Polarized Solid Targets for Hadron Beams - Overview Choosing a target for Drell Yan Experiments.

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Presentation transcript:

Polarized Solid Targets for Hadron Beams - Overview Choosing a target for Drell Yan Experiments

Issues Type of Refrigerator and Recent Experiments Polarizable Materials Beam Heating and Radiation Damage Adiabatic Fast Passage (FP)

Choosing a Refrigerator and “Recent” Experiments High Intensity > 10 9 to < particles/sec Use 4 He Evaporation Refrigerator and ~ 5 T Magnet Low Intensity < 10 9 Particles/sec Dilution Refrigerator 3 He/ 4 He mixture Very Low Intensity <10 7 Paricles/sec Frozen Spin Refrigerator Chris Keith’s Talk

“Recent” Experiments (Since ~ 1990) SLAC (E143,E155,E155X) Electrons ~ GeV Duty Factor Average Intensity ~ 100nA (~ e/sec) BNL (AGS) Protons 24 GeV, Duty Factor ~30% Average Intensity ~ protons/sec JLab (6 experiments, two 4 He fridges) Electrons 1 -6 GeV Duty Factor 100% Average current ~100nA and ~ 5nA

Related Experiments CERN (EMC, SMC, COMPASS) muon beams, GeV Jlab (FROST) photon beams 1 – 3 GeV

Target Materials Properties: High absolute Polarization and dilution factor Fast build up Slow Polarization Decay (radiation damage resistance) Talk by James Maxwell Fast Reversal ? AFP? Talk by Patrick Hautle

Radiation resistant materials Ammonia and deuterated ammonia Proton polarizations > 90% Deuteron Polarizations ~ 50% Lithium Hydrides 7 LiH ~50% at 5 T and 1 K 6 LiD ~ 30% at 5 T and 1K for both

Adiabatic Fast Passage (AFP) Apply RF pulse to target and if certain conditions are met, the ensemble of spins (or a fraction of them) will flip. Talk by Patrick Hautle