Positron accumulation in the GBAR experiment

We present a description of the GBAR positron (<math display="inline" id="d1e1537" altimg="si3.svg"><msup><mrow><mi mathvariant="normal">e</mi></mrow><mrow><mo>+</mo></mrow></msup></math>)...

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Detalles Bibliográficos
Autores principales: Blumer, P., Charlton, M., Chung, M., Clade, P., Comini, P., Crivelli, P., Dalkarov, O., Debu, P., Dodd, L., Douillet, A., Guellati, S., Hervieux, P. -A, Hilico, L., Husson, A., Indelicato, P., Janka, G., Jonsell, S., Karr, J.-P., Kim, B.H., Kim, E.S., Kim, S.K., Ko, Y., Kosinski, T., Kuroda, N., Latacz, B.M., Lee, B., Lee, H., Lee, J., Leitee, A.M.M., Leveque, K., Lim, E., Liszkay, L., Lotrus, P., Lunney, D., Manfredi, G., Mansoulie, B., Matusiak, M., Mornacchi, G., Nesvizhevsky, V., Nez, F., Niang, S., Nishi, R., Ohayon, B., Park, K., Paul, N., Perez, P., Procureur, S., Radics, B., Regenfus, C., Reymond, J.-M., Reynaud, S., Rousse, J.-Y., Rousselle, O., Rubbia, A., Rzadkiewicl, J., Sacquin, Y., Schmidt-Kaler, F., Staszczak, M., Szymczyk, K., Tanaka, T., Tuchming, B., Vallage, B., Voronin, A., van der Werf, D.P., Wolf, S., Won, D., Wronka, S., Yamazaki, Y., Yoo, K.H., Yzombard, P., Baker, C.J.
Lenguaje:eng
Publicado: 2022
Materias:
physics.plasm-ph
Other Fields of Physics
Acceso en línea:https://dx.doi.org/10.1016/j.nima.2022.167263
http://cds.cern.ch/record/2809336
Descripción
Sumario:We present a description of the GBAR positron (<math display="inline" id="d1e1537" altimg="si3.svg"><msup><mrow><mi mathvariant="normal">e</mi></mrow><mrow><mo>+</mo></mrow></msup></math>) trapping apparatus, which consists of a three stage Buffer Gas Trap (BGT) followed by a High Field Penning Trap (HFT), and discuss its performance. The overall goal of the GBAR experiment is to measure the acceleration of the neutral antihydrogen (<math display="inline" id="d1e1548" altimg="si4.svg"><mover accent="false" class="mml-overline"><mrow><mi mathvariant="normal">H</mi></mrow><mo accent="true">¯</mo></mover></math>) atom in the terrestrial gravitational field by neutralising a positive antihydrogen ion (<math display="inline" id="d1e1559" altimg="si5.svg"><mrow><mover accent="false" class="mml-overline"><mrow><mi mathvariant="normal">H</mi></mrow><mo accent="true">¯</mo></mover><msup><mrow><mspace width="0.16667em"/></mrow><mrow><mo>+</mo></mrow></msup></mrow></math>), which has been cooled to a low temperature, and observing the subsequent <math display="inline" id="d1e1575" altimg="si4.svg"><mover accent="false" class="mml-overline"><mrow><mi mathvariant="normal">H</mi></mrow><mo accent="true">¯</mo></mover></math> annihilation following free fall. To produce one <math display="inline" id="d1e1584" altimg="si5.svg"><mrow><mover accent="false" class="mml-overline"><mrow><mi mathvariant="normal">H</mi></mrow><mo accent="true">¯</mo></mover><msup><mrow><mspace width="0.16667em"/></mrow><mrow><mo>+</mo></mrow></msup></mrow></math> ion, about <math display="inline" id="d1e1600" altimg="si8.svg"><mrow><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>10</mn></mrow></msup></mrow></math> positrons, efficiently converted into positronium (Ps), together with about <math display="inline" id="d1e1614" altimg="si9.svg"><mrow><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>7</mn></mrow></msup></mrow></math> antiprotons (<math display="inline" id="d1e1628" altimg="si10.svg"><mover accent="false" class="mml-overline"><mrow><mi mathvariant="normal">p</mi></mrow><mo accent="true">¯</mo></mover></math>), are required. The positrons, produced from an electron linac-based system, are accumulated first in the BGT whereafter they are stacked in the ultra-high vacuum HFT, where we have been able to trap 1.4(2) <math display="inline" id="d1e1637" altimg="si11.svg"><mo>×</mo></math> 10<sup loc="post">9</sup> positrons in 1100 s.

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