Optimization of Positron Capture in NLC
- SLAC
In the Next Linear Collider design, the positron capture system includes a positron production target, followed by a short solenoid with a strong magnetic field (flux concentrator), a 250 MeV linac with solenoidal focusing, a 1.73 GeV linac with quadrupole focusing and an energy compressor system before injection into the positron pre-damping ring. Two schemes for positron production have been studied: (1) a conventional approach with a 6.2 GeV electron beam interacting with a high-Z target and (2) polarized positron production using polarized photons generated in a helical undulator by a 150 GeV electron beam which then interact with a positron production target. The capture system has been optimized to insure high positron yield into the 6-dimensional acceptance of the pre-damping ring. As a result of these optimization studies, the positron yield in the conventional scheme has been increased from 1.0 to at least 1.5 and capture for the polarized positron scheme from 0.25 to 0.30 while maintaining 60% positron polarization.
- Research Organization:
- Stanford Linear Accelerator Center, Menlo Park, CA (US)
- Sponsoring Organization:
- USDOE Office of Science (US)
- DOE Contract Number:
- AC03-76SF00515;
- OSTI ID:
- 829785
- Report Number(s):
- SLAC-PUB-10653
- Country of Publication:
- United States
- Language:
- English
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