Accession Number : AD0439218


Title :   A 550-MEGAWATT PULSE MODULATOR,


Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C


Personal Author(s) : Kitchen ,J P ; DePackh ,D C ; Roess ,H R D ; O'Connell,T J


Report Date : 10 Apr 1964


Pagination or Media Count : 11


Abstract : This development of a 1000-ampere electron gun made a modulator necessary to supply pulse power to the gun. The stringent requirements imposed on the pulse characteristics by the gun preclude a run-of-the-mill type of modulator. These requirements are: peak voltage in excess of 500 kv, flat top less than one microsecond in length with a flatness of 1% for at least 150 ns, and a rise and fall time less than one microsecond. A modulator was developed and tested which meets or exceeds these requirements. An 0.5 microfarad capacitor and an 0.3 microfarad capacitor, each built up of silvered Mylar sheets, are contained in a hermetically sealed tank and form part of a two-section network. The housing of a triggered spark gap acts as a low-impedance transmission line to connect across to another hermetically sealed tank containing a transformer having on it a flange for attachment of the gun. The transformer has a single-turn primary and a 31turn secondary. The leakage inductance of the transformer and its leads, which has to be small, is 0.12 microhenries. To match properly with this, the inductance of the 0.5 microfarad plus its connection to the 0.3 microfarad capacitor is held below .06 microhenries. The pulse repetition rate is one per second. (Author)


Descriptors :   *MODULATORS , ELECTRON GUNS , PULSE MODULATION , ELECTRICAL IMPEDANCE , POWER SUPPLIES , TIME , CAPACITORS , HERMETIC SEALS , DISCHARGE TUBES , TRANSFORMERS , INDUCTANCE , IMPEDANCE MATCHING , POWER , PULSE GENERATORS


Distribution Statement : APPROVED FOR PUBLIC RELEASE