The goal of the ASACUSA-CUSP collaboration at the Antiproton Decelerator of CERN is to measure the ground-state hyperfine splitting of antihydrogen using an atomic spectroscopy beamline. A mileston...

/pdf/the-asacusa-antihydrogen-and-hydrogen-program-results-and-4qelcq5aco.pdf

The ASACUSA antihydrogen and hydrogen program : results and prospects

The CERN Antiproton Decelerator (AD) provides antiproton beams with a kinetic energy of 5.3MeV to an active user community. The experiments would profit from a lower beam energy, but this extractio...

https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.2017.0266

The ELENA facility

The goal of the ASACUSA-CUSP collaboration at the Antiproton Decelerator of CERN is to measure the ground-state hyperfine splitting of antihydrogen using an atomic spectroscopy beamline. A milestone was achieved in 2012 through the detection of 80 antihydrogen atoms 2.7 meters away from their production region. This was the first observation of "cold" antihydrogen atoms in a magnetic field free region. In parallel to the progress on the antihydrogen production, the spectroscopy beamline was tested with a source of hydrogen. This led to a measurement at a relative precision of 2.7x 10^(-9) which constitues the most precise measurement of the hydrogen hyperfine splitting in a beam. Further measurements with an upgraded hydrogen apparatus are motivated by CPT and Lorentz violation tests in the framework of the Standard Model Extension. Unlike for hydrogen, the antihydrogen experiment is complicated by the difficulty of synthesizing enough cold antiatoms in ground-state. The first antihydrogen quantum states scan at the entrance of the spectroscopy apparatus was realized in 2016 and is presented here. The prospects for a ppm measurement are also discussed.

The Antiproton Decelerator at the CERN Proton Synchrotron complex provides antiprotons at a kinetic energy of 5.3 Mev to several experiments. The stray radiation from antiproton annihilations is the most important radiation field for radiation protection in the Antiproton Decelerator experimental areas. In August 2018, aluminium, bismuth and indium samples have been exposed to the annihilation stray radiation. The resulting induced radioactivity has been measured and compared to the predictions of FLUKA Monte Carlo simulations. The observed agreement between the FLUKA predictions and the measured values is better than a factor of 2.

Measurements and FLUKA simulations of aluminium, bismuth and indium activation by stray radiation from the annihilation of low energy antiprotons

A base band tune (BBQ) measurement system has recently been developed at CERN based on a high- sensitivity direct-diode detection technique followed by a high resolution FFT algorithm implemented in an FPGA. The FPGA based digital processing allows the acquisition of continuous real-time spectra with 32-bit resolution, while a digital frequency synthesiser (DFS) can provide acquisition synchronised chirp excitation. All the implemented algorithms support dynamic reconfiguration of processing and excitation parameters. Results from both laboratory measurements and tests performed with beam at the CERN SPS will be presented.

The FPGA based Continuous FFT Tune Measurement System for the LHC and its Test at the CERN SPS

Extra Low ENergy Antiproton (ELENA) ring and its Transfer Lines: Design Report

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Extra Low ENergy Antiproton (ELENA) ring and its Transfer Lines: Design Report