GTS meeting 3 1 16

• Update – Puck and Gun Magnet: media:Update-Puck-GunMagnet_01March2016.pdf media:Update-Puck-GunMagnet_01March2016.pptx

• Alpha Magnetics Drawing: media:JLAB_COIL_2-24-16.pdf

• Latest Drawings:

• The cathode prep chamber is under vacuum with two pucks (bulk GaAs) + one puck inside the gun
  • The bottom cathode heater works.
  • We have tested several puck transfer maneuvers.
  • Need to adapt motor to bottom heater
  • We will bring the rack from Mamun's depo chamber in the vacuum lab to the GTS for now, including the computer.
  • The chamber is ready for bake.
• 

• Shed barrel polishing update.
  • Shed #1 was hand polished by Bubba with 320 grit sandpaper, then put into the barrel polisher for ~ 1 hr with corncob. Shed #2 was utilized just as a counterweight immersed in corncob and straight out of the machine shop with no further surface treatment. The results: Shed 1 comes out looking as if it were DPP, shed #2 comes out mirror finish, but the machining markings can still be seen, and the polishing scratches (inherent to the corncob / polishing media) are more easily seen.
  • So, the procedure so far: polish with 320 grit sand paper, then ~ 1 hr in the barrel polisher with corncob.
  • Next, Try cones instead of 320g grit sand paper.
  • Yan's optimized shed next to UITF ball electrode before barrel polishing
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  • Yan's optimized shed next to UITF ball electrode after barrel polishing
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