| Paper |
Title |
Page |
| MOPKF076 |
An Overview of the Cryomodule for the Cornell ERL Injector
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491 |
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- H. Padamsee, B.M. Barstow, V. Medjidzade, V.D. Shemelin, K.W. Smolenski
Cornell University, Ithaca, New York
- I. Bazarov, C.K. Sinclair
Cornell University, Department of Physics, Ithaca, New York
- S.A. Belomestnykh, R. Geng, M. Liepe, M. Tigner, V. Veshcherevich
Cornell University, Laboratory for Elementary-Particle Physics, Ithaca, New York
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The first stage of the Cornell ERL project will be a 100 MeV, 100 mA (CW) prototype machine to study the energy recovery concept with high current, low emittance beams. In the injector, a bunched 100 mA, 500 keV beam of a DC gun will be compressed in a normal-conducting copper buncher and subsequently accelerated by five superconducting 2-cell cavities to an energy of 5.5 MeV. We will present an overview of the injector status to include the status of the cryomodule design along with the status of the 2-cell HOM-free cavity, the twin-input coupler and the ferrite HOM dampers in related papers.
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| TUPKF056 |
Multipacting in Crossed RF Fields near Cavity Equator
|
1075 |
| |
- V.D. Shemelin
Cornell University, Ithaca, New York
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Electric and magnetic fields near the cavity equator are presented in a form of expansions up to the third power of coordinates. Comparisons with numerical calculations made with the SLANS code for the TESLA and other cavity cells, as well as with the analytical solution for a spherical cavity are done. These fields are used for solution of equations of motion. It appears that for description of motion, the only main terms of the expansion are essential, but the value of coefficients for the electric field components depend on details of magnetic field behavior on the boundary. Equations of motion are solved for electrons moving in crossed RF fields near the cavity equator. Based on the analysis of these equations, general features of this kind of multipacting are obtained. Results are compared with simulations and experimental data. The "experimental" formulas for multipacting zones are explained and their dependence on the cavity geometries is shown. Developed approach allows evaluation of multipacting in a cavity without simulations but after an analysis of fields in the equatorial region. The fields can be computed by any code used for cavity calculation.
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