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Beam diagnostics control for J-PARC LINAC
Guobao SHEN
J-PARC CenterJapan Atomic Energy Agency
Mar. 2008
Mar. 2008 Beam diagnostics control for J-PARC LINAC 2
Content
Overview of J-PARC LINAC
IOC Development
OPI Presentation
Beam Observation
Performance
Summary
Mar. 2008 Beam diagnostics control for J-PARC LINAC 3
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
Mar. 2008 Beam diagnostics control for J-PARC LINAC 4
Beam diagnostics
Device Types Purpose Total
SCT (Slow Current Transformer) Beam Current 38
FCT (Fast Current Transformer) Beam Phase/Energy 61
Digital Switcher for phase detector Dynamic Range Change 21
BPM (Beam Position Monitor) Beam Orbit 102
WSM (Wire Scanner Monitor) Beam Size/Profile 36
BLM (Beam Loss Monitor) Beam Loss 58
1. Overview of J-PARC LINAC
Mar. 2008 Beam diagnostics control for J-PARC LINAC 5
2. IOC Development
Hardware Interfaces of Monitor ControlWE 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 moduleWER modules
Home-made Wave-Endless-Recorder. 200MS/s, 12-bit resolution, 4 channels
for BPM 10MS/s, 12-bit resolution, 4 channels
for BLM
Mar. 2008 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
Mar. 2008 Beam diagnostics control for J-PARC LINAC 7
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
Mar. 2008 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 study
Confirmed beam @ 25mA
Mar. 2008 Beam diagnostics control for J-PARC LINAC 9
3. OPI Presentation
Beam delivery1st beam observation at 30º dump (RUN3 )
181MeV, 5.5mA, 20μs, 2.5Hz
SCT
SCT Waveform2mA
40s
30º dump
0º dump
beam
Bendmagnets
Mar. 2008 Beam diagnostics control for J-PARC LINAC 10
3. OPI Presentation
Beam position181MeV, 25mA
on May, 2007
Waveform (MEDM)
Orbit (JCE Based)
JCE: J-PARC Commissioning Environment
Mar. 2008 Beam diagnostics control for J-PARC LINAC 11
May 24SDTL02BX 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 ObservationBPM Monitor: Beam Position Stability
Mar. 2008 Beam diagnostics control for J-PARC LINAC 12
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
Mar. 2008 Beam diagnostics control for J-PARC LINAC 13
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
Mar. 2008 Beam diagnostics control for J-PARC LINAC 14
Horizontal
Last BPM
2nd last BPM
Vertical
Last BPM
2nd last BPM
Last 2 BPM’s in L3BTinjection line
Last 2 BPM’s in L3BTinjection 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
Mar. 2008 Beam diagnostics control for J-PARC LINAC 15
Wire Scanner: Typical horizontal profile
WS53 WS55
WS57 WS59
Noisy
25mACollimator section
Slight halo
Slight haloobserved in the horizontal direction.
4. Beam Observation
Mar. 2008 Beam diagnostics control for J-PARC LINAC 16
WS53 WS55
WS57 WS59
Noisy
25mACollimator section
More profound halo is observed in the vertical direction.
4. Beam ObservationWire Scanner: Typical horizontal profile
Mar. 2008 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
Mar. 2008 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