Positron–Electron Tandem Ring Accelerator

The Positron–Electron Tandem Ring Accelerator (PETRA) is one of the particle accelerators at the German national laboratory DESY in Hamburg, Germany. At the time of its construction, it was the biggest storage ring of its kind and still is DESY's second largest synchrotron after HERA. PETRA's original purpose was research in elementary particle physics. From 1978 to 1986, it was used to study electron–positron collisions with the four experiments JADE, MARK-J, PLUTO and TASSO. The discovery of the gluon, the carrier particle of the strong nuclear force, by the TASSO collaboration in 1979 is counted as one of the biggest successes. PETRA was able to accelerate electrons and positrons to 19 GeV.

This article is about a particle accelerator. For other uses, see Petra (disambiguation).
PETRA III
PETRA III Max von Laue hall at the DESY campus in Hamburg.
General properties
Accelerator typeSynchrotron light source
Beam typeelectrons
Target typeLight source
Beam properties
Maximum energy6 GeV
Maximum brightness1021 ph./(s mm2 mrad2 0.1% BW)
Physical properties
Circumference2.304 kilometres (1.432 mi)
LocationHamburg, Germany
Coordinates53.579049°N 9.88370°E / 53.579049; 9.88370
InstitutionDESY
Dates of operation2009–present
Preceded byPETRA II

Research at PETRA led to an intensified international use of the facilities at DESY. Scientists from China, France, Israel, the Netherlands, Norway, the United Kingdom and the USA participated in the first experiments at PETRA alongside many German colleagues.

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