Design of a side coupled standing wave accelerating tube for NSTRI e-Linac

Zarei, Sara; Davani, F. Abbasi; Rachti, M. Lamehi; Ghasemi, Farshad

doi:10.1088/1748-0221/12/09/p09026

Cited by 4 publications

(5 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The designed cavities are in such a way as to increase the shunt impedance of cavities, which leads to achieving an increment of the acceleration efficiency in the tube and also does not occur electrical breakdown in the tube. Table 1 presents thedesirable tube's detailed specifications [4].…”

Section: Jinst 18 T10006mentioning

confidence: 99%

“…Beam dynamics studies have been carried out by using ASTRA [7]. The results of studies, simulations and designs are in the references [4,[8][9][10].…”

Section: Jinst 18 T10006mentioning

confidence: 99%

“…After the design of the tube, the mechanical drawings of it were prepared [4]. As manufacturing the entire tube at once is impossible, all cavities were constructed separately and then connected.…”

Section: Construction Of the Prototype Tubementioning

confidence: 99%

See 2 more Smart Citations

Construction and measurement of the prototype side-coupled standing-wave tube for electron Linac

Zarei,

Ghasemi,

Sanaye Hajari

et al. 2023

J. Inst.

View full text Add to dashboard Cite

Due to Iran's growing need for accelerators in various applications, NSTRI (Nuclear Science and Technology Research Institute) has defined a 6 MeV e-Linac (electron linear accelerator) project for medical and inspection applications. This electron accelerator has a side-coupled standing wave tube that operates in π/2 mode at the frequency of 2998.5 MHz. This paper presents a summary of the construction and cold test stage of the prototype tube for this accelerator. The prototype tube was constructed from aluminum and clamped with bolts.In the cold test stage, low-power RF measurements werecarried out using a side-coupled cavity tuning method and a bead-pull measurement technique. Using a network analyzer, magnetic and electric probes, and a mechanical structure constructed for this tube made the RF tuning possible. After tuning, the resonant frequency, unloaded quality factor, and effective shunt impedance of the aluminum tube were achieved at 2998.57 MHz, 7970, and 83.25 MΩ/m respectively.

show abstract

Section: Jinst 18 T10006mentioning

confidence: 99%

“…Beam dynamics studies have been carried out by using ASTRA [7]. The results of studies, simulations and designs are in the references [4,[8][9][10].…”

Section: Jinst 18 T10006mentioning

confidence: 99%

See 1 more Smart Citation

Construction and measurement of the prototype side-coupled standing-wave tube for electron Linac

Zarei,

Ghasemi,

Sanaye Hajari

et al. 2023

J. Inst.

View full text Add to dashboard Cite

show abstract

“…At the first step, the cavity was designed in accordance with the appropriate electromagnetic characteristics and its dimensions were obtained as well [1]. The aforementioned design was done in the s band for the 2998.5 MHz frequency in the π 2 mode for the side-coupled cavity.…”

Section: Thermal Analysis and Design Of Cavity Cooling Systemmentioning

confidence: 99%

“…Designing and manufacturing standing wave cavities is aimed at the development of their employment in a variety of linear accelerators with medical, cargo inspection and radioisotope production applications. Nuclear Science and Technology Research Institute (NSTRI) has begun extensive research in this area [1,2]. After constructing traveling wave linac (IPM e-linac) [3][4][5], the production of smaller and sealed accelerators is a priority for the above mentioned applications.…”

Section: Introductionmentioning

confidence: 99%

Multiphysics analysis of side-coupled RF cavity

Kejani¹,

Ghasemi²,

Davani³

et al. 2019

J. Inst.

Self Cite

View full text Add to dashboard Cite

A: By changing the resonant frequency of the cavity due to the power dissipation in its wall, the impedance matching will impair and the power will reflect. The acceptable frequency shift range which is based on the cooling system in the cavity design depends on the ability of the automatic frequency controller system and the bandwidth of the RF amplifier output frequency. This paper describes how to couple electromagnetic, thermal and mechanical analysis and calculates the cavity frequency shift during operation. Multiphysics analysis investigations had done for an S-band side-coupled cavity. By using the Superfish code, the power loss ratio at different surfaces of the cavity could be accurately calculated and Steady-State Thermal (SST) analysis could be performed correctly. In this paper, the report on the simultaneous use of multiphysics analysis with the modules of the Ansys software is presented and the results of both simulations are compared. The temperature distribution of the cavity was obtained by using the Fluent software and its results were compared with the temperature distribution gained from applying the convection coefficient to the SST. Three cooling systems were investigated for different powers with different cross-sections. In this section of the investigation, after thermal analysis, deformed geometry was obtained due to thermal stresses. By electromagnetic analyzing of deformed geometry, its frequency shift was obtained for all different cases. In order to evaluate the simulations, after the construction of a single-cavity, frequency variations are measured in terms of temperature variation and the results are compared with each other. After constructing a single-cavity, frequency shifts based on temperature variations are measured and the results are compared with each other. K: Acceleration cavities and magnets superconducting (high-temperature superconductor; radiation hardened magnets; normal-conducting; permanent magnet devices; wigglers and undulators); Accelerator modelling and simulations (multi-particle dynamics; single-particle dynamics);

show abstract

A tuning method based on the coupled mode frequencies in biperiodic coupled-cavity linear accelerator

Zhou

Zhang³

et al. 2018

Review of Scientific Instruments

View full text Add to dashboard Cite

A coupled-cavity linac (CCL) is widely used around the world in many fields. The radio frequency design is always a fundamental and crucial problem in CCL. In biperiodic structures, especially side-coupled structures, entirely different structures between accelerating cavities (ACs) and coupled cavities (CCs) will cause different frequency drops (δf) with the introduction of coupling slots. In order to achieve precise and consistent frequencies in each cell, the rule of individual cavity frequency drops should be figured out. A model of lumped resonant circuits is chosen to provide accurate prediction for normal mode frequencies. Through solving equivalent circuit equations, a parameter called frequency gap difference (ΔFg) is proposed, whose value is directly proportional to the frequency difference (df) between AC and CC and the ratio is one-to-one when AC frequency ( fa) is close to CC frequency ( fc). Based on the property of ΔFg, a simplified method on how to design and tune a triplet CCL is proposed; instead of tuning each individual cell, the new method only requires measuring the frequencies of the coupled normal modes, which considerably simplifies the tuning process and reduces the turn-around time. The particular design flow and tuning method have been successfully applied in the Nanjing University CCL Project. In addition, through comparing cavities with and without coupling slots, the value of frequency drops with different coupling coefficients is revealed and analyzed.

show abstract

Design of a side coupled standing wave accelerating tube for NSTRI e-Linac

Cited by 4 publications

References 18 publications

Construction and measurement of the prototype side-coupled standing-wave tube for electron Linac

Construction and measurement of the prototype side-coupled standing-wave tube for electron Linac

Multiphysics analysis of side-coupled RF cavity

A tuning method based on the coupled mode frequencies in biperiodic coupled-cavity linear accelerator

Contact Info

Product

Resources

About