Longitudinal beam dynamics for heavy ion fusion using WARPrz

Conference · Mon Feb 22 04:00:00 EST 1993

OSTI ID:10183065

Callahan, D A; Langdon, A B; Friedman, A ^[1]; Haber, I ^[2]

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1. Lawrence Livermore National Lab., CA (United States)
2. Naval Research Lab., Washington, DC (United States)

WARPrz is a 2.5 dimensional, cylindrically symmetric, electrostatic, particle-in-cell code. It is part of the WARP family of codes which has been developed to study heavy ion fusion driver issues. WARPrz is being used to study the longitudinal dynamics of heavy ion beams including a longitudinal instability that is driven by the impedance of the LINAC accelerating modules. This instability is of concern because it can enhance longitudinal momentum spread; chromatic abhoration in the lens system restricts the amount of momentum spread allowed in the beam in the final focusing system. The impedance of the modules is modeled by a continuum of resistors and capacitors in parallel in WARPrz. We discuss simulations of this instability including the effect of finite temperature and reflection of perturbations off the beam ends. We also discuss intermittency of axial confining fields (``ears`` fields) as a seed for this instability.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States); Department of Defense, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48; AI05-92ER54177; AI05-83ER40112
• OSTI ID: 10183065
• Report Number(s): UCRL-JC--112247; CONF-930269--20; ON: DE93019154
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430200
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700411
BEAM DYNAMICS
BEAM DYNAMICS, FIELD CALCULATIONS, AND ION OPTICS
HILACS
INERTIAL CONFINEMENT
INERTIAL CONFINEMENT DEVICES
INSTABILITY
W CODES