Design of Radio Frequency Cavities for a J-BAND Multibeam Klystron

Abstract

This article presents the computer-aided design of the intermediate and input/output cavities of a multi-beam klystron (MBK) working in the J-band frequency range. A coaxial type cavity has been proposed to meet the specified design parameters. The state of the art electromagnetic simulation tool Computer Simulation Technology microwave studio has been used for the design and optimization of the cavity. Different cavity parameters such as the quality factor, shunt impedance, etc. have been estimated with the help of the simulation tool. For the input/output cavities, the issue of symmetric coupling has been studied and a rectangular-shaped central conductor has been proposed to achieve the desired coupling.

Keywords:

• Cavity resonator
• Coaxial cavity
• Multi-beam klystron
• Radio frequency (RF) cavity
• RF cavity with coupler

Additional information

Notes on contributors

Santigopal Maity

Santigopal Maity is working as assistant professor in the Greater Kolkata College of Engineering and Management, Baruipur, 24-Pgs, West Bengal. He has obtained his B. Tech in electronics and communication engineering from Mallabhum Institute of Technology, Bishnupur, Bankura, West Bengal, under West Bengal University of Technology, Kolkata. He had qualified the all India based Graduate Aptitude Test in Engineering (GATE) examination in 2009. Mr. Maity has received his M. Tech in Electronics & Communication Engineering (Microwaves) from The University of Burdwan, Burdwan, West Bengal, India in 2011. During the M. Tech final year he has carried out the project work on multiple beam klystrons in the Central Electronics Engineering Research Institute, Pilani, Rajasthan.

E-mail: [email protected]

Ayan Kumar Bandyopadhyay

Ayan Kumar Bandyopadhyay is working as a scientist in the Central Electronics Engineering Research Institute, Pilani, India. He has done M.Sc. (Physics) and M.Tech. (microwaves) from Burdwan University, Burdwan West Bengal. He has obtained his Ph.D. from Otto-von-Guericke University, Germany with distinction (Summa-cum-laude) and worked as a post doctoral fellow in the European Synchrotron Radiation Facility (ESRF), France. During his post doctoral research, he has contributed in designing the higher order mode free radio frequency accelerating cavities of the ESRF. His current research interests include design and development of microwave components, systems and high power microwave tubes.

Dr. Bandyopadhyay was a visiting fellow at the department of electrical engineering, Perugia, Italy and at the Deutsche Electronen Synchrotron (DESY), Hamburg, Germany. He is a life member of Indian Vacuum Society and has authored about twenty papers in international and national journals and conference proceedings.

E-mail: [email protected]

Lalit Mohan Joshi

Lalit Mohan Joshi is Chief Scientist at Central Electronics Engineering Research Institute, Pilani. He did his M. Sc. in Physics from Kumaon University, Nainital and Ph.D. in Electronics Engineering from Institute of Technology, BHU, Varanasi. He has worked in projects on development of M-carcinotrons, Crossed field amplifiers and Coupled cavity TWTs. Currently he is heading the Klystron development group at CEERI and is chief investigator of three strategically important projects funded by Bhabha Atomic Research Centre (BARC), Mumbai and Defense Research Development Organisation (DRDO) Delhi.

Dr. Joshi has visited Lancaster University (UK), FZK, Karlsruhe and DESY Hamburg (Germany), Stanford University (USA) and Sweden as visiting Scientist where he worked in R&D related to CCTWT, Gyrotron and Klystrons. He is life fellow of IETE, Indian Vacuum Society, IFTA and Indian Physics Association. He has about fifty papers published in national and international journals and conference proceedings to his credit.

E-mail: [email protected]