ASACUSA experiment

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

Atomic Spectroscopy and Collisions Using Slow Antiprotons (ASACUSA), AD-3, is an experiment at the Antiproton Decelerator (AD) at CERN. The experiment was proposed in 1997, started collecting data in 2002 by using the antiprotons beams from the AD, and will continue in future under the AD and ELENA decelerator facility.

ASACUSA physics[]

ASACUSA collaboration is testing for CPT-symmetry by laser spectroscopy of antiprotonic helium and microwave spectroscopy of the hyperfine structure of antihydrogen. It compares the matter and antimatter using antihydrogen and antiprotonic helium and looks into the matter-antimatter collisions.^[1]^[2] It also measures atomic and nuclear cross-sections of antiprotons on various targets at extremely low energies.^[3]

Experimental setup[]

ASACUSA receives antiproton beams from the AD and ELENA decelerator. These beams are decelerated to 0.01 MeV energy using a radiofrequency decelerator and the antiprotons are stored in the MUSASHI traps. The positrons to form antihydrogen atoms are obtained from ${\ce {Na^{22}}}$ radioactive source and stored in a positron accumulator. The mixing of antiprotons and positrons forms polarised and cold antihydrogen inside a double-Cusp trap. The polarised antihydrogen atoms from this system then enter the spectrometer where the measurements are done.^[4]

ASACUSA team at beam setup preparation in September 2018

ASACUSA collaboration[]

Ulmer Fundamental Symmetries Laboratory, RIKEN, Japan
University of Brescia
Polytechnic University of Milan, Italy
Hiroshima University, Japan
Max-Planck-Institut für Quantenoptik, Germany
Nishina Center for Accelerator-Based Science, RIKEN, Japan
University of Tokyo, Japan
University of Milan, Italy
Experimental Physics Department, CERN, Switzerland
University of Insubria
Tokyo University of Science, Japan
Aarhus University, Denmark

ASACUSA team preparing beam setup for the ELENA beams in September 2018.

References[]

^ "ASACUSA – General". Retrieved 21 December 2016.
^ "Archived copy" (PDF). Archived from the original (PDF) on 13 December 2013. Retrieved 9 February 2011.{{cite web}}: CS1 maint: archived copy as title (link)
^ "Archived copy". Archived from the original on 15 April 2013. Retrieved 17 February 2010.{{cite web}}: CS1 maint: archived copy as title (link)
^ Amsler, C.; Barna, D.; Breuker, H.; Chesnevskaya, S.; Costantini, G.; Ferragut, R.; Giammarchi, M.; Gligorova, A.; Higaki, H. (2021). Status report of the ASACUSA experiment - progress in 2020 and plans for 2021. Status Report. CERN. Geneva. SPS and PS Experiments Committee, SPSC.

External Links[]

Record for ASACUSA experiment on INSPIRE-HEP

[1] "ASACUSA – General". Retrieved 21 December 2016.

[2] "Archived copy" (PDF). Archived from the original (PDF) on 13 December 2013. Retrieved 9 February 2011.{{cite web}}: CS1 maint: archived copy as title (link)

[3] "Archived copy". Archived from the original on 15 April 2013. Retrieved 17 February 2010.{{cite web}}: CS1 maint: archived copy as title (link)

[4] Amsler, C.; Barna, D.; Breuker, H.; Chesnevskaya, S.; Costantini, G.; Ferragut, R.; Giammarchi, M.; Gligorova, A.; Higaki, H. (2021). Status report of the ASACUSA experiment - progress in 2020 and plans for 2021. Status Report. CERN. Geneva. SPS and PS Experiments Committee, SPSC.

[1]

[2]

[3]

[4]