WP14: TA9 – Trans-national Access to BESSY II
Provision of access to the following infrastructure(s): BESSY II
Description of the infrastructure
The BESSY II synchrotron radiation source at Helmholtz-Zentrum Berlin (HZB) is a 3rd-generation 1.7 GeV storage ring dedicated to the VUV and soft X-ray photon energy range. The source and the instrument suite are very versatile and provide photons at a high average brilliance. Purpose-made insertion devices allows for energy, spatial, temporal and polarisation control of the photon beam. BESSY II is a multi-user facility with currently 48 beamlines and endstations, with 31 thereof in use simultaneously. BESSY II serves a wide user community of more than 3,000 users per year, hosting on average about 800 beamtime campaigns. BESSY II operation covers a multitude of operating modes from multi-bunch hybrid as a standard to single bunch, low-α operation and femtosecond-slicing for time-resolved experiments in the ps to fs regime. A major upgrade of the existing storage ring into a variable-pulse-length storage ring (BESSY VSR) offering long and short pulses is planned and shall be realised in 2020.
Outstanding infrastructures at BESSY II comprise the femtosecond facility with a steadily increasing user demand. Increased flux and stability after the upgrade to the new zone plate monochromator installed in 2012 as well as the implementation of top-up operation and the fast orbit feedback system in the storage ring makes BESSY II a leader in femtosecond time-resolved XMCD measurements and enables new types of high impact science experiments
BESSY II’s time structure is extremely well suited for Angular Resolved Time of Flight (ARTOF) photoemission measurements. This method is currently available at two beamlines, one dedicated to sensitive samples (LowDosePES) and one to coincidence experiments. Further instrumental highlights are the ARPES-stations 1-square and 1-cube for investigations of correlated electron systems, topological insulators and superconductors which allow for highest resolution (1 meV) and in case of the 1-cube sample temperatures below 1K.
The X-ray microscopy activities at BESSY II are among the leading worldwide. A spatial resolution of 10 nm has been achieved in transmission X-ray microscopy (TXM) and the gap in resolution and contrast between optical microscopes and electron microscopes has been closed with elemental and chemical contrast which is of high relevance to life sciences 10. In the near future, installation of a new undulator covering the tender X-ray energy range will significantly extend the possibilities at the microscopy beamline. Two new user beamlines, PEAXIS (Photo Electron Analysis and X-ray Resonant Inelastic Spectroscopy for materials in solution) and METRIX (Momentum and Energy Transfer Resonant Inelastic X-ray Scattering), will become operational by the beginning of 2017.
A major new development at BESSY II is the Energy Material In-situ Laboratory EMIL. The combination of soft to tender X-ray spectroscopic methods in one experiment with the provision of specialised laboratory environments, allows in-situ analysis of energy materials during deposition processes and during operation.
|Name of the infrastructure (and
its installations, if applicable)
|Location of the infrastructure||Berlin, GERMANY|
|Services currently offered by the infrastructure||The user community spans a large variety of disciplines ranging from physics, chemistry, energy materials research, biology, medical and pharmaceutical research, to cultural heritage investigations.|
Modality of access & application procedure
|Modality of access||Calls for proposal:
HZB has established a Scientific Selection Panel (SSP) composed of international experts covering a broad variety of scientific fields for an objective and competent selection of projects to be supported. The SSP meets twice a year at HZB. The selection of users funded by European Programs is fully integrated with this peer-review selection process and based on scientific merit. The proposal submission is web-based; a submission through the wayforlight.eu portal is possible though import of wayforlight.eu proposals into the HZB proposal portal.
BESSY II operation:
HZB operates two large scale facilities, BER II and BESSY II, for providing a national and international user community with neutrons and synchrotron radiation infrastructures for research. Beamtime at the facilities is granted in the framework of a peer-reviewed proposal system.
Experiments performed must be followed by a technical feedback and a scientific report. In addition, HZB expects that the results of the experiments are published in refereed journals. Experimental reports and publications are the main deliverables.
More information about the Trans-national Access funding by HZB – BESSY II you will find here.
|Outreach to new users||
|Review procedure||HZB has established a Scientific Selection Panel (SSP) composed of international experts covering a broad variety of scientific fields for an objective and competent selection of projects to be supported. The SSP meets twice a year at HZB. The selection of users funded by European Programs is fully integrated with this peer-review selection process and based on scientific merit.|