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Lal, S.

Paper Title Page
TUPEC004 Tuning and RF Characterization of Plane Wave Transformer (PWT) Linac Structures 1713
 
  • S. Lal, K.K. Pant
    RRCAT, Indore (M.P.)
  • S. Krishnagopal
    BARC, Mumbai
  
 

Four and eight cell Plane Wave Transformer (PWT) linac structures have been developed as part of the injector development for the Compact Ultrafast Terahertz Free Electron Laser (CUTE-FEL) at RRCAT. In this paper, we discuss the tuning of resonant frequency and waveguide-cavity coupling coefficient for these structures, and compare results obtained from cold tests with those predicted by RF simulations. We also compare energy gain and RF properties of these structures, determined from transient and steady state behavior of the structure during recent high power tests, with those predicted by cold tests.

  
TUPEC005 Development and Commissioning of the CUTE-FEL Injector 1716
 
  • S. Lal, B. Biswas, S. Chouksey, S.K. Gupta, U. Kale, M. Khursheed, A. Kumar, V. Kumar, P. Nerpagar, K.K. Pant, A. Patel, V. Prasad, A.K. Sarkar
    RRCAT, Indore (M.P.)
  • S. Krishnagopal
    BARC, Mumbai
  
 

The injector system for the Compact Ultrafast Terahertz Free Electron Laser (CUTE-FEL) consists of a 1 ns, 90 kV pulsed thermionic electron gun, a 476 MHz sub-harmonic prebuncher, and a standing wave, S-band Plane Wave Transformer (PWT) linac capable of accelerating beam to 10 MeV. Beam from this injector will be transported to the entrance of the undulator through a beam transport line, with the required diagnostic elements, that has been designed, developed and commissioned. The control system and the low and high power microwave lines have also been commissioned. In this paper, we discuss salient features of the injector system and results from recent commissioning trials of the injector.

  
THPEA003 An Analytical Formulation for Prediction of Geometrical Dimensions of a Photocathode Gun for Desired RF Properties 3679
 
  • S. Lal, K.K. Pant
    RRCAT, Indore (M.P.)
  • S. Krishnagopal
    BARC, Mumbai
  
 

Tuning of a photocathode gun for desired RF properties of the pi mode, such as FB ~1, fpi = 2856 MHz, and beta ~1, requires precise tuning of the resonant frequency and beta of its independent cells. In this paper, we present a parametric and analytical formulation to predict geometrical dimensions of independent cells and the coupling slot on the full cell to obtain the desired pi mode RF parameters during operation, taking into account the effect of brazing and vacuum. We also compare results obtained from low power RF measurements on a photocathode gun with those predicted by the above formulation.