There will be an analysis/diagnostics meeting Thursday 28th January at 14:00.

We will be in one of the usual meeting rooms in the Atlas building, using phone:

  • Tracker resolution and efficiency - Tracker Group
  • Tracker-to-tracker alignment - Melissa/Chris Hunt/John Nugent
    • Tracker Survey
  • Tracker alignment to field - Chris Rogers/Sophie
  • Cut-based beam selection vs 2015/01 data - Tanaz/Scott Wilbur
  • Ckov momentum scan - Ao, Durga
  • Full PID vs 2015/01 data - Celeste
  • Detector alignment - Francois
  • Detector Efficiencies - Jan/Francois
  • Paper: High precision measurement of emittance #1809 - Chris Hunt/Victoria
  • Date of Next Meeting


Chris Rogers
Ao Liu
Tanaz Mohayai
Scott Wilbur
Francois Drielsma
Durga Rajaram

Detector alignment

Francois - investigated inconsitencies from different dispersions, made some fiducial cuts on the sample, can converge to an alignment that is consistent throughout different runs; noted that June run had a problem, "survey gap" in TOF2, will check again in 1.4.0, put constants in the geometry to make everything aligned. Writing a MICE Note, minus TOF0.
Durga - asked Janusz to put a table to hold alignment corrections to the geometry. Janusz agreed to do that. Waiting for sign off on spec. Streamline geometry, a little easier to handle. Some discussion.

Tracker resolution and efficiency

Adam - just looking at helical. Consider a sample with at least 5 space points in each station. About 92-93 % recon efficiency for 3-5 space point tracks; 72 % recon efficiency for 5 space point tracks. Rogers notes very inhomogeneous tracker field. Adam proposes just loosening cuts. Chris Hunt and Heidt report fixes to MC recon. Code bug in Chris Hunt's code causing recon to behave oddly. Star issue came from geometry.

Cut-based beam selection

Scott - looking at tracker vs TOF; trying to distinguish muons from electrons
Tanaz - looking at MICE Note 473, based on G4BL MC run, would expect to see leakage of pions into the muon peak, Tanaz can dig at that


Durga - looking at reprocessing old Ckov data and new Ckov data; will dig out Step I unpacker for 2013 data

Detector Efficiencies

Francois - still on his job list
Durga - looking at intrinsic TOF efficiency; 99+% digit efficiency; 4% inefficiency for slab hits, not a digits issue; worse for slabs at the edge; noise effect? some space point inefficiency which may be a noise effect.
Rogers: consider different run settings to get different levels of noise - data ratio - consider Rob Fletcher MICE note 342

Emittance Paper

Blackmore - no update


Tanaz - set up a phone bridge


Paul Soler - pion paper was accepted by J. Inst.; few modifications were uploaded but awaiting second round of refereeing

Updated by Rogers, Chris about 8 years ago ยท 9 revisions