Obtaining Beamtime

    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.

    Beamline Utilities

    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.

    Hutch Layout

    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 (1.5% bandpass, 5.5-11 keV energy range), a P6 shutter fixed in monochromatic mode, and a flat Pd-coated mirror deflecting upwards (rarely used).

    The 7-BM-B experimental station houses two precision motorized tables for alignment and positioning of experimental equipment. It houses a 300 mm long KB mirror system for focusing and harmonic rejection.

    A schematic of the hutch layout is given here.

    Recent technical description: 7BM beamline description by A. Kastengren et al., in ILASS 2010

    Electrical Power

    • 115 VAC single-phase, 20 A service using standard US plugs. The hutch contains two sets of outlets: dirty power (brown outlets) for most equipment, and clean power (orange outlets) for equipment sensitive to electrical noise.
    • 208 VAC single-phase, 20 A for one outlet near the downstream end of 7-BM-B.
    • 208 VAC 3-phase, 20 A using Hubbell twist-lock plugs on several outlets inside 7-BM-B.
    • 208 VAC 3-phase, 30 A using a Hubbell twist-lock plug on the roof of 7-BM-B.
    • 480 VAC 3-phase, 60 A for one outlet on the roof of 7-BM-B.

    Water

    • Chilled water is provided by the APS central chilled water system. Typical temperatures and flowrates at 2 L/min at 6° C. Note that this water supply contains particulates and contaminants, and as such should not be used when cleanliness is essential. Hydraulic quick-connect couplers (Parker BH4-60 and BH4-61) are used to connect to the chilled water system, with the female end of the coupler connected to the hutch supply pipes.
    • Deionized water can be obtained on-site. Please consult with beamline staff if DI water will be needed for an experiment.
    • Tap water and drains are available in the beamline laboratory in Building 432, adjacent to the experiment hall. Note that no chemical waste may be disposed of in the sinks.

    Compressed Gases

    • Compressed air is available through a manifold with manual regulators. The maximum delivery pressure is 90 psig.
    • High-pressure gas cylinders can be placed outside the 7-BM-B hutch. One high-pressure feedthrough into the hutch is available.

    Exhaust

    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, and restriction on the flow significantly reduces the system capacity. This system is typically to remove nuisance fuel vapors from the hutch. It should not be relied upon to vent toxic or corrosive gases from the hutch.


    Alan Kastengren, XSD