h1. PC-2015-12-17-optics

15:00 in the ATLAS building

h2. Phone Details

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

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)

** 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

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)