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  • The Electronic Aladdin Newsletter

    No.6 June 1996

    1)Magnetic Field Photoelectron Microscope Ready for SRC-Users.

    A photoemission microscope system is the newest piece of research equipment available for SRC Users. The microscope, one of the few commercially built magnetic imaging microscopes in the world, is maintained and scheduled for user experiments by SRC-Research. The microscope was made accessible to the SRC-user community by Prof. John H. Weaver, a long-time SRC user, whose research efforts shifted directions freeing up his Surface Science microESCA system stationed at SRC. The microscope is connected to SRC's 3m TGM beamline located at port # 012.

    If you would like to learn more about the microscope's capabilities or are interested in using it for a test experiment, please get in touch with Hartmut Hochst.

    2)IR-Spectromicroscopy Station Ready for User Tests !

    Efforts to extend the spectral range of SRC-maintained beam lines into the infrared (IR) region are close to completion. During the last year, Tim May; a member of SRC's-Optics group, tested several scenarios to extract the IR portion of the broad synchrotron radiation spectrum. Based on these results, an IR facility located at port #031 is now in its final stages of commissioning.

    The new IR station consists of a commercial Fourier transform infrared spectrometer (Nicolet Instruments Magna 550 FTIR) and a research microscope (Spectra-Tech IR Plan). It is planned that the present microscope ,which is on loan from Prof. James Taylor, UW-Madison, will be replaced with a permanent SRC owned instrument after evaluating performance and input from the first few test users.

    For further information regarding technical details or to arrange for short term evaluation experiments using the new IR facility, please get in contact with Tim May.

    3) Commissioning of SRC's PGM Beamline In Sight!

    Work around the construction zone of the new SRC variable polarization PGM-beamline located at port #071 reached another critical milestone. The grating chamber equipped with all internal components (besides the optical elements) underwent a successful first vacuum bake by reaching a pressure well into the 10E-11 torr range.

    The grating chamber will be vented soon to allow installation of an internally water cooled plane mirror and a plane grating. (Both of these optics rotate and feature in situ monitoring of angular rotation with laser interferometry.) This will be followed by a final alignment procedure and then a second bakeout. The second bakeout will be done with all of the interconnecting beamline hardware present.

    For further information and pictures, check the SRC homepage under the Webpress link.

    4) Improved Bending Magnet Tank Section In The Works

    Tom Nelson and Wayne Thatcher are working on the construction of a new design of a bending magnet vacuum tank section. The tank which is currently built in the SRC shop incorporates the latest design features such as water cooling, removable integrated pump elements and flanged port extensions. After testing in an off-line test BM, the new tank will be installed into bending magnet BM# 1 to accommodate a recently funded NIM undulator beamline.

    For pictures of the new tank, check the SRC homepage under Webpress link.

    5) Shorter Pulse Allows Higher Beam Current for Operation With Interim Magnetron Tube

    During the machine development week starting June 17, the Pulse Forming Network (PFN) of the magnetron modulator for the microtron was modified. The modulator pulse was shortened from 5.5 us to 4.5 us. The shorter pulse still provides more than enough time to accommodate the 1.4 us electron gun pulse that is injected into the microtron. While the beam current out of the microtron is unchanged, the power out of the magnetron tube is reduced, lengthening its lifetime and enhancing operational reliability. Another added benefit is more stable microtron operation, pushing the Aladdin injected beams to the 160 mA level, even though the microtron is using the secondary spare, low power magnetron tube.

    6) New Network Link between SRC and Madison

    The new T1 (1.5 Mbit/sec) network link between SRC and the UW Madison campus is now operational. This link replaces the T3 link that has been used for many years. The hardware used to connect the Ethernet to the T3 was designed and constructed by PSL and has served us well, but parts to maintain it are no longer readily available.

    SRC IP Numbers Changed

    A major side effect of the network change noted above is that all the IP numbers used at SRC have been changed. The symbolic addresses (e.g. src.wisc.edu) remain the same. If you have a system that has been configured to use the previous numbers, which start with 128.104, then it must be reconfigured with a new setup. For a new version of the setup sheet for temporary computers on beamlines or for a permanent assignment, contact John Stott

    Public PCs Upgraded

    The two PCs in the Aladdin vault have been upgraded from Intel 386DX33 to AMD 5x86-133 processors. The new motherboards also have improved I/O ports and disk controllers, and more cache and main memory. These systems have been quite heavily used for both Internet access and work such as word processing and data reduction. We hope that these improvements will make them even more useful. The printers which are associated with them can also be used directly by any user computer with a connection to the SRC Ethernet.

    CDROM Recorder Installed On SRC-Library PC

    The PC in the SRC library is now equipped with an HP CDROM recorder. This makes it possible to copy up to 600 Mbyte of files onto a write-once CDROM. The system can record multiple sessions on a single CDROM, although there is substantial wasted space for each session.. This system will be most useful for archiving data from systems which are connected to the Ethernet. The CDROMs can be read on any PC or Macintosh equipped with a standard CDROM drive.

    7) Swiss/Wisconsin User Group Receives Funding for Thin Film Growth Facility

    Ecole Polytechnique Federale Lausanne, Switzerland, recently announced approval of an oxide thin film growth chamber. The growth facility, a collaboration between EPFL (Prof. Giorgio Margaritondo) and the University of Wisconsin (Prof. Marshall Onellion), will use pulsed laser deposition to grow a variety of oxide films and transfer them under vacuum for photoabsorption and high-resolution angle-resolved photoemission studies. The growth facility will be portable, and will include a Nd-YAG laser, vacuum chamber for film growth, and reflection high energy electron diffraction (RHEED) to monitor film morphology during growth. Films grown will be measured at the SRC, with additional ex situ measurements performed at the two campuses. Initial efforts will concentrate on cuprate superconductors and on materials of interest for infrared detector applications.

    Construction of the chamber will begin in July with the first films expected to be grown sometime in October. The funding for this growth chamber is provided by the government of Switzerland.

    8) SRC Researcher Receives Doctorate

    Congratulations are in order for SRC researcher Awny Al Omari, who successfully defended his doctoral thesis during the month of June. As a student of Ruben Reininger, Awny’s research dealt with the electronic properties of fluids. Using the Aluminum Seya Namioka beamline (port 83), Awny employed field ionization as a new technique to determine the ionization potential of an impurity doped in a non-polar fluid. His studies also included the first report on density induced autoionization of valence states.

    Awny plans to remain here at SRC throughout the summer while he finishes his masters in computer science.