NBI03
Primary Beam Session
KEK
H. Noumi
for Target-Monitor R&D SGJ-PARC ν Proton Beam Monitor- Overview and LPM -1

J-PARC Target-Monitor SG Membership2003.11.7
ν-G.
H. Aihara, Y. Hayato, A. Ichikawa, R. Ishida,
M. Iwasaki, J. Kameda, T. Kobayashi,
T. Nakadaira, A. Suzuki, K. Tanabe, and S. Ueda
Beam channel G.
K. Agari, E. Hirose, H. Noumi, Y. Sato, Y. Suzuki,
H. Takahashi, M. Takasaki, A. Toyoda,
Y. Yamada, and Y. Yamanoi
Online/Electronics G.
Y. Igarashi, S. Inaba, and M. Tanaka
And…
K. Yoshimura, J. Imazato, and M. Sekimoto2

Fast Extracted Beam Line & Beam Monitors
ν-BeamTS

FFC,P C,PC,PC,P

TGT

I,C,P

Arc C,PC,P

I,P

C, C,P P

C,PC, I,C,P
P

Beam Monitor
I : Intensity (CT)
C: Center position (LPM)
P: Profile (SSEC/RGBPM)

P
P

C,P

BLM will be placed along the beam line.

PPS
C,P
I,C,P

3

Line-Up of Primary Beam Monitors
Position
ProfileIntensityInterlock(MPS)

Loop Pick-up Monitor (LPM)
J. Kameda, H. Noumi
Segmented 2ndary Emission C. (SSEC)
K. Tanabe, M. Iwasaki, H. Aihara, Y. Yamanoi
Residual Gas Ion. C. (RGBPM)
R. Ishida, M. Iwasaki, H. Aihara, Y. Sato
(special thanks: T. Kawakubo, Y. Ajima)
Current Transformer (CT)(J. Kameda, M. Ieiri:K2K experience)Beam-Loss Monitor （BLM)
Y. SatoHalo Monitor (SEC)
Thermo-couple (TC)/Vacuum Monitor(VM)
4

Vac.~10-6 Torr.
Tanabe’s Talk (Next)+HVe-eppulse

5Ishida’s Talk (Next next)
Residual Gas Beam Profile Monitor (proto-type)in KEK-PS
MCP

Vac.
~10-6 Torr.

Dipole Mag.
eBea m-HV
RGBPM
B>0.03T
6

Sato’s Talk (11/11)

Beam Loss Monitor

30 cm
7

Loop Pickup Monitor (LPM)

Beam Non-Destructive Æ No Beam Loss
Large Signal Æ No Amp. Necessary
Simple Structure Æ Easy Maintenance8

structure

φ = 0, πM∆ = M + - M= (µl)/(4π)×｛Ln[(r02b2+a4-2a2br0 cos φ0)/ (r02b2+a4-2a2br0 cos φ0)]＋Ln[(b2+r02-2br0 cos φ0) /(b2+r02-2br0 cos φ0)]｝MΣ = M + + M= (µl)/(4π)×Ln[((r02b2+a4)2-4a4r02b2 cos2φ0)/ ((b2+r02) 2-4r02b2 cos2φ0)/a4]
9Expected ∆/Σ Response for Beam Positioning∆/Σ = M∆/MΣ Æ depends on only geometrical parms⊿/∑ Calculation
1.5
1
⊿/∑

0.5
⊿/∑ Cal.

0-100-50

-0.5

050

100-1-1.5x0 position (mm)a=95 mm, b=85 mm∆/Σ ~ x0 (a2-b2)/[a2b Ln(a/b)], x0 <<a,b10

Response for Test Pulse

J. Kameda

Oscilloscope
Waveform
GeneratorI11

Response for Test Pulse (Cont.)

J. Kameda

Input
~15mA

Output~4mV

12

Response for Test Pulse (Cont.)
Equivalent Circuit

V1 = M(dIb /dt) + L/Z(dV1 /dt) ……(#)
Observation seems…
V1 >> L/Z(dV1 /dt) in (#)
13

Response for Test Pulse (Cont.)

Calculation
Test Pulse

J. Kameda

1

⊿/∑

0.5
0-50

-25

025

50-0.5-1
position (mm)14LPM Beam Test at KEK-PS (Fast Beam)

12-GeV
Beam
LPM
CT

15

Center~3cm to the right (Ch.1)~3cm to the left (Ch.3)

16

Summary○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 Æ 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
17

Readout System
Online/Electronics G.
Y. Igarashi, S. Inaba, and M. Tanaka etal.
Integrator for BLM (Inaba et al.)proto-type design doneÆ Scan ADC in VMEcontrolled in the EPICS framework
Charge ADC (Tanaka, Igarashi et al.)Current Integrator type/ Flash ADC type in R&DÆ integrated on VME based board w/ CPU/Mem…
“Cupper” board (post KEK standard)18

Summary (Cont.)○Mile Stone…
FY2003 Design/Test proto-type
FY2004 R&D
FY2005 Finalize the Designs
2006.4~ Start Mass Production
2007.7~ Start Installation
2009.1~ Start Operation

19