Darco - Attempt to see tracks!

• Rebuilt TPC amplification plane late last week
• Detector centered (roughly) (it is about 70 pixels off in x and 145 in Y)
• Friday
  • Play with CCD, attempt to look for dark hits from cosmics depositing energy in the CCD
  • Hot Spot on the bottom right of the frame, around 2600x0
  • Cosmic_CCD_HIT.png: Enclosed in 10x20 frame
    
• Monday
  • Vessel started out at approx 3.7x10^-6 torr
  • Prepared the gas lines for CF4 gas use
  • Evacuuated line and pumped back out, no leaks (or no bad leaks)
  • Backfill vessel to ~100 torr (1.93PSIA)
  • Slowly ramp up Cathode to 750V
  • Slowly ramp up Anode to 500V, See evidence for sparks, we have trouble reaching 500V in a stable state without sparks.
  • No obvious signs of tracks
  • Anode shorted out after approx 1hr operation, not huge spark rate but obvious issues
  • DSC_3962.jpg:
    
  • Rebuild
• Tuesday
  • Limit for the Anode is roughly 700V without sparks, pushing much further gives a constant sparking rate several 2-3 / s
  • See one event which gives the largest 'track' like object but this is a single event in roughly 30mins of ccd exposures
  • Cosmic_or_Alpha_CCDHit.png: Enclosed 20x50 frame