Laser-driven source of spin-polarized atomic hydrogen and deuterium
| Autor: | D. K. Toporkov, R. J. Holt, K. P. Coulter, M. Poelker, R.S. Kowalczyk, B. Zeidman, Linda Young, C. E. Jones |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Nuclear and High Energy Physics Hydrogen Physics::Optics chemistry.chemical_element Polarization (waves) Alkali metal Laser Magnetic field Volumetric flow rate law.invention Optical pumping Deuterium chemistry law Physics::Atomic and Molecular Clusters Physics::Atomic Physics Atomic physics Instrumentation |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 364:58-69 |
| ISSN: | 0168-9002 |
| Popis: | A laser-driven source of spin-polarized hydrogen (H) and deuterium (D) that relies on the technique of optical pumping spin exchange has been constructed. In this source, H or D atoms and potassium atoms flow continuously through a drifilm-coated spin-exchange cell where potassium atoms are optically pumped with circularly-polarized laser light in a high magnetic field. The H or D atoms become polarized through spin-exchange collisions with polarized potassium atoms. High electron polarization ( ≈ 80%) has been measured for H and D atoms at flow rates ≈ 2 × 1017 atoms/s. Lower polarization values are measured for flow rates exceeding 1 × 1018 atoms/s. In this paper, we describe the performance of the laser-driven source as a function of H and D atomic flow rate, magnetic field strength, alkali density and pump-laser power. Polarization measurements as a function of flow rate and magnetic field suggest that, despite a high magnetic field, atoms within the optical-pumping spin-exchange apparatus evolve to spin-temperature equilibrium which results in direct polarization of the H and D nuclei. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect