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Tools used for the beam commissioning of J-PARC LINAC Guobao SHEN J-PARC Center Japan Atomic Energy Agency Mar. 2008.

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Presentation on theme: "Tools used for the beam commissioning of J-PARC LINAC Guobao SHEN J-PARC Center Japan Atomic Energy Agency Mar. 2008."— Presentation transcript:

1 Tools used for the beam commissioning of J-PARC LINAC Guobao SHEN J-PARC Center Japan Atomic Energy Agency Mar. 2008

2 Tools used for the beam commissioning of J-PARC LINAC2 Content HLA Environment Tuning of RF Amplitude and Phase Beam Base Calibration Summary

3 Mar Tools used for the beam commissioning of J-PARC LINAC3 1. HLA Environment High Level App Environment for J-PARC Yamamoto-sans Talk HLA Environment for J-PARC LINAC XAL RF tuning Beam Based Calibration/Alignment Orbit correction Beam energy analyzer Save and Restore DB …Others JCE (Wrapper XAL, Script Language) Transverse matching …Others

4 Mar Tools used for the beam commissioning of J-PARC LINAC4 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 MeV50 MeV181 MeV

5 Mar Tools used for the beam commissioning of J-PARC LINAC5 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 11 different tank levels are shown. Beam Energy Acceptance

6 Mar Tools used for the beam commissioning of J-PARC LINAC6 2. Tuning of RF Amplitude and Phase FCT monitor configuration for DTL SDTL1ASDTL1BDTL3SDTL2A Beam SDTL2BDTL2DTL1 TOF Pair for DTL3 Apart by ~ 21 FCT (Fast Current Transformer) TOF Pair for DTL2 Apart by ~ 31 TOF Pair for DTL1 Apart by ~ 52

7 Mar Tools used for the beam commissioning of J-PARC LINAC7 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

8 Mar Tools used for the beam commissioning of J-PARC LINAC8 SDTL2ASDTL2BSDTL3A Beam SDTL3BDTL3SDTL1ASDTL1B Klystron Phase scan Long TOF pair apart by ~21 Short TOF pair apart 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

9 Mar Tools used for the beam commissioning of J-PARC LINAC9 Beam Current (by SCT Monitor) 2. Tuning of RF Amplitude and Phase RF tuning: Automated application using XAL framework Same for all cavities Beam Phase (by FCT Monitor) Scan controller & raw data

10 Mar Tools used for the beam commissioning of J-PARC LINAC10 2. Tuning of RF Amplitude and Phase RF tuning: Beam energy curves

11 Mar Tools used for the beam commissioning of J-PARC LINAC11 2. Tuning of RF Amplitude and Phase RF tuning Signature matching with PARMILA model Deviation of measured phase scan curve from model Set-point Signature matching for SDTL01

12 Mar Tools used for the beam commissioning of J-PARC LINAC12 Final scan Solid line: simulation; Maker: measurement 2. Tuning of RF Amplitude and Phase SDTL1 SDTL8 SDTL15 (From manual to automation)

13 Mar Tools used for the beam commissioning of J-PARC LINAC13 RUN9RUN3 Larger deviation than expected. To be further investigated. Jan. 2007Sep 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

14 Mar Tools used for the beam commissioning of J-PARC LINAC14 3. Beam Based Calibration BBC/BBA Beam Based Calibration/Alignment Find the offset between beam center & Q magnetic field Device used for BBC Steerer (scanned) BPM (under calib.) BPM to detect deflection Quad (scanned) Beam BPM to detect deflection Measurement Validation

15 Mar Tools used for the beam commissioning of J-PARC LINAC15 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)

16 Mar Tools used for the beam commissioning of J-PARC LINAC16 3. Beam Based Calibration Weighted linear fitting result Algorithm: Least Square Method BPM readout (under calib). 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).

17 Mar Tools used for the beam commissioning of J-PARC LINAC17 4. Summary HLA for J-PARC LINAC JCE + XAL 2 typical applications used in J-PARC LINAC Tuning of RF amplitude and phase Automated application Before 3-man-hour for one cavities: coarse tuning & rough result Now 1-man-0.5hour: fine tuning & accurate result Beam based calibration Performed for 12 sampled BPMs. Use singlet Q magnet Effective beam commissioning with the aid of HLA tools.


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