Speaker
Description
On behalf of the GBAR collaboration
The GBAR (Gravitational Behavior of Antihydrogen at Rest) experiment receives particle beams from the AD/ELENA facility at CERN, the world's unique source of low-energy antiprotons.The AD/ELENA facility is also unique in its deceleration of GeV beams created using CERN proton-synchroton (PS) machine. * According to the 2023 review, the beam delivered by AD/ELENA to users now benefits from improved stability and quality. **
Unlike most of the AD experiments, GBAR uses a pulsed drift-tube scheme to electrostatically decelerate the ELENA antiproton pulses from 100 keV, to as low as 1 keV, for injection into a Penning trap for cooling and accumulation. This makes GBAR very sensitive to the emittance of the ELENA beam.
Using a uni-potential lens in a variant of the quadrupole scanning technique, we present emittance measurements of the ELENA antiproton pulses using phosphor-screen images of a multichannel-plate detector. Complementary measurements were performed with matter-analog H$^{-}$ pulses, also provided by ELENA but using a duo-plasmatron source at 100 keV. The emittances are compared to quantify differences in machine performance and to study the MCP detector response to antimatter.
Footnotes
*:Bartmann W et al. , "The ELENA
facility"2018 Phil. Trans. R. Soc. A 376:20170266.
http://dx.doi.org/10.1098/rsta.2017.0266
** L. Bojtar et al., “A review of the 2023 antiproton physics run in the CERN antimatter factory,” Proc. IPAC’24, TUPC08 (2024), doi:10.18429/JACoW-IPAC2024-TUPC08.
| In which format do you inted to submit your paper? | LaTeX |
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