Longitudinal beam dynamics for heavy ion fusion using WARPrz

Conference · Sat Dec 25 04:00:00 EST 1993 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:5151741

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

---

1. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
2. Naval Research Laboratory, Washington, DC 20375 (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.

• DOE Contract Number: W-7405-ENG-48; AI05-92ER54177; AI05-83ER40112
• OSTI ID: 5151741
• Report Number(s): CONF-9302104--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Journal Volume: 297:1
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430200* -- Particle Accelerators-- Beam Dynamics
Field Calculations
& Ion Optics
ACCELERATORS
BEAM DYNAMICS
COMPUTER CODES
COMPUTERIZED SIMULATION
ELECTRIC FIELDS
ELECTRIC IMPEDANCE
HEAVY ION ACCELERATORS
HILACS
IMPEDANCE
LINEAR ACCELERATORS
SIMULATION
SPACE CHARGE
W CODES