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Gun3 2004 summer shutdown New NEG’s - Ten 9.5” strips New NEG tube – 27 hr. sputtering time

Preliminary SVT4722#2-GUN3 Status (1/12/05). Gun3 2004 summer shutdown New NEG’s - Ten 9.5” strips New NEG tube – 27 hr. sputtering time New cathode – “yellow” 25 deg SS polished to 1um, <2pA @ 100kV New cesiator strips Sacrificial bulk w/ large Ta cup Bakeout good – no leaks

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Gun3 2004 summer shutdown New NEG’s - Ten 9.5” strips New NEG tube – 27 hr. sputtering time

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  1. Preliminary SVT4722#2-GUN3 Status (1/12/05) • Gun3 2004 summer shutdown • New NEG’s - Ten 9.5” strips • New NEG tube – 27 hr. sputtering time • New cathode – “yellow” 25 deg SS polished to 1um, <2pA @ 100kV • New cesiator strips • Sacrificial bulk w/ large Ta cup • Bakeout good – no leaks • Bulk activation 4% at 670 nm w/ UHV ~ 5nA baseline (ELOG1228461) • HiPot stalk out 120kV OK vac burst 110kV & stalk in 110kV OK – cathode OK • SVT4722#2 loaded • No hydrogen cleaning • In solder – no heat in air • 5 mm polished Ta cup • Stalk#4 • Loaded into Gun3 on 8/11/04 • Bakeout good – no leaks • Cathode heat 1 hr @ 630 C • Activation OK - 5% at 655 nm and 0.65% at 769 nm

  2. Hall A 776 nm • Gun3 SVT4722#2 • Heat • 45 min up • 15 min @ 630 • Cool • Reactivate • ~15 yo-yo’s • Vacuum < 20 nA • Hi-Pot • Stalk Out - OK • Stalk In - OK • Typ. 60 mA leakage Hall B 655 nm Hall C 782 nm

  3. Notably good injector setup… • Measured beam polarization, surface charge limit, analyzing power • Calibrated HVPS against Pcup • Early demonstration of possible “Qweak”-type beam

  4. ELOG#1202899 SVT4722#3VGUN (Reblochon)

  5. Calibrate laser power vs. attenuator over relevant range… • Measure photocurrent • vs. laser power twos ways… • 200 mA ramp • 100 mA + 100 mA ramp

  6. QE vs. laser power at 776 and 782 nm • one makes sense, the other less so…

  7. Analyzing power is low, but not zero… • A ~ 2.1% B ~ 0.2% C ~ 2.2%

  8. Physics started Saturday, but poor transmission…

  9. Sunday, on-call • Corrected orbit at 1I03/1I04 – transmission fully restored (good) • Hall B1 picomotor to reach 30 nA – too far (spot move!) No more orbit shifts. Good transmission.

  10. Hall A 776 nm Hall B 655 nm Hall C 782 nm

  11. QE vs. Time (yet), because… • Daily charge plot app not working – Bickley will fix… • StripTool “archiver feature” does not dump data… • Archiver for gun current is running at 5 Hz (eek!) – too much data, too late… New “starting line” Hall B “spot move”

  12. Efficiency numbers…

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