CHEER, Canadian high energy electron ring

A large group of Canadian physicists has been studying the feasibility of building an electron storage ring (CHEER) tangent to a proton accelerator to study electron–quark collisions at extremely high energies. This article provides an overview of the physics, machine, and detector developments of the CHEER project along with a brief summary of the status of the project.

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Preliminary Hardware Concepts for a High-Energy Electron-Ring Accelerator

IEEE Transactions on Nuclear Science ◽

10.1109/tns.1971.4326094 ◽

1971 ◽

Vol 18 (3) ◽

pp. 484-487 ◽

Cited By ~ 3

Author(s):

A. Faltens ◽

E. Hartwig ◽

D. Keefe ◽

W. Salsig

Keyword(s):

High Energy ◽

Energy Electron ◽

High Energy Electron ◽

Electron Ring ◽

Electron Ring Accelerator ◽

Ring Accelerator

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Kinematic Approximations in TED and RHEED Analysis of Reconstructed Surfaces

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100135587 ◽

1990 ◽

Vol 48 (2) ◽

pp. 396-397

Author(s):

L. -M. Peng ◽

M. J. Whelan

Keyword(s):

Electron Diffraction ◽

Kinematic Analysis ◽

Incident Beam ◽

High Energy ◽

Energy Electron ◽

Great Success ◽

High Energy Electron ◽

Kinematic Approximation ◽

Reconstructed Surfaces

In recent years there has been a trend in the structure determination of reconstructed surfaces to use high energy electron diffraction techniques, and to employ a kinematic approximation in analyzing the intensities of surface superlattice reflections. Experimentally this is motivated by the great success of the determination of the dimer adatom stacking fault (DAS) structure of the Si(111) 7 × 7 reconstructed surface.While in the case of transmission electron diffraction (TED) the validity of the kinematic approximation has been examined by using multislice calculations for Si and certain incident beam directions, far less has been done in the reflection high energy electron diffraction (RHEED) case. In this paper we aim to provide a thorough Bloch wave analysis of the various diffraction processes involved, and to set criteria on the validity for the kinematic analysis of the intensities of the surface superlattice reflections.The validity of the kinematic analysis, being common to both the TED and RHEED case, relies primarily on two underlying observations, namely (l)the surface superlattice scattering in the selvedge is kinematically dominating, and (2)the superlattice diffracted beams are uncoupled from the fundamental diffracted beams within the bulk.

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