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Dispersive Nature of the FEL Amplifiers in the Whistler Mode

  • Ram GopalEmail author
  • M. Sunder Rajan
  • Priti Sharma
  • Abhinav K. Gautam
Conference paper
  • 5 Downloads
Part of the Advances in Intelligent Systems and Computing book series (AISC, volume 1154)

Abstract

The analytical formalism for whistler-pumped FEL amplifiers in collective Raman regime is developed. Compton regime (CR) has also feasible for the low-current gain; however, in practical, it does not exist for reasonable growth rate due to require of extremely high magnetic fields density (i.e., 10–15 T) to operate up to 200–250 GHz frequencies; hence, Raman regime plays an important role with the finite space charged mode only. The dispersive nature of the whistler-pumped FEL amplifiers is sensitive to frequency of electron cyclotron, plasma frequency, and magnetic fields of the amplifiers. The simultaneously of the pumped frequency with strong magnetic fields and plasma frequency should be synchronized for electron cyclotron frequency, which can rapidly increases the wiggler wave number to the radiation of amplification in the slow-whistler mode for high frequencies from millimeter to the sub-millimeter ranges. It is also clear that the background plasma should be lesser than the beam density for the charge neutralization and guiding of the signal into waveguides; hence, the plasma density can also improve the stability of high frequencies. In Raman regime, the growth rate is larger while it decreases as increases the frequency of operations and vice versa. The tapering of an axial field also plays a typical role to raise the efficiency as well as reduction in the length of interaction with axis.

Keywords

FEL amplifiers Axial field Wiggler field and whistler 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  • Ram Gopal
    • 1
    Email author
  • M. Sunder Rajan
    • 2
  • Priti Sharma
    • 3
  • Abhinav K. Gautam
    • 4
  1. 1.Department of Electronics EngineeringCRMT, Indian Institute of Technology (Banaras Hindu University)VaranasiIndia
  2. 2.Faculty of Electrical and Computer EngineeringInstitute of Technology, Arba Minch UniversityArba MinchEthiopia
  3. 3.Department of Electronics and Communication EngineeringUNSIET, Purvanchal UniversityJaunpurIndia
  4. 4.Department of Electrical EngineeringKamla Nehru Institute of TechnologySultanpurIndia

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