title: Radiation protection aspects of a 4 MW target.
abstract: The CERN Superconducting Proton Linac (SPL) is expected to provide a 2.2 GeV, 4 MW proton beam to feed facilities such as, for example, a neutrino factory or a neutrino superbeam. Material activation in such facilities is an important aspect that has to be taken into account at an early stage in designing it. In particular, the choice of the target has consequences on the induced radioactivity and dose rates in the target station and its surroundings. In the present work, the radiological aspects of a stationary target made up of tantalum pellets are compared with those of a free-surface jet of mercury. An estimation of the hadronic inelastic interactions and the production of residual nuclei in the target, the two concentric magnetic horns, the decay tunnel, the surrounding rock and a downstream dump were performed for both targets using the Monte Carlo code FLUKA. The aim was to assess the dose-equivalent rate that is to be expected during maintenance work and to evaluate the amount of residual radioactivity, which will have to be disposed of after the facility has ceased operation. The problem of after-heat in the tantalum target and the consequences of raising the proton beam energy from 2.2 to 4 GeV were also investigated.
authors.affiliation: Politecnico di Milano, CESNEF, Via Ponzio 34/3, 20133 Milan, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Agosteo
authors.forename: M
authors.initials: M
authors.lastname: Magistris
authors.forename: M
authors.initials: M
authors.lastname: Silari
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004307:Dose-Response Relationship, Radiation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005160:Facility Design and Construction / Q000379:methods*; D008962:Models, Theoretical; D009502:Neutrons; D016273:Occupational Exposure / Q000032:analysis*; D010315:Particle Accelerators / Q000295:instrumentation*; D011522:Protons; D011829:Radiation Dosage; D011834:Radiation Monitoring / Q000379:methods*; D011835:Radiation Protection / Q000295:instrumentation* / Q000379:methods; D018570:Risk Assessment / Q000379:methods*; D012307:Risk Factors; D014875:Water Pollutants, Radioactive / Q000032:analysis*
chemical_list: D011522:Protons; D014875:Water Pollutants, Radioactive