Presentation on theme: "MICE Video meeting Alain Blondel 7 December 2006 1 MICE -- what running strategy? reflections on steps I and II."— Presentation transcript:
MICE Video meeting Alain Blondel 7 December 2006 1 MICE -- what running strategy? reflections on steps I and II
MICE Video meeting Alain Blondel 7 December 2006 2 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
MICE Video meeting Alain Blondel 7 December 2006 3 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 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. Goal:Establish beam match andwhether we have all knobsnecessary to drawemittance vs. transmissioncurve. Measure emittance
MICE Video meeting Alain Blondel 7 December 2006 4 Step I: initial beam characterisation Goals: Commission beam line Target Magnetic elements Commission ToF Cherenkov Calorimeter? Initial survey of beam alignment and particle fluxes Issues: Calorimeter, but spectrometer not far behind Ken Long
MICE Video meeting Alain Blondel 7 December 2006 5 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? shifts through 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.
MICE Video meeting Alain Blondel 7 December 2006 6 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 7 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.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 8 Step II: Detector commissioning Goals: Commission detector systems: Tracker and solenoid Alignment, calibration Magnet off Pencil beam what is the requirement here? Demonstrate beams for MICE: Alignment of beam (Lack of) dispersion Range of transverse emittances Range of momenta Demonstrate match into MICE spectrometer Range of transverse emittances Range of momenta Ken Long 2 weeks each 1 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 diffuser B1 B2 another three weeks total STEPII 7 weeks = 50 days
MICE Video meeting Alain Blondel 7 December 2006 9 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