Overview of SoLID Jian-ping Chen, JLab SoLID Collaboration Meeting July 9-10, 2014

SoLID: large acceptance, capable of handling high luminosity (up to~10 39 with baffle, up to ~10 37 without baffle) Ideal for precision Inclusive-DIS (PVDIS) and SIDIS experiments Good for certain exclusive reactions Five Approved Experiments: 4 “A” rating, 1 “A-” rating SIDIS: E T Polarized n (3He), 90 days E L polarized n (3He), 35 days E T polarized p (NH3), 120 days (Haiyan’s talk) PVDIS: E , LD2/LH2, 169 days, (Paul’s talk) Threshold J/  : E , LH2, 60 days, (Zein-Eddine’s talk) New Proposals: (to be reviewed tomorrow) di-hadron: parasitic to E A_y: parasitic to E /E EMC-PVDIS: new beam time 71 days on 48Ca Outstanding Physics for SoLID

SoLID- SIDIS Configuration

GEM SoLID- PVDIS Configuration

Solenoid Magnet: CLEOII magnet with modifications EM Calorimeter: particle identification, mainly electron PID SIDIS forward + Large-angle PVDIS forward only Light Gas Cherenkov: electron PID Heavy Gas Cherenkov: hadron (pion) PID, only for SIDIS Baffles: reduce background, only for PVDIS Data Acquisition: Hall D developed pipeline DAQ system Supporting Structure for magnet and detectors Infrastructure Dependencies: GEM detectors: tracking, to be provided by Chinese Collaboration MRPC: TOF for hadron (pion) PID, only for SIDIS, detector to be provided by Chinese Collaboration; readout electronics: joint. DAQ: FADC from JLab Physics Division electronics pool Magnet: disassembling/transportation, initial refurbishing by JLab Beamline: standard instrumentation operational. SoLID Base Equipment

 Standard or will be available instrumentation: SIDIS(n): T/L polarized 3He target, standard/achieved performance J/  : LH2 target, standard, modification in configuration PVDIS: Compton and Moller polarimeters required by MOLLOR and PREX  Equipment needs addition resource: PVDIS: custom high-power cryotarget, ESR2 assumed available (required by MOLLER) SIDIS(p): T polarized NH3 target Experiment-Specific Dependencies

1)Magnet: OD=3m, ID=1m, L> 3m. Bmax>1.35 T, BdL=5 T m. acceptance:  ~ 2 ,  : 8 o -24 o (SIDIS) / 22 o -35 o (PVDIS), P: 1-7 GeV resolution: dp/p ~ 2% (requires 0.1 mm tracking resolution) fringe field at the front end < 5 Gauss 2)GEM: 6 planes (SIDIS), 5 planes (PVDIS), area ~ 37 m 2, 165K ch’s, tracking eff > 90%, radial r resolution 0.1 mm high rate and high radiation environment 3)EM Calorimeter:Shashlyk sampling (leadscintillator/fiber) calorimeter 1800 preshower(2 RL) and 1800 module shower (18 RL) module area=100 cm 2, 300 scientillator pedal detector (SPD) (5mm) in front. Resolution ~ 10%/SQRT(E)  suppression 50:1 with electron eff >90% 5:1 photo suppression Radiation hard (<20% decreasing in gain after 400KRad) Trigger rate < 600 KHz (20KHz/sector) (EC+LG Cherenkov) Technical Requirements and Setup (I)

4) Light Gas Cherenkov: SIDIS: 2 m, CO2 PVDIS: 1 m, C4F8O(65%)/N2(35%) 60 mirrors, 270 PMTs, area=20 m 2 # photoelectrons > 10, eff(e) > 90%  suppression > 500:1, for P < 4 GeV (SIDIS) / 3.2 GeV (PVDIS) field up to 200 G (100 G after  -metal shielding) 5) Heavy Gas Cherenkov: 1m, 1.5 atm C4F8O 30 mirrors, 480 PMTs, area=20 m 2 (active 8.5 m 2 ) # photoelectrons > 10, eff(  ) > 90%  suppression > 10:1 for P: GeV field up to 200 G (100 G after  -metal shielding) 6) MRPC: 50 super-modules, each 3 modules, 1650 strips, 3300 ch’s area=10 m 2, time resolustion > 100 ps K suppression ~ 20:1 for P< 2.5 GeV photo suppression > 10:1 works at high rate up to 10 KHz/cm 2 Technical Requirements and Setup (II)

SIDIS: DAQ can handle ~ 100 KHz (with event size of 2.6 KB) Single “electron” trigger (defined by EC+LGC+SPD+MRPC) rates ~ 160 KHz Single “  ” trigger rates (defined by EC*+SPD+MRPC) rates ~ 14 MHz SIDIS physics rates ~ 4 KHz Accidental coincidence rate ~ 65 KHz (30 ns window) Total e  coincidence rate ~ 70 KHz Trigger: 70 KHz (coincidence) + up to 30 KHz for prescaled singles Trigger Rates for SIDIS

Conceptual design: extensive work since the full approval of SIDIS and PVDIS proposals in Strong Chinese collaboration, anticipated significant contributions Simple simulations  full simulations with realistic background Focused R&D activities to validate and finalize the conceptual design for each subsystem CLEO Magnet: JLab management finalized agreement with CLEO with DOE approval; recent CLEO site visit Several internal reviews: two brainstorming session (Physics Division) and one informal external review (dry run) 1 st draft pCDR submitted to Physics Division end of 2013 Iterations on manpower/cost. Help from Division and Project office. Used Hall D actual expenditure of similar equipment (magnet/detectors/installation) as base for manpower/cost estimation pCDR submitted to JLab management yesterday! Progress and Status

SoLID Organization Structure

Executive Board and Chair Function: The Executive Board makes decisions on scientific and organizational choices and provide high level oversight on all matter pertaining to preparation and operation of the SoLID project. The Chair of EB is the science leader and the principle contact between the collaboration and the lab management/DOE. Will provide oversight and input to the PM for the SoLID project. The chair, together with the PM, is responsible for the performance and assessment of all subsystems. Initial members are the senior spokespeople plus the Hall leader (ex- officio) and the PM (ex-officio). Paul Souder (PVDIS), Haiyan Gao (SIDIS), Zein-Eddine Meziani (J/Psi), Thia Keppel (Hall Leader, ex- officio) and Jian-ping Chen (PM, ex-officio). Paul Souder is the 1 st Chair. It is expected that the Chair position will rotate.

Project Manager Function: The Project Manager (PM) will be in charge of executing the project and report to JLab management. The collaboration will provide advice and oversight, and member of the collaboration will work under PM in various roles to execute the project. For example, all subsystems coordinators will report to PM. PM has the authority and responsibility to manage the SoLID project. Jian-ping Chen is the initial PM.

Technical Board Function: Advises the PM on all aspects of the Project, including change in cost, scope or schedule. The TB will have a group of (usually senior) collaborators who represent the full range of required technical expertise and usually a member from each subsystem is expected to be on this board. This group will be appointed by the EB. In addition, TB will include PM and also project engineers when they are appointed. TB membership can be periodically adjusted by the EB as the situation warrants. The chair of the TB will be the PM. All EB members who are not already in TB are ex-officio members. Initial members are: Jian-ping Chen (Chair), Paul Souder, Haiyan Gao, Zein-Eddine Meziani, Thia Keppel (ex-officio); Alexandre Camsonne,, Eugene Chudakov, Tom Hemmick, Xiaodong Jiang, Nilanga Liyanage, Robert Michaels, Xin Qian, Paul Reimer, Yi, Wang, Zhengguo Zhao, Xiaochao Zheng.

Overall coordination: (J.P. Chen/H. Gao/P. Souder) Calibration: (P. Souder/X, Qian) Magnet/Support/Simulations (Argonne/Duke/UVa/Umass) Magnet (JLab Engineering Div./ Argonne, P. Reimer) Detector supporting structure (Duke, H. Gao) General simulation (UVa, Z. Zhao/ Umass, S. Riordan) Neutron background simulation (Syracuse, L. Zana) Tracking (UVa/Chinese/others) GEM detectors (UVa, N.Liyanaga,/Chinese collaboration) Tracking software (JLab/O. Hansen/ Caltech, X. Qian/ Umass, S. Riordan) Gas Cherenkov(Temple/Duke/Stony Brook) Light gas Cherenkov (S. Malace/H. Gao, Z. Meziani, T. Hemmick) Heavy Gas Cherenkov (S. Malace/H. Gao Z. Meziani) EM Calorimeter (UVa/Los Alamos/W&M) Forward angle (UVa, Z.Zhao, X. Zheng/ W&M, D. Armstrong) Large angle (Los Alamos, J. Haung, X. Jiang/ Duke, M. Meziane, H. Gao) TOF with MRPC (Tsinghua, Y. Wang/Duke, H. Gao/JLab, A. Camsonne) DAQ and Trigger (JLab, A. Camsonne, Y. Qiang/Umass, R. Miskimen) Polarimeters: Compton (UVa, K. Paschke/JLab, S. Nanda) Atomic Moller (Mainz, F. Mass, K. Aulenbacher/ W&M, W. Deconinck) Targets (JLab, J.P. Chen/JLab cryotarget group, D. Meekins) Infrastructure (JLab, Hall A engineer/design team, R. Wines) More groups are joining (UIUC, J.C. Peng, MIT, S. Gilad, …) Subsystems/Responsibilities

Sub-Systems Coordinators 1)Magnet: Robin Wines/ Paul Reimer; JLab, Argonne 2)GEM-US: Nilanga Liyanange / Bernd Surrow; Uva, Temple 3)GEM-China: Zhengguo Zhao / Xiaomei Li; USTC, CIAE, Lanzhou, Tshinhua, IMP 4)Calorimeter: Xiaochao Zheng / Wouter Deconick/Chufeng Feng, Uva, W&M, Shandong (China), Argonne, Los Alamos 5)Light Gas Cherenkov: Zein-Eddine Meziani / Michael Paolone, Temple 6)Heavy Gas Cherenkov: Haiyan Gao / Mehdi Meziane, Duke 7)DAQ/Electronics: Alexandre Camsonne / Rory Miskimen/Ron Gilman, JLab, UMass, Rutgers 8)Simulation: Seamus Riordan / Zhiwen Zhao; Umass, Uva, Duke, Syracuse 9)Reconstruction and Analysis Software: Ole Hansen; JLab 10) Supporting Structure and Baffle: Robin Wines/Seamus Riordan; JLab, Argonne, Umass 11) Hall Infrastructure Modifications: Robin Wines/Ed Folts; JLab 12)Installation: Ed Folts/Robin Wines; JLab, all user groups.