Tracking code development for FFAGs

1
Tracking code development for FFAGs

• S. Machida
• ASTeC/RAL
• 2 November, 2005
• http//hadron.kek.jp/machida/doc/nufact/
• ffag/machida_021105.ppt pdf

2
Longitudinal acceptance
b0.25
b0.20
b0.10
b0.15
Each line is trajectory starting from (0,dp/p),
where dp/p is every 0.01 step.
3
Emittance evolution
Less tilted (-50).
Initial ellipse is tilted as about the same slope
of separatrix.
More tilted (50).
4
Summary

• Momentum acceptance is higher with less b
  parameter. With b0.2, dp/p-0.05 is achieved.
  It is still a bit less compared with
  ShaneEberhard calculation (dp/p-0.06).
  However, that may be attributed to the different
  models, one is analytic with symmetric TOF
  parabola, and the other is brute force
  integration.
• Longitudinal bunch with lt-0.1ns and dp/p0.025
  are accelerated with tilted initial ellipse.