MICE analysis meeting - (26/3/2006) 1 Update on MICE – step III M. Apollonio – University of...
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MICE analysis meeting - ( 26/3/2006) 1 Update on MICE – step III M. Apollonio – University of Oxford
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Transcript of MICE analysis meeting - (26/3/2006) 1 Update on MICE – step III M. Apollonio – University of...
MICE analysis meeting - (26/3/2006)
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Update on MICE – step IIIM. Apollonio – University of Oxford
MICE analysis meeting - (26/3/2006)
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Investigate emittance growth
Optmize thickness for absorbers
tested emittance growth for LiH (2 absorbers) with
thinner absorbers
MICE analysis meeting - (26/3/2006)
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parameters used in simulation Pz=207 MeV/c with a spread of 10% initial emittances ranging from 0.1 to 1.0 (cm rad) 10000 generated muons per point (i.e. initial emittance) lost muons: worse cases at high initial (=1.0 cm rad)
4% (LiH, C, non flip mode)
3% (C, flip mode)
MICE analysis meeting - (26/3/2006)
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Fli
p m
od
e: 2
ab
sorb
ers
LiH, Li, Be, CH, C
2x7cm absorbers = 13% pz reduction
0.22, 0.26, 0.39, 0.4, 0.57 (cm rad)
MICE analysis meeting - (26/3/2006)
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net d/ after the absorbers
current optimizationschemes:
evbeta+MINUIT
ICOOL+MINUIT
ICOOL+MINUITwith 2 absorbers
equilibrium
asymptoticcooling
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Flip mode: 2 absorbers of LiH Variable thickness (2x3cm, 2x4cm, … )
2x4 cm2x3 cm
MICE analysis meeting - (26/3/2006)
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Flip mode: 2 absorbers of LiH Variable thickness (… 2x5cm, 2x6cm )
2x3 cm2x5 cm
MICE analysis meeting - (26/3/2006)
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Flip mode: 2 absorbers of LiH Variable thickness (2x3cm, 2x4cm, 2x5cm, 2x6cm)
EMI=1.0EMI=1.02x3cm 2x4 cm
MICE analysis meeting - (26/3/2006)
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Flip mode: 2 absorbers of LiH Variable thickness (2x3cm, 2x4cm, 2x5cm, 2x6cm)
EMI=0.5EMI=0.5 2x3cm 2x4 cm
MICE analysis meeting - (26/3/2006)
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2x7cm =-13%2x6cm =-11%2x5cm =-9.2%2x4cm=-7.2%2x3cm=-5.4%
Summary P
lot
MICE analysis meeting - (26/3/2006)
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Summary tried to reduce the thickness of the absorbers confirmed the behaviour already shown at dp/p=-13% great discrepancy with the simple model (see slide 5) emittance re-growth in the central region
Side communication started working on the G4MICE for stepIII thanks to Chris for his modifications of the code The stepIII channel is available but currents are to be changed to the values
I found in ICOOL optimization Work in progress
MICE analysis meeting - (26/3/2006)
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(%)
(cm rad)
(cm rad)
new set of data:more points (see next slides)
Non Flip Mode
+2.8 %
+2.3 %
Flip Mode
