mice beam diffuser
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m.apollonio MICE UK- RAL- 2/5/2007 1
MICE beam diffuserM. Apollonio ,P. Lau, W. Lau, J. Tacon, S. Yang – Univ. Oxford
m.apollonio MICE UK- RAL- 2/5/2007 2
0. Z=-6010 mm for the upstream face of the diffuser. This is a figure established long time ago (CR, CM14 Osaka - 2006)
1. radial size R as big as possible
2. thickness limited number of discs to fulfil MICE configurations
3. mechanics & control design still evolving a) new carousel wheel (to cope with high moment of Inertia) b) motors c) ideas for control (logic)
m.apollonio MICE UK- RAL- 2/5/2007 3
LEADING IDEA
trying to exploit all the radial space (15 cm) within the tin can envelope
being compatible with mechanical contraints
m.apollonio MICE UK- RAL- 2/5/2007 4
7mm 15.5cm
Emi inflation in single layer lead diffuser: 2.8 6.1 mm rad
7mm
emi(after diff)=6 mm rad
Muons selected on the overall channelideal disc
m.apollonio MICE UK- RAL- 2/5/2007 5
7mm
7mm
5cm 15.5cm
Emi inflation with a single layerof lead (small radius): 2.8 5.3 mm rad
7mm
m.apollonio MICE UK- RAL- 2/5/2007 6
7mm
7mm
5cm 15.5cm
Emi inflation in a staggered lead diffuser: 2.8 6.1 mm rad
7mm 7mm
a more realistic diffuser
fixed annulusmovable disc + support
m.apollonio MICE UK- RAL- 2/5/2007 7
emi(
R)/
emi(
R=
30
cm)
R_diffEmittance bias as a function of R_diff (partial inflation)
Pz=209 MeV/c, emi=10mm rad, B=4 T
Pz=148 MeV/c, emi=10mm rad, B=2.9 T
Pz=267 MeV/c, emi=10mm rad, B=4 T
single disc
staggered discs
m.apollonio MICE UK- RAL- 2/5/2007 810 mm
Proposal to accommodate many configurations STAGGERED/TAPERED with a fixed external annulus …just a sketch (see Peter/Joseph drawings)
24 t
o 2
7 c
m
30 c
m
trackerdiffuser
envelope
Supports (outer can/disc support): Al
Pb diffuser disc and outer annulus
1.5 to 15.5 mm
m.apollonio MICE UK- RAL- 2/5/2007 9
J. Tacon
… th
e re
al th
ing
m.apollonio MICE UK- RAL- 2/5/2007 10
= 1.4 mm radun-normalized
How many configurations we need? want? …
m.apollonio MICE UK- RAL- 2/5/2007 11
… maybe 5 discs are enough (at least to begin with)
m.apollonio MICE UK- RAL- 2/5/2007 12
New design for the main carousel:location of air-motors
m.apollonio MICE UK- RAL- 2/5/2007 13
m.apollonio MICE UK- RAL- 2/5/2007 14
0.61 T
0.32 T
0.53 T
B>= 4T
B (T)
Z (m)
R (
m)
air-motors in the magnetic field can they work ?
m.apollonio MICE UK- RAL- 2/5/2007 15
Diffuser Control Flow Chart:main cycle
Command: set disc-f for run mode
Start: go to Nf
TH empty (S off)?
Which discis in? Nd
Move C to position Nd
Extract disc
Go to empty station
Move C to position Nf
Insert disc
Go to empty station
Go to empty station
STOP
NB: need to know WHICH disc is in !
m.apollonio MICE UK- RAL- 2/5/2007 16
SUMMARY
• diffuser plates will be staggered/tapered discs of 12.5 cm diameter + outer annulus
• thicknesses nearly finalized
• some re-design of the mechanics needed
• controls in progress:• optical sensors + switch• encoding/markers (for wheel position)• air-motors + gear-boxes: possible SHOW STOPPERs !!!
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