Sector 7: Overview and History

Sector 7 consists of two APS beamlines:

7-ID: an insertion device beamline based on an APS Type-A Undulator
7-BM: a bend magnet beam line with mirror focussing optics (in construction)

Overview of 7-ID

7-ID comprises four large experimental enclosures designated A, B, C, and D.

Enclosure 7-ID-A is the first optics enclosure and houses a commissioning window, an x-ray filter unit, a pair of white beam slits, a liquid-nitrogen-cooled double crystal Si monochromator (modified BESSERC design) , and a P4 safety shutter. In addition, immediately upstream and downstream of the high-heat-load mono, is a pair of flat metal-coated mirrors. These are intended as a harmonic rejection filter to provide pink-beam capabilities in a downstream enclosures.

Enclosure 7-ID-B is a white-, or monochromatic-beam experimental enclosure housing a micromonochromator, and a precision motorized table for alignment and positioning of experimental equipment. The micromono is a unique instrument designed and built by a Howard-ORNL collaboration. It provides a small-aperture mono beam suitable for focussing with a pair of fixed-figure in-hutch K-B mirrors, producing a sub-micron focus size. The critical energy of these mirrors is set to 22 keV, enabling white or monochromatic Laue diffraction, detected by a slow-scan CCD. This station is used for diffraction measurements and x-ray microprobe work.

Just downstream of 7-ID-B is a mini-enclosure housing the P5 unit. This acts as a white beam stop and offset mono-beam shutter to pass monochromatic beam into downstream enclosures C and D. Continuing downstream, a mono-beam transport takes monochromatic beam into enclosures C and D. Enclosure C houses a large Newport-Microcontrole Kappa Diffractometer and two large optical tables to set up users' experiments. Contiguous to C, enclosure D is instrumented for ultrafast laser experiments using a diode-pumped Ti-Sapphire femtosecond pulsed laser. Synchronization is achieved in pump-probe geometry utilitizing the RF bunch clock signal brought from the APS control room on an optical fiber. A four-circle Huber takes care of positioning in ID-D for the laser/x-ray experiments, and a small optical table is also available for users' experiments.

Status of 7-ID

All three enclosures 7-ID-B, C, and D are operational and accepting General Users. The pink beam in 7ID-C and D is not available at the moment.

Overview of 7-BM

7-BM comprises two contiguous enclosures, 7-BM-A and B. 7-BM-A is the first optics enclosure designed to house a white beam slit, double-crystal monochromator, a P6 shutter, and toroidal focussing mirror. Enclosure B is an experimental station intended for diffraction and spectroscopy experiments. 7-BM-B will house a 6-circle diffractometer and a precision motorized table for alignment and positioning of experimental equipment.

Status of 7-BM

The two BM enclosures, A and B, are PSS and radiation shielding validated. The standard (Oxford Instruments) components for 7-BM are installed but not yet commissioned. The double crystal monochromator (a replica of the one built for the ID line) is procured and nearing completion. A toroidal mirror for the bend magnet line has been procurred by funds from the University of Michigan Life Science Initiative, and the mirror should be delivered by the end of August 2004.

History

Sector 7 was built and commissioned by MHATT-CAT, the University of Michigan, Howard University,
and ATT Bell Laboratories Collaborative Access Team. Operational support by the DoE BES was transitioned
from MHATT-CAT to the APS between 2002 and 2004.

In addition to the three initial institutions, there are several groups including scientists at Oak Ridge National Laboratory
and Hebrew University which contributed significantly to the success of Sector 7. Below are some useful links
to the Sector 7 partners.

Key MHATT-CAT and APS/Sector 7 Design and Safety documents (APS Network Access only)

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