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Browsing Conference papers by Author "Chung, M."

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    Beam-Induced Electron Loading Effects in High Pressure Cavities for a Muon Collider
    (Proceedings of IPAC’10, Kyoto, Japan, 2010) Chung, M.; Tollestrup, A.; Jansson, A.; Yonehara, K.; Insepov, Z.
    Ionization cooling is a critical building block for the realization of a muon collider. To suppress breakdown in the presence of the external magnetic field, an idea of using an RF cavity filled with high pressure hydrogen gas is being considered for the cooling channel design. One possible problem expected in the high pressure RF cavity is, however, the dissipation of significant RF power through the beam-induced electrons accumulated inside the cavity. To characterize this detrimental loading effect, we develop a simplified model that relates the electron density evolution and the observed pickup voltage signal in the cavity, with consideration of several key molecular processes such as the formation of the polyatomic molecules, recombination and attachment. This model is expected to be compared with the actual beam test of the cavity in the MuCool Test Area (MTA) of Fermilab.
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    Study of Electron Swarm in High Pressure Hydrogen Gas Filled RF Cavities
    (Fermilab, 2010) Yonehara, K.; Chung, M.; Popovic, M.; Moretti, A.; Wang, H.; Alsharo'a, M.; Insepov, Z.
    A high pressure hydrogen gas filled RF cavity has been proposed for use in the muon collection system for a muon collider. It allows for high electric field gradients in RF cavities located in strong magnetic fields, a condition frequently encountered in a muon cooling channel. In addition, an intense muon beam will generate an electron swarm via the ionization process in the cavity. A large amount of RF power will be consumed into the swarm. We show the results from our studies of the HV RF breakdown in a cavity without a beam and present some results on the resulting electron swarm dynamics. This is preliminary to actual beam tests which will take place late in 2010.