Beam dynamics design of a new radio frequency quadrupole for beam-current upgrade of the Japan Proton Accelerator Research Complex linac

Kondo, Yasuhiro; Hasegawa, K.; Morishita, T.; Jameson, Robert

doi:10.1103/physrevstab.15.080101

Cited by 16 publications

(12 citation statements)

References 3 publications

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“…For a qualitative analysis in light of the physics involved, we can rewrite the expression for the radial focusing parameter [7]. According to the theory of RFQ beam dynamics, the radial focusing parameter B [8] is given by…”

Section: A Beam Dynamics Designmentioning

confidence: 99%

Design, fabrication, and beam commissioning of a continuous-wave four-rod rf quadrupole

Yin¹,

Yuan²,

Xia³

et al. 2016

Phys. Rev. Accel. Beams

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A new heavy-ion linac within a continuous-wave (CW) 4-rod radio-frequency quadrupole (RFQ) was designed and constructed as the injector for the separated-sector cyclotron (SSC) at the Heavy Ion Research Facility at Lanzhou (HIRFL). In this paper, we present the development of and the beam commissioning results for the 53.667 MHz CW RFQ. In the beam dynamics design, the transverse phase advance at zero current, σ 0⊥ , is maintained at a relatively high level compared with the longitudinal phase advance (σ 0∥) to avoid parametric resonance. A quasi-equipartitioning design strategy was applied to control the emittance growth and beam loss. The installation error of the electrodes was checked using a FARO 3D measurement arm during the manufacturing procedure. This method represents a new approach to measuring the position shifts of electrodes in a laboratory environment and provides information regarding the manufacturing quality. The experimental results of rf measurements exhibited general agreement with the simulation results obtained using CST code. During on-line beam testing of the RFQ, two kinds of ion beams (40 Ar 8þ and 16 O 5þ) were transported and accelerated to 142.8 keV=u, respectively. These results demonstrate that the SSC-Linac has made a significant progress. And the design scheme and technology experiences developed in this work can be applied to other future CW RFQs.

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Section: A Beam Dynamics Designmentioning

confidence: 99%

Design, fabrication, and beam commissioning of a continuous-wave four-rod rf quadrupole

Yin¹,

Yuan²,

Xia³

et al. 2016

Phys. Rev. Accel. Beams

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“…To demonstrate the performance of the RF-driven ion source and the RFQ before installation into the linac, we constructed the FE-TS, which comprised an ion source and an RFQ for a peak current of 50 mA [4], as shown in Fig. 4.…”

Section: New Front-end Test Standmentioning

confidence: 99%

Development Status of Ion Source at J-PARC Linac Test Stand

Yamazaki

Takagi

Ikegami

et al. 2015

Proceedings of the 2nd International Symposium on Science at J-Parc — Unlocking the Mysteries of Life, Matter and the Universe

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The Japan Proton Accelerator Research Complex (J-PARC) linac power upgrade program is now in progress in parallel with user operation. To realize a nominal performance of 1 MW at 3 GeV Rapid Cycling Synchrotron and 0.75 MW at the Main Ring synchrotron, we need to upgrade the peak beam current (50 mA) of the linac. For the upgrade program, we are testing a new front-end system, which comprises a cesiated RF-driven H − ion source and a new radio -frequency quadrupole linac (RFQ). The H − ion source was developed to satisfy the J-PARC upgrade requirements of an H − ion-beam current of 60 mA and a lifetime of more than 50 days. On February 6, 2014, the first 50 mA H − beams were accelerated by the RFQ during a beam test. To demonstrate the performance of the ion source before its installation in the summer of 2014, we tested the long-term stability through continuous beam operation, which included estimating the lifetime of the RF antenna and evaluating the cesium consumption.

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“…In the design of RFQ III, the conventional constant-r 0 and -V design was adopted, and the equipartitioning was implemented only in the GB [6]. However, we accumulated a lot of experience through the fabrication of RFQ III and established an effective tuning method.…”

Section: Introductionmentioning

confidence: 99%

“…Design parameters of epRFQ obtained with LINACSrfqDES. As a reference, the parameters of RFQ III[6] are also shown.…”

mentioning

confidence: 99%

Development of a radio frequency quadrupole linac implemented with the equipartitioning beam dynamics scheme

Kondo

Morishita

Jameson

2019

Phys. Rev. Accel. Beams

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Radio frequency quadrupole linac (RFQ) is the key component which realized modern high-current proton linacs, however, many RFQs are designed based on very conventional design schemes. We developed 3-MeV 50-mA H − (negative hydrogen) RFQ based on a beam space-charge physics concept. The equipartitioning scheme, which is widely used in the high intensity linac design, is implemented into the RFQ design. Design performances of 99.1% transmission, 0.24π mm mrad transverse normalized rms emittance, and 0.11π MeV deg for longitudinal direction are achieved with a vane length of 3 m and the final energy of 3 MeV. An RFQ employing this design concept was fabricated, and the design performance was confirmed by beam commissioning. In this paper, the design and result of the beam commissioning of this fully equipartitioned RFQ are described.

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Beam dynamics design of a new radio frequency quadrupole for beam-current upgrade of the Japan Proton Accelerator Research Complex linac

Cited by 16 publications

References 3 publications

Design, fabrication, and beam commissioning of a continuous-wave four-rod rf quadrupole

Design, fabrication, and beam commissioning of a continuous-wave four-rod rf quadrupole

Development Status of Ion Source at J-PARC Linac Test Stand

Development of a radio frequency quadrupole linac implemented with the equipartitioning beam dynamics scheme

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