Radio Frequency Study of S-band Side Coupled Accelerating Structure

Authors

  • M. A. Aleem PINSTECH
  • M. A. Khan PINSTECH
  • R. Khalid PINSTECH
  • I. Mahmood PINSTECH

Abstract

Currently, PINSTECH is developing S-band electron linear accelerator (LINAC) for medical applications. The side coupled accelerating structure (SCAS) was selected for electron acceleration process in the LINAC due to its compactness and high efficiency. The basic concept of SCAS was derived from the design of biperiodic chain of coupled cavities already published in the literature. This study focuses on the conceptual design realization and optimization of the structure through radio frequency (RF) simulations. COMSOL electromagnetic solver was used for the RF simulation work. The working frequency and excitation mode were selected as 2998 MHz and π/2, respectively. The design process of SCAS is stepwise explained starting from unit section to the complete stack of unit sections. The coupling iris was optimized to transfer maximum RF power to the structure. The electric field profile on the axis of SCAS was successfully optimized to achieve the field flatness. Subsequently, the characteristic parameters were derived directly through post processing of the simulation results.

Author Biography

M. A. Aleem, PINSTECH

Principal Scientist

References

F.G. Yao, P.Y. Ji, W. Lin, Z.S. Cai, W.C. Feng, J. Kai and L.W. Min, “Physical Design of a 10 MeV Linac for Polymer Radiation Processingâ€, Chinese Physics C, vol. 33 (Suppl. II), pp. 135-138, 2009.

A. Sasan, A.D. Fereidoon, G. Rohollah, G. Farshad, L.R. Mohammad and Zarei, Sara, “Design and Simulation of Side Coupled Six MeV Linac for X-ray Cargo Inspectionâ€, 5th International Particle Accelerator Conference IPAC2014, Dresden, Germany, JACoW Publishing, pp. 3844-3846, 2014.

S. Hanna, RF Linear Accelerators for Medical and Industrial Applications, 1st edition London: Artech House, March 31, 2012.

D.E. Nagle, E.A. Knapp, and B.C. Knapp, “Coupled Resonator Model for Standing Wave Accelerator Tanksâ€, Rev. Sci. Instrum. Vol. 38, pp. 1583-1587, 1967.

E.A. Knapp, B.C. Knapp, and J.M. Potter, “Standing Wave High Energy Linear Accelerator Structuresâ€, Rev. Sci. Instrum., Vol. 39, pp. 979-991, 1968

T.P. Wangler, RF Linear Accelerators, New York, John Wiley & Sons, pp.102, 1998.

R. Orecchia, A. Zurlo, A. Loasses, M. Krengli, G. Tosi, S. Zurrida, P. Zucali and U. Veronesi, “Particle beam therapy (hadrontherapy): basis for interest and clinical experienceâ€, European Journal of Cancer, vol. 34, pp. 459-468, Mar 1998.

U. Amaldi, S. Braccini and P. Puggioni, “High Frequency Linacs for Hadron Therapyâ€, Reviews of Accelerator Science and Technology, vol. 2, pp. 111-131, 2009.

R. Roy and O. Shanker, “Calculation of intercavity coupling coefficient for side coupled standing-wave linear acceleratorâ€, IEEE Trans. Microw, Theory Techn., vol. 41, pp. 1233–1235, 1993.

J.S. Aubin, S. Steciw and B.G. Fallone, “The design of a simulated in-line side-coupled 6 MV linear accelerator waveguideâ€, Medical Physics, vol. 37, pp. 466-76, 2010.

COMSOL Multiphysics® v. 5.6. www.comsol.com. COMSOL AB, Stockholm, Sweden.

Downloads

Published

10-08-2021

How to Cite

Aleem, M. A., Khan, M. A., Khalid, R., & Mahmood, I. (2021). Radio Frequency Study of S-band Side Coupled Accelerating Structure. The Nucleus, 57(4), 129–134. Retrieved from http://www.thenucleuspak.org.pk/index.php/Nucleus/article/view/1077

Issue

Section

Articles