Upload
edmund-randall
View
219
Download
0
Embed Size (px)
Citation preview
1MICE Video meeting Alain Blondel 7 December 2006
MICE -- what running strategy?
reflections on steps I and II
2MICE Video meeting Alain Blondel 7 December 2006
Aspirational MICE Schedule now (date= ready to take data)
15 September 2007 NB: picture does not include target, beam line, hall infrastructure, electronics, DAQ, shifters etc… !
STEP I
November 2007
STEP III: Winter 2008
STEP II
STEP IV Fall 2008
STEP V Spring 2009
STEP VI Fall 2009
3MICE Video meeting Alain Blondel 7 December 2006
STEPS I and II
STEP I
November 2007
Unfortunately it seems unlikely that we will be able to have the SW calorimeter for october 2007.
This would have allowed to have significant energy measurement (total charge deposited) and particle ID capabilitywithout SW calorimeter we are left with only TOF in stepI
As soon as we have the spectrometer solenoid the problem no longer exists, the tracker will provide momentum measurement.
Goal: Establish beam match andwhether we have all knobs necessary to draw emittance vs. transmission curve. Measure emittance
4MICE Video meeting Alain Blondel 7 December 2006
Step I: initial beam characterisation
Goals:Commission beam line
TargetMagnetic elements
CommissionToFCherenkovCalorimeter?
Initial survey of beam alignment and particle fluxes
Issues:Calorimeter, but spectrometer not far behind
STEP I:
STEP II:
STEP III:
STEP IV:
STEP V
-
STEP VI
STEP I:
STEP II:
STEP III:
STEP IV:
STEP V
--
STEP VI
Ken Long
5MICE Video meeting Alain Blondel 7 December 2006
STEPI
1. running in of the beam line. This assumes that all magnet polarities and fields have been tested by powering during the shut down
2. it is suggested to run-in with negative polarity. (only electrons and negative pions to simplify pile-up in TOF0)
3. it is assumed that TOF0 and TOF1 are complete, so that a resolution of 4cm/sqrt(12)= 1.3cm is available for each particle in both directions.
target running in ?6? shifts
verify leaks, dip, radiation etc….
first beam from target to bend 1 to decay solenoid ?6? shiftsthrough DK solenoid and to Bend 2
need a fluo screen with videocam or a transportable and operational TOF0 or… no quads powered at first go.
6MICE Video meeting Alain Blondel 7 December 2006
measurements at TOF06 shifts
will allow first meast of through rate (negatives first) as fn of B1, B2max should be B1=B2
TOF0, TOF1 negatives and B1=B2 to keep electrons and low dipping target3 shifts
will allow verification of TOF time calibration and verification of beam alignment on TOFs. positions of TOFs
scan beam dipoles for alignment and quadrupoles for misalignment20 shifts
findout if quad is misaligned by checking change of av. position vs change of currentnote qads misalignments for future realignment
obtain aligned beam with B1=B2 after 41 shifts = 14 days.
set up cherenkov
7MICE Video meeting Alain Blondel 7 December 2006
vary B1 and B2 at the same time to verify momentum relation(1 shift)
calibrate using TOF0-TOF1 with electrons
begin to explore B2.ne.B16 shifts
electrons should become rare and muon peak appear.
redo alignment with B2=0.6 B12 shifts
obtain an aligned muon beam first measurement of beam size in TOF1
vary optics10 shifts
to verify that the beam sizes are approximately correct
total estimated beam time requested for stepI: 60 shifts = 20 days.
8MICE Video meeting Alain Blondel 7 December 2006
Step II: Detector commissioning
Goals:Commission detector systems:
Tracker and solenoidAlignment, calibration
Magnet offPencil beam what is the requirement here?
Demonstrate beams for MICE:Alignment of beam(Lack of) dispersionRange of transverse emittancesRange of momenta
Demonstrate match into MICE spectrometer
Range of transverse emittancesRange of momenta
STEP I:
STEP II:
STEP III:
STEP IV:
STEP V
-
STEP VI
STEP I:
STEP II:
STEP III:
STEP IV:
STEP V
--
STEP VI
Ken Long
2 weeks each1 week
(I dont understand the need for the pencil beam … we measure particle by particle already)
here it will be critical to have the knobs to tune this
how do we correct for dispersion?quads and diffuserB1 B2 another three weeks
total STEPII 7 weeks = 50 days
9MICE Video meeting Alain Blondel 7 December 2006
This is very preliminary and should be looked at by others. It looks as if the running in of MICE stepI and II will require
about 70 days of beam time