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Analysis of Beam Simulations for Muon Cooling at CERN (February 2007)

This report details the results from simulations conducted at CERN's CM17 facility from February 22 to 25, 2007. Utilizing ICOOL, G4BeamLine, and Turtle transport methods, two primary beams of muons were analyzed, featuring approximately 2900 and 5140 muons with momenta around 206 MeV/c and 209 MeV/c respectively. The study investigates key parameters such as beam emittance, cooling efficiency, and optics transmission. Findings indicate the need for further investigation due to some unexpected performance metrics in recovery and cooling optics.

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Analysis of Beam Simulations for Muon Cooling at CERN (February 2007)

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  1. ISIS beam to MICE: ICOOL simulation M. Apollonio – University of Oxford CM17 -CERN- (22/2/-25/2/2007)

  2. two beams from Kevin T. (Turtle/Transport) • (sept 2006): • ~2900 muons • <P> ~ 206 MeV/c, s(Pz)/Pz ~0.7% • Initial emi = 6.5 mm rad • (2006): • ~5140 muons • <P> ~ 209 MeV/c , s(Pz)/Pz~ 5% • Initial emi = 7.5 mm rad • one beam from Kenny W. (G4BeamLine) • (2006): • ~ 1900 muons • <Pz> ~210 MeV/c • Initial emi ~ 6 mm rad • propagate through the channel and study emittance, momentumrecovery, optics (beta, alpha) and transmission Beam transported after the diffuser to Z=-5.201m (i.e. ~centre of 1st tracker) Beam transported after the diffuser to Z=-4650m CM17 -CERN- (22/2/-25/2/2007)

  3. s (Pz) ~ 3.8 MeV/c Pz (MeV/c) s (P) ~ 1.4 MeV/c Px (MeV/c) Py (MeV/c) P (MeV/c) s (Px,Py) ~ 30 MeV/c KT – narrow beam CM17 -CERN- (22/2/-25/2/2007)

  4. s (x,y) ~ 3.5 cm x (m) Y (m) y (m) x (m) x (m) CM17 -CERN- (22/2/-25/2/2007)

  5. s (Pz) ~ 12 MeV/c Pz (MeV/c) s (P) ~ 12 MeV/c Px (MeV/c) Py (MeV/c) P (MeV/c) s (Px,Py) ~ 31 MeV/c KT – broad beam CM17 -CERN- (22/2/-25/2/2007)

  6. s (x,y) ~ 3.5 cm x (m) Y (m) y (m) x (m) x (m) CM17 -CERN- (22/2/-25/2/2007)

  7. Z=-5.201 m (Turtle) Turtle or G4BL sim ICOOL sim Z=- 4650 m (G4BL) diffuser Z=-6.010 CM17 -CERN- (22/2/-25/2/2007)

  8. KT – narrow beam CM17 -CERN- (22/2/-25/2/2007)

  9. KT – narrow beam BZ (T) ICOOL start diffuser <Pz> (GeV/c) Dp/p ~ -6% e (m rad) De/e ~ -13% CM17 -CERN- (22/2/-25/2/2007) Z (m)

  10. small matching problem T ~ 98% b (m) KT – narrow beam a CM17 -CERN- (22/2/-25/2/2007) Z (m)

  11. KT – broad beam CM17 -CERN- (22/2/-25/2/2007)

  12. BZ (T) KT – broad beam <Pz> (MeV/c) Dp/p ~ -6% e (m rad) De/e ~ -14% CM17 -CERN- (22/2/-25/2/2007) Z (m)

  13. T ~ 96% b (m) KT – broad beam a CM17 -CERN- (22/2/-25/2/2007) Z (m)

  14. expected cooling in LH De/e=Dp/p*(1-eeq/e) eeq (LH)= 1.68 mm CM17 -CERN- (22/2/-25/2/2007) e (cm rad)

  15. KW – G4 beam CM17 -CERN- (22/2/-25/2/2007)

  16. ? CM17 -CERN- (22/2/-25/2/2007)

  17. P-recovery cooling optics transmission KT turtle narrow OK OK b 98 % broad OK OK b 96 % KW G4BL So so … BAD b 37% Conclusions Need more investigation CM17 -CERN- (22/2/-25/2/2007)

  18. -- END -- CM17 -CERN- (22/2/-25/2/2007)

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