CERN Accelerating science

Published Articles
Report number	CERN-ACC-2015-240
Title	Propagation of Radioactive Contaminants Along the Isolde Beamline
Author(s)	Kersevan, Roberto (CERN) ; Ady, Marton (CERN) ; Dorsival, Alexandre (CERN) ; Gottberg, Alexandre (TRIUMF) ; Maietta, Maddalena (CERN) ; Vandoni, Giovanna (CERN)
Publication	2015
Number of pages	4
In:	6th International Particle Accelerator Conference, Richmond, VA, USA, 3 - 8 May 2015, pp.WEPHA009
Subject category	Accelerators and Storage Rings
Accelerator/Facility, Experiment	CERN ISOLDE
Abstract	The vacuum system of RIB facilities is entirely hermetical, with storage of effluents and controlled release to atmosphere after a decay time. In Isolde, distributed primary pumping is sectorized in three parts, but all effluents are conveyed together in a unique tank. Thus, highly contaminated gas from the target and front end may be mixed with less contaminated gas from the beam transfer lines. This study aims at analysing and quantifying the distribution and propagation of neutral rare gas radioactive isotopes along the Isolde beam-line by numerical simulation (steady-state and time resolved Test-Particle Monte-Carlo, Molflow+) and experimental means. The time-resolved Monte-Carlo integrates decay time for the propagating species. To measure the distribution of contaminants, sampling filters are installed at the exhaust of the vacuum turbo-molecular pumps. Comparison between simulation and experiment shows excellent agreement, confirming the pertinence of the Monte-Carlo tool to radioactive species propagation. The filtering effect of magnetic sectors, the RFQ Cooler, and Buncher on the propagating neutral isotopes are quantified.
Copyright/License	publication: © 2015-2025 The Author(s) (License: CC-BY-3.0)

Corresponding record in: Inspire