Electronic Paramagnetic Resonance Spectrometer for Nuclear Reactors

1,152,779. Electron paramagnetic resonance apparatus. COMMISSARIAT A L'ENERGIE ATOMIQUE. Aug.31, 1967 [Sept. 5, 1966], No. 39813/67. Addition to 1, 058, 562. Heading G1N. In an electron paramagnetic resonance spectrometer of the type described in Specification 1,058, 562 for studying samples being irradiated in the vicinity of the core of a nuclear swimming pool reactor, the solenoid is cooled directly by the swimming pool water of the reactor which is caused to flow through the solenoid. The solenoid may comprise two concentric coaxial windings 30, 32 on insulating cylinders 34, 36 and connected in series or parallel and separated by an insulating screen 38. The wire forming these windings is made of anodic-oxidized aluminium, needing no insulator between turns, and is of rectangular cross-section. The wire is coiled with the shorter side of its cross-section parallel to the solenoid axis except for a central part of the outer layer of winding 32 where it is coiled with the longer side of its cross-section parallel to the solenoid axis to improve the homogeneity of the magnetic field. The longitudinal position of winding 30 is adjustable by screws 40.