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  • Summer 2008 Aladdin Newsletter No. 44

    Synchrotron Radiation Center

    Posted 08-13-2008

    In this issue:

    1. Instrumentation Upgrades and Advancements
    2. Education and Outreach Activities Report
    3. SRC Users Meeting
    4. User Brownbag Talks
    5. History of SRC Article
    6. Awards
    7. SRC Shuttle Service

    1. Instrumentation Upgrades and Advancements

    IRENI (Infrared Environmental Imaging) Beamline: First Light and Commissioning

    IRENI, the new infrared beamline extracting 320 mrads of light from the SRC, opened to first light on July 11, 2008. Since then, several shifts per week have been dedicated to aligning the beamline and conditioning the front end so that the beamline can be opened to regular beams.

    Figure 1 (see link below) shows synchrotron light illuminating the array of 12 toroids (only 9 are visible here), which are the first mirrors that the light intercepts in the beamline. The picture shows a shadow of a water-cooled tube across the center of each mirror and rectangles of visible synchrotron light above and below the shadows.

    Figure 2 (see link below) shows an image of the infrared Focal Plane Array (a multi-element infrared detector), when it is illuminated with 12 individual beams. This will be slightly defocused to create a homogeneously illuminated area for upcoming experiments, including measuring kinetics of living cells under environmental control.

    Dr. Hirschmugl thanks the SRC staff (particularly the engineering and shop staff) for all of their hard work in helping to make this happen. In addition, the IRINI group and future users thank the Users for their patience through the alignment and conditioning phase of the beamline.

    Figure 1: http://www.src.wisc.edu/news/images/IRENI.08.13.08.fig_1_hr.jpg

    Figure 2: http://www.src.wisc.edu/news/images/IRENI.08.13.08.fig_2_hr.jpg

    Upgrade of Scienta User System

    SRC's second angle resolved User photoemission system that was built around a SES 2002 electron analyzer from Scienta is currently upgraded with a brand new state-of-the-art R4000 electron spectrometer. The replacement of the analyzer and the corresponding electronics will significantly enhance the performance of the system which is used by many SRC Users to study electronic correlation effects in high Tc superconductors and other novel materials.

    In addition to increasing the angular resolved range from ~12° to 30° Users will also benefit from a significantly increased data acquisition rate from 1 Mbit/s to 400 Mbit/s by utilizing a Fire Wire communication rather than the old fiber optic link. Improvements in the imaging properties of the multi-element electrostatic lens system and a newly designed slit carousel allows now studies with sub-millivolt energy resolution.

    To fully utilize the broad dynamic range and high imaging quality of the lens system we are also improving the magnetic field properties in the analyzer chamber. The mu-metal shield is currently sent out for hydrogen annealing which should reduce any residual magnetic fields that might have accumulated over the years of usage under various experimental conditions. In the upcoming three weeks the system will be reassembled and tested on the NIM undulator-beamline before it will be available to Users.

    SS VLS-PGM Update

    A new Varied-line-spacing Plane Grating Monochromator is now under construction at SRC. The beamline is located on Port 091 with its source being a 1 meter undulator in short-straight-section 9 of the Aladdin ring. The beamline will have an energy range from 11 to 270 eV and will have comparable flux and resolution to the existing PGM, thereby relieving some of the demand on that beamline. In addition, the new undulator is an APPLE device and will offer new capabilities for polarization experiments.

    Some beamline components are already on the floor. The grating chamber (manufactured by Bestec in Germany) arrived in late May. It is currently undergoing testing and initial alignment checks in preparation for the installation of the real optics early this fall. All optics are in-house for the beamline. Two cooled aperture chambers are also complete.

    The undulator is scheduled to arrive in September from manufacturer, ADC, and then undergo checks and magnetic field mapping. A space has been set aside in the SRC Prep Area to do this work and testing equipment is being set up in preparation.

    2. Education and Outreach Activities Report

    With spring and summer comes the busiest season of the year for the Education and Outreach Group (E&O). First, the spring Open House was again a big success with 223 visitors who toured through the facility. Those visitors who responded to a survey unanimously said that they would recommend the tour to a friend and overwhelmingly rated the day very highly. Many respondents stressed how exciting it was to learn about synchrotrons and the research done here.

    The two summer programs of note, PEOPLE (Pre-College Enrichment Opportunity Program for Leaning Excellence) and SRC-REU (Research Experiences for Undergraduates) have both concluded. This year marked the first time the facility welcomed eight undergraduates as part of the REU program, which teams the students up with a researcher mentor for a summer-long experience at SRC. The program concluded with a written manuscript of their work and a seminar presentation. The PEOPLE class, led by SRC E&O staff, Dan Wallace, worked to inspire high school students to learn about physics and particularly the science of light and synchrotron light. Both of these programs seeks to encourage and support students from previously underrepresented groups in the sciences.

    The E&O group extends its sincere thanks to each and every SRC staff and user who assisted in these efforts.

    3. SRC Users Meeting

    The next SRC Users Meeting is quickly approaching. The SRC Users Meeting will be held Friday and Saturday, September 26 and 27, 2008, all those interested in participating should go to the link below for information about the event and for registration.

    http://www.src.wisc.edu/meetings/UM2008/

    The deadline to submit abstracts, register for the conference, and submit materials for the Aladdin Lamp award is September 2, 2008.

    4. User Brownbag Talks

    SRC has started a series of informal User presentations. The brownbag talks normally occur during the second week of each quantum and are meant as a way for Users to discuss their work in an informal setting. Look for announcements about upcoming talks via email and posters around the facility.

    5. History of SRC Article

    Anyone interested in learning more about the history of particle accelerator science at UW Madison should look for an article in the May 2008 issue of Physics Today. The article, written by former User, Giorgio Margaritondo, traces the history back to 1968 in "an underground bunker inside a hill near Lake Kegonsa in southern Wisconsin." The article goes on to explain the evolution of Tantalus, the first light source dedicated to synchrotron light experiments. The article is particularly timely considering the current initiative by SRC to encourage a national commitment to a next generation light source—a free electron laser.

    Those with online access to Physics Today can view the article at:

    http://ptonline.aip.org/journals/doc/PHTOAD-ft/vol_61/iss_5/37_1.shtml

    6. Awards

    7. SRC Shuttle Service

    SRC has started a new shuttle service between the UW Madison Campus and the SRC. The shuttle is available for students and users affiliated with SRC. For details regarding the shuttle service policies and procedures and learn how to make a reservation, please see: http://www.src.wisc.edu/news/Stories/SRC_Shuttle_Announcement.pdf

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