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

2. Beam diagnostics control for J-PARC LINAC2 Content  Overview of J-PARC LINAC  IOC Development  OPI Presentation  Beam Observation  Performance  Summary

3. Mar. 2008 Beam diagnostics control for J-PARC LINAC3  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 mA for 1MW at 3GeV)  Repetition:25 Hz (additional 25 Hz for ADS application)  Pulse width:0.5 msec 181(191)MeV (400MeV) (600MeV ) L3BT 1. Overview of J-PARC LINAC

4. Mar. 2008 Beam diagnostics control for J-PARC LINAC4  Beam diagnostics Device TypesPurposeTotal SCT (Slow Current Transformer) Beam Current38 FCT (Fast Current Transformer) Beam Phase/Energy61 Digital Switcher for phase detector Dynamic Range Change21 BPM (Beam Position Monitor) Beam Orbit102 WSM (Wire Scanner Monitor) Beam Size/Profile36 BLM (Beam Loss Monitor)Beam Loss58 1. Overview of J-PARC LINAC

5. Mar. 2008 Beam diagnostics control for J-PARC LINAC5 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

6. Mar. 2008 Beam diagnostics control for J-PARC LINAC6 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

7. Mar. 2008 Beam diagnostics control for J-PARC LINAC7 2. IOC Development  IOC for WER control  DAQ:  Rack-mounted Server: A Java based Application (METIS)  IOC:  H/W: Rack-mounted Server (Intel-based)  S/W: OS: RHEL 4 (Nahant); EPICS: 3.14.9

8. Mar. 2008 Beam diagnostics control for J-PARC LINAC8 3. OPI Presentation  Beam current  SCT waveform  MEDM based  Confirmed beam 1 st day of 1 st beam study  Beam current  EDM based  High intensity beam study Confirmed beam @ 25mA

9. Mar. 2008 Beam diagnostics control for J-PARC LINAC9 3. OPI Presentation  Beam delivery  1st beam observation at 30º dump (RUN3 )  181MeV, 5.5mA, 20μs, 2.5Hz SCT SCT Waveform 2mA 40  s 30º dump 0º dump beam Bend magnets

10. Mar. 2008 Beam diagnostics control for J-PARC LINAC10 3. OPI Presentation  Beam position  181MeV, 25mA on May, 2007  Waveform (MEDM)  Orbit (JCE Based) JCE: J-PARC Commissioning Environment

11. Mar. 2008 Beam diagnostics control for J-PARC LINAC11 May 24 SDTL02BX SDTL03AX 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. 4. Beam Observation BPM Monitor: Beam Position Stability

12. Mar. 2008 Beam diagnostics control for J-PARC LINAC12 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. 4. Beam Observation

13. Mar. 2008 Beam diagnostics control for J-PARC LINAC13 After making new frame of the wire scanner, a clear beam orbit jump was not seen. SDTL05A 4. Beam Observation September 29 BPM Monitor: Beam Position Stability

14. Mar. 2008 Beam diagnostics control for J-PARC LINAC14 Horizontal Last BPM 2nd last BPM Vertical Last BPM 2nd last BPM Last 2 BPM’s in L3BT injection line Last 2 BPM’s in L3BT injection line 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. RUN12 These 2 BPM’s are 4.1 m apart. BPM Monitor: Beam position jitter 4. Beam Observation

15. Mar. 2008 Beam diagnostics control for J-PARC LINAC15 Wire Scanner: Typical horizontal profile WS53 WS55 WS57 WS59 Noisy 25mA Collimator section Slight halo Slight halo observed in the horizontal direction. 4. Beam Observation

16. Mar. 2008 Beam diagnostics control for J-PARC LINAC16 WS53 WS55 WS57 WS59 Noisy 25mA Collimator section More profound halo is observed in the vertical direction. 4. Beam Observation Wire Scanner: Typical horizontal profile

17. Mar. 2008 Beam diagnostics control for J-PARC LINAC17 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

18. Mar. 2008 Beam diagnostics control for J-PARC LINAC18 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