Agenda Cooling finger HV-Prep Valve (2-3/4” vs. 4-1/2“) Puck moves = QE falls Prep vacuum & bakeout Abnormal beam shape and orbit from HV chamber.

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Presentation transcript:

Agenda Cooling finger HV-Prep Valve (2-3/4” vs. 4-1/2“) Puck moves = QE falls Prep vacuum & bakeout Abnormal beam shape and orbit from HV chamber

Cooling finger Puck/photocathode heated to 580 C (0.5 to many hours) Cooling time to 100 C about 2 hours, to 30 C about 6 hours Would like LL puck cooling time similar to BP (~ 2 hours) Different configuration Prep=heat chamber HV-Prep Valve (2-3/4” vs. 4-1/2”) Longitudinal manipulator alignment is quite good Retraction success is 100% Insertion success is ~95% Puck scraping valve ID progressively worsening Last retraction required “bending” manipulator

Puck Move = QE falls On May 30 QE scans vs. puck moves 5.4% initial 4.2% out/in 4.2% no move 3.5% out/in 2.5% out/in 2.2% out/in On May 31 heat/activate and recover 14.1% QE scans on June 2 w/ valve open/closing

Prep Vacuum vs. HV-Prep Valve BP Prep base vacuum nA (50-90 nA during activation) LL Prep base vacuum nA ( nA during activation) Valve ClosedValve Open Hydrogen Nitrogen

Abnormal beam shape and steering from HV chamber Beam from photocathode “center” requires large vertical correction Matt beam steering (4pm good, 10pm bad) Ken electrostatic simulations (effect of cathode tube vs. no tube) Joe mask activation

No heat cycle No mask activation (2600,2600) Yes heat cycle No mask activation (2600,2200) (calibrated 4.94 um/step)