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Enhancements to High Voltage Chambers and Beamline for Spin Flipper in 2009

This document outlines the progress and updates made in January and March of 2009 related to the preparation and loading of high voltage (HV) chambers for particle acceleration, including the expected longevity of photocathodes. Key developments include additional solenoids for improved phase matching, modifications to beamline optics, and new setups for spin flipper stages aiming for optimized performance. Collaboration among teams has led to the ordering of new components and the design of specialized magnets for enhanced experimentation in particle physics.

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Enhancements to High Voltage Chambers and Beamline for Spin Flipper in 2009

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  1. January 2009 PREP & LOAD chambers: these work well HV chamber : 30C photocathode lifetime. Expected at least 100C Field emission killed photocathode in 2007 M. Poelker 4/17/09

  2. March ‘09 SAD PREP and LOAD chambers : no change New HV chamber. Anticipate good lifetime Ready for Fall Second solenoid added to null phase advance. Electrode replaced: a working spare (?)

  3. Summer ‘09 SAD • Spin Flipper: Stage 1 • Remove unbaked girder region between valve & chopper • Install new “normal” Wien for Physics program, with quad correction • Thoroughly test & transfer functionality for setting pol. • No need to move laser room. Install “inverted” gun Commission at 100kV, push to higher voltage for better transmission, Evaluate capture ops Preserve baked region, continue R&D/BS during Fall H-Wien + Quads Harp/A2 “match point”

  4. Winter ‘10 SAD • Spin Flipper: Stage 2 • Replace baked region with spin flipper (vertical Wien filter + solenoid(s) and quads. • Maybe tilted pole Wien designed specifically for 90 deg operation at given known gun voltage Modify inverted gun if necessary, hopefully not Upgrade the “blue tank”? Same Wien filter to set longitudinal polarization for Physics Spin Flip V-Wien Spin Flip Solenoid H-Wien + Quads Harp “match point” Harp/A2 “match point”

  5. New A1/A2 layout nearly complete

  6. J. Grames modeling new beamline with ELEGANT. Agreement with Parmela. Now turning ON Wien and setting quad strengths and positions……

  7. Darmstadt quad triplet Custom crosses, nipples, bpms, viewers, harp, ion pumps, mounting fixtures, girder, magnets, New A1 dif pump

  8. Magnets • “ordered” six sets of CEBAF skew quads • Jay/Joe/Danny working to build at least three Darmstadt quad triplets • Need to order at least two FEL-type solenoids • Need to design and manufacture tilted-pole magnet for “self-correcting” 90-degree Wien • Earth field bucking magnets…

  9. The Workload • Beamline Optics for PQB: Joe, Yves, Reza • Design/Engineering: Danny M. and Karl S. • Magnet Design: Jay, Mike T.? • Parmela Verification: Yuhong, Ashwini • Inside and Outside machine shops…

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