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The magnetron discharge as a source of H- ions ; Magnetronski izboj kao izvor H- iona
The energy distribution of fast hydrogen atoms formed by neutralization of positive ions and subsequent backscattering at the magnetron cathode is derived from the contours of Balmer lines emitted in the direction parallel to the electric field. The effects of inelastic collisions in the discharge on the distribution function thus obtained are considered. The effective yield of H- per backscattered H atom, a, is estimated from the calculated coefficients of secondary emission8) and from the energy distribution of atoms backscattered at the cathode; a is found to be ~ 0.5 for a cesiated molybdenum surface. It is shown that the attenuation of the flux of fast H- ions generated at the magnetron cathode is mainly due to slowing down of H- by charge exchange and destruction of slow H- by charge transfer and collisional detachment in the positive column. The thermal regime of magnetron cathodes and the rate of desorption of chemisorbed cesium are considered and a scaling law is derived which relates thermal load, discharge pulse duration and increase of cathode surface temperature. ; Raspodjela energije brzih atoma vodika, nastalih neutralizacijom pozitivnih iona i refleksijom na katodi magnetrona, određena je na osnovu profila Balmerovih linija emitiranih u smjeru paralelnom sa električnim poljem. Razmatra se utjecaj neelastičnih sudara u izboju na tako dobivene funkcije raspodjele. Efektivni iscrpak H- iona po reflektiranom H atomu, a, procijenjen je na osnovu izračunatih koeficijenata sekundame emisije i raspodjele energije atoma reflektiranih na katodi; nađeno je da za molibdensku katodu prekrivenu kemisorbiranim cezijem a iznosi ~ 0.5. Dokazuje se da do atenuacije toka brzih H- iona, formiranih na magnetronskoj katodi, dolazi uglavnom zbog usporavanja H- iona u izboju usljed izmjene naboja te razaranjem sporih H- iona putem ionske rekombinacije i otcjepljenja elektro na neelastičnim sudarima. Razmatra se termički režim magnetronskog izvora i brzina desorpcije cezija sa površine Mo-katode te izvodi teorem ...
The magnetron discharge as a source of H- ions ; Magnetronski izboj kao izvor H- iona
The energy distribution of fast hydrogen atoms formed by neutralization of positive ions and subsequent backscattering at the magnetron cathode is derived from the contours of Balmer lines emitted in the direction parallel to the electric field. The effects of inelastic collisions in the discharge on the distribution function thus obtained are considered. The effective yield of H- per backscattered H atom, a, is estimated from the calculated coefficients of secondary emission8) and from the energy distribution of atoms backscattered at the cathode; a is found to be ~ 0.5 for a cesiated molybdenum surface. It is shown that the attenuation of the flux of fast H- ions generated at the magnetron cathode is mainly due to slowing down of H- by charge exchange and destruction of slow H- by charge transfer and collisional detachment in the positive column. The thermal regime of magnetron cathodes and the rate of desorption of chemisorbed cesium are considered and a scaling law is derived which relates thermal load, discharge pulse duration and increase of cathode surface temperature. ; Raspodjela energije brzih atoma vodika, nastalih neutralizacijom pozitivnih iona i refleksijom na katodi magnetrona, određena je na osnovu profila Balmerovih linija emitiranih u smjeru paralelnom sa električnim poljem. Razmatra se utjecaj neelastičnih sudara u izboju na tako dobivene funkcije raspodjele. Efektivni iscrpak H- iona po reflektiranom H atomu, a, procijenjen je na osnovu izračunatih koeficijenata sekundame emisije i raspodjele energije atoma reflektiranih na katodi; nađeno je da za molibdensku katodu prekrivenu kemisorbiranim cezijem a iznosi ~ 0.5. Dokazuje se da do atenuacije toka brzih H- iona, formiranih na magnetronskoj katodi, dolazi uglavnom zbog usporavanja H- iona u izboju usljed izmjene naboja te razaranjem sporih H- iona putem ionske rekombinacije i otcjepljenja elektro na neelastičnim sudarima. Razmatra se termički režim magnetronskog izvora i brzina desorpcije cezija sa površine Mo-katode te izvodi teorem ...
The magnetron discharge as a source of H- ions ; Magnetronski izboj kao izvor H- iona
Prelec, K. (author) / Šternberg, Z. W. (author)
1977-01-01
Fizika : a journal of experimental and theoretical physics ; ISSN 0015-3206 (Print) ; Volume 9 ; Issue 1
Article (Journal)
Electronic Resource
English , Croatian
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