Title :
Estimate of the impedance due to wall surface roughness
Author :
Bane, K.L.F. ; Ng, C.K. ; Chao, A.W.
Author_Institution :
Linear Accel. Center, Stanford Univ., CA, USA
Abstract :
In the Next Linear Collider (NLC) after being accelerated the beam is collimated to remove tail particles. Wakefields generated in the collimator section, however, can significantly degrade the beam emittance. The collimators are, therefore, carefully designed to balance and minimize the effects of the geometric and the resistive wall wakefields. Recent measurements of collimator wakefields in the Stanford Linear Collider (SLC) linac seem to confirm the geometric wakefield calculations but yield results for the resistive wall wakefield that are 3-4 times as large as expected. One possibility is that this discrepancy is due to the roughness of the collimator surface. In this report we estimate this effect
Keywords :
electron accelerators; linear colliders; particle beam dynamics; NLC; Next Linear Collider; SLC; Stanford Linear Collider; beam emittance; collimator section; collimator wakefields; geometric wakefield calculations; resistive wall wakefields; tail particles; wall surface roughness; Acceleration; Colliding beam accelerators; Colliding beam devices; Collimators; Degradation; Particle beams; Rough surfaces; Surface impedance; Surface roughness; Tail;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.750991
