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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. 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

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tools used for the beam commissioning of j parc linac

Tools used for the beam commissioning of J-PARC LINAC

Guobao SHEN

J-PARC CenterJapan Atomic Energy Agency

Mar. 2008

content
Content
  • HLA Environment
  • Tuning of RF Amplitude and Phase
  • Beam Base Calibration
  • Summary

Tools used for the beam commissioning of J-PARC LINAC

1 hla environment
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

2 tuning of rf amplitude and phase

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

slide5

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

2 tuning of rf amplitude and phase1
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

slide7

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

2 tuning of rf amplitude and phase2
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

2 tuning of rf amplitude and phase3
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

2 tuning of rf amplitude and phase4
2. Tuning of RF Amplitude and Phase
  • RF tuning: Beam energy curves

Tools used for the beam commissioning of J-PARC LINAC

2 tuning of rf amplitude and phase5
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

2 tuning of rf amplitude and phase6
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

2 tuning of rf amplitude and phase7
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

3 beam based calibration
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

3 beam based calibration1
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

3 beam based calibration2
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

4 summary
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