Bubble Chamber Beam Test August 2015

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Emittance Measurements, September 3, 2015

  • We measured (normalized) emittance and Twiss parameters for the horizontal and vertical planes as a function of momentum (6.7, 7.7 and 8.3 MeV/c).
  • The results from a previous measurements is summarized in JLAB-TN-14-004 (February 2014): Transverse Beam Characterization in the CEBAF 5 MeV Region

media:TN-14-004.pdf media:TN-14-004.docx



Beam Charge

Maximum ¼ Cryo-unit Gradients

Calibrate ¼ Cryo-unit Gradients

Beam Energy

Bubble Chamber Digital Camera with beam in Injector

  • On Tuesday August 11, around 9:30 - 10:05 pm, we tested the bubble chamber sensitivity to gammas with beam to Faraday Cup 2 and 5D line. We did not see any thing on camera, none of the pixels showed any activity, nothing.

These were the beam conditions:

  1. 30 uA CW (6.3 MeV) at Faraday Cup 2
  2. 10 uA CW at 5D Line radiator/dump
  3. 10 uA CW at 5D Line Faraday Cup
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