Title :
High stabilization of DC-current source on the basis of atomic magnetic resonance in helium-4 [for proton gyromagnetic ratio measurement]
Author :
Shifrin, V.Ya. ; Park, P.G. ; Khorev, V.N. ; Kim, K.-T. ; Song, Y.S. ; Lee, S.K.
Author_Institution :
Mendeleyev Inst. for Metrol., St. Petersburg, Russia
Abstract :
An atomic magnetic resonance based current source has been developed for a new measurement of the proton gyromagnetic ratio in low field. The high-stability current source is realized by the application of more precise magnetic-field-to-frequency converter. We used the method of /sup 4/He metastable spin polarization through optical pumping of Cs atoms, and also a newly designed two-layer solenoid for the purpose. The drift of current is less than 0.1 ppm/h and its random standard deviation is 0.05 ppm.
Keywords :
constant current sources; electric current control; gyromagnetic ratio; helium neutral atoms; magnetometers; measurement standards; nuclear magnetic resonance; optical pumping; units (measurement); /sup 4/He metastable spin polarization; DC-current source; He; atomic magnetic resonance; automatic current control; controlled current shunt; high-stability current source; low current drift; low field; magnetometer; optical pumping; precise magnetic-field-to-frequency converter; proton gyromagnetic ratio measurement; two-layer solenoid; Atomic measurements; Current measurement; Gyromagnetism; Helium; Magnetic field measurement; Magnetic resonance; Metastasis; Optical polarization; Optical pumping; Protons;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 2000 Conference on
Conference_Location :
Sydney, NSW, Australia
Print_ISBN :
0-7803-5744-2
DOI :
10.1109/CPEM.2000.851029
