CERN Accelerating science

Article
Report number	arXiv:1002.0359 ; FERMILAB-CONF-09-618-AD
Title	Negative Particle Planar and Axial Channeling and Channeling Collimation
Author(s)	Carrigan, Richard A., Jr. (Fermilab)
Publication	2010
Imprint	03 Feb 2010
Number of pages	15
Note	Comments: 15 pages, 1 figure, docx file
In:	Int. J. Mod. Phys. AS 25S1 (2010) pp.55-69
In:	51st Workshop of the INFN ELOISATRON Project: Charged and Neutral Particles Channeling Phenomena, Erice, Italy, 25 Oct – 1 Nov 2008, pp.129-143
DOI	10.1142/S0217751X10049918 10.1142/9789814307017_0012
Subject category	Accelerators and Storage Rings
Accelerator/Facility, Experiment	CERN SPS CERN SPS CERN SPS
Test beam	H4 ; H8
Abstract	While information exists on high energy negative particle channeling there has been little study of the challenges of negative particle bending and channeling collimation. Partly this is because negative dechanneling lengths are relatively much shorter. Electrons are not particularly useful for investigating negative particle channeling effects because their material interactions are dominated by channeling radiation. Another important factor is that the current central challenge in channeling collimation is the proton-proton Large Hadron Collider (LHC) where both beams are positive. On the other hand in the future the collimation question might reemerge for electron-positron or muon colliders. Dechanneling lengths increase at higher energies so that part of the negative particle experimental challenge diminishes. In the article different approaches to determining negative dechanneling lengths are reviewed. The more complicated case for axial channeling is also discussed. Muon channeling as a tool to investigate dechanneling is also discussed. While it is now possible to study muon channeling it will probably not illuminate the study of negative dechanneling.

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