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CHESS East receives radiation from the positron beam in CESR.   Both F1 and F2 receive beam from the 24-pole East 1.2 T wiggler while the F3 station gets x-rays from a CESR high-field dipole magnet.  The F-cave area was completely rebuilt in 1999 to upgrade the shielding levels and the optics for F-line.  In addition, the F1/F2 area has been enclosed to provide a quieter and more comfortable working environment.

F1 is an experimental station in high demand, especially by the macromolecular structure community. Doubly focused and tunable, it delivers a tremendous x-ray flux onto small specimens. It was built contiguous to a biohazard level 3 (BL3) safety facility, so that certain classes of sensitive and potentially dangerous viruses can be safely handled.

The F2 station has been in high demand by the macromolecular community for use with the Multi-wavelength Anomalous Dispersion or MAD technique.  During the upgrade for F-line a new monochromator was built for the F2 station to better accommodate the needs of the users of this technique.

The F3 station has a sagittal Si(111) monochromator that provides horizontal focusing of nearly 5 milliradians of hard-bend magnet radiation. The station has been outfitted with a small Huber diffractometer and with the enlargement of the station during the 1999 upgrade can better accommodate a  wide range of experiments. Two high resolution analyzer crystal devices have been developed for the detector arm: one is a standard analyzing crystal mount with motorized Bragg angle, and the second has a special geometry for analyzing the polarization content of the diffracted beam.

The E-line is a new beam line that is presently being commissioned that is used strictly for accelerator diagnostics. The beam line makes use of the hard-bend radiation from a dipole between the D and F beam lines. There is no experimental station associated with this beam line which is located entirely in the accelerator shielding area. The beam from this dipole is apertured horizontally to two beams. The Northern portion of the beam is used to determine the vertical emittance of the positrons and the Southern section for determining the horizontal emittance of the positrons.

D-line has been in high demand from users of the Materials Science, Chemistry, Engineering, and Environmental Science communities for experiments requiring high flux, but at a relaxed energy bandwidth. Recent applications range from small-angle scattering and grazing-incidence scattering to fluorescence imaging and ultrafast radiography.

Last Update: 2004-11-22