TY - JOUR
T1 - Enhancing the extraction of laser-ionized beams from an arc discharge ion source volume
AU - Martinez Palenzuela, Y.
AU - Marsh, B.A.
AU - Ballof, J.
AU - Catherall, R.
AU - Chrysalidis, K.
AU - Cocolios, T.E.
AU - Crepieux, B.
AU - Day Goodacre, T.
AU - Fedosseev, V.N.
AU - Huyse, M.H.
AU - Larmonier, P.B.
AU - Ramos, J.P.
AU - Rothe, S.
AU - Smith, J.D.A.
AU - Stora, T.
AU - Van Duppen, P.
AU - Wilkins, S.
PY - 2018/9/15
Y1 - 2018/9/15
N2 - The Versatile Arc Discharge and Laser Ion Source (VADLIS) is a recently established ion source for the CERN-ISOLDE radioactive ion beam facility. It offers either electron-impact ionization (VADIS-mode) or resonance laser ionization (RILIS-mode). The choice of operating mode depends on the element of interest or the required beam purity. Particle-in-cell simulations using the VSim software show that the ion extraction efficiency of the VADLIS in RILIS-mode can be improved if it is equipped with an insulated extractor plate, to which an optimal voltage can be applied. This enables optimization of the RILIS-mode ion extraction independently of the electron density. Experiments have been performed using a prototype VADLIS with an adjustable extractor plate voltage for the generation of gallium ion beams at the off-line separator as well as magnesium, molybdenum and mercury ion beams at ISOLDE. A factor >2 increase of the VADLIS efficiency in RILIS-mode has been achieved.
AB - The Versatile Arc Discharge and Laser Ion Source (VADLIS) is a recently established ion source for the CERN-ISOLDE radioactive ion beam facility. It offers either electron-impact ionization (VADIS-mode) or resonance laser ionization (RILIS-mode). The choice of operating mode depends on the element of interest or the required beam purity. Particle-in-cell simulations using the VSim software show that the ion extraction efficiency of the VADLIS in RILIS-mode can be improved if it is equipped with an insulated extractor plate, to which an optimal voltage can be applied. This enables optimization of the RILIS-mode ion extraction independently of the electron density. Experiments have been performed using a prototype VADLIS with an adjustable extractor plate voltage for the generation of gallium ion beams at the off-line separator as well as magnesium, molybdenum and mercury ion beams at ISOLDE. A factor >2 increase of the VADLIS efficiency in RILIS-mode has been achieved.
KW - ion source
KW - resonance laser ionization
KW - arc discharge ionization
KW - radioactive ion beams
KW - particle-in-cell simulation
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-85049421397&partnerID=MN8TOARS
U2 - 10.1016/j.nimb.2018.06.006
DO - 10.1016/j.nimb.2018.06.006
M3 - Article
SN - 0168-583X
VL - 431
SP - 59
EP - 66
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
ER -