H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
H01J25/34—Travelling-wave tubes; Tubes in which a travelling wave is simulated at spaced gaps
H01J25/36—Tubes in which an electron stream interacts with a wave travelling along a delay line or equivalent sequence of impedance elements, and without magnet system producing an H-field crossing the E-field
H01J25/38—Tubes in which an electron stream interacts with a wave travelling along a delay line or equivalent sequence of impedance elements, and without magnet system producing an H-field crossing the E-field the forward travelling wave being utilised
Antenne electromagnetique et antenne d'excitation pour un appareil de resonance magnetique nucleaire munie d'une telle antenne electromagnetique
Procede de caracterisation de materiaux pour leur utilisation en magnetometrie a resonance, spectrometre pour cette caracterisation et procede de calibration de ce spectrometre
Cellule d'absorption destinee a recevoir un gaz ou une vapeur rarefie, utilisable pour la stabilisation en frequence d'un oscillateur electrique et la spectrometrie