Tools used for the beam commissioning of J-PARC LINAC

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

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

4. 3 MeV 181 MeV 50 MeV 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) Tools used for the beam commissioning of J-PARC LINAC

5. 2. Tuning of RF Amplitude and Phase • RF tuning scheme for DTL • Simulated Energy Curves @ 11 different tank levels are shown. • 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. DTL1 Tank level: 1.00 (design) Beam Energy Acceptance Tools used for the beam commissioning of J-PARC LINAC

6. 2. Tuning of RF Amplitude and Phase • FCT monitor configuration for DTL TOF Pair for DTL3 Apart by ~ 21  TOF Pair for DTL1 Apart by ~ 52  DTL1 DTL2 DTL3 SDTL1A SDTL1B SDTL2A SDTL2B Beam TOF Pair for DTL2 Apart by ~ 31  FCT (Fast Current Transformer) Tools used for the beam commissioning of J-PARC LINAC

7. 2. Tuning of RF Amplitude and Phase • RF tuning scheme for SDTL Energy gain SDTL1 Tank level Injection energy Simulated phase scan curves for 5 different tank levels are shown. • Phase scan curve is similar sinusoid. • RF tuned comparing measurement with simulation, same idea with DTL • Similar scheme for BUNCHER & DEBUNCHER. Tools used for the beam commissioning of J-PARC LINAC

8. 2. Tuning of RF Amplitude and Phase • FCT monitor configuration for SDTL Long TOF pair apart by ~21 DTL3 SDTL1A SDTL1B SDTL2A SDTL2B SDTL3A SDTL3B Beam Short TOF pair apart by ~2 Klystron Klystron Klystron Phase scan 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. Tools used for the beam commissioning of J-PARC LINAC

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

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

11. 2. Tuning of RF Amplitude and Phase • RF tuning • Signaturematchingwith PARMILA model • Deviationof measuredphase scancurvefrom model Signature matching for SDTL01 Set-point  Tools used for the beam commissioning of J-PARC LINAC

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

13. 2. Tuning of RF Amplitude and Phase Jan. 2007 RUN3 Sep. 2007 RUN9 The tuning accuracy is substantially improved by fine tuning. The energy deviation from each SDTL module is mostly less than 0.3 %. Larger deviation than expected. To be further investigated. Tools used for the beam commissioning of J-PARC LINAC

14. 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) Quad (scanned) Beam BPM (under calib.) BPM to detect deflection BPM to detect deflection MeasurementValidation Tools used for the beam commissioning of J-PARC LINAC

15. 3. Beam Based Calibration • Application: • Automated application using XAL framework Scan controller & raw data Scan Parameter for Steering Raw Data (by SCT) Scan Parameter for Quad Monitored Beam Current Raw Data (by BPM) Tools used for the beam commissioning of J-PARC LINAC

16. 3. Beam Based Calibration • Weighted linear fitting result • Algorithm: Least Square Method Find the setting where the beam is not deflected by varying the quad. Find the corresponding BPM readout BPM readout (under calib). Beam deflection for a unit quad variation The deviation of the electric center from the field center is found to be typically less than 0.2 mm(max. 0.6 mm). Tools used for the beam commissioning of J-PARC LINAC

17. 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 BPM’s. • Use singlet Q magnet • Effective beam commissioning with the aid of HLA tools. Tools used for the beam commissioning of J-PARC LINAC