A new 201.25 MHz final power amplifier (FPA) has been designed, fabricated, and tested at Los Alamos Neutron Science Center (LANSCE). The prototype FPA has produced 3 MW peak and 250 kW of mean power with ~15 dB of power gain and >65% efficiency. It has been tested for several thousand hours with a water load. A Thales TH628 Diacrode® electron tube is key to the performance of the new amplifier. It is configured with a full wavelength output circuit, having the lower main tuner situated 3⁄4λ from the central electron beam region in the tube and the upper slave tuner 1⁄4λ from the same point. The FPA is designed with input and output transmission line cavity circuits, grid decoupling circuits, an adjustable output coupler, DC blocking and RF bypassing capacitors, HOM suppressors, and a cooling system. A pair of production amplifiers are planned to be power-combined for up to 3.6 MW peak power at high duty factor. Three of these combined amplifiers will be installed in place of the original 1968-vintage amplifiers to return LANSCE operation to 12% duty factor with higher peak beam current than presently possible.

Design , test and implementation of new 201 . 25 mhz rf power amplifier for the lansce linac

A new test facility was designed and constructed at Los Alamos Neutron Science Center (LANSCE) for testing a new Thales TH628 Diacrode final power amplifier and associated driver stages. Anode power requirements for the TH628 are 29 kV DC, with 160 A in millisecond pulses, supplied by a 225 uF capacitor bank with a crowbar circuit to rapidly discharge 88 kJ of stored energy. Charging current was obtained by re-configuring a 2 MW beam power supply remaining from another project. The power tubes are operated with DC anode voltage, and beam pulsing is done with control grid bias switching at relatively low power. A new Fast Protect and Monitor System was designed to take samples of RF reflected power, anode HV, and various tube currents, with logic outputs to promptly remove high voltages, RF drive and beam pulsing during faults. The entire test system is controlled with a programmable logic controller through an operator GUI, for normal startup sequencing and protection against loss of cooling.. This test facility has been used over the past year to test the amplifiers along with high power coaxial components such as hybrid couplers and various water loads.

A high power test facility for new 201.25 mhz power amplifiers and components

Shifts in proton beam tuning were observed in the DTL portion of the Los Alamos Neutron Science Center (LANSCE) Accelerator corresponding with cooling system obstructions during the 2003 operational cycle. A diagnostic system was developed to measure longitudinal field changes at the operational field levels to confirm the source of the tune shifts and track the effectiveness of cooling system repairs. This paper describes the diagnostic system and the results of field distribution measurements at high RF power in the accelerating structures.

/pdf/lansce-dtl-longitudinal-field-measurements-at-high-power-9qwj7bawkg.pdf

Lansce dtl longitudinal field measurements at high- power*

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A high power test facility for new 201.25 mhz power amplifiers and components

Lansce dtl longitudinal field measurements at high- power*