Newsletter
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CLS-News Vol. 1 No. 3 December 11, 2001
www.lightsource.ca University of Saskatchewan, Canada
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- Booster ring progress
- Notes from the UAC — Report on 4th Annual Users’ Meeting and Upcoming Election
- Brochure en Français
- Beamlines Update
- Report on the CMCF Beamline Design Team Meeting
- New CLS List-Serve
- Science Highlight: "Coherent X-ray Scattering: a probe for Magnetism in Thin Films"
1- Booster ring progress (Contact: les.dallin@lightsource.ca )
Since the beginning of November, Danfysik staff members have been on site, supervising the installation of the booster. Most of the girders, pre-assembled with magnets and vacuum components, are now installed awaiting final alignment. The RF cavities are in place and the assembly of the RF system has begun. Remaining components, including the last of the girders, the injection septum and miscellaneous items, are now being installed. Danfysik and CLS staff are presently finalizing the wiring and cooling specifications, and component testing will begin in January.
2- Notes from the UAC - Report on 4th Annual Users’ Meeting and Upcoming Election (Contact Kathleen Gough-- kmgough@ms.umanitoba.ca )
As many of you know from first-hand experience, the 4th Annual Users’ Meeting held at the University of Saskatchewan on Saturday, November 17, 2001, was a tremendous success. The attendance set a new record, with over 200 attendees. A full report on the meeting, with summaries of presentations as well as of all the scientific presentations at the workshop on insertion devices, held on November 16, 2001, is available online at www.lightsource.ca/uac/Nov2001report.pdf
The members of the UAC would like to express their thanks in particular to Sandra Ribeiro, of the CLS Users Office, for her hard work on the preparations and also to the "Ribeiro Irregulars", her team of CLS staff and University of Saskatchewan students, who energetically and ably handled many of the logistical tasks from the registration desk to poster board set-up during the weekend.This is the fourth electronic newsletter to be distributed to CLS users, and my last message as chair of the UAC. Stephen Urquhart (Chemistry, U. Sask.) takes over this role as of January 2002. It has been a pleasure to chair this committee of hard-working volunteers, whose energy and commitment has helped in many ways to further the successful for evolution of the CLS.The next important event is the election of 5 new members to the UAC, replacing the 4 who are ending their terms, and 1 earlier resignation. A list of nominees was created at the AUM. Election will occur through electronic voting; polls will remain open one week: from December 12, 2001 until 12 noon CST (GMT-6) on December 19, 2001. The UAC is YOUR committee — exercise your right to participate, be sure to vote!Users’ Advisory Committee (UAC)Chair: Kathy Gough, Chemistry, University of Manitoba
3- Brochure en Français (Contactez: Clsuo@lightsource.ca )
Le Bureau des Utilisateurs et L’Institut Québécois du Synchrotron, représente par le Dr Thomas Ellis (U. Montréal), ont le plaisir d’annoncer que la brochure CLS sera bientôt disponible en version française. Pour demander votre copie nous vous prions de contacter brochure@lightsource.ca
4- Beamlines Update (Contact: emil.hallin@cls.usask.ca )
Letters of intent for Nanotech and BioMedical Imaging beamlines are being developed into proposals for presentation to the FAC meeting in Feb 2002. Growing these new beamline teams, and building Canadian community interests requires preliminary contact lists to be rapidly expanded. The enthusiastic support of principle investigators is also necessary to facilitate letters of support, and contribute research abstracts. For more information, please contact the following proposal writing teams -- please also pass this note along to your colleagues who may be interested (web sites to be launched this week).
www.lightsource.ca/nano
Dr. David Klymyshyn, Prof. Elect. Eng. (klymyshyn@engr.usask.ca )
Andrew Kostiuk, Project Manager (kostiuk@sask.trlabs.ca )
www.lightsource.ca/bioimaging
Dr. Barry McLennan, A. Dean Research, Uof S College of Medicine (barry.mclennan@usask.ca )
Dr. Colleen Christensen, Project Manager (bmigroup@sdh.sk.ca )
5- Report on the CMCF Beamline Design Team Meeting (Contact: pawel.grochulski@lightsource.ca )
A report on the recent CMCF Beamline Design Team Meeting is available through ftp://transfer.lightsource.ca/XFG/CMCF/meetings/meeting_2001_Nov.htm
6- New CLS List-Serve (Contact: Sandra.Ribeiro@lightsource.ca )
We will soon be moving to an automated list system. You may leave the list at anytime by going to www.lightsource.ca/enews/
If you wish to recommend this service to a friend or colleague, please forward the URL above.
7- Science Highlight: "Coherent X-ray Scattering: a probe for Magnetism in Thin Films" (Contact: Arman Rahmim-- rahmim@physics.ubc.ca )
A. Rahmim, S. Tixier, T. Tiedje (UBC Physics) S. Eisebitt, M. Frewald, M. Loergen, R. Scherer, W. Eberhardt (IFF, FZ- Juelich, Germany) J. Luning, J. Stoehr (SSRL, Stanford University, CA) A. Scholl (ALS, LBNL, CA)We have explored the use of coherent resonant x-ray scattering for the study and characterization of magnetic domains in thin films, and have developed a new iterative technique capable of reconstructing domain structures of antiferromagnetic (AFM) and ferromagnetic (FM) thin films.We have first considered the case of soft x-ray scattering in reflection geometry from LaFeO3 thin films. The latter films possess two types of domains with their AFM orientations perpendicular to each other. X-ray magnetic linear dichroism (XMLD) at the Fe-L3 absorption edge gave rise to modulations of the scattering amplitudes according to the domain distribution, which in addition to surface roughness resulted in speckles in the diffracted intensity. We showed that the interference between the surface roughness scattering and the magnetic scattering can be used to increase the sensitivity of the x-ray speckle to magnetic phenomena. In a second experiment, we have studied resonant x-ray scattering in transmission geometry from FM domains of Co/Pt multilayers. Magnetic x-ray circular dichroism (MXCD) was exploited to obtain scattering contrast from the FM domains, which were oriented normal to the surface (i.e. parallel or antiparallel to photon helicity). By tuning the energy to the Co-L3 edge, magnetic speckle was very clearly demonstrated. The reconstruction technique, which is an extension of Fourier transform iterative algorithms, was shown to be very successful when applied to noisy simulated data in both geometries. Using this method, experimental speckle data from the FM domains of the Co/Pt multilayer have been inverted. The resulting magnetic domain distribution showed a remarkable similarity to the actual worm-domain structure as imaged using magnetic force microscopy (MFM). This, to our knowledge, is the first reconstruction of magnetic domains from experimental x-ray scattering data.The LaFeO3 samples were prepared by J. W. Seo, J. Fompeyrine, H. Siegwart and J-P. Locquet (IBM Rueschlikon, Switzerland). The Co/Pt multilayers were provided by O. Hellwig and E. Fullerton (IBM Almaden Research Center).
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CLS-News is an electronic newsletter to keep users informed about developments at the Canadian Light Source, the national synchrotron user facility located at the University of Saskatchewan, Saskatoon, SK. The current and past issues of CLS-News are available on the CLS web site: www.lightsource.ca/enews/index.php
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Last modified: 2012-01-19 17:01:07