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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-

6

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

11I

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…