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Advanced Physics Program Upgrade for Higher Voltage Operation

Enhance photocathode chamber with inverted HV capabilities, install new Wien for better transmission, and test functionality for optimal polarization setting. Explore new ceramic insulators for electron gun improvement and cost reduction.

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Advanced Physics Program Upgrade for Higher Voltage Operation

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  1. Summer ‘09 SAD Same good photocathode PREP and LOAD chambers • 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” HV chamber with capabilities for higher voltage, anticipating better transmission & photocathode lifetime Preserve baked region, continue R&D/BS during Fall H-Wien + Quads Harp/MFA0I03 “match point”

  2. Gun Status • Present Ceramic • Exposed to field emission • Large area • Expensive (~$50k) Medical x-ray technology e- • New Ceramic • Compact • ~$5k neg modules New design Want to move away from “conventional” insulator used on allGaAsphotoguns today – expensive, months to build, prone to damage from field emission.

  3. Mechanical Layout

  4. Optical Layout (Wien=0)

  5. Optical Layout (Wien=90, Quads=OFF)

  6. Optical Layout (Wien=90, Quads=ON)

  7. Optical Layout (Wien=90, Quads=ON) Max. B’L ~23 G Will use QS (B’L ~ 13G/Amp) 200keV increase is 50% (OK)

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