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Title: Effect of high current electron beam in a 30 MeV radio frequency linac for neutron-time-of-flight applications

A high power pulsed radio frequency electron linac is designed by BARC, India to accelerate 30 MeV, 10 A, 10 ns beam for neutron-time-of-flight applications. It will be used as a neutron generator and will produce ∼10{sup 12}–10{sup 13} n/s. It is essential to reduce the beam instability caused by space charge effect and the beam cavity interaction. In this paper, the wakefield losses in the accelerating section due to bunch of RMS (Root mean square) length 2 mm (at the gun exit) is analysed. Loss and kick factors are numerically calculated using CST wakefield solver. Both the longitudinal and transverse wake potentials are incorporated in beam dynamics code ELEGANT to find the transverse emittance growth of the beam propagating through the linac. Beam loading effect is examined by means of numerical computation carried out in ASTRA code. Beam break up start current has been estimated at the end of the linac which arises due to deflecting modes excited by the high current beam. At the end, transverse beam dynamics of such high current beam has been analysed.
Authors:
; ;  [1] ;  [1] ;  [2]
  1. Accelerator and Pulsed Power Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 (India)
  2. (India)
Publication Date:
OSTI Identifier:
22493844
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 23; Journal Issue: 1; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BARC; BEAM CURRENTS; BEAM DYNAMICS; BEAM EMITTANCE; ELECTRON BEAMS; INSTABILITY; INTERACTIONS; MEV RANGE; NEUTRON GENERATORS; NEUTRONS; PULSES; RADIOWAVE RADIATION; RF SYSTEMS; SPACE CHARGE; TIME-OF-FLIGHT METHOD; WAKEFIELD ACCELERATORS