General information
Organisation
The French Alternative Energies and Atomic Energy Commission (CEA) is a key player in research, development and innovation in four main areas :
• defence and security,
• nuclear energy (fission and fusion),
• technological research for industry,
• fundamental research in the physical sciences and life sciences.
Drawing on its widely acknowledged expertise, and thanks to its 16000 technicians, engineers, researchers and staff, the CEA actively participates in collaborative projects with a large number of academic and industrial partners.
The CEA is established in ten centers spread throughout France
Reference
SL-DRF-24-0746
Direction
DRF
Thesis topic details
Category
Corpuscular physics and outer space
Thesis topics
Optimisation of the Gbar experiment for the production of antihydrogen ions
Contract
Thèse
Job description
The aim of the Gbar experiment (Gravitational Behavior of Antihydrogen at Rest) at CERN is to produce a large number of antihydrogen atoms to measure their acceleration in Earth's gravitational field. The principle relies on the production of antihydrogen ions through two successive charge exchange reactions that occur when a beam of antiprotons passes through a positronium cloud. In 2022, Gbar demonstrated its operational scheme by producing antihydrogen atoms through the first charge exchange reaction. The current focus is on optimizing and improving various elements of the experiment to achieve the production of anti-H+, particularly the positron line leading to the creation of the positronium cloud. The challenge is to increase the number of positrons trapped in the second electromagnetic trap of the line, and then to transport them efficiently to the reaction chamber where they are converted into positronium.
The thesis work will involve operating, diagnosing, and optimizing the two electromagnetic traps of the line, as well as the positron acceleration and focusing devices to yield a sufficient number of positroniums and then the production of antihydrogen ions. The student will also participate in the measurement campaign for studying the mater counterpart of the second charge exchange reaction, relying upon a beam of H- ion instead of the beam of antiprotons.
University / doctoral school
PHENIICS (PHENIICS)
Paris-Saclay
Thesis topic location
Site
Saclay
Requester
Position start date
01/10/2024
Person to be contacted by the applicant
TUCHMING Boris boris.tuchming@cea.fr
CEA
DRF/IRFU
Irfu/SPP
CEA/Saclay
91128 Gif-sur-Yvette Cedex
0169089778
Tutor / Responsible thesis director
TUCHMING Boris boris.tuchming@cea.fr
CEA
DRF/IRFU
Irfu/SPP
CEA/Saclay
91128 Gif-sur-Yvette Cedex
0169089778
En savoir plus
https://irfu.cea.fr/Pisp/boris.tuchming/
https://irfu.cea.fr/dphp/Phocea/Vie_des_labos/Ast/ast.php?t=fait_marquant&id_ast=5149