Design and Testing of Cesium Atomic Concentration Detection System Based on TDLAS Author Name Affiliation Postcode lianglizhen*  Hefei Institutes of Physical Science, Chinese Academy of Sciences  230031 liushanhu  School of Science, Shandong Jianzhu University  wuyong  Anhui Jianzhu University  weijianglong  Hefei Institutes of Physical Science, Chinese Academy of Sciences  xieyahong  Hefei Institutes of Physical Science, Chinese Academy of Sciences  Abstract:       In order to better build the Neutral Beam Injector with Negative Ion Source (NNBI), the pre-research on key technologies has been carried out for the Comprehensive Research Facility for Fusion Technology (CRAFT). Cesium seeding into negative-ion sources is a prerequisite to obtain the required negative hydrogen ion. The performance of ion source largely depends on the cesium conditions in the source. It is very necessary to quantitatively measure the amount of cesium in the source during the plasma on and off periods (vacuum stage). This article uses the absorption peak of cesium atoms near 852.1nm to build a cesium atom concentration detection system based on Tunable Diode Laser Absorption Spectroscopy (TDLAS) technology. The test experiment based on the cesium cell is carried out, obtained the variation curve of cesium concentration at different temperatures. The experimental results indicate that: the system detection range is within 5×10E6-2.5×10E7 pieces/cm^3 and the system resolution better than 1×10E6 pieces/cm^3. Hits: 0 Download times: 0 National Key R&D Program of China，Comprehensive Research Facility for Fusion Technology Program of China，the HFIPS Director’s Fund，The Natural Science Foundation of Anhui Province     Download reader