Bulletin of the American Physical Society
APS April Meeting 2014
Volume 59, Number 5
Saturday–Tuesday, April 5–8, 2014; Savannah, Georgia
Session J10: Invited Session: Large Scale International Facilities I: Photon Sources |
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Sponsoring Units: FIP DPB Chair: Esen Alp, Argonne National Laboratory Room: 204 |
Sunday, April 6, 2014 10:45AM - 11:21AM |
J10.00001: LCLS -- The Upgrade Path Invited Speaker: Uwe Bergmann With ultrashort and ultrabright X-ray pulses ($>$ 10$^{12}$ photons in pulses of $<$ 100 femtosecond length) X-ray Free electron lasers provide revolutionary new capabilities to study a wide range of phenomena including novel states of matter, quantum materials, ultrafast chemistry and structural biology. Starting operations in 2009 the Linac Coherent Light Source (LCLS) at SLAC has been the first of such machines delivering 280 eV - 11 keV X-ray pulses to users at a rate of 120 Hz. The success of the LCLS has positively impacted numerous efforts around the world and there are now five hard X-ray FELs in operation or under construction in addition to two FELs that operate in the VUV and soft X-ray region. The planned LCLS upgrade, LCLS-II, has recently been modified in order to address the recommendation of a report of the Basic Energy Science Advisory Committee from last summer. We will present examples of some of the most exciting LCLS science highlights, discuss operation upgrades and present the parameters of the new LCLS-II upgrade. [Preview Abstract] |
Sunday, April 6, 2014 11:21AM - 11:57AM |
J10.00002: European XFEL: Status and Overview of Research Instrumentation Invited Speaker: S.L. Molodtsov The European XFEL is a new international research installation that is currently under construction in the Hamburg area in Germany. The facility will generate new knowledge in almost all the technical and scientific disciplines that are shaping our daily life--including nanotechnology, medicine, pharmaceutics, chemistry, materials science, power engineering and electronics. The ultra-high brilliance femtosecond X-ray flashes of coherent radiation will be produced in a 3.4-kilometre-long facility. Most of it will be housed in tunnels deep below ground. Three sites will provide access to the tunnels and the experiment stations. In its start-up configuration, the European XFEL will comprise 3 self-amplified spontaneous emission (SASE) light sources--undulators operating in energy ranges 3 - 25 keV (SASE 1 and SASE 2) and 0.2 - 3 keV (SASE 3), respectively. The world-unique feature of this XFEL is the possibility to provide up to 27.000 ultra-short flashes (10 - 100 fs) that makes the facility particular suitable for time-resolved spectroscopies including photoemission, (resonance) inelastic X-ray scattering and imaging studies in the range of moderate and hard X-ray photons. Six experimental stations optimized for particular purposes will be installed. Each experiment requires light with special properties, such that the stations are permanently assigned to the different light sources (beamlines) of the European XFEL. In June 2013, underground civil engineering work (tunnels, shafts, halls) has been finished at all three construction sites. In this presentation status and further parameters of the European XFEL facility as well as planned research instrumentation are reviewed. [Preview Abstract] |
Sunday, April 6, 2014 11:57AM - 12:33PM |
J10.00003: SPring-8 and SACLA Plans for the Future Invited Speaker: Tetsuya Ishikawa SPring-8, a 3$^{rd}$-generation synchrotron radiation facility in Japan currently operates at 2.4 nm.rad electron beam emittance, is planning to upgrade to operate below 100 pm.rad by changing the present Chasman-Green lattice to 5 bend achoromat lattice, with keeping positions of all the straight sections as they are. The upgrade, combined with the development of X-ray focusing optics down to nm focal spot size, helps revealing local properties of heterogeneous materials in a non-destructive manner, while the most of the present applications observe the averaged properties of the samples which are assumed to be homogeneous. The upgrade will hopefully be completed within 10 years. SACLA (SPring-8 Angstrom Compact LAser), an X-ray free electron laser adjacent to SPring-8, is the world's second SASE X-ray source following to LCLS (Linac Coherent Light Source) at the SLAC National Accelerator Laboratory. New undulator technology permits us to downsize the facility length to be 700 m which is 1/3 of LCLS and 2/9 of Euro XFEL. We have constructed a tight focusing system for the XFEL beam to obtain 50 nm focal spot diameter. The power density of the focused XFEL reached 10$^{20}$ W/cm$^2$. We are currently designing 7 nm focusing system to get the high power density of 10$^{22}$W/cm$^2$. We are seeking for the ways to further downsize the facility length. Our temporary goal at the moment is to build 100 m long hard X-ray FEL facility in middle 2030s. R{\&}Ds for the mini-pole undulators and higher energy gradient linear accelerator are starting soon. [Preview Abstract] |
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