Aerial photo of PETRA and HERA colliders

Aerial photo of PETRA and HERA colliders

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Caption: Aerial photograph showing the outlines of the PETRA & HERA colliders at DESY , the German particle physics laboratory in Hamburg. PETRA (Positron- Electron Tandem Ring Accelerator) is an electron- positron collider which has been operating since 1978; it discovered the first evidence for gluons in 1979. HERA (Hadron-Electron Ring Accelerator) is a new design of machine which will collide 820 GeV protons (which belong to the group of particles known as hadrons) with 30 GeV electrons. Its underground ring is 6. 3 km long. Currently under construction, it is scheduled to start operations in 1989-1990. Hamburg's Fuhlsbuttel airport is in the distance.

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Keywords: accelerator, collider, desy, german, germany, hadron electron ring, hamburg, hera accelerator, nuclear research, particle physics laboratory, petra accelerator, photography, photos, view

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