RAL Muon Beam Line Properties
ISIS70 MeV H- injectionRing accelerates up to 800 MeV in about 10 ms
50 Hz cycle - Dual Harmonic System ~ 2 x 1.5 MHz; ~0.84
100 ns 100 ns230 ns
1.2 1013 protons
Rotation
Frequency
@800 MeV
Target Mechanism :
Coupled Oscillators:
50 Hz
150 HzTarget
Beam
Readout
2 ms
Target: 50 Hz + 150 Hz motione.g. equal amplitude:
20 ms
15 cm diam. (90%)
Beam: width 15cm contains ~1013 protons
Target: Ti 8×1 mm2. Intercepts 1‰ by area ~ 3×109 protons.
Limit by temperature: ~108
protons at 50 Hz.
Max possible intercepted beam
During the 2 ms, with the beam rotating at ~ 1.5 MHzthe beam circulates ~ 3x103 times
During 100 s of active RF; beam circulates 150 times
0
400
800
1200
1600
0 200 400 600 800
pi+
pi-
MeV/c
Rel
ativ
e F
lux
Particle Production (800 MeV)
LAHET calculations
Scattering Angle & Momentum:
50o
30o
40o
800 MeVprotonbeam
40o
30o
50o
Initial p
“Backwards” going muon
p locus,lab frame
p locus, rest frame
Largest difference between pion and muon momenta comes from backward going muons.
Relative + (and + bgd) as a fn of the initial and final momentum selection
300 MeV/c +
P+ MeV/c
P+ MeV/c
200 MeV/c +
Note: D2 is fixed to the momentum of the muon. The transmission of and is plotted as a fn of the pion momentum selected by D1.
+
+
D1
D2
Solenoid
Suggested Beam Line Layout (schematic)
Early questions to be addressed:
- modifications to target box ?- how close in can the beam line be ?- position and size of breach in wall ?
- do better without any quads?
Type II Dipole Magnet 55 degree bend0.863 T field (1.58 T max)
-0.25
-0.2
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0.2
0.25
-0.15 -0.1 -0.05 0 0.05 0.1 0.15
X (m)
Xp
(r)
-0.25
-0.2
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0.2
0.25
-0.15 -0.1 -0.05 0 0.05 0.1 0.15
Y (m)
Yp
(r)
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
-0.15 -0.1 -0.05 0 0.05 0.1 0.15
X (m)
Y (
m)
0
50
100
150
200
250
300
350
400
450
-0.2 -0.15 -0.1 -0.05 0 0.05 0.1 0.15 0.2
Y (m)
N(Y
)
0
100
200
300
400
500
600
-0.2 -0.15 -0.1 -0.05 0 0.05 0.1 0.15 0.2
X (m)
N(X
)
Estimate ~7,500 muons in a 100 s burstevery 20 ms.
What is the maximummuon rate?
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