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
CLAS Cryogenic Hardware
CLAS OXFORD Torus
Frost Polarizing Solenoid
Cryofab 500 l Buffer Dewar
4.7 T DVCS Solenoid Photon Target Cell 40 x 4cm
Microwave Polarized Target
Electron Target Cell 2.5 x 1cm
30mK FROST Target
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
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
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
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
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 2013Duration 10+ years
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