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MICE: Constraints on the solenoids

MICE: Constraints on the solenoids. Dimensions: we decided in Chicago in February that the useful spectrometer field region should be 100 cm long and 30 cm diameter. the inner bore should be 40 cm. Field Homogeneity: 10 -2 or 10 -3 ? this will be dictated by the detector requirements.

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MICE: Constraints on the solenoids

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  1. MICE: Constraints on the solenoids • Dimensions: we decided in Chicago in February that • the useful spectrometer field region should be 100 cm long and 30 cm diameter. • the inner bore should be 40 cm • Field Homogeneity: 10-2 or 10-3 ? • this will be dictated by the detector requirements. • TPG will be more demanding (uses the field actively as guide for drift) • => STUDY to be made! • 3. Matching: • MICE should be magnetically transparent. • This requires a matched magnetic system for a certain number of configurations • availability of the corresponding KNOBS • Movable elements 4. WHICH CONFIGURATIONS? Personal thoughts……..for discussion:

  2. 10% cooling of 200 MeV muons requires ~ 20 MV of RF single particle measurements => measurement precision can be as good as D ( e out/e in ) = 10-3 SC Solenoids; Spectrometer, focus pair, compensation coil Liquid H2 absorbers or LiH ? 201 MHz RFcavities T.O.F. I & II Pion /muon ID precise timing Tracking devices: He filled TPC-GEM (similar to TSLA R&D) and/or sci-fi Measurement of momentum, angles and position T.O.F. III Precise timing This is FINAL MICE !! Electron ID Eliminate muons that decay

  3. 10 m STEP I: we get the muon beam In this first phase we define the beam tunings, composition, settings for both mu+ and mu- as a function of momentum. needed: beam (!) TOF, trigger some DAQ two SCI FI arrays or beam chambers PID

  4. - + and Step II: the first solenoid arrives, the tracker arrives a few weeks later. In this step we 1. turn on and map the first solenoid 2. study the acceptance and the required thickness of the diffusers 3. debug the Tracker 4. verify the matching of TPG with Sci-fi or beam chamber 5. debug track identification devices 6. (MEASURE BEAM EMITTANCE IN SOLENOID!) needed: solenoid and all services magnetic measurement system tracking devices

  5. ? - + do we need Step III: TWO spectrometers At this step we: -- Turn on and map the second solenoid -- Debug Spectrometer # 2 -- Measure ein, eout and the ratio -- Field reversal is important for E ^ B effects + + - - and THIS IS A VERY IMPORTANT STEP : THESE RESULTS WILL BE PART OF THE FINAL ONES (Systematics on ein/ eout ) -- can insert a number of materials to measure e.g. dE/dx vs scattering angle correlation

  6. Step III- B: TWO spectrometers -- can insert a number of materials to measure e.g. dE/dx vs scattering angle correlation At this point we might want to bring in an absorber and measure its properties in this simpler configuration + +

  7. Step IV: TWO spectrometers and the LH2 absorber At this step we: -- Turn on and map the flip pair -- Match the system -- Measure ein, eout and the ratio -- for full AND empty absorber. -- for ++ AND +- configuration + - or + +

  8. Step V: first cooling cell At this step we: -- Turn on and map the flip pair -- Match the system -- Measure ein, eout and the ratio -- for full AND empty absorber. -- for ++ AND +- configuration + + with flips or + without flips +

  9. Step VI: low beta study See; Palmer – Fernow Note – or talk at the October 2001 Workshop at CERN. Limit is: current X 2 in flip coils and zero in coupling coil.

  10. Step VI: low beta study + + with flips this has to be completely re-matched…. and re-mapped! Quite an operation…

  11. Other momenta? MICE could certainly map the acceptance as a function of beam momentum for a given magnetic setting. Off-nominal-momentum performance may be sub-optimal (?). Should we try MICE matched for lower/higher momentum as well? more/less cooling!

  12. Step VII The full two-cell MICE ibid. sensitivity will be better since volts will be higher. can try various settings of polarities and absorbers (full / empty) and of absorber thicknesses (to match available RF or beam momentum)

  13. Preliminary conclusions for discussion • It will be necessary to have enough knobs • to vary the magnetic configuration to adapt to the various avatars of MICE • The various components of the magnetic channel will have to move • along the experiment • 3. There will be a lot of magnetic measurements to do! (I must have been a mice (sorry, mouse) in one of my previous lives)

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