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Summer ‘09 SAD

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.

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Summer ‘09 SAD

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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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