FF 20130409 » History » Version 3
Nebrensky, Henry, 11 April 2013 10:28
Found "missing" target
h1. FF 20130409
* Chris Rogers
* Henry Nebrensky
* John Palin
During visit to MICE hall:
* Discussion on survey data
** Survey produces xit format which appears to be proprietary binary format - requires Spatial Analyzer tool developed by New River Kinematics www.kinematics.com; DL survey crew have a licence, Jason Tarrant may also have a licence.
*** What if they go out of business?
** Each new survey results in a new xit file
*** No clear dissemination/back up policy on these files
*** Outline agreement that copies of these should be stored on MOM laptop which is backed up
*** either emailed to MOM after each survey, or MOM can put them on a USB stick before surveyor leaves RAL
** Did not discuss how survey should be documented; but documentation is probably required
** Established that the survey coordinates are either left-handed or right-handed (and a conversion is not trivial) - but not which one. Presumably this comes through from the CAD model anyway.
* Discussion on survey details
** Centre line D2-MICE-beamline
*** x-axis (D2-MICE-beamline) defined by least squares fit to quadrupole _mirror-plate_ apertures for Q4-9
*** define line-on-floor by looking at reference points on floor - brass plate under D2; floor target(sticker) in front of Q4; floor target(sticker) below the Ckovs
*** z-axis is defined by fitting to plane that includes line-on-floor and D2-MICE-beamline; and taking a line in that plane that is perpendicular to D2-MICE-beamline
** Some discussion - how do we get a handle on where D1-D2 line is pointing wrt D2-MICE-beamline?
*** Proposed measuring around solenoid exit aperture and taking the mean to get a handle on solenoid downstream end placement
**** This requires removing the Proton Absorbers and possibly GVA1; hope to do this within the pneumatic proton absorber upgrade process. Hopefully PA apertures would end up aligned on beam centre
*** No clear technique for getting the upstream end placement
*** Noted that it was not clear that the D1-D2 line sits in the x-y plane as defined above; and this should not be assumed (if possible)
** And finally
*** Emphasised that of all beamline components, TOF positions are most crucial to measure well.