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MOPBTH005 |
A FFAG-ERL at Cornell, a BNL/Cornell Collaboration |
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- G.H. Hoffstaetter, I.V. Bazarov, J. Dobbins, B.M. Dunham, C.E. Mayes, J.R. Patterson, D. Sagan
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
- I. Ben-Zvi, J.S. Berg, M. Blaskiewicz, S.J. Brooks, K.A. Brown, W. Fischer, Y. Hao, W. Meng, F. Méot, M.G. Minty, S. Peggs, V. Ptitsyn, T. Roser, P. Thieberger, D. Trbojevic, N. Tsoupas
BNL, Upton, Long Island, New York, USA
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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, a high-current CW cryomodule, a high-power beam stop, and several diagnostics tools for high-current and high-brightness beams. All these are now available to equip a one-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 22 times around the RHIC tunnel. The number of transport lines is minimized by using two non-scaling FFAG arcs. A collaboration between BNL and Cornell has been formed to investigate the new NS-FFAG optics of this design, built with permanent magnets, and to commission the unprecedented multi-turn ERL operation. This collaboration plans to install a NS-FFAG return loop and the associated optics-matching sections at Cornell’s one-cryomodule ERL. This FFAG-ERL will be installed in several stages, each of which investigates crutial parts of this new design.
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THIALH2070 |
A Fast Rotating Wire Scanner for Use in High Intensity Accelerators |
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- T.P. Moore, N.I. Agladze, A.C. Bartnik, I.V. Bazarov, J. Dobbins, B.M. Dunham, S.J. Full, Y. Li, X. Liu, J.J. Savino, K.W. Smolenski
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
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Funding: This work was supported by the financial assistance from the National Science Foundation (Grant No. DMR-0807731).
We have developed a cost-effective, fast rotating wire scanner for use in accelerators where high beam currents would otherwise melt even carbon wires. This new design uses a simple planetary gear setup to rotate a tungsten or carbon wire, fixed at one end, through the beam at speeds in excess of 20 m/s. We present results from bench tests, as well as transverse beam profile measurements taken at Cornell’s high-brightness ERL photoinjector, for beam currents up to 35 mA.
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Slides THIALH2070 [1.429 MB]
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THIALH2071 |
Detection and Clearing of Trapped Ions in the High Current Cornell Photoinjector |
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- S.J. Full, A.C. Bartnik, I.V. Bazarov, J. Dobbins, B.M. Dunham, G.H. Hoffstaetter
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
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Funding: DOE Nuclear Physics award DE-SC0012493
We evaluate the effectiveness of three ion-clearing strategies in the Cornell high intensity photoinjector: DC clearing electrodes, bunch gaps, and beam shaking. We present data from recent experiments where we directly measured the residual trapped ion density while employing these clearing methods. Several theoretical models have been developed to estimate the ion creation and clearing rates. The data is well explained by two independent simulation codes that track the motion of ions trapped in the electric field generated by the beam.
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Slides THIALH2071 [4.104 MB]
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