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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

slide9
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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