CLAS12 baseline equipment and status of the project

1. CLAS12 baseline equipment and status of the project Latifa Elouadrhiri Hall B 12GeV Upgrade Project Manager International Workshop Probing Strangeness in Hard Processes INFN - Laboratori Nazionali di Frascati October 18-21, 2010

2. Outline • Introduction • Project Status • Construction Highlights • Summary

3. JEFFERSON LAB TODAY B C A >1200 active member international user community engaged in exploring quark-gluon structure of matter. Newport News, VA Superconducting electron accelerator provides 100% duty factor beams of unprecedented quality, with high polarization at energies up to 6 GeV. CEBAF’s delivery of beam with unique properties to three experimental halls simultaneously. Each hall offers complementary capabilities.

4. Jefferson Lab Today A C B Hall B Hall A Two high-resolution 4 GeV spectrometers Large acceptance spectrometer electron/photon beams Hall C 7 GeV spectrometer, 1.8 GeV spectrometer, large installation experiments

5. Upgrade magnets and power supplies CHL-2 new Hall 12 6 GeV CEBAF 11 • Upgrade is designed • to build on existing facility: • vast majority of accelerator • and experimental equipment • have continued use. Two 0.6 GeV linacs 1.1 Enhanced capabilities in existing Halls Maintain capability to deliver lower pass beam energies: 2.2, 4.4, 6.6….

6. Detector Performance Requirements

7. New Capabilities In Halls A, B, & C, & New Hall D GlueX 9 GeV tagged polarized photons and a 4 hermetic detector Super High Momentum Spectrometer (SHMS) C D Exploring origin of confinement by studying exotic mesons. Precision determination of valence quark properties. CLAS upgraded to higher (1035) luminosity and coverage High Resolution Spectrometer (HRS) Pair, and large installation experiments A B SRC, FFs, Hypernuclear, Standard Model studies (PV, Moller) Nucleon structure via generalized parton distributions.

8. 12 GeV CONSTRUCTION TPC Construction Total Project Cost (TPC) = $310M Total Equipment Cost (TEC) =$287.5M

9. Experimental Equipment Construction Cost Experimental Equipment/Physics Cost Experimental Systems Experimental Systems by Sub-system

10. DOE CRITICAL DECISION SCHEDULE ~2 years into 5.5 year construction period CD-4 split to ease transition into operations phase

11. 12 GeV Upgrade Project Schedule • Two short parasitic installation periods in FY10 • 6-month installation • May-Oct 2011 • 12-month installation • May 2012-May 2013 • Hall D commissioning start • April 2014 • Hall A commissioning start October 2013 • Halls B & C commissioning start October 2014 • Project Completion June 2015

12. Hall B 12GeV Upgrade Overview Hall Bcurrently houses the CEBAF Large Acceptance Spectrometer (CLAS) L=1034 cm-2s-1 CLAS will be replaced by CLAS12 CLAS12is designed to operate with an upgraded luminosity of L=1035 cm-2s-1 and smaller forward angles CLAS12with large acceptance and high luminosity provides a new physics reach. Present Day CLAS CLAS12

13. CLAS12 - Science program - forefront of hadron physics • 3 dimensional structure of the nucleon- a new frontier in hadronic physics Nucleon Generalized Parton Distributions (GPDs) and Transverse Momentum Dependences (TMDs) – exclusive and semi-inclusive processes with high precision. • Precision measurements of structure functions • Elastic & Transition form factors at high momentum transfer • Hadronization and Color Transparency • Hadron Spectroscopy – heavy baryons, hybrid mesons Already approved experiments by the JLab program advisory committee, correspond to about 5 years of scheduled beam operation. => Volker’s talk CLAS12 will support the highest nuclear physics priorities outlined in the NSAC 2007 Long Range Pla

14. CLAS12 - Capabilities Capabilities to measure exclusive processes at 12 GeV • Operating luminosity up to 1035 cm-2sec-1 - small cross sections • High momentum and small polar angles • Particle ID to high momentum for e-/π-, π/K/p, γ/πo separation • Momentum & angle resolution for use of missing mass techniques • Coverage of large ranges in polar and azimuth angles • Identify detached vertices for weakly decaying strange baryons Solution: • Reduce DC occupancies to reach higher luminosities • Reduced solid angle seen by each cell, reduce time window • Improved magnetic shielding for Møller background .. • Upgrade the forward PID system • Additional high-threshold Cherenkov detector for π, K, p rejection • Improve timing resolution of the Time-of-Flight detectors • Improve calorimeter granularity for πo/γ separation • Add tracking capabilities for improved vertex resolution • Complement the forward detection system with central detector • Tracking and magnetic analysis at large angles with solenoid magnet • Particle identification capabilities with central Time-of-Flight system • Operation of a dynamically polarized target

15. CLAS12 –Design Parameters Forward Central Detector Detector Angular range Tracks 50 – 400 350 – 1250 Photons 30 – 400 n.a. Resolution dp/p (%) < 1 @ 5 GeV/c < 5 @ 1.5 GeV/c dq (mr) < 1< 10 - 20 Df (mr) < 3< 5 Photon detection Energy (MeV)>150n.a. dq (mr) <4 @ 1 GeVn.a. Neutron detection efficiency< 0.7 (EC+PCAL) n.a. Particle ID e/p Full range n.a. p/pFull range< 1.25 GeV/c p/K Full range< 0.65 GeV/c K/p < 4 GeV/c < 1.0 GeV/c p0gg Full rangen.a. hgg Full range n.a. Forward Detector Central Detector

16. CLAS12 Detector Grouping Forward Detectors: LTCC, FTOF, PCAL, EC, all supported by Forward Carriage HTCC Supported on Cart on Space Frame Subway Tracking Assembly: Drift Chambers Supported by the TORUS also Moeller Electron Shield and Inner Calorimeter Central Detectors: CTOF, SVT Supported from the SOLENOID Beamline: Raster Magnets, Beam Position, Targets Systems, Moeller System, etc. Torus Solenoid

17. CLAS12– Central Detector • SVT - Charged particle tracking in 5T field • Vertex reconstruction • ΔT < 60psec in CTOF for particle id • Moller electron shield • Polarized target operation ΔB/B < 10-4 • in 2.5x4 cm cylinder around center

18. CLAS12 - Institutions • United States of America: • - Argonne National Laboratory, Argonne, MI • - California State University, Dominguez Hills, CA • - Catholic University of America, Washington, DC • - College of William and Mary, Williamsburg, VA • - Christopher Newport University, Newport News, VA • - Fairfield University, Fairfield, CT • Florida International University, Miami, FL • Hampton University, Hampton, VA • - Idaho State University, Pocatella, ID • - James Madison University, Harrisionburg, VA • Norfolk State University, Norfolk, VA • North Carolina A&T, State University, Greensboro, NC • - Ohio University, Athens, OH • - Old Dominion University, Norfolk, VA • - Renselaer Polytechnic Institute, Troy, NY • - Temple University, Philadelphia, PA • - Jefferson Lab, Newport News, VA • - University of Connecticut, Storrs, CT • - University of New Hampshire, Durham, NH • - University, of Richmond, Richmond, VA • - University of South Carolina, Columbia, SC • University of Virginia, Charlottesville, VA • Armenia: • - Yerevan Physics Institute, Yerevan, Armenia France: - Grenoble University, IN2P3, Grenoble - Orsay University, IN2P3, Paris - CEA Saclay, IRFU, Paris Italy: - INFN - Frascati, Rome - INFN - Genoa, Genoa - INFN - University Bari, Bari - INFN - University Catania, Catania - INFN - University Ferrara, Ferrara - INFN - ISS Rome 1, Rome - INFN - University of Rome Tor Vergata, Rome Republic of Korea: - Kyungpook National University, Daegu, Korea Russian Federation: - MSU, Skobeltsin Institute for Nuclear Physics, Moscow - MSU, Institute for High Energy Physics, SiLab, Moscow - Institute for Theoretical and Experimental Physics, Moscow United Kingdom: - Edinburgh University, Edinburgh, Scotland - Glasgow University, Glasgow, Scotland • Strong International Collaboration

20. Hall B Magnets Progress • Torus contract awarded September 4, 2009 • Solenoid contract awarded November 20, 2009 • Both are performance-based contracts to prepare manufacturing drawings, build, install and commission, using JLab-supplied reference designs • Torus is to be assembled and tested in Hall B • Three reviews to-date held for each magnet • Ongoing activities • From JLab side: • QA of main design parameters for both magnets • From Wang NMR side: • Development of the two winding machines • Development of the soldering machine • Test windings • Preparation of final/manufacturing design documents

21. Five detectors to be underway in FY10 Drift Chamber has one factory “in production” and is setting up the two off-site ones, planned to start early/mid FY11 PreShower Calorimeter and High Threshold Cerenkov Counter are in production on parts and sub-assemblies. PCAL construction into sectors starts FY11; HTCC mounts mirror assemblies into main box in late FY12 Forward TOF is in procurement phase for PMTs, bases and scintillator; assembly is planned FY11-FY13 Silicon Vertex Tracker has bids back on first batch of sensors, preamp chips being test-probed prior to ‘dicing’ from production wafer, and flex interconnect cable designed. Stave construction planned to start middle of FY2011. The first ramp-up is underway. There is a second stage of ramp-up in FY12, notably for the drift chambers. Factories are planned to accommodate added workers/throughput. Hall B Detector Progress PCAL scintillator U-layer Drift Chamber stringing HTCC Region 3 mirror molds

22. Construction Highlights

23. Summary • CLAS12 designed for fundamental science program • SC magnets – Solenoid and Torus in construction phase • Construction has begun on five detectors • Drift-Chambers (DC) • Silicon Vertex Tracker (SVT) • Forward Time-of-Flight (FTOF) • Pre-Shower Calorimeter (PCAL) • High Threshold Cerenkov Counter (HTCC) • Collaborating institutions stepped up for significant contributions toward detector construction • CLAS12 is on schedule for installation start in 10/2012