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CBETA: The Cornell/BNL 4-Turn ERL with FFAG Return Arcs for eRHIC Prototyping

Georg Hoffstaetter, John Barley, Adam Bartnik, Ivan Bazarov, Ilan Ben-Zvi, J. Scott Berg, Stephen Brooks, John Dobbins, David Douglas, Bruce Dunham, Ralf Eichhorn, Richard Gallagher (+23 others)
2017

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Cornell University has prototyped technology essential for any high brightness electron ERL. This includes a DC gun and an SRF injector Linac with world-record current and normalized brightness in a bunch train, a high-current CW cryomodule, a high-power beam stop, and several diagnostics tools for high-current and high-brightness beams, e.g. slid measurements for 6-D phase-space densities, a fast wire scanner for beam profiles, and beam loos diagnostics. All these are now available to equip a
more » ... ne-cryomodule ERL, and laboratory space has been cleared out and is radiation shielded to install this ERL at Cornell. BNL has designed a multi-turn ERL for eRHIC, where beam is transported more than 20 times around the RHIC tunnel. The number of transport lines is minimized by using two non-scaling (NS) FFAG arcs. A collaboration between BNL and Cornell has been formed to investigate the new NS-FFAG optics and the multi-turn eRHIC ERL design by building a 4-turn, one-cryomodule ERL at Cornell. It has a NS-FFAG return loop built with permanent magnets and is meant to accelerate 40mA beam to 200MeV.
doi:10.18429/jacow-linac2016-tuop02 fatcat:4eobuu4rrzay5b3oeq55u5eizq
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Georg Hoffstaetter, John Barley, Adam Bartnik, Ivan Bazarov, Ilan Ben-Zvi, J. Scott Berg, Stephen Brooks, John Dobbins, David Douglas, Bruce Dunham, Ralf Eichhorn, Richard Gallagher, Colwyn Gulliford, Yulin Li, Matthias Liepe, William Lou, George Mahler, Christopher Mayes, Francois Méot, Michiko Minty, J. Ritchie Patterson, Steve Peggs, Vadim Ptitsyn, Thomas Roser, Daniel Sabol, Eric Smith, Karl Smolenski, Dejan Trbojevic, Nicholaos Tsoupas, Joseph Tuozzolo, Holger Witte, Yamazaki, Yoshishige (Ed.), Facco, Alberto (Ed.), McCausey, Amy (Ed.), Schaa, Volker RW (Ed.). "CBETA: The Cornell/BNL 4-Turn ERL with FFAG Return Arcs for eRHIC Prototyping." (2017) USA