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

2. 2 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

3. 3 Fast Extracted Beam Line & Beam Monitors FF TS -Beam Arc PS I,C,P C,P I,C,P C,P P P P C, P C, P C, P I,C,P I,P TGT Beam Monitor I : Intensity (CT) C: Center position (LPM) P: Profile (SSEC/RGBPM) ] BLM will be placed along the beam line.

4. 4 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) Profile J. 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)

5. 5 Tanabe’s Talk (Next) +HV p pulse Vac.~10 -6 Torr. e-e- e-e-

6. 6 Beam Dipole Mag. Residual Gas Beam Profile Monitor (proto-type) in KEK-PS RGBPM MCP -HV B>0.03T e-e- Vac. ~10 -6 Torr. Ishida’s Talk (Next next)

7. 7 Beam Loss Monitor 30 cm Sato’s Talk (11/11)

8. 8 Loop Pickup Monitor (LPM) :Beam Non-Destructive  No Beam Loss :Large Signal  No Amp. Necessary :Simple Structure  Easy Maintenance

9. 9 M  = M + - M - = (  l)/(4  )× ｛ Ln[(r 0 2 b 2 +a 4 -2a 2 br 0 cos  0 )/ (r 0 2 b 2 +a 4 -2a 2 br 0 cos  0 )] ＋ Ln[(b 2 +r 0 2 -2br 0 cos  0 ) /(b 2 +r 0 2 -2br 0 cos  0 )] ｝ M  = M + + M - = (  l)/(4  )×Ln[((r 0 2 b 2 +a 4 ) 2 -4a 4 r 0 2 b 2 cos 2  0 )/ ((b 2 +r 0 2 ) 2 -4r 0 2 b 2 cos 2  0 )/a 4 ]  = 0,  structure

10. 10 Expected  Response for Beam Positioning  /  = M  /M  a=95 mm, b=85 mm  depends on only geometrical parms  /  ~ x 0 (a 2 -b 2 )/[a 2 b Ln(a/b)], x 0 <<a,b x0x0

11. 11 I Waveform Generator Oscilloscope Response for Test Pulse J. Kameda

12. 12 Input Output ~15mA ~4mV Response for Test Pulse (Cont.) J. Kameda

13. 13 Equivalent Circuit V 1 = M(dI b /dt) + L/Z(dV 1 /dt) …… (#) Observation seems… V 1 >> L/Z(dV 1 /dt) in (#) Response for Test Pulse (Cont.)

14. 14 Response for Test Pulse (Cont.) J. Kameda

15. 15 LPM Beam Test at KEK-PS (Fast Beam) LPM CT 12-GeV Beam

16. 16 ~3cm to the right (Ch.1) Center ~3cm to the left (Ch.3)

17. 17 ○ 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

18. 18 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)

19. 19 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 Summary (Cont.) ○ Mile Stone…