Properties of the WASA pellet target and a stored intermediate-energy beam

Experimental data from the pd → He 3 η reaction close to threshold have been used to investigate time-dependent properties of the WASA pellet target and the stored beam of 892.8 MeV protons in the CELSIUS accelerator. The detection of 3He ions in solid-state detectors provides an excellent almost ba...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 587; no. 2; pp. 178 - 187
Main Authors: Bargholtz, Chr, Gerén, L., Kupść, A., Laukhin, I.V., Lindberg, K., Shafigullin, R.R., Tegnér, P.-E., Zartova, I.
Format: Journal Article
Language:English
Published: Elsevier B.V 21-03-2008
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Summary:Experimental data from the pd → He 3 η reaction close to threshold have been used to investigate time-dependent properties of the WASA pellet target and the stored beam of 892.8 MeV protons in the CELSIUS accelerator. The detection of 3He ions in solid-state detectors provides an excellent almost background free trigger for η production. Pellet interactions with the surrounding material and with the beam lead to evaporation of deuterium gas into the beam pipe. Approximately 30% of the registered η decay events are due to interactions in deuterium gas outside the pellets. Due to beam–target interaction the beam is transversely heated and appears to acquire a component of a slightly lower energy.
ISSN:0168-9002
1872-9576
1872-9576
DOI:10.1016/j.nima.2007.12.040