Some Methods of the Stop-Band Width Evaluation in Tihe Compensated Accelerating Structures

Gonin, I.; Kravchuk, L.; Paramonov, V.; Romanov, Gennady; Fedoseev, A. I.

doi:10.1109/tns.1985.4334192

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…where f u and f l are the higher and lower modes nearest to the =2 mode, respectively [10]. Table VII lists the frequency shifts due to the brazing process.…”

Section: Frequency Shift Due To Brazingmentioning

confidence: 99%

First high-power model of the annular-ring coupled structure for use in the Japan Proton Accelerator Research Complex linac

Yamazaki

2012

Phys. Rev. ST Accel. Beams

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A prototype cavity for the annular-ring coupled structure (ACS) for use in the Japan Proton Accelerator Research Complex (J-PARC) linac has been developed to confirm the feasibility of achieving the required performance. This prototype cavity is a buncher module, which includes ten accelerating cells in total. The ACS cavity is formed by the silver brazing of ACS half-cell pieces stacked in a vacuum furnace. The accelerating cell of the ACS is surrounded by a coupling cell. We, therefore, tuned the frequencies of the accelerating and coupling cells by an ultraprecision lathe before brazing, taking into account the frequency shift due to brazing. The prototype buncher module was successfully conditioned up to 600 kW, which corresponds to an accelerating field that is higher than the designed field of 4:1 MV=m by 30%. We describe the frequency-tuning results for the prototype buncher module and its high-power conditioning.

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“…where f u and f l are the higher and lower modes nearest to the =2 mode, respectively [10]. Table VII lists the frequency shifts due to the brazing process.…”

Section: Frequency Shift Due To Brazingmentioning

confidence: 99%

First high-power model of the annular-ring coupled structure for use in the Japan Proton Accelerator Research Complex linac

Yamazaki

2012

Phys. Rev. ST Accel. Beams

View full text Add to dashboard Cite

show abstract

“…where f u is the nearest higher mode to the =2 mode and f l is the nearest lower mode to the =2 mode [12]. Table VI lists the frequency shifts due to brazing.…”

Section: Frequency Shift Due To Brazingmentioning

confidence: 99%

First annular-ring coupled structure cavity for the Japan Proton Accelerator Research Complex linac

Ueno

Hirano

et al. 2012

Phys. Rev. ST Accel. Beams

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The first annular-ring coupled structure (ACS) cavity for the Japan Proton Accelerator Research Complex (J-PARC) linac has been developed in order to confirm and establish its fabrication processes. This cavity includes 34 accelerating cells, which is 3.4 times as many as the prototype cavity (buncher) of the J-PARC ACS. The cell frequencies before brazing were tuned within the required accuracies. After brazing, the accelerating-and coupling-mode frequencies were 972.19 and 972.63 MHz on average, respectively, which were higher than the operating frequency of 972 MHz. Although the acceleratingmode frequency can be corrected to 972 MHz using adjustable plungers, these frequency errors adversely affected the on-axis electric field. This cavity was successfully conditioned up to 1.6 MW. This power corresponds to an accelerating field of 4:7 MV=m, which is 10% higher than the design value of 4:2 MV=m. In order to find the issue caused by the excited coupling cells, this cavity was also conditioned at the higher and lower frequencies that were detuned from the operating frequency of 972 MHz. Here we present the frequency tuning processes, the low-level rf measurements, and the high-power test results. We also discuss the most reasonable scenario for frequency tuning in future work.

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Some Methods of the Stop-Band Width Evaluation in Tihe Compensated Accelerating Structures

Cited by 2 publications

References 3 publications

First high-power model of the annular-ring coupled structure for use in the Japan Proton Accelerator Research Complex linac

First high-power model of the annular-ring coupled structure for use in the Japan Proton Accelerator Research Complex linac

First annular-ring coupled structure cavity for the Japan Proton Accelerator Research Complex linac

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