ICAP-2002 Abstracts and Posters

ICAP 2002 Abstracts and Posters

Modeling HOM Heating in the PEP-II IR with Omega3P

Abstract

The PEP-II Interaction Region (IR) experienced excessive wall heating in the presence of colliding beams which limited the machine from operating at higher currents. The IR is over 6 meters long from crotch to crotch with varying cross-sections along the beamline, and the heating is attributed to beam excited HOM's trapped between the crotches. Due to the large aspect ratio, complexity and size of the geometry, a code like Omega3P that uses unstructured grids and multi-processing is needed for obtaining the accuracy and resolution required. Working directly from a full-scale CAD model, we calculate the mode spectrum of the IR and find the power distribution by summing the contributions within the 2-6 GHz range, taking into account the actual beam paths when evaluating the interaction impedance. Results from modeling the previous IR configuration as well as the newly installed upgrade are compared.

C. Ng, N. Folwell, L. Ge, G. Golub, Y.Sun J. Tran, K. Ko

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