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Compton Polarimeter For GEN Meeting December 14 th 2004

Compton Polarimeter For GEN Meeting December 14 th 2004. Deepa Graduate Student @ Old Dominion University Graduate Student Research Associate Thomas Jefferson National Accelerator Facility 12000 Jefferson Ave, Newport News, Virginia 25606 deepa@jlab.org. Review of Compton. Electron

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Compton Polarimeter For GEN Meeting December 14 th 2004

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  1. Compton PolarimeterFor GEN MeetingDecember 14th 2004 Deepa Graduate Student @ Old Dominion University Graduate Student Research Associate Thomas Jefferson National Accelerator Facility 12000 Jefferson Ave, Newport News, Virginia 25606 deepa@jlab.org

  2. Review of Compton Electron Detector Electron Beam Electron Beam To Target D1 D4 D2 D3 γ Photon Detector 15.35m • Electron Detector • 4 Planes • 48 micro strips/plane Optical Table Pneumatic Isolators D4 To Target 5mm • FP Cavity • 1064nm • 1200Watts Electron Beam • Photon Calorimeter • PbWO4 • 5x5 array of 20x20x230mm D3 Cavity

  3. Photon Spectrum Count Energy

  4. Compton Electrons Count rate Asymmetry Left Off Right Background Strip number Strip number Electron Spectrum

  5. Compton results during HAPPEX

  6. Compton Results during HAPPEX

  7. Compton results during DVCS

  8. Status of present Compton Cavity locking problems during HAPPEX - Problem Fixed EPICS transferred to Accelerator Division Minor software related problems else smooth operation Laser standard operating procedure (LSOP) updated Liquid Crystal Variable Retarder (LCVR) under Evaluation – Credit to Lingyan Zhu Compton Operators trained Operations Manual updated

  9. Specifications Prometheus Green Laser Output beam Wavelength 532 nm~ Green Laser Head Green Laser Head CW power 100 mW~ Integrating Sphere Integrating Sphere Spatial mode TEM00 (M2 < 1,1)~ Diaphragm Wollaston Prism Diaphragm Faraday Isolator Amplitude noise (10hz to 10Mhz) < 0.1% rms~ Faraday Isolator Quarter-wave Plate Warm-up time <1 min Half-wave plate Half-wave plate Liquid crystal Variable Retarder Linewidth, over 1 msc. 1 kHz(/ms)~ Liquid crystal Variable Retarder Fabry- Perot Cavity Coherence length, calculated > 1 km~ Wollaston Prism Quarter-wave Plate Integrating Sphere Frequency drift, at constant temperature 2 Mhz/min~ Mirror Integrating Sphere Thermal tuning range, continuous Thermal Response Bandwidth Thermal tuning coefficient 10 GHz 1Hz -6 GHz Mirror Mirror Thermal tuning range, total 60 GHz~ Thermal tuning rate 10 GHz/sec Piezzo tuning range + 15 V (PZT tuning coefficient (MHz/V)) (PZT tuning Range(MHz)) 30 MHz (>2)~ +200~ Piezzo response bandwidth, small signal 100 kHz~ polarization, linear > 300 : 1, vertical Waist diameter, 1/e2, vertical 0.35 mm Waist diameter, 1/e2, horizontal 0.46 mm Beam divergence, full angle, vertical 3.9 mRad Beam divergence, full angle, horizontal 3.0 mRad Input and ambient requirements DC voltage/Current max load +5 V/6 A, - 5 V/4 A Operating ambient temperature 10 to 45 C° Relative humidity, non-condensing 10 to 90 % Size and weight Laser head, w, h, d 14.9,11.1,32.0 cm~ Mass 3.5 kg~ Standard electronics size, w, h, d 35, 14, 34 cm~ Standard electronics weight 10 kg~ Power supply Voltage AC 85 V to 265 V, 50 Hz to 400 Hz Electrical power consumption 20 W typical, 50 W maximum Optical Studies Phase 2 – Cavity Characterization Phase 1 – Laser Characterization Phase 3 – PDH Characterization

  10. Laser Studies Contributions Laser Characterization Q1 - 2005 Cavity Prototype LCVR Characterization Q2 - 2005 Mirror Finesse Measurement Q3 - 2005 Cavity locking - PDH Q4 - 2005 – Q2 2006 Polarization Studies Installation in Hall A Q3 - 2006 Q4 – 2006 Green Compton growth 2005 - 2006 Future Plans

  11. End of Presentation Thank you

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