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CM31: Step V.0

CM31: Step V.0. Timothy Carlisle University of Oxford. Life after Step IV. No Coupling Coil...?. Step V.0 Operating Modes. FCs share the same power supply (|J FC |) Can flip sign different running modes for Step V.0? Match Coils also tuneable (M1,2). +. -. -. +. Flip Mode.

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CM31: Step V.0

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  1. CM31: Step V.0 Timothy Carlisle University of Oxford

  2. Life after Step IV... No Coupling Coil...?

  3. Step V.0 Operating Modes • FCs share the same power supply (|JFC|) • Can flip sign • different running modes for Step V.0? • Match Coils also tuneable (M1,2) + - - + Flip Mode Bz[T] z[m]

  4. Other possibilities: Bz[T] Solenoid Mode: + + + + Seesaw Mode: + + - - Battery Mode: + - + - Bz[T] Bz[T]

  5. Matching Step V.0 • Want operating currents for FC & M1,2 • Evolve Beta Fn. through MICE with: • Minimize: • Match beam between FCs Find • Match beam from solenoid  Find • Tune MICE optics for all modes. • Ignore current limits for now. 1st FC centre 2nd FC centre b[cm] z[m]

  6. Flip Mode (1 – F) • Use Minuit to search parameter space • Minima in two distinct regions. JFC [A/mm2] b0 [cm]

  7. Solutions • Battery Mode not discussed any further  Flip Mode better. (J in units of A/mm2)

  8. Flip Mode – 4T • High & low bsols. b[cm] Bz[T] z[m] z[m]

  9. Scaled Solutions Matching Condition • However: |JFC|<140 & |JM1,2|<160 • Options: 1) Scale down all coil currents • 3 T in SS, reduce pz  bin = 33.3cm 2) Scale down FC & M1, M2. • Run at 4T in SS, reduce pz bin reduced.

  10. 1) Scale down all coil currents b[cm] Flip 3T b0 = 76 cm solution z[m] Bz[T] pz= 136 MeV/c no material z[m]

  11. 2) Scale down onlyFC & M1,2 b[cm] Flip 4T b0 = 76 cm solution z[m] Flip Mode: + - - + pz= 123 MeV/c no material Bz[T] b0~ 76 cm JFC=76.284 JM1=125.66 JM2=149.80 z[m]

  12. Step V.0: Modes (scaled) Limiting parameter underlined

  13. Step V.0 in G4MICE Flip 3T b0= 76 cm sol. e = 3mm spz=1 MeV/c b[cm] emittance[mm] z[m] z[m] pz= 136 MeV/c no material

  14. Step V.0 in G4MICE Flip4T b0= 10 cm sol. e = 3 mm spz=1 MeV/c b[cm] emittance[mm] z[m] z[m] pz= 113 MeV/c no material

  15. Step V.0 in G4MICE Flip4T b0= 76 cm sol. e = 3 mm spz=1 MeV/c b[cm] emittance[mm] z[m] z[m] pz= 136 MeV/c no material

  16. Summary • Step V.0 – RF without the Coupling Coil. • Matched solutions found for Step V.0 in Flip Mode. • Evolve beam envelope eqns(on axis beams) • Requirepz < 140 MeV/c • Too low? • Not matched with “real” beams in G4MICE • Non-linear effects wreck matching • Alternative matching techniques? • Step V.0 a non-starter at present

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