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Hall B Cryogenics CLAS and CLAS12

Hall B Cryogenics CLAS and CLAS12. David Kashy Hall B Lead Engineer May 26, 2010. CLAS. Cryogenic Components Transfer line from ESR 6 coil torroidal field magnet with s ervice module –built by Oxford Instruments operating since 1995

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Hall B Cryogenics CLAS and CLAS12

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  1. Hall B CryogenicsCLAS and CLAS12 David Kashy Hall B Lead Engineer May 26, 2010

  2. CLAS • Cryogenic Components • Transfer line from ESR • 6 coil torroidal field magnet with service module –built by Oxford Instruments operating since 1995 • 500 liter liquid helium dewar – standard product with 2 liquid withdrawal bayonets and cold gas return • Liquid helium cooled cryo-target - capable of liquefying hydrogen, deuterium, He4 and He3 • Frost Target and 5 Tesla Polarizing Magnet • 5T Polarized Target – cooled with LHe • 4.7T Solenoid – cooled with LHe • HDIce – In development also cooled with LHe

  3. CLAS Cryogenic Hardware Microwave Polarized Target Cryofab 500 l Buffer Dewar CLAS OXFORD Torus Frost Polarizing Solenoid 30mK FROST Target 4.7 T DVCS Solenoid Photon Target Cell 40 x 4cm Electron Target Cell 2.5 x 1cm

  4. Scheduled Experiments 2010-2012 • Frost: Torus, Buffer Dewar, Frost Target and Polarizing Magnet • HDIce/HD DVCS: Torus, Buffer Dewar and In-Beam-Cryostat • Primex: No cryogenics, but keep Torus cold • Two Photon Exchange: Torus, Buffer Dewar and Standard Cryotarget

  5. CLAS Loads • Torus: 110 Watts and 0.6 g/s lead cooling • Transfer Lines and Buffer Dewar: 30 Watts • Targets and Solenoids – All are of same order of magnitude ≤ 1g/s (liquefaction loads) • LN2 – 7 g/s including TL

  6. CLAS 12 • Cryogenic Components • Transfer line from ESR • 500 liter liquid helium dewar – standard product with 2 liquid withdrawal bayonets and cold gas return • Liquid helium cooled cryo-target - capable of liquefying hydrogen, deuterium, He4 and He3 • New 6 coil torroidal field magnet with service module • New 5 Tesla Solenoid Magnet • New Distribution Can for both magnets and connection of Buffer Dewar • New Polarized Target • HDIce– In development also cooled with LHe

  7. CLAS 12 New hardware Distribution Box Torus – WANG NMR Solenoid – WANG NMR

  8. CLAS12 Loads • Torus: 100 Watts and 0.6 g/s lead cooling (per specification note: Vendor claims less) • Solenoid 70 Watts and 0.6 g/s lead cooling (per specification note: Vendor claims less) • Transfer Lines, Distribution Box and Buffer Dewar: 60 Watts • Targets– All are of same order of magnitude ≤ 1g/s (liquefaction loads) • LN2 – ~10 g/s including TL

  9. CLAS12 Load Summary • Refrigeration load 230W • Liquefaction load 2.2 g/s • LN2 10g/s • LHe Inventory 1150 liter • LN2 Inventory 200 liter • Start up date April 2013 • Duration 10+ years

  10. Questions?

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