title: A new version of the LUPIN detector: improvements and latest experimental verification.
abstract: LUPIN-II is an upgraded version of LUPIN, a novel rem counter first developed in 2010 specifically conceived to work in pulsed neutron fields (PNFs). The new version introduces some modifications that improve the performance of the detector, in particular extending its upper detection limit in PNFs. This paper discusses the characteristics and the performance of the instrument. Measurements have been carried out in radiation fields characterized by very different conditions: the detector has first been exposed in PNFs with intensity up to 5 μSv per burst, where it could keep the H*(10) underestimation below 20% up to 500 nSv per burst. It has then been tested in operational conditions around particle accelerators, where it has shown performances similar to that of ionization chambers. Its proper functioning has also been verified in high energy mixed fields, where the experimental results matched the Monte Carlo predictions. Its neutron/photon discrimination capability has been tested in a steady-state photon field where, via an innovative technique based on a threshold set on the derivative of the current signal, it was capable of rejecting a photon H*(10) rate of about 25 mSv/h, and in a mixed neutron/photon field, where a time-based discrimination method was employed.
authors.affiliation: Department of Energy, Polytechnic of Milan, Via Ponzio 34/3, 20133 Milan, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Caresana
authors.affiliation: Department of Energy, Polytechnic of Milan, Via Ponzio 34/3, 20133 Milan, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Cassell
authors.affiliation: CNAO, Via Privata Campeggi, 27100 Pavia, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Ferrarini
authors.affiliation: Paul Scherrer Institut, 5232 Villigen, Switzerland.
authors.forename: E
authors.initials: E
authors.lastname: Hohmann
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: G P
authors.initials: GP
authors.lastname: Manessi
authors.affiliation: Paul Scherrer Institut, 5232 Villigen, Switzerland.
authors.forename: S
authors.initials: S
authors.lastname: Mayer
authors.affiliation: CERN, 1211 Geneva 23, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Silari
authors.affiliation: Department of Energy, Polytechnic of Milan, Via Ponzio 34/3, 20133 Milan, Italy.
authors.forename: V
authors.initials: V
authors.lastname: Varoli
mesh_terms: D008962:Models, Theoretical; D009502:Neutrons; D012542:Scattering, Radiation