View
41
Download
1
Category
Preview:
DESCRIPTION
Tools used for the beam commissioning of J-PARC LINAC. Guobao SHEN J-PARC Center Japan Atomic Energy Agency Mar. 2008. Content. HLA Environment Tuning of RF Amplitude and Phase Beam Base Calibration Summary. 1. HLA Environment. High Level App Environment for J-PARC Yamamoto-san’s Talk - PowerPoint PPT Presentation
Citation preview
Tools used for the beam commissioning of J-PARC LINAC
Guobao SHEN
J-PARC CenterJapan Atomic Energy Agency
Mar. 2008
Mar. 2008 Tools used for the beam commissioning of J-PARC LINAC 2
Content
HLA Environment
Tuning of RF Amplitude and Phase
Beam Base Calibration
Summary
Mar. 2008 Tools used for the beam commissioning of J-PARC LINAC 3
1. HLA Environment
High Level App Environment for J-PARC Yamamoto-san’s Talk
HLA Environment for J-PARC LINACXAL
RF tuning Beam Based Calibration/Alignment Orbit correction Beam energy analyzer Save and Restore DB …Others
JCE (Wrapper XAL, Script Language) Transverse matching …Others
Mar. 2008 Tools used for the beam commissioning of J-PARC LINAC 4
2. Tuning of RF Amplitude and Phase LINAC RF Station:
Buncher (2), DTL (3), SDTL (15), Debuncher (2)
RF Tuning Use phase-scan method Absolute beam energy measured with TOF (Time-Of-Flight)
Tuning Knobs: RF Amplitude (A), Phase(Φ)
3 MeV 50 MeV 181 MeV
Mar. 2008 Tools used for the beam commissioning of J-PARC LINAC 5
Tank level: 1.00 (design)
Phase scan curve becomes flat at around the design tank level. Insensitive in the flat region with RF setting
RF tuned comparing measurement with simulation Similar scheme for DTL2 and DTL3.
2. Tuning of RF Amplitude and Phase
DTL1
RF tuning scheme for DTL Simulated Energy Curves @ 11 different tank levels are shown.
Beam Energy Acceptance
Mar. 2008 Tools used for the beam commissioning of J-PARC LINAC 6
2. Tuning of RF Amplitude and Phase
FCT monitor configuration for DTL
SDTL1A SDTL1BDTL3 SDTL2A
Beam
SDTL2BDTL2DTL1
TOF Pair for DTL3Apart by ~ 21
FCT (Fast Current Transformer)
TOF Pair for DTL2Apart by ~ 31
TOF Pair for DTL1Apart by ~ 52
Mar. 2008 Tools used for the beam commissioning of J-PARC LINAC 7
Injection energy
Energy gain
Tank level
SDTL1
Simulated phase scan curves for 5 different tank levels are shown.
2. Tuning of RF Amplitude and Phase
Phase scan curve is similar sinusoid. RF tuned comparing measurement with simulation, same idea with DTL Similar scheme for BUNCHER & DEBUNCHER.
RF tuning scheme for SDTL
Mar. 2008 Tools used for the beam commissioning of J-PARC LINAC 8
SDTL2A SDTL2B SDTL3A
Beam
SDTL3BDTL3 SDTL1A SDTL1B
Klystron Klystron KlystronPhase scan
Long TOF pair apart by ~21
Short TOF pairapart by ~2
Short and long TOF pairs are prepared for each klystron.Short TOF pair is utilized to avoid miscounting of wave numbers in the long pair.
2. Tuning of RF Amplitude and Phase
FCT monitor configuration for SDTL
Mar. 2008 Tools used for the beam commissioning of J-PARC LINAC 9
Beam Current(by SCT Monitor)
2. Tuning of RF Amplitude and Phase
RF tuning: Automated application using XAL frameworkSame for all cavities
Beam Phase(by FCT Monitor)
Scan controller & raw data
Mar. 2008 Tools used for the beam commissioning of J-PARC LINAC 10
2. Tuning of RF Amplitude and Phase
RF tuning: Beam energy curves
Mar. 2008 Tools used for the beam commissioning of J-PARC LINAC 11
2. Tuning of RF Amplitude and Phase
RF tuningSignature
matching
with
PARMILA
model
Deviation
of measured
phase scan
curve
from model
Set-point
Signature matching for SDTL01
Mar. 2008 Tools used for the beam commissioning of J-PARC LINAC 12
Final scan Solid line: simulation; Maker: measurement
2. Tuning of RF Amplitude and Phase
SDTL1 SDTL8SDTL15
(From manual to automation)
Mar. 2008 Tools used for the beam commissioning of J-PARC LINAC 13
RUN9
RUN3
Larger deviation than expected.To be further investigated.
Jan. 2007 Sep. 2007
The tuning accuracy is substantially improved by fine tuning.
The energy deviation from each SDTL module is mostly less than 0.3 %.
2. Tuning of RF Amplitude and Phase
Mar. 2008 Tools used for the beam commissioning of J-PARC LINAC 14
3. Beam Based Calibration
BBC/BBABeam Based Calibration/AlignmentFind the offset between beam center & Q magnetic field
Device used for BBC
Steerer(scanned)
BPM(under calib.) BPM
to detect deflection
Quad(scanned)
Beam
BPMto detect deflection
MeasurementValidation
Mar. 2008 Tools used for the beam commissioning of J-PARC LINAC 15
3. Beam Based Calibration Application:
Automated application using XAL framework
Scan Parameter for Steering
Scan Parameter for Quad
Raw Data(by BPM)
Monitored Beam Current
Scan controller & raw data
Raw Data(by SCT)
Mar. 2008 Tools used for the beam commissioning of J-PARC LINAC 16
3. Beam Based Calibration Weighted linear fitting result
Algorithm: Least Square Method
BP
M r
eado
ut (
unde
r ca
lib).
Beam deflection for a unit quad variation
Find the corresponding BPM readout Find the setting where the beam is not deflected by varying the quad.
The deviation of the electric center from the field center is found to be typically less than 0.2 mm (max. 0.6 mm).
Mar. 2008 Tools used for the beam commissioning of J-PARC LINAC 17
4. Summary
HLA for J-PARC LINACJCE + XAL
2 typical applications used in J-PARC LINACTuning of RF amplitude and phase
Automated application Before 3-man-hour for one cavities: coarse tuning & rou
gh result Now 1-man-0.5hour: fine tuning & accurate result
Beam based calibration Performed for 12 sampled BPM’s. Use singlet Q magnet
Effective beam commissioning with the aid of HLA tools.
Recommended