isis-mice tgt alignment m. apollonio ic
DESCRIPTION
ISIS-MICE TGT alignment m. apollonio IC. p urpose: understand sources of reduced rate comment: probably a 2 nd order effect CAVEAT: result still preliminary, need a thorough check Please DON’T use them in your simulations !!!. CAVEAT: used old drawings Author: MJK CLRC 2006 - PowerPoint PPT PresentationTRANSCRIPT
MICE Beam Line PC - 031008 1
ISIS-MICE TGT alignmentm. apollonio IC
purpose: understand sources of reduced ratecomment: probably a 2nd order effect
CAVEAT: result still preliminary, need a thorough checkPlease DON’T use them in your simulations !!!
MICE Beam Line PC - 031008 2
486.05
CAVEAT: used old drawings Author: MJKCLRC 2006 Plus some info from Note 216
MICE Beam Line PC - 031008 3
1.76o
Q4-point-1
Q4-point-6
Inclined_Frame_2
Inclined_Frame_1
Inclined_Frame_3
MICE Beam Line PC - 031008 4
“nominal” target bottom tip
ISIS CLUsed 67.1-42.6=24.5
Where is the actual intersection of Q-pole axis with tgt plane?
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-16000 -15500 -15000 -14500 -14000 -13500 -13000 -12500 -12000
-22700
-22500
-22300
-22100
-21900
-21700
projected trajectory [x-y]
target tip nominal point
x
y
NB coordinates represented in the ISIS frame
Q1
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-16000 -15500 -15000 -14500 -14000 -13500 -13000 -12500 -12000
-600
-580
-560
-540
-520
-500
-480
-460
-440
-420
-400
projected trajectory [x-z]
traget tip nominal point
x
z
-578.5
35.42.6
~15.
MICE Beam Line PC - 031008 7
-22700 -22600 -22500 -22400 -22300 -22200 -22100 -22000 -21900 -21800 -21700
-600
-580
-560
-540
-520
-500
-480
-460
-440
-420
-400
projected trajectory [y-z]
target tip nominal point
y
z
MICE Beam Line PC - 031008 8
“nominal” target bottom tip
ISIS CL 24.5
... here
3.046o
3.332o
256. ~15.
... a visual answer
MICE Beam Line PC - 031008 9
CONCLUSIONS with a caveat
- from this preliminary study a misalignment is noticed which correspond to an angle of 0.286o : it is the angle by which the bottom tip of the target (at its lowest point) sees the entrance of Q1
- how important is this to pion collection at the 1st Q-pole? - my gut feeling says: not relevant- the real answer should rely on a MC simulation
- I used an old reference (1st survey by CCLRC) because I think I understand the drawings. Also partly used info from note 216, but I found it a bit more difficult to understand. So I want to have the latest figures and re-calculate the axis of the q-poles towards the target plane
- before launching yourself into simulations let me be convinced of the numbers