Rajesh Kumar of Bhabha Atomic Research Center

Low Energy High Intensity Proton Accelerator (LEHIPA) is presently under development at BARC. This 20 MeV ,30 mA proton current accelerator will require 3MW, CW RF Power at 352.2 MHz. This accelerator will need several high power RF components working in vacuum and high EM fields. One of the most crucial component is high power RF coupler which couples power to the accelerating RF cavities. These couplers can be iris type waveguide couplers or coaxial loop couplers. Several designs for both of these coupler types has been studied and analyzed. Presently ridge loaded iris type waveguide couplers are being fabricated for 250 kW, 352.2 MHz CW rating. Parallely, 50 kW, 350 MHz loop type Coaxial couplers are also being developed. The waveguide couplers are generally tuned by post fabrication machining on iris. Recently, author has proposed a novel scheme based upon iris rotation which will avoid any machining operations for tuning. Also, High power RF couplers has been known to suffer from secondary electron resonant emission called multi-pacting. These multipacting currents can lead to excessive localized heating, power reflection and absorption. EM Simulations and measurement setups are required to accurately predict and avoid multipacting. This talk will discuss the present status of the novel RF coupler development and multipacting analysis at LEHIPA, BARC. The possibilities of collaboration with IIT Kanpur will also be explored.

Biography: Rajesh Kumar obtained his BTech. in Electrical Engineering from National Institute of Technology (NIT) Hamirpur- HP,
and joined Nuclear Physics Division (NPD) of Bhabha Atomic Research center (BARC)
as Scientific Officer in 1995. He obtained his Masters in Microwave Engg. & Photonics from IIT Kanpur
during 2003- 2005. Since June 2005, he has been working on design and development of High power RF couplers for
LEHIPA project at BARC. He is also pursuing PhD studies on high power RF component development from
Homi Bhabha National Institute (HBNI)-BARC in collaboration with IIT Bombay. His areas of interest
are RF/Microwave component design, High power RF/Microwave systems and Computational Electromagnetics.
He has three publications in peer reviewed international journals and more than 15 publications in
international and national conferences/symposia.

Rajesh Kumar of Bhabha Atomic Research Center

Biography: