PC-2015-12-17-optics » History » Revision 7

Revision 6 (Rogers, Chris, 18 December 2015 09:32) → Revision 7/8 (Rogers, Chris, 18 December 2015 09:44)

h1. PC-2015-12-17-optics 

 15:00 in the ATLAS building 

 h2. Phone Details 

 h2. 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) 
 ** 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 

 h2. 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)