Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

First X-ray lasing of SACLA

11.07.2011
The world’s second X-ray Free Electron Laser (XFEL) recently went online in Japan, hot on the heels of the first, the Linac Coherent Light Source (LCLS) at the SLAC National Accelerator Laboratory in the US, which began operating in the hard X-ray region in 2009.

The world’s second X-ray Free Electron Laser (XFEL) recently went online in Japan, hot on the heels of the first, the Linac Coherent Light Source (LCLS) at the SLAC National Accelerator Laboratory in the US, which began operating in the hard X-ray region in 2009.

The advent of lasers in 1960 led to a fundamental change in photon science and technology due to the unprecedented intensity, high degree of coherence and narrow pulse width of the light that lasers can emit.

Since then, tremendous efforts have been made toward creating shorter-wavelength lasers in the hard X-ray region, with expectations for fundamental changes in X-ray science and technologies similar to those seen in the infrared, visible and ultraviolet spectral regions. As the spatial resolution of observations using light is directly related to the wavelength of light used, one of the biggest advantages of using shorter wavelength, X-ray light is the significant resolution enhancement is provides—allowing observation of subnanometer-scale structures such as atoms and molecules.

X-ray lasers cannot be built with the same technologies used to create conventional, longer-wavelength lasers. Accelerator-based free-electron lasers, however, using a self-amplified spontaneous emission (SASE) scheme, are able to generate coherent electromagnetic radiation in the X-ray region. The SASE X-ray Free Electron Laser consists of a high-performance electron linear accelerator (LINAC) and a long undulator, in which high-energy, high-density, low-emittance electron bunches are alternatively deflected in a periodic magnetic field, causing them to emit quasi-monochromatic X-rays at an energy determined by the electron energy, the magnetic field strength and the magnetic period.

The interaction between the electromagnetic field of the emitted X-rays and the electron bunch as it travels through the long undulator eventually aligns the electrons in the bunch with the period of the X-ray wavelength. The principle of SASE is that the aligned electrons move coherently in the magnetic field of the undulator to emit coherent X-rays.

Construction projects for SASE XFEL facilities began to be discussed in the US and Europe around 2000, and later materialized as the LCLS and Euro-XFEL projects. At that time, an 8 GeV electron storage ring for synchrotron radiation facility, SPring-8, was being commissioned in Japan. SPring-8 was one of three large-scale synchrotron radiation sources in the world at the time, alongside European Synchrotron Radiation Facility (ESRF) in France and the Advanced Photon Source (APS) in the US. As the technologies developed for the construction of SPring-8 are very similar to those necessary for an XFEL, the concept of the SPring-8 Compact SASE Source (SCSS), a prototype of an SASE XFEL, emerged.

To support this prototype, an in-vacuum undulator technology, higher-frequency accelerator tubes in the C-band (5,712 MHz) and a combination of a classical thermionic electric gun with a CeB6 single crystal as cathode were adopted. Based on this concept, an SASE XFEL with an 8 GeV LINAC capable of emitting coherent electromagnetic radiation at a wavelength 0.06 nm was designed. This combination of technologies allowed the facility to be constructed at a third of the length of the LCLS or Euro-XFEL facilities, measuring just 700 m.

Following the prototype SCSS project, the construction project for the XFEL was launched in FY2006 as one of the Japanese government’s ‘Key Technologies of National Importance’. At the end of FY2010, all the hardware was in place, and the facility was named the SPring-8 Angstrom Compact Free Electron Laser, or SACLA.

One of the unique features of the facility compared with the LCLS and Euro-XFEL, is its co-location with the SPring-8 synchrotron radiation facility. A new building was set up to allow the XFEL and SPring-8 X-ray beams to intersect at a sample, which will make it possible to use SPring-8 rays to observe how materials relax following an instantaneous impact from the XFEL beam. An electron beam transport from the XFEL LINAC to the SPring-8 storage ring was also built to allow the XFEL LINAC to be used as an injector for SPring-8. Electron beam commissioning for this brand-new SACLA facility began in March 2011.

On June 7, the first SASE lasing was observed at SACLA. Plans now call for reaching SASE saturation and for the initiation of X-ray optics commissioning and end-station commissioning in FY2011. In March 2012, the facility will be opened to public users from around the world.

gro-pr | Research asia research news
Further information:
http://www.riken.jp
http://www.researchsea.com

More articles from Physics and Astronomy:

nachricht Smallest transistor worldwide switches current with a single atom in solid electrolyte
17.08.2018 | Karlsruher Institut für Technologie (KIT)

nachricht Protecting the power grid: Advanced plasma switch for more efficient transmission
17.08.2018 | DOE/Princeton Plasma Physics Laboratory

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: It’s All in the Mix: Jülich Researchers are Developing Fast-Charging Solid-State Batteries

There are currently great hopes for solid-state batteries. They contain no liquid parts that could leak or catch fire. For this reason, they do not require cooling and are considered to be much safer, more reliable, and longer lasting than traditional lithium-ion batteries. Jülich scientists have now introduced a new concept that allows currents up to ten times greater during charging and discharging than previously described in the literature. The improvement was achieved by a “clever” choice of materials with a focus on consistently good compatibility. All components were made from phosphate compounds, which are well matched both chemically and mechanically.

The low current is considered one of the biggest hurdles in the development of solid-state batteries. It is the reason why the batteries take a relatively long...

Im Focus: Color effects from transparent 3D-printed nanostructures

New design tool automatically creates nanostructure 3D-print templates for user-given colors
Scientists present work at prestigious SIGGRAPH conference

Most of the objects we see are colored by pigments, but using pigments has disadvantages: such colors can fade, industrial pigments are often toxic, and...

Im Focus: Unraveling the nature of 'whistlers' from space in the lab

A new study sheds light on how ultralow frequency radio waves and plasmas interact

Scientists at the University of California, Los Angeles present new research on a curious cosmic phenomenon known as "whistlers" -- very low frequency packets...

Im Focus: New interactive machine learning tool makes car designs more aerodynamic

Scientists develop first tool to use machine learning methods to compute flow around interactively designable 3D objects. Tool will be presented at this year’s prestigious SIGGRAPH conference.

When engineers or designers want to test the aerodynamic properties of the newly designed shape of a car, airplane, or other object, they would normally model...

Im Focus: Robots as 'pump attendants': TU Graz develops robot-controlled rapid charging system for e-vehicles

Researchers from TU Graz and their industry partners have unveiled a world first: the prototype of a robot-controlled, high-speed combined charging system (CCS) for electric vehicles that enables series charging of cars in various parking positions.

Global demand for electric vehicles is forecast to rise sharply: by 2025, the number of new vehicle registrations is expected to reach 25 million per year....

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

LaserForum 2018 deals with 3D production of components

17.08.2018 | Event News

Within reach of the Universe

08.08.2018 | Event News

A journey through the history of microscopy – new exhibition opens at the MDC

27.07.2018 | Event News

 
Latest News

Quantum bugs, meet your new swatter

20.08.2018 | Information Technology

A novel synthetic antibody enables conditional “protein knockdown” in vertebrates

20.08.2018 | Life Sciences

Metamolds: Molding a mold

20.08.2018 | Information Technology

VideoLinks
Science & Research
Overview of more VideoLinks >>>