{"created":"2023-05-15T14:58:29.378957+00:00","id":79352,"links":{},"metadata":{"_buckets":{"deposit":"e83d5b2f-2e03-4317-a306-4dcb44a60741"},"_deposit":{"created_by":1,"id":"79352","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"79352"},"status":"published"},"_oai":{"id":"oai:repo.qst.go.jp:00079352","sets":["10:29"]},"author_link":["850405","850406","850404","850401","850403","850402"],"item_10005_date_7":{"attribute_name":"発表年月日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2019-11-06","subitem_date_issued_type":"Issued"}]},"item_10005_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"X-ray laser is applied to many scientific and engineering fields such as X-ray microscope, X-ray photoelectron spectroscopy, X-ray lithography, and X-ray holography. Because the plasma-excited X-ray laser is driven by the stimulated emission phenomenon of multiply-charged ions in laser generated plasmas, a driver laser system with an extremely high output energy was necessary. Therefore, the development of a compact and high-repetition X-ray laser, which can be operated and maintained even in a university laboratory, has been carried out. As major lasing scheme of the X-ray laser, there are two methods, that is, transient collisional excitation scheme and recombination plasma scheme. In the recombination plasma scheme that we focus on, a relatively light element is ionized by laser irradiation onto the metal or gas target and high-temperature and high-density plasma is generated. When the hot, dense plasma is rapidly cooled due to an adiabatic expansion, a non-equilibrium plasma is created, where a three-body recombination process dominate over the other processes. Subsequently, the electron captured into highly-excited states are subjected to collisional deexcitation, resulting in the transition into lower states. Consequently, a population inversion between lower levels is generated. \nThe groups of RIKEN and Toyoda Institute of Technology have adopted the recombination plasma scheme and observed the soft X-ray amplification (Li-like Al 3d-4f, 15.5nm) in a high-density Al plasma generated by 16 pulse trains of Nd:YAG laser system. In this study, the similar recombination plasma scheme was employed and lasing experiments were conducted for optimization of laser oscillation on Li-like Al soft X-ray laser. The pumping laser system was a compact Nd:YAG laser (pulse width: 10 ps or 100 ps, pulse interval: 200 ps, total output energy: 2 J for 10 ps laser, 3 J for 100-ps laser, 16 pulse trains), line focusing onto the Al target by a prism array. The laser intensity was 3×10^(11)-1×10^(12) W/cm^2 (focusing size: 0.05 mm×11 mm). Soft X-rays from the laser plasma was measured by a grazing incident spectrometer with a flat field grating. In the experiments,the gain coefficient estimated by the 100-ps laser pulse trains (lasing transition: Li-like 3d-4f 15.5 nm). The gain coefficients obtained are g=8.6 cm-1 and 5.5 cm-1, which is much higher than the value obtained by the previous experiment (g~3.2). \n Also, we measured the gain coefficient for 10-ps laser pulse train. The optimal laser pulse duration will be discussed in detail. \n","subitem_description_type":"Abstract"}]},"item_10005_description_6":{"attribute_name":"会議概要（会議名, 開催地, 会期, 主催者等）","attribute_value_mlt":[{"subitem_description":"3rd Asia-Pacific Conference on Plasma Physics","subitem_description_type":"Other"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"metadata only access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_14cb"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Wang, J."}],"nameIdentifiers":[{"nameIdentifier":"850401","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Murakami, K."}],"nameIdentifiers":[{"nameIdentifier":"850402","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"R. Shinmori"}],"nameIdentifiers":[{"nameIdentifier":"850403","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Kishimoto, Maki"}],"nameIdentifiers":[{"nameIdentifier":"850404","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Namba, S."}],"nameIdentifiers":[{"nameIdentifier":"850405","nameIdentifierScheme":"WEKO"}]},{"creatorNames":[{"creatorName":"Kishimoto, Maki","creatorNameLang":"en"}],"nameIdentifiers":[{"nameIdentifier":"850406","nameIdentifierScheme":"WEKO"}]}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"conference object","resourceuri":"http://purl.org/coar/resource_type/c_c94f"}]},"item_title":"Lithium-like aluminum ion recombination plasma X-ray laser at 15.5 nm","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Lithium-like aluminum ion recombination plasma X-ray laser at 15.5 nm"}]},"item_type_id":"10005","owner":"1","path":["29"],"pubdate":{"attribute_name":"公開日","attribute_value":"2020-03-12"},"publish_date":"2020-03-12","publish_status":"0","recid":"79352","relation_version_is_last":true,"title":["Lithium-like aluminum ion recombination plasma X-ray laser at 15.5 nm"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-05-15T22:30:10.781388+00:00"}