117 December 2009 MICE VC 127 1
MICE Beamline Statusm. apollonio
217 December 2009 MICE VC 127 2
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
D1
D2 Q4
Q1
Q2
Q3
Q5 Q6 Q7 Q8 Q9317 December 2009 MICE VC 127 3
TOF2
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
17 December 2009 5MICE VC 127
• 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
17 December 2009 6MICE VC 127
nominal config.
data
MC
-
-
e-
f1-only (MC) DATA• Q1 scan
Q1-Q2-Q3 scan – US beamline optimisation
17 December 2009 7MICE VC 127
nominal config.
data
MC
-
-
e-
f2-only (MC) DATA
• Q2 scan
Q1-Q2-Q3 scan – US beamline optimisation
17 December 2009 8MICE VC 127
Q1-Q2-Q3 scan – US beamline optimisation
• Q3 scan
nominal config.
data
MC
-
-
e-
f3-only (MC) DATA
17 December 2009 9MICE VC 127
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
1017 December 2009 MICE VC 127 10
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
1117 December 2009 MICE VC 127 11
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
1217 December 2009 MICE VC 127 12
Y vs X P/P<10%
P/P|>10%
X’ vs X
Y’ vs Y
DKSol SCAN
- Rationale- Change DK current change optics downstream DKSol- handle for tuning- check data vs MC (our understanding of BL)- ongoing task (unfinished …)
17 December 2009 13MICE VC 127
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?
17 December 2009 14MICE VC 127
beam line- Rationale
- select u.s. of DKSol with D1- select d.s. of DKSol with D2
- back scattered muons == purity
17 December 2009 15MICE VC 127
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
1617 December 2009 MICE VC 127 16
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
17 December 2009 MICE VC 127 18 190 350
Pdiff = 148 215 256
Ppi (tgt) = 350
17 December 2009 MICE VC 127 19
Will it work?
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
17 December 2009 20MICE VC 127
?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
17 December 2009 MICE VC 127 22
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
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
2317 December 2009 MICE VC 127 23
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’)
17 December 2009 24MICE VC 127
Mark Rayner’stools
a) Monitoring the Run
17 December 2009 MICE VC 127 25
17 December 2009 MICE VC 127 26
e.g. ... (7, 9, 10, … December)PI (444 MeV/c) MU (258 MeV/c)
beforenew calib
b) Select muons
c) Compute phase space
17 December 2009 MICE VC 127 27
17 December 2009 MICE VC 127 28
RUN 1408 – P0=400 /PD2=230 selecting the muons
17 December 2009 MICE VC 127 29
TOF 0
17 December 2009 MICE VC 127 30
TOF 1
17 December 2009 MICE VC 127 31
-----------------------------------------------------------------------If muons...x RMS norm emittance = 4.5 mmy RMS norm emittance = 1.8 mmTransverse 4d RMS norm emittance = 2.8 mm
17 December 2009 MICE VC 127 32
RUN 1386-1387 – P0=444 /PD2=256 selecting the muons
17 December 2009 MICE VC 127 33
G4BL prediction
17 December 2009 MICE VC 127 34
X’ vs X Y’ vs YG4BL
TOF 0
17 December 2009 MICE VC 127 35
TOF 1
X’ vs X Y’ vs YG4BL
17 December 2009 MICE VC 127 36
RUN 1409–1411 P0=336.8 /PD2=200 selecting the muons
(very broad peak, I kept conservative)
17 December 2009 MICE VC 127 37
-------------------------------------------------------------------If muons...x RMS norm emittance = 4.27 mmy RMS norm emittance = 1.77 mmTransverse 4d RMS norm emittance = 2.75 mm
17 December 2009 MICE VC 127 38
17 December 2009 MICE VC 127 39
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
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
17 December 2009 41MICE VC 127