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  • The Electronic Aladdin Newsletter

    No.4, April 1996

    1) New Beamline Approved

    SRC has received word that the NIM/undulator beamline, proposed by Juan Carlos Campuzano, will be funded by the NSF. The project is a joint effort involving Juan Carlos Campuzano (UI-Chicago), Tai Chiang (UI-Urbana/Champaign), Rong Liu (Michigan State) and SRC. It will utilize an electromagnetic undulator being built by SRC and a 4 meter normal incidence monochromator. The beamline will provide SRC users with monochromatic radiation in the range between 6 eV and 35 eV. The resolving power will be 30,000 with a flux of in excess of 10**11 photons/sec.

    The high brilliance of the undulator will provide light for the next generation of angle resolved photoemission experiments. These experiments will push the resolution of the highly successful work on high temperature superconductors into the meV regime.

    2)New Accounting System Implemented

    With the start of SRC's new funding period (April 1), the accounting office has implemented the last major component of the new integrated accounting system. The WBS or Work Breakdown Structure will provide the capability to better record and track expenditures and allow identifiers and control units to be built into the project numbering system. Through a series of project and task numbers, the SRC technical staff as well as the accounting office, will be able to more accurately identify budgets, commitments and expenditures. This system provides new tools to assist the accounting office in keeping SRC fiscally responsible.

    3)Acknowledgement Alert

    The NSF requires that articles resulting from work performed at SRC include the statement "This work is based upon research conducted at the Synchrotron Radiation Center, Univ. of Wisconsin-Madison, which is supported by the NSF under Award No. DMR-95-31009."

    4)OMM Lives Up To Its Full Potential

    Few SRC users are aware of the availability of an undulator beamline on Aladdin which covers the photon energy range from 40 to 150 eV. The Old Maximum Monochromator (OMM) was recently upgraded by Tim Kubala with a new scan drive and entrance slit, and experiments conducted by Mark Bissen and Marion Roettger have shown that the monochromator resolution at 45 eV is less than 70 meV.

    Three user groups have already taken data using the upgraded OMM beamline: Art Nelson from NREL, Jian Ma from Max Lagally's group at UW-Madison, and Ron Cavell from the University of Alberta. Art Nelson and Jian Ma utilized the SRC's Cylindrical Mirror Analyzer (CMA)-chamber for their experiments. Jian conducted surface studies on specially treated GaN samples while Art's research dealt with semiconductor interface studies. Ron Cavell, along with doctorate student Astrid Jurgensen, used the Canadian "McPherson" electron spectrometer to record high resolution spectra of N2 and rare-gases.

    All the users found that the OMM beamline delivers significantly more flux at a higher resolution than any comparable beamline at SRC. More details and spectra are posted on the web at: Aladdin webPress.

    5)X-ray Eye In The Sky

    The SRC has recently played an important role in the development of a component for NASA's Advanced X-ray Astrophysics Facility (AXAF), a space-based x-ray telescope. During March, astronomers from Penn State University, led by Dr. Leisa Townsley, used the multi-layer beamline (port 051) to calibrate a set of x-ray filters. These filters are designed to transmit x-rays but block out both optical and ultra-violet light from the AXAF CCD Imaging Spectrometer (ACIS), the satellite's premier instrument for soft x-ray (spatial and spectral) mapping of the universe.

    The CCD arrays behind these filters are designed to image x-rays in the range from 200 eV to 10 keV. In order to calibrate the filters, the researchers measured each filter at several energies ranging from 200 eV to 2000 eV to characterize the transmission at fine spatial resolution. Calibrating the filter response will improve images that will be taken in space. Using the multi-layer beamline, the astronomers created transmission

    The AXAF is the third of NASA's Great Observatories, preceded by the Hubble Space Telescope and Compton Gamma Ray Observatory, which are designed to map the entire electromagnetic spectrum that cannot be observed from the ground. Together these three observatories cover the optical, gamma and x-ray ranges. The launching of a fourth satellite, the Space Infra Red Telescope Facility (SIRTF), around the year 2000 will provide a window to the infra red sky.