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
Email: freund@esrf.fr
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:
- to pinpoint the relevant problems,
- to evaluate them,
- 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:
- FEL beam interaction processes with materials constituting the beamline
elements (including slits and absorbers/attenuators).
- 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.
- 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.
- Matters related to the time structure of FEL beams:
- Pulse length preservation of optics.
- Needs for optics to modify/control the time structure.
- 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 Ando | KEK |
| John Arthur | SLAC |
| Lahsen Assoufid | ANL |
| Zhonghou Cai | ANL |
| Malcolm R. Howells | LBNL |
| Ruben Khachatryan | ANL |
| Szczesny (Felix) Krasnicki | ANL |
| Jacek Krzywinski | DESY |
| Wah-Keat Lee | ANL |
| Albert Macrander | ANL |
| Jorg Maser | ANL |
| Gerhard Materlik | DESY |
| Dennis Mills | ANL |
| Pedro A. Montano | ANL |
| Colin Nave | CLRC Daresbury Lab |
| Howard Padmore | LBNL |
| Horst Schulte-Schrepping | DESY |
| Roman Tatchyn | SSRL |
| Ming Xie | LBNL |
|
