Title :
Damped accelerator structures for future linear e± colliders
Author :
Deruyter, H. ; Hoag, H.A. ; Lisin, A.V. ; Loew, G.A. ; Palmer, R.B. ; Paterson, J.M. ; Rago, C.E. ; Wang, J.W.
Author_Institution :
Stanford Linear Accel. Center, Stanford Univ., CA, USA
Abstract :
Preliminary work on accelerator structures for future teraelectronvolt linear colliders which use trains of e± bunches to reach the required luminosity is described. These bunch trains, if not perfectly aligned with respect to the accelerator axis, induce transverse wakefield modes into the structure. Unless they are sufficiently damped, these modes cause cumulative beam deflections and emittance growth. The envisaged structures are disk-loaded waveguides in which the disks are slotted radially into quadrants. Wakefield energy is coupled via the slots and double-ridged waveguides into a lossy region which is external to the accelerator structure. The requirement is that the Q of the HEM11 mode be reduced to a value of less than 30. The work done so far includes MAFIA code computations and low-power RF measurements to study the fields
Keywords :
beam handling equipment; beam handling techniques; electron accelerators; linear accelerators; physics computing; HEM11 mode; MAFIA code; bunch trains; cumulative beam deflections; damped accelerator structures; disk-loaded waveguides; double-ridged waveguides; electron/positron colliders; emittance growth; lossy region; low-power RF measurements; quadrants; teraelectronvolt linear colliders; transverse wakefield modes; Acceleration; Colliding beam accelerators; Cutoff frequency; Damping; Electric breakdown; Iris; Linear accelerators; Power measurement; Radio frequency; Structural beams;
Conference_Titel :
Particle Accelerator Conference, 1989. Accelerator Science and Technology., Proceedings of the 1989 IEEE
Conference_Location :
Chicago, IL
DOI :
10.1109/PAC.1989.73050
