Acclerator R&D for a Linear Collider
The goal of this project was to perform simulations of beam transport in linear colliders, with an emphasis on emittance dilution, spin polarization transport, and development and testing of beam based tuning algorithms. Our simulations are based on an existing object-oriented particle-tracking library, Bmad. To facilitate the efficient development of simulations, an accelerator design and analysis program based on Bmad has been developed called Tao (Tool for Accelerator Optics). The three beam-based alignment algorithms, Dispersion Free Steering, Ballistic Alignment (BA), and the Kubo Method have been implemented in Tao. We have studied the effects of magnet misalignments, BPM resolution, beam jitter, stray fields, BPM and steering magnet failure and the effects of various cavity shape wakefields. A parametric study has been conducted in the presence of the above types of errors for all three alignment algorithms. We find that BPM resolution has only modest impact on the effectiveness of beam based alignment. The DFS correction algorithm was found to be very robust in situations where there were BPM and/or steering magnet failures. The wakefields in the main linac are very weak and cause negligible emittance growth. Spin tracking was extended to study all accelerator components between the damping ring and the interaction point, including RF cavities and the helical undulator. We find that there is no significant depolarization in the RTML, main linac or beam delivery system and that the polarization is relatively insensitive to misalignment. We have developed an effective spin rotator. During the final year of the grant we exploited the computing power of our new linux cluster, along with the modeling codes that we had developed, to investigate damping ring physics and design, specifically as it relates to the CESR Test Accelerator project.
- Research Organization:
- Cornell Univ., Ithaca, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- FG02-04ER41352
- OSTI ID:
- 941715
- Report Number(s):
- DOE/ER/41352-8; TRN: US1002177
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ACCELERATORS
ALGORITHMS
ALIGNMENT
BEAM TRANSPORT
CAVITIES
DAMPING
DEPOLARIZATION
DILUTION
KUBO FORMULA
LINEAR ACCELERATORS
LINEAR COLLIDERS
MAGNETS
OPTICS
PHYSICS
POLARIZATION
RESOLUTION
SPIN
TRANSPORT
TUNING
Linear accelerator
emittance dilution
beam based alignment
spin polarization
spin rotator
dispersion free steering
simulation
beam transport