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Využití modelových spekter ke stanovení vhodných parametrů kapilárního výboje pro zesílenou emisi Balmerova alfa – přechodu H–like N (13,4 nm)
Štraus, Jaroslav ; Koláček, Karel ; Schmidt, Jiří ; Frolov, Oleksandr ; Prukner, Václav
Our capillary-discharge driver CAPEX-U, as many other pulsed-power devices, requires very accurate triggering of high-voltage gas switch. Laser-triggered switches offer many advantages over electrical triggered ones in terms of reproducibility, reliability, suitability for multi-gap or multi-channel operation and electrical isolation from the main high-voltage pulse. Results on the simultaneous initiation of four-channel high voltage spark gap by a neodymium dopped yttrium aluminium garnet (Nd:YAG, λ=1064 nm) laser are presented. The switch is pressurised with SF6 and N2 and holds off voltage about 500 kV at a gap separation of 13 mm. Electrical parameters of the spark channels are obtained from the comparison of experimental and modelling (equivalent circuit) results.
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MATERIALS SCIENCE BEAMLINE, ELETTRA TRIESTE - NEW INSTRUMENT FOR SURFACE SCIENCE
Vašina, R. ; Doležel, P. ; Vondráček, Martin ; Cháb, Vladimír ; Prince, K. C. ; Ressel, B.
The Materials Science Beamline is attached to a bending magnet at synchrotron Elettra Trieste, Italy. The tuning range is from 35 to 800 eV with calculated spectral resolving power E/delta E better than 4000 in the whole range. The optical elements consist of a toroidal prefocusing mirror, polarization aperture, entrance slit, plane pre-mirror, single plane grating (blazed), spherical mirror, exit slit and toroidal refocusing mirror. The plane grating is operated in the fixed focus mode with Cff = 2.4. Energy scanning is performed by rotation of the plane grating and simultaneous translation and rotation of the plane pre-mirror. In the first tests, a resolving power of at least 4000 has been achieved at energies of 400 eV. The calculated photon flux at the sample is compared with measured values. Various experimental chambers depending on experiments can be attached to the beamline (LEEM, ESCA).
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