2 papers

title:	Extraction from TeV-Range Accelerators Using Bent Crystal Channeling
format:	unknown
year:	1994
45 authors:	R. A. Carrigan | Chen, D. | P. Colestock | Herrup, D. | Goderre, G. | G. Jackson | C. T. Murphy | Stefanski, R. | Baker, S. | Mokhov, N. | Parker, B. | Shih, H. J. | Soundranayagam, R. | Toohig, T. | Peggs, S. | Sun, C. R. | Boden, A. | D. B. Cline | Gabella, W. | Ramachandran, S. | Rhoades, J. | J. B. Rosenzweig | Arenton, M. | Conetti, S. | Cox, B. | Dukes, D. | Golovatyuk, V. | McManus, A. | Nelson, K. | Norem, B. | Newberger, B. | Ellison, J. A. | Erwin, A. | Rossmanith, R. | Kovalenko, A. | Taratin, A. | Malakhov, N. | Tsyganov, E. | Bavizhev, M. | Biryukov, V. | M. Maslov | Khanzadeev, A. | Prokofieva, T. | Samsonov, V. | Solodov, G.
abstract:	Plans and first results from Fermilab Experiment 853 are presented. E853 is an experiment to test the feasibility and efficiency of extracting a low-intensity beam from the halo of the Tevatron using channeling in a bent silicon crystal. The motivation of the experiment is to apply crystal extraction to trans-TeV accelerators like the LHC. Channeling developments related to crystal extraction and some early results from accelerator studies at the Tevatron are presented.
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title:	RF Voltage Modulation at Discrete Frequencies, for Application to Proton Extraction Using Crysal Channeling
format:	conference procceeding
conference:	1993 Particle Accelerator Conference
year:	1993
4 authors:	Gabella, W. | J. B. Rosenzweig | Kick, R. | Peggs, S.
abstract:	RF voltage modulation at a finite number of discrete frequencies is described in a Hamiltonian framework. The theory is applied to the problem of parasitic extraction of protons from a circulating beam in a high energy hadron collider, using a bent crystal as a thin ?septum? extraction element. Three modes of employing discrete resonances are discussed: a strong, single drive resonance which may be used to excite protons to hit, deep within the crystal; a single resonance ramped in such a manner that the island can carry trapped particles from low to high amplitudes; and overlapping resonances to create a chaotic band for separating the moving island and the large amplitude island. Simulations are used to confirm the expected dynamics, and finally a prototypical extraction scheme is described.
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