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BESSY IIcallforproposals

  • March 1st for proposals eligible for the period starting from August 1st to January 31st
  • September 1st for proposals eligible for the period starting from February 1st to July 31st

BESSY IIApplications

Insight into inner magnetic layersMessages from SpaceGraphene towards 2D superconductivityHydrogen stability in hydrogenated amorphous carb...

BESSY IIBeamlines

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The third generation storage ring BESSY II is in operation since 1999 and provides ultrabright photon beams from the long wavelength Terahertz region to hard X-rays with complete control of the energy range and the polarization of the radiation. The facility is operated by the Helmholtz-Zentrum Berlin. ALINAC (LINear ACcelerator) injecting into the full energy synchrotron boosteris currently under commissioning, in preparation of the implementation offull top-upmode scheduled for the second half of 2012. In order to further improve the stability of the beam,a fast orbit feedback systemwill be implemented in 2012. With its more than 50 beamlines, BESSY II offers a multi-faceted mixture of experimental opportunities: unique undulators provide circular and rotating-linear polarization; world record energy resolution (e.g. > 100.000 at 60 eV) has been demonstrated by BESSY II beamlines. Experimental facilities include state-of-the-art x-ray microscopy, x-ray polarimetry, spectromicroscopy, high-resolution photon and electron spectroscopy, nanotechnology (e.g. x-ray lithography), and pump-probe spectroscopy with temporal resolution ranging from 50ps down to 100fs at the uniqueslicing facility. Recently, HZB has extended its suite of state-of-the-art experimental chambers for the studies of liquids by the new measuring chamber for x-ray emission spectroscopy of free micro-liquid jets,LiXEdrom. The combination of brightness and time resolution makes BESSY II the ultimate microscope for space and time, since both femtosecond time and picometer spatial resolutions are available.

Photon beam parametersBESSY II
Energy [GeV]1.72
Current [mA]300
Circumference [m]240
Number of bending magnets32
Number of straight sections in use14
Operative beamlines46
Beamlines under construction5
Average beam lifetime [h]10 h @ 300mA
Energy loss per turn (without IDs) [keV]180
Beam size in insertion devices [mm]Low Beta 74 / 9.5 (hor/ver) High Beta 265 /16.2 (hor/ver)
Beam size in bending magnets [mm]50/41 (hor/ver)
last update by cblasetti on 12/24/2015 1:30:59 PM



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