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Working Group III

Ring-Based Sources

Group Leader:Dr. Marie-Emmanuelle Couprie
Manager, 350 nm FEL Beamline of Super-ACO
LURE Bat. 209 D
Univ. de Paris-Sud. BP34
91 898 Orsay cedex, FRANCE
Telephone: (33 1) 64 46 80 44
Fax: (33 1) 64 46 41 48
Objective: The Ring-Based Sources Working Group will address the following subjects:
  • Identificaion of new research opportunities made possible by extending the performance of storage rings
  • Present and ultimate performance of storage rings in comparison with alternative sources
  • Storage ring longitudinal/transverse dynamics experiments versus theory
Working Group Activities: The working group will follow a schedule of discussions and 15-20 minute presentations by the working group members. Each working group session will address a specific topic. Working group members are encouraged to submit proposals for presentations.

Session 1: Introduction to Coherence

    Temporal coherence, spatial coherence, and their relation to brilliance

    Comparison of coherence of spontaneous synchrotron radiation, storage ring FEL, and linac-driven FEL sources

Session 2: Transverse Storage Ring Dynamics: Emittance, Stability, Lattice Design
    Reports of operating performance from facilities worldwide
Session 3: Longitudinal Storage Ring dynamics: Short Electron Bunches
    Recent results, new projects, operation with low momentum compaction
Session 4: Modelling Longitudinal Dynamics
    Assessment of the capability of modelling tools to predict the length and energy spread of a high-current bunch in a storage ring
Session 5: Present and Ultimate Performance of Storage Rings for Synchrotron Radiation
    Sub-picosecond experiments on rings, diffraction-limited soft x-ray sources (e.g. SOLEIL)
Session 6: Storage Ring FEL Status Reports from Operating Facilities
    Comparison with alternative sources, user applications, compatibility with programs at other beamlines, dedicated versus non-dedicated operation of storage-ring FELs

    Interaction of a stored electron beam with laser light

    Externally applied lasers, beam cooling, energy modulation

Session 7: Ultimate Performance of a Storage Ring FEL in the UV-VUV
    Oscillators, harmonic generation by the FEL or by means of an externally applied laser; performance limits of optics and status of optics R&D; limits on pulse duration, brilliance and stability.
Session 8: Report Preparation
Working Group Input/Output:  
Schedule of Presentations to the Working Group:  
Information and Preparations Requested of Working Group Members: Working group members are requested to complete a questionnaire describing the status and performance of the rings at their home facilities.

Group members making presentations are requested to bring color copies and, if possible, electronic files of their presentation material for inclusion in the workshop proceedings.

Information Requested of Other Working Groups: From Working Group I:

  • What performance parameters of storage rings and storage ring FELs are most imporant targets for improvement?
  • How can one characterize the relative importance of brilliance versus other parameters, such as flux?

From Working Group II:

  • In what ways may ring-based sources complement linac-based sources and vice versa?

From Working Group IV:

  • Are there any innovations in insertion device design that should be taken into account in exploring the limits of storage ring performance?

From Working Group V:

  • What are the performance limits of conventional lasers that might be used in conjunction with a sycnhrotron radiation source? For example, what limits are there on repetition rates?

From Working Group VI:

  • Please provide information on new detectors for understanding beam and light source dynamics.
Information Requested of This Working Group by Other Working Groups: Requested by Working Group IV:

  • Tolerable trajectory wander and tolerable phase errors in long undulators.
  • What is the appropriate parameterization for specifying integrated multipoles of insertion devices in storage rings:
    1. multipole expansion with respect to the ID-center
    2. a transverse distribution of integrated fields
    3. something else
  • Are there important tolerances that have not yet been addressed like second field integrals for quadrupole or sextupole errors?
  • Is there a chance for energy spread reduction in third-generation storage rings?
  • Are the tracking tools for insertion devices sufficient and is there evidence from measurements that the codes yield correct answers?
Requested by Working Group VI:

  • Input on the impact of laser beams on storage rings.
List of Working Group Participants:
Ake AnderssonMax Lab
Michael BorlandANL
John ByrdLBNL
Jeff CorbettSLAC
Les DallinSaskatchewan Accelerator Lab
Bruno DiviaccoSincrotrone Trieste
Louis EmeryANL
Kuanjun FanNSRL, USTC
Laurent FarvacqueESRF
William FawleyLBNL
Jorg FeikesBESSYII
Jean-Marc FilholESRF
Hiroyuki HamaInstitute for Molecular Science
Katherine HarkayANL
Kohji HirataKEK
Zhirong HuangANL
Daoman JiangNSRL, USTC
Shaukat KhanBESSY
Gennady KulipanovBudker Institute of Nuclear Physics
Jean-Louis LaclareProjet SOLEIL
Eliane LessnerANL
Marie-Paule LevelProjet SOLEIL
Vladimir LitvinenkoDuke University
Alex LumpkinANL
Alban MosnierProjet SOLEIL
Graham NaylorESRF
Howard PadmoreLBNL
Mike PooleCLRC, Daresbury Lab
Annick RopertESRF
Jouri SenichevAarhus University
Nicholas S. SerenoANL
Robert SchoenleinLBL
Victor P. SullerCLRC, Daresbury Lab
Hitoshi TanakaSPring-8
Lidia TosiSincrotrone Trieste
Min-Huey WangSRRC
Xiangqi WangNSRL, USTC
Thomas WeisUniversitaet Dortmund
Gode WuestefeldBESSY
Tetsuo YamazakiInstitute of Advanced Energy
Yan YinYY Labs, Inc.
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