Model of current enhancement at high pressure
A model is proposed to account for the phenomenon of net current enhancement at high pressures recently observed on the Experimental Test Accelerator. The proposed mechanism involves energetic secondary electrons (delta rays) which are pushed forward by the self-magnetic field of the electron beam. For high current beams, the forward delta ray current can build up to a significant fraction of the beam current. Analytic calculations of the steady-state solution as well as the rate of buildup of the delta ray current are presented in this paper. In addition, numerical results from a nonlocal Boltzmann code, NUTS, are presented. The analytic and numerical results have many features which are in qualitative agreement with the experiments, but quantitative discrepancies still exist.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5471131
- Report Number(s):
- UCID-19965; ON: DE84005059
- Country of Publication:
- United States
- Language:
- English
Similar Records
Nonlocal particle loss effects on the electron kinetics in a direct current helium diffusion-controlled positive column
Investigation of Microbunching Instabilities in Modern Recirculating Accelerators
Related Subjects
ELECTRON BEAMS
KILO AMP BEAM CURRENTS
PRESSURE DEPENDENCE
BOLTZMANN EQUATION
DELTA RAYS
MATHEMATICAL MODELS
RELATIVISTIC RANGE
SECONDARY EMISSION
THEORETICAL DATA
BEAM CURRENTS
BEAMS
CURRENTS
DATA
DIFFERENTIAL EQUATIONS
EMISSION
ENERGY RANGE
EQUATIONS
INFORMATION
LEPTON BEAMS
NUMERICAL DATA
PARTIAL DIFFERENTIAL EQUATIONS
PARTICLE BEAMS
RADIATIONS
430200* - Particle Accelerators- Beam Dynamics
Field Calculations
& Ion Optics