1 / 13

Green Compton Polarimeter Upgrade For Hall A Collaboration Meeting December 16 th 2004

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.

henry
Download Presentation

Green Compton Polarimeter Upgrade For Hall A Collaboration Meeting December 16 th 2004

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. Optical Layout

  7. 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

  8. Laser Specifications

  9. 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

  10. 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

  11. 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

  12. 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

  13. End of Presentation Thank you

More Related