The Basic Study for Atomic Hydrogen Gas

本项目旨在制备自旋极化原子氢气，并研究其物理特性。为了完成这项研究工作，必须构建(1)超导磁体的高磁场，(2)稀释低温恒温器的低温，(3)氢气解离成原子，(4)室内气体的冷凝，(5)气体密度、极化等的检测，(6)用微波将储存的气体喷射出来。现在，我们已经完成了超导磁体的高磁场。磁场被激发到6.4特斯拉，并以恒流方式驱动。其耗油率为0.59、lh和0.89。/h，分别为恒流和正流模式。稀释低温恒温器已在我院车间建成。氦-3模式的试验显示了相当好的性能，但已经明确了稀释模式操作的一些改进是必要的。改进工作已基本完成。在室温下，用射频振荡器观察了氢气的解离。制造了存放原子氢气的室，并在其中安装了辐射热计。我们现在正在测试在玻璃杜瓦瓶中放置一个小型超导磁体来探测氢原子气体。为了完成这个项目，需要进一步进行以下的研究。(1)用稀释型低温恒温器将气体冷却到几lomx。(2)原子氢气体检测方法的建立。(3)气体密度和极化的测量。(4)极化原子氢气喷射试验。

This project aims at the production of the spin polarized atomic gydrogen gas and study the physical characteristics of the gas. To perform this research work, one must construct (I) the high magnetic field by a superconductive magnet, (2) low temperature by a dilution cryostat, (3) dissociation of hydrogen gas to atoms, (4) condensation of gas in a chamber (5) detection of the gas density, polarization etc. and (6) the ejection of stored gas by microwave.Now, we have completed the high magnetic field by superconductive magnet. The magnetic field was excited up to 6.4 Tesla, and driven by constant current mode. The liq. ^4He consumption rate was 0.59, lh and 0.89. /h at constant and normal current modes, respectively. The dilution cryostat has been built at the workshop of our institute. The test by helium-3 mode showed fairly good performance, but it has been made clear that some improvements were necessary by the dilution mode operation. The improvement has been almost finished. The dissociation of hydrogen gas by RF oscillator was observed at room temperature. The chamber for the atomic hydrogen gas is made and the bolometer is installed in it. We are now testing the detection of the atomic hydrogen gas in a small superconducting magnet set in a glass dewar.In order to complete this project, the following studies should be performed further.(1) The cooling of the gas at several lomx by the dilution mode cryostat.(2) The establishment of the gas detection method for the atomic hydrogen.(3) The measurements of the gas density and polarization.(4) The test of the ejection of the polarized atomic hydrogen gas.