Simple concepts for ion source improvement

Nucleogenic 36Cl, 236U and 239Pu in uranium ores

“…Details have, however, changed significantly. Beam currents of typically 10lA of 35 Cl À are obtained from a modified high-intensity (NEC 32-sample MC-SNICS) ion source [14,15]. Chlorine ions are stripped at a terminal voltage of 14 MV in a recirculating gas-stripper [16] and the 7 + charge state selected by the analysing magnet.…”

Ion Source Development at Kccams, University of California, Irvine

“…This shift is required because as Cs currents in sputter sources increase, space charge moves the Cs beam waist (focus) back several mm further from the ionizer (Southon and Iyer 1990;Brown et al 2000). In the NEC source, the Cs focus voltage can be varied to alter the position of the waist, but as Hausladen et al (2002) have pointed out, when the "focus" lens is run at high voltages, it actually defocuses the Cs, pushing the waist back even further. If the lens is run at sufficiently low voltages, the waist can indeed be moved closer to the ionizer.…”

Ion Beam Emittance for an Ion Source with a Conical Hot Cavity

“…The crucial part is that an ioniser is usually made of refractory metal and heated to a very high working temperature (∼ 2500 K or more) either by electron bombardment or ohmically [11,12]. The most popular form is a semi-opened tube but the spherical cavities are also applied in some designs [13,14]. It should be mentioned that in the ISOL facilities the ioniser is either connected to a target by a kind of transfer line [13,15] or the specially designed ioniser could be simultaneously the irradiated target where new isotopes are produced and then released into the ioniser cavity [16].…”