Title :
Beam-based alignment technique for the SLC linac
Author :
Adolphsen, C.E. ; Lavine, T.L. ; Atwood, W.B. ; Himel, T.M. ; Lee, M.J. ; Mattison, T.S. ; Pitthan, R. ; Seeman, J.T. ; Williams, S.H. ; Trilling, G.H.
Author_Institution :
California Univ., Santa Cruz, CA, USA
Abstract :
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
Keywords :
beam handling techniques; electron accelerators; linear accelerators; particle beam diagnostics; SLAC Linear Collider; SLC linac; beam based alignment technique; beam position monitors; beam trajectory measurements; disk-loaded waveguide accelerator structures; electron beams; emittance growth; misalignments; positron beams; quadrupole magnets; Accelerator magnets; Colliding beam accelerators; Colliding beam devices; Electron accelerators; Electron beams; Linear accelerators; Linear particle accelerator; Optical waveguides; Particle beams; Positrons;
Conference_Titel :
Particle Accelerator Conference, 1989. Accelerator Science and Technology., Proceedings of the 1989 IEEE
Conference_Location :
Chicago, IL
DOI :
10.1109/PAC.1989.73320
