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EG1-DVCS Highlights and Status

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Presentation on theme: "EG1-DVCS Highlights and Status"— Presentation transcript:

1 EG1-DVCS Highlights and Status
Erin Seder University of Connecticut

2 Experimental Goals DVCS ep epg AUL ALL DVMP ep epp0 AUL ALL ep eph
SIDIS ep ep X AUL ALL + -

3 Target Material Solid NH3 granules Dynamic Nuclear Polarization
high polarizability (~82%) Monitored using Nuclear Magnetic Resonance Resistant to radiation damage Repaired by a process of annealing 2 Samples Irradiated in 2005 – top target Irradiated in 2007 – bottom target Carbon Empty

4 Polarized Target Cryostat
Banjo chamber containing the target in a bath of LHe Refrigerator cools the banjo from 4 to 1K using evaporative cooling Magnet 5T superconducting magnet P1/2 = tanh(mB /kT)

5 NMR Monitoring Positive Negative changing polarizations
m wave frequency 139.61GHz 121.33A 139.90GHz 121.4A Magnet current Top target Bottom target anneal pos neg neg pos pos neg

6 Target/Beam Positioning
& Crosshair for Alignment Raster Size Target Cup Wall Raster x, y = 750 mV (~6.7 mm)

7 Accumulated Charge Beam energy = GeV Beam current = 7 nA

8 Kinematic Plots for ep->eX
Electron PID: dc(), cc(), sc(), ec() > 0, dc_stat(), ec_stat(), sc_stat() > 0 EC_tot/p > 0.2, EC_inner > 0.06, nphe > 25, minimum momentum cut > 1.0 GeV, -61 < vertex(e) < -56

9 Q2> 1 GeV and W>2 GeV events
Beta vs. momentum and mass distribution for positive and negative tracks

10


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