Transverse match of high peak-current beam into the LANSCE DTL using PARMILA
A new algorithm that uses a multiparticle PARMILA-based code to match high peak current H{sup +} beam ({approx}21 mA) into the Los Alamos Neutron Science Center (LANSCE) drift tube linac (DTL) has been developed. Two single cell rf bunchers in the low energy beam transport (LEBT) prepare the initially unbunched beam for DTL capture. The transverse distribution at the entrance to the DTL is set with four quadrupoles in the 1.26 m between the last transverse emittance measuring station and the DTL entrance. Previous matching algorithms used TRACE and TRACE 3-D to determine these quadrupole strengths. PARMILA simulation show this procedure produces non-zero mismatch and additional emittance growth through the DTL for high current beams. Because of strong space-charge forces and a rapidly forming longitudinal bunch, simple envelope calculations do not model the beam evolution in the LEBT well. A PARMILA model of this region was combined with ant iterative search routine to set the LEBT quadrupole strengths to achieve a better transverse match into the DTL. Simulations predict a significant reduction in transverse emittance at the exit of the DTL over the typical TRACE 3-D result.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 383009
- Report Number(s):
- LA-UR-96-2844; CONF-9608123-3; ON: DE96014623; TRN: 96:028331
- Resource Relation:
- Conference: 18. international linac conference, Geneva (Switzerland), 26-30 Aug 1996; Other Information: PBD: [1996]
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
99 MATHEMATICS
COMPUTERS
INFORMATION SCIENCE
MANAGEMENT
LAW
MISCELLANEOUS
HYDROGEN IONS 1 PLUS
ION BEAM INJECTION
LINEAR ACCELERATORS
DRIFT TUBES
P CODES
ALGORITHMS
NEUTRON SOURCES
RF SYSTEMS
BEAM BUNCHERS
BEAM BUNCHING
BEAM EMITTANCE
PHASE SPACE
BEAM DYNAMICS
SPACE CHARGE
TWO-DIMENSIONAL CALCULATIONS
MATHEMATICAL MODELS
THREE-DIMENSIONAL CALCULATIONS