Radio frequency cavity analysis, measurement, and calibration of absolute Dee voltage for K-500 superconducting cyclotron at VECC, Kolkata

Som, Sumit; Seth, Sudeshna; Mandal, Abhijit; Paul, Saikat; Duttagupta, A.

doi:10.1063/1.4789784

Cited by 8 publications

(5 citation statements)

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“…The unloaded quality factor Q 0 has been determined from the 3 dB bandwidth measurement made with a Vector Network Analyzer (VNA). As expected also from other analyses in literature [15,16,22,23], the measured quality factor is less than the simulated values due to many factors: sliding contact, losses to brazed and welded joints, temperature increase, surface oxidation and cleaning, etc. A mismatch ranging from 16 to 30% is shown in Figure 9.…”

Section: Quality Factorsupporting

confidence: 80%

“…Moreover, the electromagnetic field results presented in this work will be provided to a novel 3D particle dynamics code. RF modeling and simulations of this kind of cavities are present in literature [11][12][13][14][15][16][17]. In this work, the electromagnetic simulations have been carried out through two commercial simulation softwares, COMSOL Multyphysics 5.4 [18] and CST Microwave Studio 2020 [19], using both the "eigenmode" and "driven" solvers.…”

Section: Introductionmentioning

confidence: 99%

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Electromagnetic Simulations and Measurements of the K-800 Superconducting Cyclotron RF Cavity at INFN-LNS

et al. 2021

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In this paper, a complete three-dimensional (3D) RF model of the cyclotron coaxial resonator—including the coaxial sliding shorts, the “Liner” vacuum chamber, the coupler, the trimmer, and the high RF voltage “Dee” structures—has been developed. An eigenmode analysis was used to simulate the tuning of the resonator in the operating frequency range of 15–48 MHz obtained by two movable sliding shorts and a trimmer. A driven analysis has been performed in order to compute the |S11| parameter (or impedance matching) of the cavity excited by a movable coaxial power coupler. The numerical simulations have been performed using the different peculiarities of two commercial tools, COMSOL Multiphysics and CST microwave studio. Experimental validation of the developed model is presented. The evidence of an unwanted electric field component, orthogonal to the accelerating field, was discovered and a mitigation is also proposed. The impact of the proposed modification was evaluated by using a 3D beam dynamics code under development in the framework of the Superconducting Cyclotron upgrade ongoing at INFN-LNS.

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Section: Quality Factorsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Electromagnetic Simulations and Measurements of the K-800 Superconducting Cyclotron RF Cavity at INFN-LNS

et al. 2021

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“…Successful beam extraction from the K500 superconducting cyclotron (SCC) at the Variable Energy Cyclotron Centre (VECC), Kolkata, has greatly enhanced the opportunities of nuclear physics research in India. The cyclotron is designed for beam energy of 10-60 MeV/A for A ≤ 100 and 5-20 MeV/A for A ∼ 200, and its general features have been described elsewhere [1][2][3][4]. The basic design is similar to the K500 cyclotrons at NSCL and Texas A&M [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

A beam dynamics study for efficient extraction from the VECC K500 superconducting cyclotron

Paul¹,

Bhunia²,

Debnath³

et al. 2022

J. Inst.

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Beam extraction from the K500 superconducting cyclotron is very challenging due to its long extraction path of about 330° with very high magnetic field gradient and low acceptance. The initial attempts of beam extraction showed that the pilot beams could successfully clear only a few magnetic channels. To investigate the causes of the beam loss, magnetic field measurements in different zones of the cyclotron were repeated. The total field has been generated by superposition of the measured field and the numerically computed field of the extraction elements. Based on these data, extensive beam dynamics simulation has been carried and beam distribution at the entry of the extraction path obtained by accelerated orbit calculations. The energy spread due to multi-turn deflector entry has been included in the simulation. The beam envelope along the extraction path as well as the beam transmission efficiency has been determined for different positions of the extraction elements. The radial positions of the extraction elements have been optimized parametrically to compute the maximum transmission efficiency. The present studies have enabled us to successfully extract the pilot beam (N4+) from the cyclotron with beam current of around 20 enA.

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“…Sec ond, a super con duct ing coil pro vides ~3 T mag netic field around the RF cav ity dur ing 80 kW op er a tion, which may af fect elec tri cal per for mance of X-ray de tec tor. Tak ing into ac count these two rea sons, it is con ve nient to make the X-ray mea sure ment in the in de pend ent RF cav ity with 20 kW power test [5]. The de sign of X-ray mea sure ment is in tro duced in sec tion De sign of X-ray mea sure ment.…”

Section: Introductionmentioning

confidence: 99%

X-ray calibration of Dee voltage of radiofrequency cavity based on a low-power test

et al. 2019

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Radio fre quen cy cav ity is one of the most crit i cal and com pli cated com po nents in a cy clo tron. Dee volt age of radio fre quen cy cav ity ac cel er ates charged par ti cles to achieve re quired en ergy. Peak volt age of Dee is the key pa ram e ter of an radio fre quen cy cav ity. Bal anced Dee volt age is very im por tant for ef fec tive beam can ter ing and beam ex tract ing. An X-ray mea sure ment has been made to cal i brate and ver ify the peak volt age of Dee in a low-power (~20 kW) test. The X-ray mea sure ment for radio fre quen cy cav ity was de signed by means of brems strah lung. A suit able shield ing cover was cho sen for radio fre quen cy cav ity and the X-ray mea sure ment design was dem on strated ac cord ing to the the ory of pho ton trans mis sion. Fi nally, the peak voltage of Dee was ob tained at the power of 10-20 kW and the bal ance of Dee volt age was ver ified.

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Radio frequency cavity analysis, measurement, and calibration of absolute Dee voltage for K-500 superconducting cyclotron at VECC, Kolkata

Cited by 8 publications

References 1 publication

Electromagnetic Simulations and Measurements of the K-800 Superconducting Cyclotron RF Cavity at INFN-LNS

Electromagnetic Simulations and Measurements of the K-800 Superconducting Cyclotron RF Cavity at INFN-LNS

A beam dynamics study for efficient extraction from the VECC K500 superconducting cyclotron

X-ray calibration of Dee voltage of radiofrequency cavity based on a low-power test

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