Physics – Accelerator Physics
Scientific paper
2002-09-10
Phys.Rev.ST Accel.Beams 6 (2003) 024401
Physics
Accelerator Physics
18 pages, 6 figures, 1 bibliography file
Scientific paper
10.1103/PhysRevSTAB.6.024401
We consider the impedance of a structure with rectangular, periodic corrugations on two opposing sides of a rectangular beam tube. Using the method of field matching, we find the modes in such a structure. We then limit ourselves to the the case of small corrugations, but where the depth of corrugation is not small compared to the period. For such a structure we generate analytical approximate solutions for the wave number $k$, group velocity $v_g$, and loss factor $\kappa$ for the lowest (the dominant) mode which, when compared with the results of the complete numerical solution, agreed well. We find: if $w\sim a$, where $w$ is the beam pipe width and $a$ is the beam pipe half-height, then one mode dominates the impedance, with $k\sim1/\sqrt{w\delta}$ ($\delta$ is the depth of corrugation), $(1-v_g/c)\sim\delta$, and $\kappa\sim1/(aw)$, which (when replacing $w$ by $a$) is the same scaling as was found for small corrugations in a {\it round} beam pipe. Our results disagree in an important way with a recent paper of Mostacci {\it et al.} [A. Mostacci {\it et al.}, Phys. Rev. ST-AB, {\bf 5}, 044401 (2002)], where, for the rectangular structure, the authors obtained a synchronous mode with the same frequency $k$, but with $\kappa\sim\delta$. Finally, we find that if $w$ is large compared to $a$ then many nearby modes contribute to the impedance, resulting in a wakefield that Landau damps.
Bane Karl L. F.
Stupakov Gennady
No associations
LandOfFree
Impedance of a Rectangular Beam Tube with Small Corrugations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Impedance of a Rectangular Beam Tube with Small Corrugations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Impedance of a Rectangular Beam Tube with Small Corrugations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-368954