Extra Low Energy Antiproton ring

Antiproton decelerator
(AD)
ELENA	Extra low energy antiproton ring – further decelerates antiprotons coming from AD
AD experiments
ATHENA	AD-1 Antihydrogen production and precision experiments
ATRAP	AD-2 Cold antihydrogen for precise laser spectroscopy
ASACUSA	AD-3 Atomic spectroscopy and collisions with antiprotons
ACE	AD-4 Antiproton cell experiment
ALPHA	AD-5 Antihydrogen laser physics apparatus
AEgIS	AD-6 Antihydrogen experiment gravity interferometry spectroscopy
GBAR	AD-7 Gravitational behaviour of anti-hydrogen at rest
BASE	AD-8 Baryon antibaryon symmetry experiment
PUMA	AD-9 Antiproton unstable matter annihilation

Extra Low ENergy Antiproton ring (ELENA) is a 30 m hexagonal storage ring that decelerates antiproton beams and delivers it to different AD experiments. It is situated inside the Antiproton Decelerator (AD) complex at CERN, Geneva.^[1]^[2] It is designed to further decelerate the antiproton beam coming from the Antiproton decelerator to an energy of 0.1 MeV for more precise measurements.^[3]^[4] The first beam circulated ELENA on 18 November 2016.^[5] The ring is expected to be fully operational by the end of the Long Shutdown 2 (LS2) in 2021.

GBAR experiment (AD-7) was the first experiment to use a beam from ELENA, with the rest of the AD experiments following suit after LS2 when beam transfer lines from ELENA will have been laid to all the experiments using the facility.^[6] Long Shutdown 2 (LS2) officially ended on July 5, 2022 with the beginning of LHC Run 3.^[7] Antiprotons from ELENA have been available to the MUSASHI trap of the ASACUSA CUSP experiment from August 2021.^[8]

^ "ELENA – Home".
^ Oelert, W. (2015). "The ELENA Project at CERN". Acta Physica Polonica B. 46 (1): 181. arXiv:1501.05728. Bibcode:2015AcPPB..46..181O. doi:10.5506/APhysPolB.46.181. S2CID 119270123.
^ Jorgensen, L V; Nosych, A; Sanchez-Quesada, J; Harasimowicz, J; LeGodec, G; Angoletta, M E; Kuchler, D; Zickler, T; Eriksson, T; Capatina, O; Dobers, T (2014). "Extra Low ENergy Antiproton (ELENA) ring and its Transfer Lines: Design Report". doi:10.5170/CERN-2014-002. {{cite journal}}: Cite journal requires |journal= (help)
^ Madsen, N. (2018). "Antiproton physics in the ELENA era". Phil. Trans. R. Soc. A. 376 (2116): 20170278. Bibcode:2018RSPTA.37670278M. doi:10.1098/rsta.2017.0278. PMC 5829179. PMID 29459419.
^ "A new ring to slow down antimatter – CERN". Retrieved 21 December 2016.
^ "Exceptionally slow antiprotons". CERN. Retrieved 2020-02-28.
^ "LHC Run 3 Begins!". Facebook. Retrieved 30 July 2022.
^ "PROGRESS REPORT OF THE ASACUSA AD-3 COLLABORATION" (PDF). Archived (PDF) from the original on 7 July 2022. Retrieved 30 July 2022.

[:5-1] "ELENA – Home".

[auto-2] Oelert, W. (2015). "The ELENA Project at CERN". Acta Physica Polonica B. 46 (1): 181. arXiv:1501.05728. Bibcode:2015AcPPB..46..181O. doi:10.5506/APhysPolB.46.181. S2CID 119270123.

[3] Jorgensen, L V; Nosych, A; Sanchez-Quesada, J; Harasimowicz, J; LeGodec, G; Angoletta, M E; Kuchler, D; Zickler, T; Eriksson, T; Capatina, O; Dobers, T (2014). "Extra Low ENergy Antiproton (ELENA) ring and its Transfer Lines: Design Report". doi:10.5170/CERN-2014-002. {{cite journal}}: Cite journal requires |journal= (help)

[4] Madsen, N. (2018). "Antiproton physics in the ELENA era". Phil. Trans. R. Soc. A. 376 (2116): 20170278. Bibcode:2018RSPTA.37670278M. doi:10.1098/rsta.2017.0278. PMC 5829179. PMID 29459419.

[5] "A new ring to slow down antimatter – CERN". Retrieved 21 December 2016.

[6] "Exceptionally slow antiprotons". CERN. Retrieved 2020-02-28.

[7] "LHC Run 3 Begins!". Facebook. Retrieved 30 July 2022.

[ASACUSAPROG2022-8] "PROGRESS REPORT OF THE ASACUSA AD-3 COLLABORATION" (PDF). Archived (PDF) from the original on 7 July 2022. Retrieved 30 July 2022.

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