Channeling   updated February 19, 2016  carrigan@fnal.gov (subject line must be sensible)

Channeling Formulary

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Channeling at Fermilab

History: Channeling work at Fermilab started in 1974 with the publication by Dick Carrigan of "Possibility of a Psi Particle Beam Using Production Channeling" - Fermilab-FN‑0270 (see Phys. Rev. Lett. 35, 206 (1975)). Originally the hope was that the Angstrom feature size could be used to measure very short-lived particle lifetimes. Soon the work shifted to exploring the practical problems with channeling at multi-hundred GeV (E-507). In the process, our collaborator, Edic Tsyganov then of Dubna, came up with the idea of bent crystal channeling. That led to a low energy demonstration at Dubna, use for extraction at Dubna and Serpukhov, development of a theory of bent crystal channeling by our collaborator, Jim Ellison of the University of New Mexico, and extensive exploration of that theory at Fermilab. The table on the right summarizes the work in six major areas.

Hot Channeling Topics

Crystal collimation
This is now extremely interesting because of LHC requirements and channeling fundamentals.

Volume reflection and capture
Relates to effects observed at PNPI, IHEP, CERN, RHIC and Fermilab that may have significant impact on channeling collimation.

Negative bending?

Collimation

A team at Fermilab led by Nikolai Mokhov, Dean Still, and Vladimir Shiltsev is now studying this process as an advanced accelerator collimation technique in T-980.  [FERMILAB-CONF-09-173-APC (2009)]

Extraction

Using channeling in E-853 a team led by Thornton Murphy and Gerry Jackson extracted a 900 GeV beam from the Fermilab Tevatron. This was the highest energy beam ever extracted from an accelerator. [Fermilab-pub-99-186-E. Phys.Rev.ST Accel.Beams 5:043501 (2002)]

Fundamental Channeling

Teams led by Walter Gibson, Chih Ree Sun, and Jim Forster investigated dechanneling, bent crystal channeling, modulated nuclear interaction rates, crystal properties, and other channeling effects in the Meson Lab at Fermilab in experiments E-507, E-660, and E753.[Nuclear Physics B203, 40 (1982)].

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. [Fermilab-pub-86/20 Nucl. Instr. Meth. A248 301 (1986)]

High bunch charge channeling and exotic acceleration

With Harald Genz and Achim Richter we have used channeling radiation to study the possibility for exotic acceleration at the Fermilab International Linear Collider (ILC) A0 test facility. [Phys. Rev. A68:062901 (2003)]

Spin precession

At a Fermilab Program Advisory Committee review of the E-660 channeling proposal, Lee Pondrum 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 led by Vladimir Samsonov, we demonstrated that process with hyperons during E-761.[ Phys. Rev. Lett. 69, 3286 (1992).]