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Working Group V

Photon Optics for Future Light Sources

Group Leader:Dr. Andreas K. Freund
European Synchrotron Radiation Facility
B.P. 220
F-38043 Grenoble Cedex, France
Telephone: +33 476 88 2040
Fax: +33 476 88 2542
Objective: The beams of fourth-generation light sources will raise new challenges for the optical elements needed for the optimization of phase space parameters according to the experimental requirements. The objectives of this Working Group are:
  1. to pinpoint the relevant problems,
  2. to evaluate them,
  3. to propose strategies to solve them.
Working Group Activities: The main optical elements are crystals, mirrors, gratings, multilayers and combinations of them, e.g., multilayer gratings, Bragg-Fresnel optics. All these devices have fundamental and technological performance limits in terms of their quality without and with heat load. These must be discussed in the light of the future extremely bright laser beams, both in the soft and in the hard X-ray regime.

The following topics are proposed for discussion by the Working Group members:

  1. FEL beam interaction processes with materials constituting the beamline elements (including slits and absorbers/attenuators).
  2. Matters related to the preservation of emittance/coherence, e.g., optical quality of surfaces:
    • Overview of coherence preservation of present-day optics.
    • Needs for improvements of optical performances.
    • Ways to upgrade existing devices for use in FEL beams.
    • New concepts.
  3. Matters related to the preservation of brilliance, e.g., radiation resistance, heat load:
    • Overview of brilliance preservation of present-day optics.
    • Needs for optics that can withstand FEL beams.
    • Ways to improve upon existing schemes and limits.
    • New concepts.
  4. Matters related to the time structure of FEL beams:
    • Pulse length preservation of optics.
    • Needs for optics to modify/control the time structure.
  5. Possibilities to perform experiments on existing sources.
Working Group Input/Output: We will get input from experts in the field of synchrotron X-ray optics who know the optics performance under the brightest presently available conditions and from other experts in the laser area who have experience with ultra-bright and ultra-short photon pulses. We will try to extrapolate from the existing knowledge to predict the performance of the optics for soft and hard X-ray FELs.

We will attempt to come up with an outline of R&D strategies to meet the future photon optics needs for FEL-based experiments.

Schedule of Presentations to the Working Group: Wednesday, April 7
Session 1: Joint Session of Working Groups I and V

Chairs: G. Materlik, A. Freund
Location: E1100 and E1200

10:30    Improving SASE Sources by Seeding    L. H. Yu
11:00    Atomic Resolution Holography    I. McNulty
11:30    Optics Needs for Future Light Sources
(A summary and conclusions of the Stanford 97 Meeting)
    J. Arthur
12:00    Lunch     
13:00    Overview of the Present LCLS X-ray Optics System    R. Tatchyn
13:30    Optics Needs for the DESY Project    H. Shulte-Schrepping
14:00    Multi-photon Methods    B. Adams
14:30    Break     
15:00    Outlook for Correlation Spectroscopy    S. Mochrie
15:30    Opportunities for Pump-Probe Methods    D. Umstadter
16:00    Working Group Progress Reports
(plenary session in the Auditorium)

Thursday, April 8
Working Group V, Sessions II and III

Chair: A. Freund

8:30    General participation with Working Group I sessions. Special topic groups to be organized, if needed.     
12:00    Lunch     
     Session II - Chair: A. Macrander
Location: B3100B (alternate: LOM 438)
13:00    Addressing the Optical Needs for Various Techniques     
14:00    Break     
     Session II (continued) - Chairs: J. Arthur, R. Tatchyn
Location: B3100B (alternate: LOM 438)
14:00    State-of-the-Art Optical Elements     
     Session III - Chair: A. Freund
Location: B3100B (alternate: LOM 438)
15:00    Optics R&D, beamline scenarios, report writing, and future planning     
Information and Preparations Requested of Working Group Members:

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:

  • Input on requirements for beamline optics to match the experimental needs and on the physics of FEL light - matter interaction mechanisms

From Working Groups II and III:

  • Input on the beam properties

From Working Group VII (possibly):

  • Input on testing and validating techniques
Information Requested of This Working Group by Other Working Groups: Requested by Working Group III:

  • 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?
List of Working Group Participants:
Masami AndoKEK
John ArthurSLAC
Lahsen AssoufidANL
Zhonghou CaiANL
Malcolm R. HowellsLBNL
Ruben KhachatryanANL
Szczesny (Felix) KrasnickiANL
Jacek KrzywinskiDESY
Wah-Keat LeeANL
Albert MacranderANL
Jorg MaserANL
Gerhard MaterlikDESY
Dennis MillsANL
Pedro A. MontanoANL
Colin NaveCLRC Daresbury Lab
Howard PadmoreLBNL
Horst Schulte-SchreppingDESY
Roman TatchynSSRL
Ming XieLBNL
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