PC-2015-12-17-optics¶

15:00 in the ATLAS building

Phone Details¶

http://mice.iit.edu/phonebridge.html

Agenda¶

• Field mapping (Victoria/John Cobb/Jo Langford)
• Theoretical magnet parameters and effect of iron (Jaroslaw/Victoria)
  • Field map of SSU for 7th October run
• Transfer matrix and magnet alignment (Sophie/Chris Rogers)
• Beamline commissioning (Victoria/Jaroslaw)
  • Contingency if DS is not available in 2016
  • Beamline commissioning data in December?
• Optics without M1 at SSD (Chris Rogers/Scott Berg)
  • Tracking (Ao/Ryan/Chris Hunt/Chris Rogers)
  • Ao's work as presented attachment:StepIV_noM1_update_Dec17.pdf
  • Ao's work with 150 mm aperture in SciFi region attachment:StepIV_noM1_update_Dec17_SciFi.pdf
  • Algorithm to calculate the phase space volume (vs RMS emittance)
  • Track fitting/extrapolation for indirect emittance measurement
• Bayesian analysis (Rob Ryne)
• Demonstration of Ionisation Cooling paper (Jaroslaw/JB Lagrange)
• Demonstration of Ionisation Cooling optics w/o Match Coil 1 in downstream Spectrometer Solenoid (Dave Neuffer)
• Demonstration of Ionisation Cooling alignment and tolerances (Alan Young)
• Date of next meeting
  • 7th January optics review special?
  • 14/15 January optics review

Notes¶

Hall probes

• Time is negative
• Hall probe closest to end plate is "-67"
• Rogers: compare hall probe with field during the ramp

Transfer matrix and optical alignment

• Looking at straight tracks data and calculating transfer matrix, compare with theory

Step IV optics

• ACTION BROSS: revised SSD limits with previous quench limit and safety factor
• Bross: Need to add the fiducial cuts
• Pasternak: use emittance of 140/200*6
  • Rogers: send an explanation?
• Tracker beampipe 200 mm should be 150 mm
• Hybrid mode: Bross - from hardware pov no problem; may require additional training
  • Risk that we may get additional training
• Rogers raised issue on M2 operation
  • Alan Bross: does not believe that running M2 increases the risks
  • Jaroslaw Pasternak: concerns about risk to push emittance measurement to the end
  • Jaroslaw Pasternak: can we get good enough transmission? Ao has run simulations that show we can
• John Cobb: we have not shown that we have a solution
  • There is no plot that we can stand behind at the 100 % level
  • Scott has demonstrated that we increase the phase space density
  • Rogers: we need to do the full reconstruction and analysis chain for an optimised run
  • Scott: and we should do the full analysis that shows particles didn't scatter out of the aperture to produce amplitude increase (or whatever)
  • Bross: we will need to have a crisp answer to the discussion at the review
• Bross: further comments for Ao are welcome (by email)