"0"^^ . "3"^^ . . "0"^^ . "Modelov\u00E1n\u00ED emise vysoce nabit\u00FDch iont\u016F z laserov\u00E9ho plazmatu" . . "http://www.isvav.cz/projectDetail.do?rowId=GA202/98/1274"^^ . . "Dosud jsou zn\u00E1m\u00E9 dva mechanismy transportuj\u00EDc\u00ED vysoce nabit\u00E9 ionty z laserov\u00E9ho ohniska. Oba spo\u010D\u00EDvaj\u00ED na p\u0159edstav\u011B dvouteplotn\u00EDho rozp\u00EDn\u00E1n\u00ED. Prv\u00FD je podm\u00EDn\u011Bn p\u0159\u00EDtomnost\u00ED hork\u00FDch elektron\u016F v plazmatu a hod\u00ED se na p\u0159\u00EDpad infra\u010Derven\u00FDch laser\u016F, druh\u00FD spo\u010D\u00EDv\u00E1 na p\u0159edstav\u011B dvojit\u00E9ho ohniska, kdy hork\u00E9 prim\u00E1rn\u00ED ohnisko sv\u00FDm za\u0159en\u00EDm generuje chladn\u011Bj\u0161\u00ED perifern\u00ED plazma. Oba modely dob\u0159e popisuj\u00ED zn\u00E1m\u00FD tvar kolektorov\u00FDch sign\u00E1l\u016F, kter\u00E9 se vyzna\u010Duj\u00ED n\u011Bkolika maximy a d\u00E1le spr\u00E1vn\u011B popisuj\u00ED n\u00E1bojov\u00E1 spektra pozorovan\u00E1 ve velk\u00E9 vzd\u00E1lenosti od ohniska. Z\u00E1vadou ov\u0161em je, \u017Ee v protikladu k experimentu mechanismus s hork\u00FDmi elektrony d\u00E1v\u00E1 p\u0159\u00EDli\u0161 n\u00EDzk\u00E9 hodnoty kolektorov\u00E9ho proudu. Domn\u00EDv\u00E1me se, \u017Ee nesouhlas pramen\u00ED ze semianalytick\u00E9ho charakteru zjednodu\u0161en\u00E9ho modelu, kde se po\u010D\u00E1te\u010Dn\u00ED profily hustoty p\u0159ed vlastn\u00EDm rozp\u00EDn\u00E1n\u00EDm popisuj\u00ED analytick\u00FDmi \u0159e\u0161en\u00EDmi. Podstatou n\u00E1vrhu tedy je proveden\u00ED \u00FApln\u00E9ho hydrodynamick\u00E9ho modelov\u00E1n\u00ED expanze a verifikace jeho v\u00FDsledk\u016F na z\u00E1klad\u011B experimentu." . . "Two mechanisms have been identified, which are responsible for the transport of highly charged ions from a laser focus. They are both based on a two-temperature expansion. The first one is driven by the hot electrons occurring in plasmas generateds by lasers in the infrared region, the other, more relevant for converted wavelengths, is based on the idea of a dual focus: the main focus with the hot plasma corona surrounded by a colder peripheral plasma formed due to the radiation from the primary focusBoth the models reprodukce equally well the fundamental features of the ion collector signals - multiple humps on the collector curves and an occurrence of highly charged ions in a far expansion zone. However, the hot electrons mechanism is giving too lovalues of the collector current in contrast to what is obtained experimentally. Although in the case of near infrared the hot electron mechanism has been the only plausible explanation so far of the spectral composition of the emitted ions an adequate ex"@en . . . . . . . "Modelling of highly charged ion emission from laser plasmas"@en . . "Projekt navazoval na zprovozn\u011Bn\u00ED laserov\u00E9ho syst\u00E9mu PALS. Zahrnoval teoretick\u00E9 a experiment\u00E1ln\u00ED studium expanzace laserov\u00E9ho plazmatu vytvo\u0159en\u00E9ho laserov\u00FDm impulsem na masivn\u00EDm ter\u010D\u00EDku. V r\u00E1mci projektu byly prov\u00E1d\u011Bny experimenty tak\u00E9 na spolupracuj\u00EDc\u00EDch"@cs . . . . "GA202/98/1274" . . "1"^^ . "3"^^ .