Talk:Positron–Electron Tandem Ring Accelerator

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Comment: Stub extension. Comparison and partial merger with the information from the DESY main article. The second paragraph in this stub is replaced by the more informative text about PETRA II and PETRA III in the DESY main article.

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This article is about Physics. For other uses, see Petra (disambiguation). 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. Research at PETRA leadled 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. PETRA II In 1990, the facility was taken into operation again under the name PETRA II as a pre-accelerator for protons and electrons/positrons for the new particle accelerator HERA. In March 1995, PETRA II was equipped with undulators to create greater amounts of synchrotron radiation with higher energies, especially in the X-ray part of the spectrum. PETRA II served the Hamburg Synchrotron Radiation Laboratory (HASYLAB) at DESY as a source of high-energy synchrotron radiation in three test experimental areas. In PETRA II, positrons were accelerated to up to 12 GeV. PETRA III Max von Laue hall at the DESY campus in Hamburg. PETRA III PETRA III is the third incarnation for the PETRA storage ring, serving a regular user programme as one of the most brilliant storage-ring-based X-ray sources worldwide since 2009. The accelerator produces a particle energy of 6 GeV. There are currently three experimental halls (named after various famous scientists). The largest, named Max von Laue Hall, has a concrete floor over 300 m long that was poured as a single piece in order to limit vibrations. PETRA III delivers hard X-ray beams of very high brilliance to over 40 experimental stations. References Further reading P. Söding (2010). "On the discovery of the gluon" (PDF). European Physical Journal H. 35 (1): 3–28. Bibcode:2010EPJH...35....3S. doi:10.1140/epjh/e2010-00002-5. External links PETRA III website DESY website Category:Particle physics facilities Category:Gluons Category:Buildings and structures in Altona, Hamburg Category:Synchrotron radiation facilities Category:Particle accelerators

Redactrice at DESY (talk) 12:38, 26 August 2022 (UTC)

 Done —Quondum 15:07, 11 June 2023 (UTC)

Any comments or questions?

Just wondering whether there were any comments of questions for the edits proposed above. If not I'll implement them during the course of next week. Redactrice at DESY (talk) 09:27, 1 September 2022 (UTC)

Edit published

The edits proposed above were published on 7 September. They extend the stub, compare and and partially merge the article with the information from the DESY main article. The second paragraph in this stub is replaced by the more informative text about PETRA II and PETRA III in the DESY main article. Redactrice at DESY (talk) 12:38, 7 September 2022 (UTC)