rf measurements and tuning of the 750 MHz radio frequency quadrupole

Koubek, Benjamin; Timmins, Marc

doi:10.1103/physrevaccelbeams.20.080102

Cited by 25 publications

(23 citation statements)

References 6 publications

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“…After each tuner was inserted, the accelerating field was measured to obtain the field variations at the measurement positions. Singular value decomposition can be used to invert the response matrix [24].…”

Section: Tuning Algorithmmentioning

confidence: 99%

Fabrication and cold test of prototype of spatially periodic radio frequency quadrupole focusing linac

Zhang

Wang

et al. 2021

NUCL SCI TECH

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A 325 MHz aluminum prototype of a spatially periodic rf quadrupole focusing linac was developed at the Institute of Modern Physics, Chinese Academy of Sciences, as a promising candidate for the front end of a high-current linac. It consists of an alternating series of crossbar H-type drift tubes and rf quadrupole sections. Owing to its special geometry, cavity fabrication is a major hurdle for its engineering development and application. In this paper, we report the detailed mechanical design of this structure and describe its fabrication process, including machining, assembly, and inspection. The field distribution was measured by the bead-pull technique. The results show that the field errors of both the accelerating and focusing fields are within an acceptable range. A tuning scheme for this new structure is proposed and verified. The cold test process and results are presented in detail. The development of this prototype provides valuable guidance for the application of the spatially periodic rf quadrupole structure.

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Section: Tuning Algorithmmentioning

confidence: 99%

Fabrication and cold test of prototype of spatially periodic radio frequency quadrupole focusing linac

Zhang

Wang

et al. 2021

NUCL SCI TECH

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“…Both methodology and choices of the rf design of the four-vane Carbon-RFQ were adapted from the HF-RFQ [7][8][9][10][11] and PIXE-RFQ [9,[12][13][14]-the obvious exception being the novel dipole mode detuning discussed in Section III A. Here, we summarize the remaining rf design considerations, including cavity geometry (Section IV A), maximum surface electric field (Section IV B), auxiliaries and power couplers (IV C), and thermal simulations (IV D).…”

Section: Rf Designmentioning

confidence: 99%

“…18). The slightly shorter (5λ) HF-RFQ has been successfully tuned with this configuration [10]. Each slug features a movement range of ±11 mm with respect to nominal, such that the available frequency tuning range amounts to ±11 MHz.…”

Section: Tuning Systemmentioning

confidence: 99%

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750 MHz radio frequency quadrupole with trapezoidal vanes for carbon ion therapy

Bencini,

Pommerenke,

Grudiev

et al. 2020

Preprint

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High-frequency linear accelerators are very suitable for carbon ion therapy, thanks to the reduced operational costs and the high beam quality with respect to synchrotrons, which are presently the only available technology for this application. In the framework of the development of a new linac for carbon ion therapy, this article describes the design of a compact 750 MHz Radio Frequency Quadrupole (RFQ) with trapezoidal vanes. A new semi-analytic approach to design the trapezoidalvane RFQ is introduced together with the relevant beam dynamics properties. The RFQ is split into two decoupled rf cavities, both of which make use of a novel dipole detuning technique by means of length adjustment. The splitting is described both from the rf and the beam dynamics point of view. The paper concludes with the rf design of the full structure, including maximum surface field and thermal studies.

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“…After successful design, construction, and commissioning of the HF-RFQ, a compact 750 MHz radio-frequency quadrupole (RFQ) for medical applications [1][2][3][4][5][6][7][8], CERN initiated the development of a new RFQ operating at this high frequency in mid-2017. The so-called PIXE-RFQ [3,[8][9][10][11] will accelerate protons to 2 MeV over a length of one meter only.…”

Section: Introductionmentioning

confidence: 99%

rf measurements and tuning of the 1-meter-long 750 MHz radio-frequency quadrupole for artwork analysis

Pommerenke,

van Rienen,

Grudiev

2020

Preprint

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The 750 MHz PIXE-RFQ (radio-frequency quadrupole), developed and built at CERN, provides 2 MeV protons over a length of one meter for proton-induced X-ray emission analysis (PIXE) of cultural heritage artwork. In this paper, we report low-power rf measurements and tuning of the PIXE-RFQ, which have been completed mid-2020. Using a novel algorithm based on direct measurements of the response matrix, field and frequency could tuned at the same time in only two steps to satisfying accuracy. Additionally, we report measurements of single modules, quality factors, and coupling strength. In all cases, very good agreement between rf measurement and design values was observed.

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rf measurements and tuning of the 750 MHz radio frequency quadrupole

Cited by 25 publications

References 6 publications

Fabrication and cold test of prototype of spatially periodic radio frequency quadrupole focusing linac

Fabrication and cold test of prototype of spatially periodic radio frequency quadrupole focusing linac

750 MHz radio frequency quadrupole with trapezoidal vanes for carbon ion therapy

rf measurements and tuning of the 1-meter-long 750 MHz radio-frequency quadrupole for artwork analysis

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