Abstract
Abstract 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.
Highlights
The CERN Antiproton Decelerator (AD) facility began operation in 1999 to serve experiments for studies of CPT invariance by precision laser and microwave spectroscopy of antihydrogen and antiprotonic helium atoms
In the AD experimental areas, the antiprotons hit components resulting in their annihilation. These interactions produce stray radiation [3], which is the main radiation source of interest for radiation protection in the AD experimental areas, as it might lead to the exposure of persons and activate material
This study aims to benchmark the description of activation due to the stray radiation from the annihilation of low-energy antiprotons by the FLUKA code via activation measurements of samples that have been exposed to this stray radiation
Summary
The CERN Antiproton Decelerator (AD) facility began operation in 1999 to serve experiments for studies of CPT invariance by precision laser and microwave spectroscopy of antihydrogen and antiprotonic helium atoms. The AD provides low-energetic antiprotons to several experiments located in the CERN AD hall. A collimator located downstream the magnetic horn allows reducing the shower towards the AD hall as well as the absorbed dose received by the machine equipment. A magnetic ‘‘dogleg’’, composed by a set of bending dipoles and quadrupoles, allows the application of a momentum selection of ± 3% around the momentum mean value of 3.57 GeV∕c, for which the injection into the AD ring is designed [4]. The antiprotons are transferred to the AD ring, where they are decelerated to a kinetic energy of 5.3 MeV using both stochastic and electron cooling [5]. After deceleration, they are ejected to the AD experimental areas
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