Transcript MICE -- what running strategy? reflections on steps I and II MICE Video meeting Alain Blondel 7 December 2006

MICE -- what running strategy?
reflections on steps I and II
MICE Video meeting Alain Blondel 7 December 2006
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Aspirational MICE Schedule now (date= ready to take data)
m
STEP I
15 September 2007
NB: picture does not include
target, beam line, hall infrastructure,
electronics, DAQ, shifters etc… !
November 2007
STEP II
STEP III: Winter
STEP IV
2008
Fall 2008
STEP V
Spring
2009
STEP VI
MICE Video meeting Alain Blondel 7 December 2006
Fall
2009
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STEPS I and II
m
STEP I
November 2007
Goal:
Establish beam match and
whether we have all knobs
necessary to draw
emittance vs. transmission
curve. Measure emittance
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 capability
without 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.
MICE Video meeting Alain Blondel 7 December 2006
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Step I: initial beam characterisation
Ken Long
m
-
Goals:
Commission beam line
STEP I:
STEP II:
Target
Magnetic elements
Commission
STEP III:
ToF
Cherenkov
Calorimeter?
STEP IV:
Initial survey of beam alignment and particle fluxes
Issues:
Calorimeter, but spectrometer not far behind
STEP V
STEP VI
MICE Video meeting Alain Blondel 7 December 2006
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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
first beam from target
to bend 1
to decay solenoid
?6? shifts
through DK solenoid
and to Bend 2
verify leaks, dip,
radiation etc….
need a fluo screen with
videocam
or a transportable and
operational TOF0
or…
no quads powered at
first go.
MICE Video meeting Alain Blondel 7 December 2006
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measurements at TOF0
6 shifts
will allow first meast of
through rate (negatives
first) as fn of B1, B2
max should be B1=B2
TOF0, TOF1
negatives and B1=B2 to
keep electrons and low
dipping target
3 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
misalignment
20 shifts
findout if quad is
misaligned by checking
change of av. position
vs change of current
note qads misalignments
for future realignment
obtain aligned beam
with B1=B2 after 41
shifts = 14 days.
set up cherenkov
MICE Video meeting Alain Blondel 7 December 2006
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vary B1 and B2 at the
same time to verify
momentum relation
(1 shift)
calibrate using TOF0TOF1 with electrons
begin to explore
B2.ne.B1
6 shifts
electrons should
become rare and muon
peak appear.
redo alignment with
B2=0.6 B1
2 shifts
obtain an aligned muon
beam first
measurement of beam
size in TOF1
vary optics
10 shifts
to verify that the beam
sizes are approximately
correct
total estimated beam time requested for stepI:
60 shifts = 20 days.
MICE Video meeting Alain Blondel 7 December 2006
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mStep II: Detector commissioning
-
STEP I:
Ken Long
STEP II:
Goals:
Commission detector systems:
Tracker and solenoid
Alignment, calibration
Magnet off
Pencil beam what is the requirement here?
STEP III:
2 weeks each
1 week
(I dont understand the need
for the
pencil beam
STEP
IV: … we
measure particle by particle
already)
Demonstrate beams for MICE:
here it will be critical
STEP V
to have the knobs to tune this
Demonstrate match into MICE spectrometer
how do we correct for dispersion?
quads and diffuser
STEP VI
B1 B2
another three weeks
Alignment of beam
(Lack of) dispersion
Range of transverse emittances
Range of momenta
Range of transverse emittances
Range of momenta
MICE Video meeting Alain Blondel 7 December 2006
total STEPII 7 weeks = 50 days
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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
MICE Video meeting Alain Blondel 7 December 2006
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