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Cooling channel issues. U. Bravar Univ. of Oxford 31-Mar-2004. MICE channel plots. G4MICE requirements. What needs to be done to make these plots: Virtual planes user defined z-location Interface with ecalc9f to calculate e n Standard input beam to achieve De/e @ 15%.

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Cooling channel issues

Cooling channel issues

U. Bravar

Univ. of Oxford

31-Mar-2004



G4mice requirements
G4MICE requirements

What needs to be done to make these plots:

  • Virtual planes

    user defined z-location

  • Interface with ecalc9f

    to calculate en

  • Standard input beam

    to achieve De/e @ 15%


Input beam
Input beam

  • Define one standard

    (e.g. e^ = 6,000 mm mrad & b^ = 33 cm, start in middle of upstream spectrometer)

  • Save generated beam in file

  • Beam defined as x-px, rather than x-x’

  • Place coils upstream of first tracker

  • Replace `beta = 420’ in G4MICE default

  • (Ability to software-select desired beam in upstream spectrometer)


Why do we need a standard
Why do we need a standard?

Example:

  • Study of coil misalignment tolerances.

    Results depend on the following quantities:

  • Input beam

  • Emittance calculation

  • Channel geometry

  • Channel optics

  • RFs


Mice magnetic field
MICE magnetic field

  • MICE proposal lists six different current sets in Table 3.3

  • Plus, want to simulate no-flip and semi-flip modes

    G4MICE present capabilities:

  • One default set of currents

  • Cannot do semi-flip (card FieldFlipOption)

  • Cannot change currents coil-by-coil

  • Cannot run MICE Stage III (card NumberOfCoolingCells)

    Improvements:

  • Have a set of coils and several currents available in data cards

  • Enable current definitions coil-by-coil

  • (Use G4MICE to optimize MICE channel optics)


Channel optics
Channel optics

  • Use G4MICE to optimize channel optics

  • Three steps:

    i) fix currents in FC & CC to achieve desired b^ in LH

    ii) fix currents in EC & solenoid to achieve desired B in tracker

    iii) fix currents in MC to achieve constant b^ in tracker


Geometry alignment
Geometry & Alignment

  • Obvious stuff:

    i) Actual shape for Al windows…

    ii) Local variations in LH density (convection)

    iii) Stay-clear area

  • Ability to displace every element in the MICE channel

    i) by fixed amount

    ii) random displacements


RFs

  • Data card for static electric field

  • Data card for on-crest & off-crest

  • W-shaped cavities

  • RF phase:

    i) leading particle method

    ii) define phase RF-by-RF

  • Bf field produced by RFs


G4mice output
G4MICE output

  • Currently we have:

    i) x,y,z,px, py, pz,t at fixed z (MC & Rec.)

    ii) two z-locations (one in each tracker)

  • Add:

    i) particle coordinates and momenta at fixed time

    (time is obtained from RF phase)

    ii) B-field and E-field

    iii) vector potential A

  • Insert:

    i) virtual planes, at any z along the channel, user’s choice

    ii) z-reference plane in upstream and downstream tracker


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