Report on the XFEL STI Round Table Workshop

Transcription

1 Report on the XFEL STI Round Table Workshop June 22-24th, 2004 background workshop XFEL preparatory phase Jochen R. Schneider DESY

2 Approaching the European XFEL Facility Steering Committee chairman: H. Schunck (Federal Ministry of Education and Research) kick-off meeting: Febr. 2 nd, nd meeting: May 26 th, rd meeting: September 27 th, th meeting: January 18 th, 2005 Working Group on Scientific & Technical Issues chairman: F. Sette (ESRF, Grenoble, France) kick-off meeting: April 1 st /2 nd, nd meeting: June 22 th -24 th, rd meeting: September 27 th /28 th, 2004 Working Group on Administrative & Funding Issues chairman: H.-F. Wagner (Federal Ministry of Education and Research) kick-off meeting: March 19 th, nd meeting: May 24 th /25 th, rd meeting: July 19 th, th meeting: October 11 th /12 th, th meeting: December 20 th /21 st,

3 Steering Committee May 26 th, 2004 Report by the chairman of the STI working group, F. Sette: An interim report on scientific and technical issues (site, accelerator and injector, XFEL process, beamlines and scientific exploration) will be presented to the Steering Committee by the end of To prepare this report a round table workshop will take place at DESY on June 22 to 24, 2004, and address the abovementioned topics. Consensus exists among the STI members that the site proposed by DESY is appropriate, the superconducting accelerator technology developed by the TESLA collaboration offers the highest flexibility, the SASE process is most mature, but the facility should keep options to incorporate other XFEL processes later, special efforts are necessary to develop appropriate detectors in time. Corresponding resources are not included in the project cost estimation at present. It will be clarified which experiments need a higher repetition rate than foreseen in the existing Technical Design Report and its supplement. 4

4 STI Round Table Workshop June th, 2004 SCIENCE CASE (I): 1. Introduction (chair: G. Materlik ) Introduction on XFEL beam properties (ultra-short pulses, intensities, brilliance, energy tunability, polarization, ) (J. Hastings) Introduction on coherence (coherence parameters, applications,..) (B. Stephenson) 2. The XFEL in Biology and Chemistry (chair: M. Altarelli) Potentials of XFELs in Biology (J. Hajdu) Ultra-fast chemical dynamics (S. Techert) 3. Extreme and/or novel states (chair: J. Wark) Generation of solid-density plasmas (R. Lee) Multiple Ionization and multi-photon events (J. Ullrich) Attosecond physics (M. Drescher) 4. General Discussion (chair: J. Hastings) 5

5 STI Round Table Workshop June th, 2004 SCIENCE CASE (II): 1. Dynamics (chair: A. Rousse) Ultrafast structural dynamics in condensed matter (K. Sokolowski-Tinten) Magnetization Dynamics (H. Duerr) Disordered materials & soft matter (J. Daillant) Dynamics of hard condensed matter materials (H. Poulsen) Ultra-fast X-ray Science (E. Collet) 2. Non-linear phenomena (chair: J. Hajdu) Clusters structure and dynamics studied with X-ray FEL pulses (T. Möller) High field science (A. Ringwald) 3. General Discussion and Summary: Science Case (chair: M. Altarelli) 6

6 Discussion Science Case Requirements for detector systems Short pulses / coherence / phase control Time structure / bunch structure Shorter wavelengths Polarization preparation and handling of samples XFEL+ facility will have to provide standard lasers - users have to supply special lasers (PW, etc.) - laser center needed close-by with expertise - synchronization central responsibility of the facility 7

7 STI Round Table Workshop June th, 2004 ACCELERATOR RELATED ISSUES: 1. Presentations from XFEL project group (chair: E. Jaeschke) The VUV-FEL as a Pilot Facility for the XFEL (J. Rossbach) Accelerator Overview and Parameters (R. Brinkmann) Generation of High Quality Beam (K. Floettmann) Beam Distribution and Stabilization (W. Decking) Additional short presentation: FELs for MAX-Lab and Lund Laser Center (S. Werin) BESSY soft X-ray facility (D. Kraemer) ELETTRA (C. Bocchetta) Frascati (L. Palumbo) 2. Discussion (chair: E. Jaeschke + R. Brinkmann) 8

8 Discussion Accelerator Beam Quality: Beam Energy: Pulse Structure: Stability: Undulators: Diagnostics: energy E/E max. energy needed variation timing Duty cycle CW consequences for injectors pulse to pulse in train, pulse trains sc, helical, background from spontaneous radiation e-beam and X-ray beams 9

9 STI Round Table Workshop June th, 2004 XFEL PROCESS: 1. Introduction (chair: M.E. Couprie) Baseline design of the SASE radiators of the European XFEL, basic parameters, staging of the project (J. Feldhaus) 2. Alternative Approaches (chair: R. Bakker ) Alternative coherent sources of short-wavelength radiation in the soft and hard X-ray range, not based on accelerators; comparison with the European XFEL (J. Tisch) Seeding and high gain harmonic generation schemes in the European XFEL framework (L. Giannessi) 3. Short Pulses (chair: C. Pellegrini) A review of the different schemes (proposed by SLAC and LBL) for shorter FEL pulses in the 10 fs to the attosecond range: Application to the European XFEL (D. Garzella) Attosecond pulses (E. Saldin) Summary and Future Options (M. Yurkov) 10

10 Discussion X-FEL Process Differences between hard and soft X-ray FELs soft X-rays: HHG (Brookhaven and EUROFEL collaboration) VUV-FEL should test seeding concepts hard X-rays: start with well known SASE technique leave space for further options to be realized later seeding schemes important to get short pulses <10 fsec 11

11 Steering Committee May 26 th, 2004 The Steering Committee takes note of the report and confirms that the STI working group is addressing all relevant topics. H. Schunk recommends to always consider the limited budget envelope in the discussions within the STI working group. The Steering Committee affirmed the Memorandum of Understanding for the preparatory phase of the XFEL project drafted by the AFI working group. The deadline for the signature of the Memorandum of Understanding is September 30, If the signing parties take responsibilities and workloads for the XFEL project after signature of the MoU they are asked to inform the secretary of the Steering Committee on such contributions for later bookkeeping. 12

12 European XFEL Preparatory Phase Overview of budget/resources according to the present planning status. Investment (M ) Planned investment (status May 2004) Reserve Expected total available for investment & additional personnel Personnel (FTE) Estimated demand Available at DESY additional FTE needed Manpower from outside DESY is needed 13

13 European XFEL Preparatory Phase XFEL Project at DESY structured in 37 work packages in 6 groups WP group Topic Linear Accelerator Accelerator Sub-systems Photon Beam Lines General Issues Infrastructure Site and Buildings project leader: deputy project leader: Administrative project coordinator: R. Brinkmann A. Schwarz T. Delissen 14

14 European XFEL Preparatory Phase Several European Institutes as members of the TESLA collaboration are already contributing, for a long time or since more recently, to technical developments relevant for the XFEL facility. Examples (not exhaustive) are: LAL-Orsay (RF power couplers), CEA-Saclay (BPMs for the linac, cavity tuner), INFN-Milano (acc. modules/cryostats, RF-gun cathodes), INFN-Frascati (beam diagnostics), CIEMAT (superconducting magnets), PSI (feedback systems, electronics). 15

15 Review of VUV FEL Proposals (Sep , 2002) 30 proposals submitted 12 Areas of Proposed Research 18 individual projects plasma physics proposal with 12 projects number of projects about 200 scientists from 60 institutes in 11 countries involved optical lasers community: 18 synchrotron community: technical developments atoms ions clusters solids surfaces plasmas biological samples Applications: spectroscopy with ultra-short photon pulses pump probe techniques nonlinear effects plasma physics 16

16 VUV-FEL time schedule (tentative) Saturation in wavelength range nm July 2005 User operation (extended period) Operation with full electron beam current (to be defined) Dec User operation (extended period) 3rd Harmonic RF system and ACC6 installed Feb GeV beam energy April 2006 Saturation 6 nm June 2006 User operation (extended period) Seeding Option installed Dec Seeding demonstration April 2007 Beam time allocation panel to be established