title: An inductively heated hot cavity catcher laser ion source.
abstract: An inductively heated hot cavity catcher has been constructed for the production of low-energy ion beams of exotic, neutron-deficient Ag isotopes. A proof-of-principle experiment has been realized by implanting primary (107)Ag(21+) ions from a heavy-ion cyclotron into a graphite catcher. A variable-thickness nickel foil was used to degrade the energy of the primary beam in order to mimic the implantation depth expected from the heavy-ion fusion-evaporation recoils of N = Z (94)Ag. Following implantation, the silver atoms diffused out of the graphite and effused into the catcher cavity and transfer tube, where they were resonantly laser ionized using a three-step excitation and ionization scheme. Following mass separation, the ions were identified by scanning the frequency of the first resonant excitation step while recording the ion count rate. Ion release time profiles were measured for different implantation depths and cavity temperatures with the mean delay time varying from 10 to 600 ms. In addition, the diffusion coefficients for silver in graphite were measured for temperatures of 1470 K, 1630 K, and 1720 K, from which an activation energy of 3.2 ± 0.3 eV could be determined.
authors.affiliation: Nuclear Physics Group, School of Physics and Astronomy, Schuster Laboratory, The University of Manchester, Brunswick Street, Manchester M13 9PL, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Reponen
authors.affiliation: Department of Physics, University of Jyväskylä, Survontie 9, FI-40014 Jyväskylä, Finland.
authors.forename: I D
authors.initials: ID
authors.lastname: Moore
authors.affiliation: Department of Physics, University of Jyväskylä, Survontie 9, FI-40014 Jyväskylä, Finland.
authors.forename: I
authors.initials: I
authors.lastname: Pohjalainen
authors.affiliation: CERN, CH-1211, Geneva 23, Switzerland.
authors.forename: S
authors.initials: S
authors.lastname: Rothe
authors.affiliation: Department of Physics, University of Jyväskylä, Survontie 9, FI-40014 Jyväskylä, Finland.
authors.forename: M
authors.initials: M
authors.lastname: Savonen
authors.affiliation: Department of Quantum Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan.
authors.forename: V
authors.initials: V
authors.lastname: Sonnenschein
authors.affiliation: Department of Physics, University of Jyväskylä, Survontie 9, FI-40014 Jyväskylä, Finland.
authors.forename: A
authors.initials: A
authors.lastname: Voss