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Agenda Cooling finger HV-Prep Valve (2-3/4” vs. 4-1/2“) Puck moves = QE falls

Explore the innovative HepaValve prep and cooling system for optimizing beam shape and chamber functions, featuring detailed insights on valve configurations, vacuum preparations, and beam steering adjustments.

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Agenda Cooling finger HV-Prep Valve (2-3/4” vs. 4-1/2“) Puck moves = QE falls

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  1. 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

  2. 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

  3. 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

  4. Prep Vacuum vs. HV-Prep Valve • BP Prep base vacuum 10-30 nA (50-90 nA during activation) • LL Prep base vacuum 100-300 nA (900-1000 nA during activation) -8 -9 -10 -11 -12 Valve Closed Valve Open Hydrogen Nitrogen

  5. 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

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

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