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Beam diagnostics control for J-PARC LINAC

Beam diagnostics control for J-PARC LINAC. Guobao SHEN J-PARC Center Japan Atomic Energy Agency Mar. 2008. Content. Overview of J-PARC LINAC IOC Development OPI Presentation Beam Observation Performance Summary. 1. Overview of J-PARC LINAC. Major Parameters

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Beam diagnostics control for J-PARC LINAC

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  1. Beam diagnostics control for J-PARC LINAC Guobao SHEN J-PARC CenterJapan Atomic Energy Agency Mar. 2008

  2. Content • Overview of J-PARC LINAC • IOC Development • OPI Presentation • Beam Observation • Performance • Summary Beam diagnostics control for J-PARC LINAC

  3. 1. Overview of J-PARC LINAC • Major Parameters • Particles: H- (negative hydrogen) • Energy: 181 MeV, The last two SDTLs are debunchers (400 MeV for ACS, 600 MeV for SCL) • Peak current: 30 mA (50 mAfor 1MW at 3GeV) • Repetition: 25 Hz (additional 25 Hz for ADS application) • Pulse width: 0.5 msec L3BT 181(191)MeV (400MeV) (600MeV ) Beam diagnostics control for J-PARC LINAC

  4. 1. Overview of J-PARC LINAC • Beam diagnostics Beam diagnostics control for J-PARC LINAC

  5. 2. IOC Development • Hardware Interfaces of Monitor Control • WE modules from Yokogawa • Digitizer module for data acquisition • WE7118: 100MS/s, 14-bit resolution, 2 channels • for BPM, FCT & WSM • WE7111: 100MS/s, 8-bit resolution, 1 channel • for SCT and BLM • Digital switcher for phase detector • WE7262: DIO module • WER modules • Home-made Wave-Endless-Recorder. • 200MS/s, 12-bit resolution, 4 channels • for BPM • 10MS/s, 12-bit resolution, 4 channels • for BLM Beam diagnostics control for J-PARC LINAC

  6. 2. IOC Development • IOC for WE control • DAQ: • By IOC directly • IOC: • H/W: Advme7501 VME-SBC (PowerPC) • S/W: OS: vxWorks 5.5.1; EPICS: 3.14.8.2 Beam diagnostics control for J-PARC LINAC

  7. 2. IOC Development • IOC for WER control • DAQ: • Rack-mountedServer: A Java based Application (METIS) • IOC: • H/W: Rack-mounted Server (Intel-based) • S/W: OS: RHEL 4 (Nahant); EPICS: 3.14.9 Beam diagnostics control for J-PARC LINAC

  8. 3. OPI Presentation • Beam current • SCT waveform • MEDM based • Confirmed beam 1st day of 1st beam study • Beam current • EDM based • High intensity beam studyConfirmed beam @ 25mA Beam diagnostics control for J-PARC LINAC

  9. 30º dump SCT Bendmagnets 0º dump beam SCT Waveform 2mA 40s 3. OPI Presentation • Beam delivery • 1st beam observation at 30º dump (RUN3 ) • 181MeV, 5.5mA, 20μs, 2.5Hz Beam diagnostics control for J-PARC LINAC

  10. 3. OPI Presentation • Beam position • 181MeV, 25mA on May, 2007 • Waveform (MEDM) • Orbit (JCE Based) JCE: J-PARC Commissioning Environment Beam diagnostics control for J-PARC LINAC

  11. 4. Beam Observation BPM Monitor: Beam Position Stability SDTL03AX SDTL02BX May 24 Good position stability up to the SDTL-2 was performed, but positions were moving after the SDTL-3 in 0.5-1 hour cycle. We suspected a Q-magnet rare short, higher order mode in the cavity, etc., for this instability. Beam diagnostics control for J-PARC LINAC

  12. 4. Beam Observation Reason: The frame of the wire scanner is made of ceramics. Electrons from the cavity charge up the frame, and induced voltage steers the beam. Beam diagnostics control for J-PARC LINAC

  13. 4. Beam Observation BPM Monitor: Beam Position Stability September 29 SDTL05A After making new frame of the wire scanner, a clear beam orbit jump was not seen. Beam diagnostics control for J-PARC LINAC

  14. 4. Beam Observation BPM Monitor: Beam position jitter RUN12 Vertical Horizontal Last 2 BPM’s in L3BT injection line Last 2 BPM’s in L3BT injection line 2nd last BPM 2nd last BPM Last BPM Last BPM These 2 BPM’s are 4.1 m apart. The position jitter at the RCS injection is around ±0.2 mm (60 m in RMS) including the intrinsic jitter (or noise) of the monitor system. Beam diagnostics control for J-PARC LINAC

  15. Wire Scanner: Typical horizontal profile 4. Beam Observation 25mA Collimator section WS55 WS53 Slight haloobserved in the horizontal direction. WS59 WS57 Slight halo Noisy Beam diagnostics control for J-PARC LINAC

  16. 4. Beam Observation Wire Scanner: Typical horizontal profile 25mA Collimator section WS55 WS53 More profound halo is observed in the vertical direction. WS59 WS57 Noisy Beam diagnostics control for J-PARC LINAC

  17. 5. IOC Performance • Resource using ratio (repetition: 2.5Hz) • CPU usage: < 40% • Memory usage: ~ 25% • Performance • Repetition rate: up to 6Hz • Satisfy current requirement of beam commissioning (2.5~5Hz) • Achieved WE hardware limit During Beam commissioning CPU Usage Memory Usage Beam diagnostics control for J-PARC LINAC

  18. 6. Summary • Beam Diagnostics Control for J-PARC LINAC • Two type hardware interfaces are employed • Commercial hardware: WE from Yokogawa • Module based, Compact digitizer • Home-made digitizer: WER • EPICS based • IOC: • EPICS R3.14.8.2+vxWorks5.5.1 • EPICS R3.14.9+RHEL 4 • OPI • MEDM, EDM, JCE App • Effective beam commissioning • with the support of diagnostics control • The control of beam diagnostics proved their usefulness in the beam status observation, and the beam commissioning Beam diagnostics control for J-PARC LINAC

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