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Green Compton Polarimeter Upgrade For Hall A Collaboration Meeting December 16 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.
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Green Compton Polarimeter UpgradeFor Hall A Collaboration MeetingDecember 16th 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
Electron Detector Electron Beam Electron Beam To Target D1 D4 D2 D3 γ Photon Detector 15.35m Optical Table Pneumatic Isolators Cavity Preview of presentation • Present Compton • Review • Status Compton Upgrade • Review • Status • Future plan Review of Compton
Electron Detector • 4 Planes • 48 micro strips/plane D4 To Target 5mm • FP Cavity • 1064nm • 1200Watts Electron Beam • Photon Calorimeter • PbWO4 • 5x5 array of 20x20x230mm D3 Review of Compton
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
Four-fold enhancement of F.O.M Doubling Frequency Improvements to Electron Detector, Photon Calorimeter, Photon Integrating method 1% absolute accuracy of beam polarization measurements at 0.85GeV Green Compton Upgrade Comparison of Compton Parameters
Specifications Prometheus Green Laser Output beam Wavelength 532 nm~ CW power 100 mW~ Spatial mode TEM00 (M2 < 1,1)~ Amplitude noise (10hz to 10Mhz) < 0.1% rms~ Warm-up time <1 min Linewidth, over 1 msc. 1 kHz(/ms)~ Coherence length, calculated > 1 km~ Frequency drift, at constant temperature 2 Mhz/min~ Thermal tuning range, continuous Thermal Response Bandwidth Thermal tuning coefficient 10 GHz 1Hz -6 GHz 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 Cavity Specifications
Specifications Prometheus Green Laser Output beam Wavelength 532 nm~ CW power 100 mW~ Spatial mode TEM00 (M2 < 1,1)~ Amplitude noise (10hz to 10Mhz) < 0.1% rms~ Warm-up time <1 min Linewidth, over 1 msc. 1 kHz(/ms)~ Coherence length, calculated > 1 km~ Frequency drift, at constant temperature 2 Mhz/min~ Thermal tuning range, continuous Thermal Response Bandwidth Thermal tuning coefficient 10 GHz 1Hz -6 GHz 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 Mirror Specifications
Status of Upgrade • Laser • Delivered • LSOP under development • Test area in He3 target lab (scheduled from January 2005) • 2. Mirrors • Ordered - Research Electro Optics (REO) • Status – in Fabrication • Confirmed delivery date – two weeks from now • 3. Cavity • Adapt basic design from SACLAY • Study improvements to mirror mounts • FEM analysis with IDEAS • 4. Servo electronics • Adaptation of the PVLAS design • Built by SACLAY • New set of locking electronics shipped from SACLAY • 5. Transport optics • Standard elements • Being ordered • Estimated delivery date end of January
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
Future Plans Polarization of present cavity Laser Studies Q1 - 2005 Cavity Prototype 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
End of Presentation Thank you