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Sensitivity Analysis of MICE Beam Parameters and Cooling Performance

This study presents initial results from the MICE experiment's analysis meeting held on January 26, 2010. We explore the sensitivity of the MICE cooling system to various input beam parameters, utilizing simulations of 5000 events with a Step VI geometry and B-field map. Key findings demonstrate that cooling performance is highly dependent on initial parameters, revealing a 10% cooling at 1 MeV/c and 5% heating at 20 MeV/c. Moreover, our findings suggest that the RF gradient significantly impacts cooling effectiveness, indicating deviations from expected behavior based on ideal cooling equations.

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Sensitivity Analysis of MICE Beam Parameters and Cooling Performance

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  1. Beam Parameter Study (2) Timothy Carlisle University of Oxford

  2. Intro • Initial results presented in Analysis Meeting 26/1/10 • Studying MICE sensitivity to input beam parameters

  3. Data Selection • All simulations use: • 5000 events, Step VI geometry + B-field map • 50 virtual planes • All emittance calculations use: • Muons that survive the channel • Fixed Cuts: • AmpSq > 135 mm - Tracker acceptance • AmpL > 0.3 ns – lost from bunch • 16*AmpSq & 8*AmpL cuts Remove outlying events

  4. Step VI Performance (sPz) • Cooling strongly dependent on initial sPz • At ei=3mm: • 10% cooling at 1 MeV/c • 5% heating at 20 MeV/c

  5. Step VI Performance (RF) Step V MICE note 265: Effect of Reduced RF Gradient on MICE Cooling Performance C. Rogers

  6. Beta Function

  7. Av. Energy(z)

  8. Beta Function Problem • ~ 33cm in tracker BUT: • Minima not located at absorbers (±2.75m,0m) • 42cm at LH2 • Expect peaks of ~ 110cm Simulation set-up?

  9. Conclusions • MICE performance appears sensitive to • RF Gradient – ~ agrees with Chris (note 265) • Initial sPz • Important departure from behaviour expected by the [idealised] cooling equation. • What can we consider a standard/reasonable output beam from the Beamline?

  10. TRD Beta Fn. Red – ICOOL, Blue – predicted from evolution equations

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