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Accelerator Operations & Physics

Advance Photon Source
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Office of Basic Energy Sciences national synchrotron x-ray research facility

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Accelerator Operations & Physics News Archive

  • April 26, 2003: The example files and scripts for elegant have been updated. M. Yoon (SLAC) pointed out that many of the examples described in the manual were missing. Some of these have been restored. Look in the "PAR" subdirectory.
  • April 26, 2003: Version 3.0 of spiffe was released. It contains a number of bug fixes to version 2.4. Users should upgrade to the new version.
  • April 17, 2003: A bug was discovered in elegant's RFCW element by Paul Emma. If you are using a version downloaded between December 2002 and April 16, 2003, you should download an updated copy.
  • April 9, 2002: The Beam Parameters for varous running conditions is now online.
  • April 5, 2002: An update on progress on storage-ring R&D is available on-line (APS only).
  • November 21, 2001: A web page collecting information about SDDS and its applications is now available. If you are just getting interested in SDDS or elegant, this is a good place to start.
  • October 17, 2001: Version 14.5 of elegant has been released. The new version features an improved model for CSR in drift spaces and other improvements. See the manual for more information. Consult the installation guides to install the new version.
  • From September 12-18, 2001, low-emittance and top-up modes were combined for the first time for a user beam run. A current of 102mA in 23 bunches was maintained by topping up every 2 minutes. The lifetime was 7.4 hours with horizontal and vertical emittances of 3nm and 0.06nm, respectively.
  • A tutorial introduction to SDDS is now available. It includes data files that you can download to work along with progressive examples. The section on sddsplot should be particularly helpful.
  • An invited talk was given at FEL2001 on start-to-end simulations. It includes a discussion of the methods as well as comprehensive jitter simulations for the LCLS. An example of the CSR microbunching instability predicted by elegant is also given.
  • elegant example files updated:The example files and scripts for elegant have been updated. A few problems were fixed and some enhancements made. Thanks to J. Safranek (SLAC) for pointing some of these out.
  • elegant 14.4 available: Version 14.4 of elegant is available. The new version has numerous bug fixes, an improved model for CSR in drift spaces, body focusing in rf cavities, and more. For details, see the change notes.
  • SDDS 1.20 available: Version 1.20 of the SDDS Toolkit is available. There are several exciting new features: 1. The Windows version no longer requires the EXCEED X-Windows emulator. 2. There is an extension for the Python script language. 3. Several new programs were added: sddsbaseline, sddscliptails, and sddsgenericfit. 4. Programs that hitherto required entry of RPN-style equations will now also take algebraic equations.
  • SDDS/EPICS Demonstration Scripts Available: A set of Tcl/Tk scripts is available now for running demonstrations of data collection, analysis, and control using SDDS and EPICS. The demonstration involves a simulation of the orbit in a storage ring using the portable channel access server. This is a great way to learn to use SDDS in the EPICS context. See SDDS/EPICS Demonstration Scripts on the Accelerator Operations & Physics group's software download page for more information.
  • Bunch compressor helps LEUTL FEL saturate: With the help of the bunch compressor to increase the peak current, the APS LEUTL Free Electron Laser achieved saturation at 530 nm, a world record for shortest wavelength. We extend our congratulations to the entire LEUTL team.
  • In late July, 2000, we began commissioning of the new bunch compressor in the APS linac. The system performed very well and compression factors of 4-6 are now routinely achieved. Some photos of the bunch compressor are available here.
  • Starting on June 27, 2000, APS ran in top-up mode for users for six days. Injection occured at about 2 minute intervals for six days, maintaining stored beam of about 102mA almost continuously. This is a first for a synchrotron light source and shows that top-up mode is practical. See the current history during the top-up run here.