Difference between revisions of "Spring 2021 - Rebuilding Photogun"

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* (done) Repair stalk heater driver => https://logbooks.jlab.org/entry/3871902
 
* (done) Repair stalk heater driver => https://logbooks.jlab.org/entry/3871902
  
===Vent HV Chamber===
+
===Replace cathode electrode ===
* fiducialize Nb cathode
+
* leak test large grain Nb cathode/ceramic/flange assembly
* align cathode (to anode)
+
* fiducialize Nb cathode to 10" flange (old method glued fiducials)
* align LM to cathode
+
* (maybe) fiducialize existing 10" flange to HV chamber
* fiducialize HV chamber
+
* vent HV chamber, remove cathode electrode, searching for puck tab
* align HV to chamber Y
+
* fiducialize anode to HV chamber
* re-align laser
+
* align cathode to anode
* find missing puck tab in HV chamber
+
* align LM to cathode (after venting depo)
 +
* align HV to chamber Y and re-align laser for retro-reflection
  
===Vent Depo chamber===
+
===Replace depo schneedle ===
 
* Make (2) SS schneedle w/o silver plating, replace depo chamber silver plated schneedle [[media:ACC2003000-0219 schneedle.pdf]]
 
* Make (2) SS schneedle w/o silver plating, replace depo chamber silver plated schneedle [[media:ACC2003000-0219 schneedle.pdf]]
 
* NF3 leak value => leave as-is
 
* NF3 leak value => leave as-is
 
* align mask, fix w/ two set screws
 
* align mask, fix w/ two set screws
 
* replace K source with Alvatec Sb source?
 
* replace K source with Alvatec Sb source?
 +
 +
===Fix pucks===

Revision as of 15:59, 5 April 2021

Other jobs

Replace cathode electrode

  • leak test large grain Nb cathode/ceramic/flange assembly
  • fiducialize Nb cathode to 10" flange (old method glued fiducials)
  • (maybe) fiducialize existing 10" flange to HV chamber
  • vent HV chamber, remove cathode electrode, searching for puck tab
  • fiducialize anode to HV chamber
  • align cathode to anode
  • align LM to cathode (after venting depo)
  • align HV to chamber Y and re-align laser for retro-reflection

Replace depo schneedle

  • Make (2) SS schneedle w/o silver plating, replace depo chamber silver plated schneedle media:ACC2003000-0219 schneedle.pdf
  • NF3 leak value => leave as-is
  • align mask, fix w/ two set screws
  • replace K source with Alvatec Sb source?

Fix pucks