MICE -- what running strategy?

1MICE Video meeting Alain Blondel 7 December 2006

MICE -- what running strategy?

reflections on steps I and II


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


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


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


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.


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


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.


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


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

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MICE -- what running strategy?