1 STEP III MICE Analysis Workshop RAL – 4/9/2008 m. apollonio, IC.

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Presentation transcript:

1 STEP III MICE Analysis Workshop RAL – 4/9/2008 m. apollonio, IC

2 def: two tracker solenoids & no RFs & LiH absorber inserted in between a) STEP III was thought as an intermediate stage to calibrate the trackers, the main assumption being  upstream =  downstream b) a possibility is using STEPIII to show a first effect of cooling [MA, JC CM14, Osaka 2006] however first studies showed that assumption (a) is naïve and cooling in (b) is not exactly how you would expect

3  i =0.1 cm rad  i =0.2 cm rad  i =0.3 cm rad  i =0.6 cm rad  i =1.0 cm rad emittance growth in vacuum: NO ABSORBERS

4 Non Flip Mode Flip Mode +2.8 % +2.3 % in vacuum

5 how can it be? there is no reason to violate Liouville’s theorem (Hamiltonian System), however: a)little mismatch due to non-paraxial beams (at higher emittances) b)non-linear forces  phase space does not transform linearly

6 xx linear transformation NON-linear transformation effective EMITTANCE

7 phase space density for low SPA regions  much less sensitive to tails equilibrium vacuum growth subtracted emi. % variation