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The China Spallation Neutron Source is an accelerator-based neutron source, operated by the Institute of High Energy Physics, under construction at
The China Spallation Neutron Source is an accelerator-based neutron source, operated by the Institute of High Energy Physics, under construction at Dongguan
Dongguan,; pinyin: alternately romanized via Cantonese as Tungkun, is a prefecture-level city in central Guangdong Province, China. An important industrial city in the Pearl River Delta, Dongguan borders the provincial capital of Guangzhou t ...
in Guangdong province
) means "wide" or "vast", and has been associated with the region since the creation of Guang Prefecture in AD 226. The name "''Guang''" ultimately came from Guangxin ( zh, labels=no, first=t, t= , s=广信), an outpost established in Han dynasty ...
- the first major scientific facility in south China. The project was approved by Chinese central government in 2005. Construction began 20 October 2011, with commissioning planned for 2016, and operation in 2018.
The source contains a proton synchrotron fed by a linear accelerator; short (<500ns) pulses of 1.6 GeV protons are extracted from the synchrotron 25 times a second; these pulses strike a tungsten-metal target (cooled with heavy water
Heavy water (deuterium oxide, , ) is a form of water (molecule), water in which hydrogen atoms are all deuterium ( or D, also known as ''heavy hydrogen'') rather than the common hydrogen-1 isotope (, also called ''protium'') that makes up most o ...
) to produce energetic neutrons, which are reduced to scientifically interesting energies by a variety of moderators.
The intended budget for the project is 1.5 billion CNY;http://accelconf.web.cern.ch/AccelConf/a07/PAPERS/WEZMA02.PDF this limits the initial power of the machine to about 120 kW, but it has been designed so that its power can readily be quadrupled if more funding becomes available, by upgrading the linear accelerator and the RF components of the synchrotron.
See also
* Biological small-angle scattering *European Spallation Source
The European Spallation Source ERIC (ESS) is a multi-disciplinary research facility currently under construction in Lund, Sweden. Its Data Management and Software Centre (DMSC) is co-located with DTU in Lyngby, Denmark. Its 13 European contr ...
* Inelastic neutron scattering
Neutron scattering, the irregular dispersal of free neutrons by matter, can refer to either the naturally occurring physical process itself or to the man-made experimental techniques that use the natural process for investigating materials. Th ...
* J-PARC
* Neutron diffraction
Neutron diffraction or elastic neutron scattering is the application of neutron scattering to the determination of the atomic and/or magnetic structure of a material. A sample to be examined is placed in a beam of Neutron temperature, thermal or ...
* Neutron spin echo
* Protein dynamics
In molecular biology, proteins are generally thought to adopt unique structures determined by their amino acid sequences. However, proteins are not strictly static objects, but rather populate ensembles of (sometimes similar) conformations. Tran ...
* Soft matter
Soft matter or soft condensed matter is a type of matter that can be deformed or structurally altered by thermal or mechanical stress which is of similar magnitude to thermal fluctuations.
The science of soft matter is a subfield of condensed ...
* Spallation Neutron Source
* Spin echo
In magnetic resonance, a spin echo or Hahn echo is the refocusing of spin magnetisation by a pulse of resonant electromagnetic radiation. Modern nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) make use of this effect.
The ...
References