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J-PARC Proton Beam Monitor- Overview and LPM -
NBI03 Primary Beam Session
KEKH. Noumifor Target-Monitor R&D SG
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J-PARC Target-Monitor SG Membership
-G.
H. Aihara, Y. Hayato, A. Ichikawa, R. Ishida, M. Iwasaki, J. Kameda, T. Kobayashi, T. Nakadaira, A. Suzuki, K. Tanabe, and S. Ueda
K. Agari, E. Hirose, H. Noumi, Y. Sato, Y. Suzuki, H. Takahashi, M. Takasaki, A. Toyoda, Y. Yamada, and Y. Yamanoi
Beam channel G.
And…
K. Yoshimura, J. Imazato, and M. Sekimoto
Online/Electronics G.
Y. Igarashi, S. Inaba, and M. Tanaka
2003.11.7
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Fast Extracted Beam Line & Beam Monitors
FFTS-Beam
Arc
PS
I,C,P
C,P
C,P
I,C,P
C,P
C,P
C,P
C,PC,PC,PC,P
P
PP
C,P
C,P
C,P
I,C,PI,P
TGT
Beam MonitorI : Intensity (CT)C: Center position (LPM)P: Profile (SSEC/RGBPM)
BLM will be placed along the beam line.
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Line-Up of Primary Beam Monitors
Position Loop Pick-up Monitor (LPM)
Intensity Current Transformer (CT)
Interlock(MPS)
Beam-Loss Monitor ( BLM)
Residual Gas Ion. C. (RGBPM)
Segmented 2ndary Emission C. (SSEC)
Halo Monitor (SEC)Thermo-couple (TC)/Vacuum Monitor(VM)
ProfileJ. Kameda, H. Noumi
K. Tanabe, M. Iwasaki, H. Aihara, Y. Yamanoi
R. Ishida, M. Iwasaki, H. Aihara, Y. Sato
Y. Sato
(J. Kameda, M. Ieiri:K2K experience)
(special thanks: T. Kawakubo, Y. Ajima)
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Tanabe’s Talk (Next) +HV
p
pulse
Vac.~10-6 Torr.
e- e-
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Beam
Dipole Mag.
Residual Gas Beam Profile Monitor (proto-type) in KEK-PS
RGBPM
MCP
-HV
B>0.03T
e-
Vac.~10-6 Torr.
Ishida’s Talk (Next next)
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Beam Loss Monitor
30 cm
Sato’s Talk (11/11)
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Loop Pickup Monitor (LPM)
Beam Non-Destructive No Beam LossLarge Signal No Amp. NecessarySimple Structure Easy Maintenance
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M = M+ - M- = (l)/(4)× { Ln[(r0
2b2+a4-2a2br0 cos 0)/ (r02b2+a4-2a2br0 cos 0)]
+ Ln[(b2+r02-2br0 cos 0) /(b2+r0
2-2br0 cos 0)] }M = M+ + M- = (l)/(4)×Ln[((r0
2b2+a4)2-4a4r02b2
cos20)/ ((b2+r02) 2-4r0
2b2 cos20)/a4]
= 0,
structure
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Expected Response for Beam Positioning
/ = M/M
⊿/∑ Calculation
-1.5
-1
-0.5
0
0.5
1
1.5
-100 -50 0 50 100
position (mm)
⊿/∑ ⊿ / ∑ Cal.
a=95 mm, b=85 mm
depends on only geometrical parms
/ ~ x0 (a2-b2)/[a2b Ln(a/b)], x0 <<a,b
x0
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WaveformGenerator
Oscilloscope
Response for Test Pulse J. Kameda
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Input
Output
~15mA
~4mV
Response for Test Pulse (Cont.) J. Kameda
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Equivalent Circuit
V1 = M(dIb /dt) + L/Z(dV1 /dt) ……(#)
Observation seems… V1 >> L/Z(dV1 /dt) in (#)
Response for Test Pulse (Cont.)
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-1
-0.5
0
0.5
1
-50 -25 0 25 50
position (mm)
⊿/∑
CalculationTest Pulse
Response for Test Pulse (Cont.) J. Kameda
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LPM Beam Test at KEK-PS (Fast Beam)
LPMCT
12-GeVBeam
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~3cm to the right (Ch.1)Center
~3cm to the left (Ch.3)
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○FEB Monitors in J-PARC - Position: LPM - Profile: SSEC/RGBPM - Intensity: CT - Protection: BLM(BHM,TC,VM)○Beam Tests at KEK-PS have started this year - LPM Observed Signals/Position Responses - others (See later talks)○R&D necessary - LPM: core (ferrite/permalloy/paramagnetic), # of turn - SSEC: material, lifetime, segmentation, mechanics,… - RGBPM: fundamental demonstration, lifetime,… - BLM: cost, lifetime - Readout System
Summary
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Readout System
Online/Electronics G.
Y. Igarashi, S. Inaba, and M. Tanaka etal.
Integrator for BLM (Inaba et al.) proto-type design done Scan ADC in VME controlled in the EPICS framework Charge ADC (Tanaka, Igarashi et al.)
Current Integrator type/ Flash ADC type in R&D integrated on VME based board w/ CPU/Mem…
“Cupper” board (post KEK standard)
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FY2003 Design/Test proto-typeFY2004 R&DFY2005 Finalize the Designs2006.4~ Start Mass Production2007.7~ Start Installation2009.1~ Start Operation
Summary (Cont.)
○Mile Stone…