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Beam-based alignment technique for the SLC linac

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10 Author(s)
Adolphsen, C.E. ; California Univ., Santa Cruz, CA, USA ; Lavine, T.L. ; Atwood, W.B. ; Himel, T.M.
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It is pointed out that misalignments of quadrupole magnets and beam position monitors (BPMs) in the linac of the SLAC (Stanford Linear Accelerator Center) Linear Collider (SLC) cause the electron and positron beams to be steered off-center in the disk-loaded waveguide accelerator structures. Off-center beams produce wakefields which limit the SLC performance at high beam intensities by causing emittance growth. A general method is presented for simultaneously determining quadrupole magnet and BPM offsets using beam trajectory measurements. Results from the application of the method to the SLC linac are described. The alignment precision achieved is approximately 100 μm, which is significantly better than that obtained using optical surveying techniques

Published in:

Particle Accelerator Conference, 1989. Accelerator Science and Technology., Proceedings of the 1989 IEEE

Date of Conference:

20-23 Mar 1989

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