Recent Developments in the Design of the NLC Positron Source

Conference · Fri Nov 05 04:00:00 EST 1999

DOI:https://doi.org/10.1109/PAC.1999.792333· OSTI ID:792752

Kotseroglou, T ^[1]; Bharadwaj, V; Clendenin, J E; Ecklund, S; Frisch, J; Krejcik, P; Kukikov, A V; Liu, J; Maruyama, T; Millage, K K; Mulhollan, G; Nelson, W R; Schultz, D C; Sheppard, J C; Turner, J; Van Bibber, K; Flottmann, K; Namito, Y

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1. LLNL

Recent developments in the design of the Next Linear Collider (NLC) positron source based on updated beam parameters are described. The unpolarized NLC positron source [1,2] consists of a dedicated 6.2 GeV S-band electron accelerator, a high-Z positron production target, a capture system and an L-band positron linac. The 1998 failure of the SLC target, which is currently under investigation, may lead to a variation of the target design. Progress towards a polarized positron source is also presented. A moderately polarized positron beam colliding with a highly polarized electron beam results in an effective polarization large enough to explore new physics at NLC. One of the schemes towards a polarized positron source incorporates a polarized electron source, a 50 MeV electron accelerator, a thin target for positron production and a new capture system optimized for high-energy, small angular-divergence positrons. The yield for such a process, checked using the EGS4 code, is of the order of 10{sup -3}. The EGS4 code has being enhanced to include the effect of polarization in bremsstrahlung and pair-production process.

• Research Organization: Lawrence Livermore National Lab., CA (US)
• Sponsoring Organization: USDOE Office of Defense Programs (DP) (US)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 792752
• Report Number(s): UCRL-JC-136449
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCELERATORS
BREMSSTRAHLUNG
DESIGN
ELECTRON BEAMS
ELECTRON SOURCES
ELECTRONS
LINEAR COLLIDERS
PAIR PRODUCTION
PHYSICS
POLARIZATION
POSITRON BEAMS
POSITRON SOURCES
POSITRONS