Chinese Academy of Sciences (PDF) - low res version

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CAS/In Focus
A view of the Shanghai Synchrotron Radiation Facility campus.
SSRF Phase-I Beamlines
BL08U1-A: Soft X-Ray Spectromicroscopy Beamline
BL13W1: X-Ray Imaging and Biomedical Applications Beamline
BL14W1: XAFS Beamline
BL14B1: Diffraction Beamline
BL15U1: Hard X-Ray Micro-Focusing Beamline
BL16B1: Small Angle X-Ray Scattering Beamline
BL17U1: Macromolecular Crystallography Beamline
Shanghai Synchrotron Radiation Facility
The Shanghai Synchrotron Radiation Facility (SSRF) is a third-generation
medium-energy light source. It consists of a 150 MeV electron linac, a
full-energy booster, a 3.5 GeV electron storage ring, and seven Phase-I
beamlines and experimental stations (see table above). The SSRF storage
ring, consisting of 20 lattice cells, is designed to run at a beam current
of 200~300 mA in beam emittance of 3.9 nm.rad. It can provide a very
bright light beam in both the soft X-ray and hard X-ray regions, ranging
from 0.1 keV to 40 keV, and a maximum brilliance of 10 20 photons/s/mm 2 /
mrad 2 /0.1%BW can be produced using advanced insertion devices.
Since May 2009, SSRF has provided 4,000 to 4,500 hours of beam
time annually, with a beam availability of 95.7% and 97.6% in 2010 and
2011, respectively. To date it has accepted 2,171 research proposals and
received 3,780 individual users, with 9,710 user visits from 235 institutions.
Over 400 papers have been published using SSRF
data, including 12 papers in Nature, Science, and Cell,
and 89 papers in other high-impact journals. SSRF
has become a very important experimental platform
in China for studies in structural biology, chemical
and environmental sciences, condensed matter
physics, materials science, nanosciences, biomedical
applications, and many other multidisciplinary fields.
However, the existing beam lines at SSRF are far from
meeting users’ demands. New beam lines are currently
under construction with further lines proposed in the
future. In addition, a soft X-ray free-electron laser
facility will be built on the campus adjacent to SSRF.
So far, SSRF has signed collaboration agreements
with nearly 20 synchrotron radiation laboratories
around the world, and is interested in strengthening
further international cooperation involving both the
synchrotron radiation facility and its application.
Contact: Dr. Hou Zhengchi, houzhengchi@
sinap.ac.cn
The Guoshoujing Telescope during winter.
Aperture of
primary mirror
Aperture of
reflecting corrector
Main Characteristics of LAMOST
Effective aperture in
diameter
Research
Guoshoujing Telescope
The Guoshoujing Telescope, or Large Sky Area Multi-Object Fiber Spectroscopic
Telescope (LAMOST), is a quasi-meridian reflecting Schmidt telescope
located in the Xinglong Station, a National Research Facility open to
the astronomical community and operated by the National Astronomical
Observatories of China (NAOC).
Its optical system consists of a reflecting Schmidt corrector, Ma, at the
northern end, a spherical primary mirror, Mb, at the southern end, and a
focal plane in between. Mb has a size of 6.67 m x 6.05 m, which consists of
37 hexagonal spherical sub-mirrors, each with a diagonal diameter of 1.1 m
and a thickness of 75 mm. Ma is 5.72 m x 4.40 m and consists of 24 hexagonal
plane sub-mirrors with a diagonal diameter of 1.1 m and a thickness
of 25 mm. The 4 m focal plane accommodates up to 4,000 fibers, which
collects light from distant and faint celestial objects, allowing several tens of
thousands of spectra per night to be achieved. This is the highest spectrum
acquisition rate in the world and will be a useful tool for studying the largescale
structure of the universe, the structure and evolution of the Milky Way,
and the cross-identification of multiwaveband surveys of celestial objects.
Observation plans for the first pilot project were designed in 2011
with the help of scientists in the Center for Operation and Development
of LAMOST. The pilot survey began on October 23, 2011, and
by the end of 2011, 230,000 spectra across 117 observation areas
were released.
Contact: Dr. Wang Dan, dwang@nao.cas.cn
Field of view Focal plane
6.67 m x 6.05 m 5.72 m x 4.40 m f3.6 m-4.9 m f 5° f 1.75 m
Focal length Number of fibers Spectral ranges
Spectral
resolution
20 m 4,000 370~900 nm 1,800
Sky coverage
Declination
-10°~ +90°
CREDITS: (FROM TOP) BY HU WEICHENG, THE SHANGHAI INSTITUTE OF APPLIED PHYSICS, CAS;
COURTESY OF THE NATIONAL ASTRONOMICAL OBSERVATORIES, CAS