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Potential Duplicate Authors:

• R. A. Carrigan, 3 publications

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4 papers

title:	Beam extraction studies at 900 GeV using a channeling crystal
format:	unknown
year:	2002
26 authors:	R. Carrigan | Chen, D. | G. Jackson | Mokhov, N. | C. T. Murphy | Baker, S. I. | S. A. Bogacz | D. B. Cline | Ramachandran, S. | Rhoades, J. | J. B. Rosenzweig | Asseev, A. | Biryukov, R. A. | Taratin, A. | Ellison, J. A. | Khanzadeev, A. | Prokofieva, T. | Samsonov, V. | Solodov, G. | Newberger, B. | Tsyganov, E. | Shih, H. J. | Gabella, W. | Cox, B. | Golovatyuk, V. | McManus, A.
abstract:	Luminosity-driven channeling extraction has been observed for the first time in a 900 GeV study at the Fermilab Tevatron. This experiment, Fermilab E853, demonstrated that useful TeV level beams can be extracted from a superconducting accelerator during high luminosity collider operations without unduly affecting the background at the collider detectors. Multipass extraction was found to increase the efficiency of the process significantly. The beam extraction efficiency was about 25%. Studies of time dependent effects found that the turn-to-turn structure was governed mainly by accelerator beam dynamics. Based on the results of this experiment, it is feasible to construct a parasitic 5?10 MHz proton beam from the Tevatron collider.
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title:	Beam transport, acceleration and compression studies in the Fermilab high-brightness photoinjector
format:	conference procceeding
conference:	1998 Linear Accelerator Conference
year:	1998
20 authors:	Carneiro, J. P. | R. Carrigan | Champion, M. S. | A. Cianchi | E. R. Colby | P. L. Colestock | H. T. Edwards | Fuerst, J. D. | W. Hartung | Koepke, K. P. | Kuchnir, M. | Spentzouris, L. K. | Fitch, M. J. | Fry, A. R. | Melissinos, A. C. | Taylor, B. D. | P. Michelato | Sertore, D. | C. Pagani | J. B. Rosenzweig
abstract:	A photoinjector is being constructed in order to produce a pulse train of up to 800 electron bunches, each with 8 nC of charge and a 3.5 ps rms bunch length. The spacing between bunches within a train is 1 s and the train repetition rate is 1?10 Hz. The desired transverse emittance is <20 mm mrad. An rf photo-gun delivers a bunched 4?5 MeV beam which will be accelerated to 14?18 MeV by a 9- cell superconducting cavity and compressed magnetically. Measurements have been done on the beam delivered by a first prototype rf gun; installation of a new rf gun, the 9-cell cavity, and the bunch compressor is in progress.
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title:	First observation of luminosity-driven extraction using channeling with a bent crystal
format:	unknown
year:	1998
26 authors:	R. Carrigan | Chen, D. | G. Jackson | Mokhov, N. | C. T. Murphy | Baker, S. I. | S. A. Bogacz | D. B. Cline | Ramachandran, S. | Rhoades, J. | J. B. Rosenzweig | Asseev, A. | Biryukov, R. A. | Taratin, A. | Ellison, J. A. | Khanzadeev, A. | Prokofieva, T. | Samsonov, V. | Solodov, G. | Newberger, B. | Tsyganov, E. | Shih, H. J. | Gabella, W. | Cox, B. | Golovatyuk, V. | McManus, A.
abstract:	Luminosity-driven channeling extraction has been observed for the first time using a 900 GeV circulating proton beam at the superconducting Fermilab Tevatron. The extraction efficiency was found to be about 30%. A 150 kHz beam was obtained during luminosity-driven extraction with a tolerable background rate at the collider experiments. A 900 kHz beam was obtained when the background limits were doubled. This is the highest energy at which channeling has been observed.
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title:	First results from bent crystal extraction at the Fermilab Tevatron
format:	unknown
year:	1996
27 authors:	C. T. Murphy | R. Carrigan | Chen, D. | G. Jackson | Mokhov, N. | Shih, H. J. | Cox, B. | Golovatyuk, V. | McManus, A. | A. Bogacz | D. B. Cline | Ramachandran, S. | Rhoades, J. | J. B. Rosenzweig | Newberger, B. | Ellison, J. A. | Baker, S. | Sun, C. R. | Gabella, W. | Tsyganov, E. | Taratin, A. | Asseev, A. | Biryukov, V. | Khanzadeev, A. | Prokofieva, T. | Samsonov, V. | Solodov, G.
abstract:	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. Extensive simulation work has been carried out. Two accelerator operating modes have been developed for crystal studies, ''kick'' mode and diffusion mode. Results from the first successful extraction in kick mode are presented.
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