1,049,124. Ion pumps. CANADIAN PATENTS & DEVELOPMENT Ltd. July 30, 1963 [Aug. 23, 1962], No. 30182/63. Heading H1D. The magnetic field producing means N, S of a magnetron-type cold-cathode sputter-ion pump partly bound the glow-discharge region 3 which is to a large extent separate from, but is in direct communication with, the pumping or sorption region 2. The envelope of the pump is formed by upper and lower polepieces 7, 8, a wall 13 of stainless steel or other non-magnetic material, a glass-to-metal seal 6, and a tubular member 11 for connection to a tubulation 19 of a system to be evacuated. Rings 9 of sheet titanium form a cathode with metal sheets 10, preferably of titanium, covering the faces of the polepieces 7, 8. A cylindrical anode 12 is supported by a rod 15. A sputter cathode 4 in the form of a cylindrical sheet or solid rod of titanium is mounted on a rod 5 extending through the seal 6. A number of permanent magnets 14 contact the polepieces 7 and 8 which are preferably of mild steel. Three assemblies as shown may be superimposed (Fig. 4, not shown) to provide a pump capable of increased pumping speeds.