As a user facility, the use of the APS is free to outside users for work that will be published in the open literature. Cost recovery charges apply for work that will remain proprietary. Beamtime is awarded competitively based on submitted proposals for beamtime, which consider the scientific merit of each proposal, as well as its suitability at the requested beamline. Approximately three weeks of beamtime are available at 7-BM for each four-month APS cycle. For parties interested in performing measurements at 7-BM, please contact beamline staff to discuss your experiments. The APS User Office has written a guide for the process of requesting and obtaining beamtime. Proposals are typically due 3 months prior to the start of a beam cycle.
Note that while the use of APS is free, users must arrange for travel, lodging when on-site, and shipping. Lodging is available on-site at the Argonne Guest House.
The following is a reasonably complete listing of the beamline utilities for prospective users in planning their experiments. Please confirm any critical utility needs with beamline staff before planning your experiment.
7-BM comprises two contiguous enclosures, 7-BM-A and B. 7-BM-A is the first optics enclosure designed with a white beam slit, a double-multilayer monochromator (three stripes, each approximately 8 mm wide), and a P6 mode change shutter, which allows for operation in both white and multilayer monochromatic mode.The 7-BM-B experimental station houses two precision motorized tables for alignment and positioning of experimental equipment. It also houses a 300 mm long KB mirror system for focusing and harmonic rejection.
A schematic of the hutch layout is given here.
A somewhat out-of-date technical description of the beamline is given in: 7BM beamline description by A. Kastengren et al., in ILASS 2010
Sample Mounting and Translation
The main translation for experiments is provided by a set of servo controlled translation stages. For experiments other than tomography, samples up to 40-50 kg mass can be accommodated. Typical mounting uses standard optical table hole patterns (1/4"-20 UNC holes on 1" centers). For tomography measurements, samples must typically be a few kg at most. Please enquire with beamline staff regarding sample mounting.
The hutch is equipped with a high-capacity exhaust system. The maximum flowrate through the system (with no restriction on the flow) is 350 CFM. The static suction of the system is quite small; as such, any restriction on the flow significantly reduces the system capacity.