach improves momentum resolution. Very similar resolution for e+p and p+p. Degradation of momentum resolution if add 10 cm flux return right before HCal also studied -> argument for using the forward HCal as the flux return, with no gap after EMCal. Jin pointed out that 2 cm of steel needed for mechanical support in flux return region.
Conclusion – Combined information from tracking and HCal helps to improve forward momentum resolution in all scenarios studied. For best momentum resolution should aim for as small gap between EMCal and HCal as possible, with as little uninstrumented material in front of the HCal as possible (flux return and/or mechanical support). Noted that better momentum resolution for forward tracks will also improve hadron PID.
Yuji Goto and Ralf Seidl – Forward HCal R&D ----------------------------------------------------------- Recall: Collaboration with UCLA group for STAR upgrade and EIC detector R&D (eRD1). Fe + scintillator sandwich, wavelength-shifter light collection, SiPM readout. 4.5 interaction lengths, expected energy resolution 70%/sqrt(E) (GeV). Had Fermilab test beam in April 2019, including test with sPHENIX-like configuration with different thickness steel plates between EMCal and HCal.
RIKEN, Yamagata U., Tokyo Tech, and Nihon U. submitted JSPS KAKENHI grant application in October 2019, will hear back beginning of April. Two possible levels of funding for larger- or smaller-scale detector. If successful, could be commissioned in 2023 and take physics data in 2024.
-- Christine A. Aidala Associate Professor Department of Physics, University of Michigan Fulbright U.S. Scholar 2019-20, University of Pavia, Italy
From: sPHENIX-cold-QCD-l <sphenix-cold-qcd-l-bounces AT lists.bnl.gov>
On Behalf Of Alexander Bazilevsky
Dear All, On 1/15/20 4:39 PM, Bazilevsky, Alexander wrote:
-- Alexander Bazilevsky Brookhaven National Laboratory, Bldg. 510D, 2-232 Upton, NY 11973 Tel: 631-344-3712 Email: shura AT bnl.gov ------------------------------------------------- |
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[Sphenix-cold-qcd-l] Cold QCD TG meeting on Jan 21 9am,
Bazilevsky, Alexander, 01/15/2020
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Re: [Sphenix-cold-qcd-l] Cold QCD TG meeting on Jan 21 9am,
Alexander Bazilevsky, 01/20/2020
- Re: [Sphenix-cold-qcd-l] Cold QCD TG meeting on Jan 21 9am, Aidala, Christine, 01/21/2020
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Re: [Sphenix-cold-qcd-l] Cold QCD TG meeting on Jan 21 9am,
Alexander Bazilevsky, 01/20/2020
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