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Comments from Physics Division

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The SOLID collaboration meeting on October 14, 2011, focused on the upgrades and future of experimental nuclear physics at Hall A, especially in the context of the 12 GeV Physics project. Key discussions included the enhancement of the beam line to accept an 11 GeV beam, maintaining existing infrastructure, and planned scientific programs. Major experiments like SBS and MOLLER were highlighted, showcasing early physics potentials in QCD imaging and scattering processes. The meeting emphasized collaboration, innovative detector technologies, and the need for careful planning to ensure successful outcomes in high-energy physics.

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Comments from Physics Division

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  1. Comments from Physics Division Rolf Ent Acting Associate Director for Experimental Nuclear Physics SOLID collaboration meeting, October 14, 2011 • 12 GeV Physics concept in Hall A: • Beam line is upgraded to accept 11 GeV beam (12 GeV Project) • Main Hall A infrastructure remains for 12 GeV operations: • Pair of HRS spectrometers • BigBite spectrometer • Calorimeters such as BigCal & DVCS-PbF2 • Cryogenic and Polarized 3He Targets • Scientific program foreseen to be a mix of base equipment experiments with upgrades from lab capital equipment budget augmented with large installation experiments • Consistent with 2007 NSAC Long Range Plan •  SBS & Moller & SOLID Thomas Jefferson National Accelerator Facility

  2. 12 GeV Experiments approved in Hall A

  3. Hall A 12-GeV Science Program Vibrant and Exciting Science Program in Hall A, with in initial years a program of base equipment interleaved with SBS experiments, followed by a high-science-profile large installation program SBS: relatively modest investment high luminosity + open geometry + GEM detectors high Q2 reach for electromagnetic form factors early physics potential for Semi-Inclusive DIS DOE/NP Science, Technical, Cost & Schedule Review ongoing Two Large Installation Experiments/Programs: MOLLER (e-e scattering) : unique window to multi-TeV scale physics complementary to high-energy physics MIE Proposal Submitted to DOE/NP September 2011 SOLID solenoidal detector with high luminosity : broad physics program on QCD imaging and standard model tests.

  4. SOLID Brainstorming Session with Experimental Physics Division on Sept. 30 Mix of relatively short/concise presentations, and then quite some questions and discussions to see where we are with the SOLID ideas in terms of the technical requirements, possible detectors, electronics, presumed sizes, channels, etc. Overview Paul Souder GEMs NilangaLiyanage Cherenkov Detectors SimonaMalace EM Calorimeters Jin Huang DAQ AlexandreCamsonne Presentations were right on the mark, concise while giving the relevant ideas, and helpful to evoke questions and discussion. The progress and convergence since early June was impressive.

  5. (from Paul Souder)

  6. SOLID – loose thoughts • Brainstorming Session with Experimental Physics Division on Sept. 30 • Some discussion/ideas following the meeting: • CLEO magnet seems magnet of choice • - to be removed from beam line Summer 2013? • PVDIS needs ~200K GEM channels (25 m2), SBS needs 110K (18 m2) • - cost driven by labor, electronics, cabling – ~5M$ total • Cherenkov costs driven by PMTs – PVDIS only e Cherenkov ~1.5M$ • -- SIDIS also p Cherenkov ~1.5M$ • radiation hard with energy resolution requirements drives Shashlyk • - relatively new detector technique  can’t scrounge • - $1-1.5K per module, PVDIS (SIDIS) needs 1,000 (1,500) • - but can/should scrounge PMTs + CAEN HV from FNAL? • fast (pipelined) electronics costs high - PVDIS ~2.5M$ • - SIDIS ~4M$ • - should share as much as possible • (SBS, Hall C/p0, Hall B/RICH, Hall D/RICH) • One option to maybe investigate further is to split functions, and mix a Chinese contribution, NSF/MRE, modest DOE/MIE, JLab capital equipment, scrounging PMTs/HV, and sharing readout systems amongst Halls (utilizing Hall multiplicity)

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