DA1 First Experiments with a Polrized Hydrogen Jet DA1第一次实验极化氢射流.pptVIP

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DA1 First Experiments with a Polrized Hydrogen Jet DA1第一次实验极化氢射流.ppt

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DA1 First Experiments with a Polrized Hydrogen Jet DA1第一次实验极化氢射流

DA1. First Experiments with a Polarized Hydrogen Jet Target in RHIC Willy Haeberli Department of Physics, University of Wisconsin-Madison Nuclear polarization of H-atoms The Data (a sample) Forward scattering particle ID ; Correlation of Energy and position no hadronic spin-flip pp elastic 100 GeV/c FNAL E704 200 GeV/c data to analyze Recoil angle 89.5o Recoil energy 0.53 MeV 5.3MeV pp Analyzing Power 100GeV/c AN vs. momentum transfer Plans Plans: improve statistics, study systematic errors for absolute calibration accuracy ±5% analyze wider t-range to study pp interaction bunch field depolarization with 110 bunches improved measurement of H2 contamination of H-beam measure beam polarization at injection measure blue and yellow beam polarization APS-DNP W. Haeberli, University of Wisconsin Chicago October 29, 2004 RHIC pp accelerator complex BRAHMS PP2PP (p) STAR (p) PHENIX (p) AGS LINAC BOOSTER Pol. Proton Source 500 mA, 300 ms Spin Rotators Partial Siberian Snake Siberian Snakes 200 MeV Polarimeter AGS Internal Polarimeter Rf Dipoles p-C Polarimeters Absolute Polarimeter (H jet) 0.7? 1011 pol. protons/bunch 56 bunches AGS pC Polarimeters Strong AGS Snake + - + - + - + + - - + + L=4x1030s-1cm-2, Pbeam ~ 40% RHIC experiments will measure DG BUT HOW DOES ONE KNOW Pbeam? Colliding polarized protons couple directly to gluons (rather than via charge) - measure parton asymmetries. Measure polarization of gluons through g, jets, p pi’s, heavy quarks. G. Bunce DUBNA-SPIN-03 HERMES internal target Pure polarised gas targets: H, D, target polarisation: pT ? 85% Luminosity: 6*1033 cm-2 s-1(D @ 50 mA) ? spin reversal every 120 sec Factor 100 gain from use of storage cell number of events (a. u.) Reconstructed Missing Mass2 FWHM ~ 0.1 GeV2 Simulation MM2 FWHM ~ 0.1 GeV2 Inelastic Threshold GeV2 ?u+?d+?s ? 0,20 ? 0,04