Damped and detuned accelerator structures

Conference · Sat Sep 01 04:00:00 EDT 1990

OSTI ID:6450562

Deruyter, H; Farkas, Z D; Hoag, H A; Ko, K; Kroll, N; Loew, G A; Miller, R; Palmer, R B; Paterson, J M; Thompson, K A; Wang, J W; Wilson, P B

This paper reports continuing work on accelerator structures for future TeV linear colliders. These structures, in addition to having to operate at high gradients, must minimize the effects of wakefield modes which are induced by e{sup {plus minus}} bunch trains. Two types of modified disk-loaded waveguides are under investigation: damped structures in which the wakefield power is coupled out to lossy regions through radial slots in the disks and/or azimuthal rectangular waveguides, whereby the external Q of the undesirable HEM{sub 11} mode is lowered to values below 20, and detuned structures in which the frequencies of these modes are modified from one end to the other of each section by {approximately}10%, thereby scrambling their effects on the beam. Beam dynamics calculations indicate that these two approaches are roughly equivalent. MAFIA, ARGUS and URMEL codes have been used extensively in conjunction with low-power tests on S- and X-band models to identify mode patterns, dispersion curves and Q values, and to demonstrate damping or detuning of the HEM modes. Results of calculations and measurements on the various structures are presented and evaluated.

• Research Organization: Stanford Linear Accelerator Center, Menlo Park, CA (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC03-76SF00515
• OSTI ID: 6450562
• Report Number(s): SLAC-PUB-5322; CONF-9009123--36; ON: DE91001027
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430303* -- Particle Accelerators-- Experimental Facilities & Equipment
ACCELERATORS
BEAM DYNAMICS
DAMPING
DIPOLES
ELECTROMAGNETIC FIELDS
LANDAU DAMPING
LINEAR ACCELERATORS
LINEAR COLLIDERS
MECHANICAL STRUCTURES
MULTIPOLES
WAVE PROPAGATION
WAVEGUIDES