Channeling at Fermilab Updated October 25, 2007 D. Carrigan carrigan@fnal.gov (subject line must be sensible)

Channeling Formulary

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Secondary beams	Bent crystal channeling was used for a septum in the Fermilab Neutrino East area at 800 GeV. It has since been applied to secondary beams at Serpukhov and CERN.	Deflection of an 800-GeV Particle Beam Using Channeling. S. Baker, et al., Fermilab-pub-86/20. Published in Nucl. Instr. Meth. A248 301 (1986).
Extraction	Using these channeling ideas in E-853 we extracted a 900 GeV beam from the Fermilab Tevatron. This was the highest energy beam ever extracted from an accelerator.	Beam Extraction Studies at 900-GeV Using a Channeling Crystal, R. Carrigan, et al., Fermilab-pub-99-186-E. Phys.Rev.ST Accel.Beams 5:043501,2002
Collimation	A team at Fermilab led by Nikolai Mokhov is now studying this process as an advanced accelerator collimation scheme.	See earlier work at BNL by Ray Fliller and others. RHIC collimation abstract:
Exotic acceleration and channeling for high bunch charge	We have also used channeling radiation to study the possibility for exotic acceleration at the Fermilab International Linear Collider (ILC) A0 test facility.	Electron Channeling Radiation Experiments At Very High Electron Bunch Charges. R. Carrigan, J. Freudenberger, S. Fritzler, H. Genz, A. Richter, A. Ushakov, A. Zilges, J.P.F. Sellschop,. Phys.Rev.A68:062901,2003 Phys. Rev. A68:062901 (2003)
Spin precession	At a Fermilab Program Advisory Committee review of the E-660 channeling proposal, Lee Pondrom of the University of Wisconsin suggested using bent crystals to measure short-lived particle magnetic moments. (This idea was proposed independently by Baryshevsky of Belarus.) With a Leningrad team, we demonstrated that process with hyperons during E-761.	First Observation of Magnetic Moment Precession of Channeled Particles in Bent Crystals. D. Chen, …, R. Carrigan, et al., Phys. Rev. Lett. 69, 3286 (1992).