HDice overview A.M. Sandorfi
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1 Sandorfi g14 Readiness Mar30 11 HDice overview A.M. Sandorfi g14 goals HD target characteristics steps in bringing a polarized HD target to CLAS schedule AMS-Overview
2 Sandorfi g14 Readiness Mar30 11 g14 goals 1) E circularly polarized photons, from bremsstrahlung of longitudinally pol e, & linearly polarized photons, from bremsstrahlung of unpol e in diamond polarized H and polarized D in solid HD targets 2) test of polarization relaxation time of polarized HD with e beams i) low current radiation damage test in May 11 ii) modest current (few na) test with high cooling power in Dec 11 or May 12 G14 goals
3 # # HDice - at a glance: polarized targets of solid hydrogen,!+hd (E06-101); e+hd (E08-021) polarize to frozen-spin state in Lab transfer to CLAS for exps in Hall B HDice Lab Hall B renovated icelab in TestLab Annex polarizing equipment from BNL Oxford dilution fridge: 12 mk and 15 tesla " polarized in a few days " frozen-spin in a few months " in-beam lifetime ~ a few years
4 General requirements for target operation: - lifetime extremely long; no need to repolarize ; but, CANNOT quickly repolarize either! power and LHe cannot go away, ever! I. HDice Lab:! 0.25 MW from dedicated diesel generator with 60 KVA UPS to remove switching glitch! 500 L dewars of LHe, commercially filled (Linde) II. Hall B:! new 22 KVA feed from diesel generator with UPS to remove switching glitch! 500 L buffer dewar of LHe, filled from ESR - spare 500 L dewar from HDice Lab, if needed - Target transfers " the trickiest part of the target cycle Requirements for tgt cycle
5 Steps in bringing a polarized HD target to CLAS Remove from dilution refrigerator with Transfer Cryostat (0.010 K and 15 T) (2 K and 0.1 T) Requirements for tgt cycle
6 transfer to Production Dewar for pre-run NMR polarization measurement - 2 K and up to 2 T transfer to Storage Dewar, mounted in shock absorbing frame K and 3 T crane onto truck and drive to Hall B remove Storage Dewar (SD) from shock frame and crane to level 2 deck remove from (SD) with transfer cryostat and load into IBC on level 1 Requirements for tgt cycle
7 # # HDice In-Beam Cryostat for CLAS designed for both! (Start Counter) and e - (mini-torus) ASME code review nearly complete under construction 0.05 K 0.6 K 1 K 4 K HDice Transfer Cryostat HDice IBC-CLAS loading HDice In-Beam Cryostat
8 In-beam Cryostat - design characteristics; construction requirements: axial dilution refrigerator, operating either vertically (tgt loading) or horizontally (exp)
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12 Beam characteristics and target alignment General target requirements: - target cells are 15 mm 50 mm long - alignment: approximate with warm fiducial survey; use counting rates to find the center when cold Photon running (E06-101): - 60 na max e -, stopped in tagger dump - photons from 10 4 r.l. radiator; 2 mm bremsstrahlung collimator, with 6 mm cleanup after Pair spectrometer 10 mm max on target - centered w segmented CLAS Start Counter surrounding target cryostat Electron Tests: - i) May 11: 0.5 na max, stopped in Hall B dump ii) Dec 11 or May 12: 10 na, stopped in Hall B dump - alignment procedure: a) use brem photons and detectors to center beam; b) remove radiator and degauss tagger magnet - raster beam over 10 mm Beam Characteristics and alignment
13 IBC LHe/magnet can Activity Name assemble and wind magnets... install instrumentation & super-insullation weld LHe can closed Central Access line welding of OVC and 6"-10" pumping lines... Heat exchanger(s) construction spiral heat exchanger assembly 1/8" SS pre-cool spiral for 1" 1K line Mixing chamber... install 1/8" pre-cool spiral weld LHe piping assemble & test needle valves install needle valves mount Rad baffle & central access line install Still & 1K pot weld MIX feed to spiral install spiral heat exch and MIX on central line install instrumentation & super-insullation Scattering chamber - OVC nose Simple nose... Final nose with cooled Safety coil... NMR coil for IBC... IBC assembly Assembly cradles... install LHe can around central access install 80K shield install OVC final leak check cool down in HDice Lab warmup in HDice Lab Hall activity Install in Hall B cooldown Target production minimum aging for tgts 2,3 1 March 2011 April 2011 F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F
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