M.apollonioMICE Analysis meeting 23/1/20071 M. Apollonio – University of Oxford Radius of diffuser and sizes for PID.

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Presentation transcript:

m.apollonioMICE Analysis meeting 23/1/20071 M. Apollonio – University of Oxford Radius of diffuser and sizes for PID

m.apollonioMICE Analysis meeting 23/1/20072 Let’s consider different optics for MICE Consider the maximum radius a particle can reach in the tracker (TK) = 15 cm the absorber (ABS) = 15 cm the RF windows (RF) = 21.3 cm It can be shown that  ~ Propagate the radius throughout MICE according to These curves represent the ENVELOPE of the beam which just touches the TK, the ABS, the RF and the diffuser == muons with a given amplitude == MAX size of diffuser MAX radii in the downstream region CAVEAT: field in the downstream region is approximate, neglecting the presence of the shield!!!

m.apollonioMICE Analysis meeting 23/1/20073 current diffuser position ideal minimum R D

m.apollonioMICE Analysis meeting 23/1/20074 Wang Z-downstream: shield-in shield-out SW TOF KL

m.apollonioMICE Analysis meeting 23/1/20075 current diffuser position  inside TKs  inside ABS  inside RF ideal minumum R D Every  in the TKs will traverse both ABS and RF R D must be as large as possible 10 cm is definitely too small !!!

m.apollonioMICE Analysis meeting 23/1/20076 Wang (with energy loss) R grows linearly far from the solenoid (beta ~ z 2 )

m.apollonioMICE Analysis meeting 23/1/20077 Wang

m.apollonioMICE Analysis meeting 23/1/20078 Wang

m.apollonioMICE Analysis meeting 23/1/20079 NF

m.apollonioMICE Analysis meeting 23/1/ NF

m.apollonioMICE Analysis meeting 23/1/ SFOFO

m.apollonioMICE Analysis meeting 23/1/ SFOFO

m.apollonioMICE Analysis meeting 23/1/ SFOFO-140-7

m.apollonioMICE Analysis meeting 23/1/ SFOFO-140-7

m.apollonioMICE Analysis meeting 23/1/ Summary of min R – DIFFUSER (cm)

m.apollonioMICE Analysis meeting 23/1/ Definition of MIN Radius for PIDs and SHIELD holes !!! NOT IN SCALE (but figures should be correct) TOF KL SW max radius 800

m.apollonioMICE Analysis meeting 23/1/ According to the defs given in previous slides these are the min radii (a) for the shield (to let every  pass) and (b) for the PIDs (to accept every  ) Within tolerances 1000x1000 mm 2 600x x700 mm 2 Slightly out ? tolerances Is it a problem?

m.apollonioMICE Analysis meeting 23/1/ Wang Z-downstream: shield-in shield-out SW TOF KL like having a 20 cm shorter SW calorimeter But only for the outer muons

m.apollonioMICE Analysis meeting 23/1/ conclusions the maximum radii for particles traversing MICE are propagated (from the max R in 3 different places) through the apparatus (TKs, ABS, RF) Considering several optics: min Radius (at fixed position z=-6150 mm) for the diffuser is defined: in order to have particles in the TKs it turn out Rd should be as large as possible (compatible with mechanical contraints) In any case RD=10 cm is too small ! min radii for downstream shield holes are computed upon the requirement of accepting every  from trackers min radii for PIDs are computed upon the requirement of having the maximal acceptance within the detector: this condition can be probably relaxed Real B field in the “shield area” should take into account real map. This is just an approximation whose purpose is giving some initial figures