In this report we present state of work under development of LTD stages with air insulation in a primary circuit and vacuum insulation in a secondary turn. Special unit, named capacitor block, was developed for use as a main structural element of the transformer stages. It incorporates two capacitors GA 35426 (40 nF, 100 kV) and multichannel multigap gas switch. Two types of stages were developed: 1) Stage LTD-20 with 4 modules in parallel and 5 capacitor blocks in each module. In tests of this stage current amplitude up to 850 kA with ∼ 140 ns rise time was obtained on a 0.05 Ω load at 100 kV charging voltage. 2) Stage LTD-4 with 2 modules in parallel and 2 capacitor blocks in each module. Several installations were built on base of these stages, including linear transformer, consisting of two identical LTD-20 stages in series, and high power electron accelerator on base of LTD-4 stages. Design of installations and tests results are presented and discussed in this report.
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