Download - MICE Beamline Status
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MICE Beamline Statusm. apollonio
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Goals of the BeamLine (and possible actions for improvement)
- Generate PIONS (TGT)- increase dip depth - maximise production / capture in 1st triplet
-Transport PI to DK solenoid- effects of varying DKSol current
- Capture Decay MUs (NB: backward == high purity)
- Transport MU to diffuser
- Match beam with (future) MICE lattice
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D1
D2 Q4
Q1
Q2
Q3
Q5 Q6 Q7 Q8 Q9317 December 2009 MICE VC 127 3
TOF2
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f1
f2
GVA1
Q1 Q3-Q2
F x (Q1-Q2-Q3)
Q1-2-3 scan (past run)
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Upstream Beam-line
Target
ISIS synchrotron
Q1
D1
Q2Q3
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• Q1-2-3 varied from nominal value
• Charged particles counted downstream of DKsolenoid
• Compared to MC – Charged – -, -, e-
• predict effect for single current changes
• verify in the next run
• DATA (Friday 13th 2009!)
nominal config.
data
MC
charged-
-
e-
Q1-Q2-Q3 scan – US beamline optimisation
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nominal config.
data
MC
-
-
e-
f1-only (MC) DATA• Q1 scan
Q1-Q2-Q3 scan – US beamline optimisation
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nominal config.
data
MC
-
-
e-
f2-only (MC) DATA
• Q2 scan
Q1-Q2-Q3 scan – US beamline optimisation
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Q1-Q2-Q3 scan – US beamline optimisation
• Q3 scan
nominal config.
data
MC
-
-
e-
f3-only (MC) DATA
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Muon BeamLine: G4BL simulation – Q1.DS + ------------ CALC_EMI ------------- + T= 0.196 mm rad x = 4.77 cm Y = 4.55 cm T = 38397 mm T = -7.105 RADIUS = 86.73 mm x= 0.2448 mm rad x = 32146 mm x= 9.68 x= 0.074 mm rad y= 0.1568 mm rad y = 45755 mm y= -32.9 y= 0.047 mm rad
P=444.71 MeV/c Z=Q1DS
X’ vs X Y’ vs Y
Y vs X
mmmm
rad
rad
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Muon BeamLine: G4BL simulation – TOF0
Y vs X P/P<10%
P/P|>10%
+ ------------ CALC_EMI ------------- + N= 2.91 mm rad X = 4.51 cm Y = 7.02 cm = 2874.8618 mm = 0.129 RADIUS = 91.4828342 mm x= 3.49 mm rad x= 1400.4 mm x= 0.489 eX=1.47 mm rad y= 2.43 mm rad y= 4867.7 mm y= -0.392 eY=1.02 mm rad
X’ vs X
Y’ vs Y
P=250 MeV/c Z=TOF0
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Muon BeamLine: G4BL simulation – TOF1
+ ------------ CALC_EMI ------------- + N= 2.47 (mm rad) X = 5.9 (cm) Y = 4.37 (cm) T = 2334 (mm) T = 0.86 RADIUS = 75.9 (mm) x= 2.60 x= 2872 mm x= 1.598 y= 2.35 y= 1727 mm y= 0.039
P=223 MeV/c Z=TOF1
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Y vs X P/P<10%
P/P|>10%
X’ vs X
Y’ vs Y
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DKSol SCAN
- Rationale- Change DK current change optics downstream DKSol- handle for tuning- check data vs MC (our understanding of BL)- ongoing task (unfinished …)
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DATA Run 1125 (PI+) Ptgt = 336.85 - PD2 = 330.9 MeV/c DKSol = 679A = 3.9T (+0.74T)
RUN 1125 DATA (DKSOl SCAN)
slab hits …
~8300 entries ~12000 entries
protons?
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beam line- Rationale
- select u.s. of DKSol with D1- select d.s. of DKSol with D2
- back scattered muons == purity
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Q4Q1
Dip
ole1
DK solenoidQ2 Q3
Dip
ole2
Q5 Q6 Q7 Q8 Q9
d.s. BL tuning: match to diffuser
P=444 MeV/c
fix D1 fix D2
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Optimising the BL – match to diffuserThis is the (e,P) matrix
http://mice.iit.edu/bl/MATRIX/index_mat.html 1717 December 2009 MICE VC 127
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17 December 2009 MICE VC 127 18 190 350
Pdiff = 148 215 256
Ppi (tgt) = 350
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Will it work?
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RUN 1174-1177 – PI- (444MeV/c) MU- (256 MeV/c) at D2
~29.
NB: DTmu(256)= DTmu(300) * beta300/beta256 = 28.55 * .943/.923 = 29.13
0.943269
0.943269
PI- should be here: 30.44
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?RUN 1201 – PI- (336.8MeV/c) MU- (256 MeV/c) at D2
PI- should be here: 30.44
MU- should be the same asbefore … what is that?17 December 2009 21MICE VC 127
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Not happy with this “optimized” lineFeel ONE Ppi for all cases not goodNeed a thought (== analysis of data)
I rescale the central (444 256) case for400.0 230336.8 200
Select backward going muons
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Muon BeamLine: G4BL simulation – Diffuser
+ ------------ CALC_EMI ------------- + = 3.41 mm rad X = 4.35 cm Y = 4.88 cm T = 1250 mm T = -0.0017 RADIUS = 65.3 mm x= 3.76 mm rad x= 1004 mm x= 0.367 y= 3.10 mm rad y= 1534 mm y= -0.450
P=214 MeV/c Z=Diffuser
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Measuring (e,P) from DATA
- Rationale- checking if an optics produces the foreseen () at diffuser- measure (and P) of the muon beam
- How?- use TOF0 / 1 as (x,y) stations- define muon sample- track mu’s in the Q7-8-9 triplet- infer x’, y’ (x,x’) (y,y’)
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Mark Rayner’stools
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a) Monitoring the Run
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e.g. ... (7, 9, 10, … December)PI (444 MeV/c) MU (258 MeV/c)
beforenew calib
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b) Select muons
c) Compute phase space
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RUN 1408 – P0=400 /PD2=230 selecting the muons
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TOF 0
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TOF 1
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-----------------------------------------------------------------------If muons...x RMS norm emittance = 4.5 mmy RMS norm emittance = 1.8 mmTransverse 4d RMS norm emittance = 2.8 mm
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RUN 1386-1387 – P0=444 /PD2=256 selecting the muons
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G4BL prediction
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X’ vs X Y’ vs YG4BL
TOF 0
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TOF 1
X’ vs X Y’ vs YG4BL
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RUN 1409–1411 P0=336.8 /PD2=200 selecting the muons
(very broad peak, I kept conservative)
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-------------------------------------------------------------------If muons...x RMS norm emittance = 4.27 mmy RMS norm emittance = 1.77 mmTransverse 4d RMS norm emittance = 2.75 mm
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Conclusions- After 1 year we are back on DATA taking
- target is working- DKSol is ON
- We have been collecting data Since September 2009 - Calibrations - Rate vs Target Dip Depth (AD) - Q123 scan
- need to understand discrepancies
- DKSol scan- analysis in progress
- (e,P) matrix measurements- analysis just started, - Mark’s algorithm needs to be tuned
-(e,P) optimsed optics do not look handsome need to be understood and reviewed to some extent 17 December 2009 40MICE VC 127
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Plans- Short term
- keep taking pi mu cases to increase statistics)- stick to (-) polarity to avoid rushing
- Medium Term (Shutdown)- campaign of measurements of mag fields ? - hysteresis checks (doc is not clear + measurements done at I<Imax)- any other suggestion?
- Longer term (>next User’s Run)- review optimisation of the (e,P) matrix- back to (+) polarity and repeat (e,P) data taking
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