A new 201.25 MHz RF system is being developed for the LANSCE proton drift tube linac (DTL). A planned upgrade will replace parts of the DTL RF system with new generation components. When installed for the LANSCE-R project, the new system will reduce the total number of electron power tubes from twenty-four to seven in the RF power plant. The 3.4 MW final power amplifier will use a Thales TH628 Diacrodereg. This state- of-the-art device eliminates the large anode modulator of the present triode system, and will be driven by a new tetrode intermediate power amplifier. In this mode of operation, this intermediate stage will provide 150 kW of peak power. The first DTL tank requires up to 400 kW of RF power, which will be provided by the same tetrode driver amplifier. A prototype system is being constructed to test components, using some of the infrastructure from previous RF projects. High voltage DC power became available through innovative re-engineering of an installed system. A summary of the design and construction of the intermediate power amplifier will be presented and test results will be summarized.

Progress on new high power RF system for lansce DTL

The Los Alamos Neutron Science Center (LANSCE) is in the planning phase of a refurbishment project that will sustain reliable facility operations well into the next decade. The LANSCE accelerator was constructed in the late 1960s and early 1970s and is a national user facility that provides pulsed protons and spallation neutrons for defense and civilian research and applications. The refurbishment will focus on systems that are approaching "end of life" and systems where modern upgrades hold the promise for significant operating cost savings. The current baseline consist of replacing all the 201 MHz RF systems, upgrading a substantial fraction of the 805 MHz RF systems to high efficiency klystrons, replacing the high voltage systems, and replacing the low level RF cavity field control systems. System designs will be presented. The performance improvements will be described and the preliminary cost and schedule estimates will be discussed.

/pdf/lansce-rf-system-refurbishment-bdd018svp1.pdf

Lansce RF System Refurbishment

Trouble Shooting of Deuteron RFQ for PKUNIFTY

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 major upgrade is replacing much of the 40 year-old proton drift tube linac RF system with new components at the Los Alamos Neutron Science Center (LANSCE). When installed, the new system will reduce the total number of electron power tubes from twenty-four to eight in the RF powerplant. A new 200 MHz high power cavity amplifier has being developed at LANSCE. This 3.2 MW final power amplifier (FPA) uses a Thales TH628 Diacrode{reg_sign}, a state-of-the-art tetrode that eliminates the large anode modulator of the triode-based FPA that has been in use for four decades. Drive power for the FPA is provided by a new tetrode intermediate power amplifier (and a solid-state driver stage). The new system has sufficient duty-factor capability to allow LANSCE to return to 1 MW beam operation. Prototype RF power amplifiers have been designed, fabricated, and assembled, and are being tested. High voltage DC power became available through innovative re-engineering of an installed system. Details of the electrical and mechanical design of the FPA and ancillary systems are discussed.

Design of a new VHF RF power amplifier system for LANSCE

Long pulses of high proton current (greater than one millisecond at 17 mA) at LANSCE are limited by the duty factor (DF) of the 201.25 MHz RF system powering the 100 MeV DTL. The operating point of the existing triode final power amplifiers (FPA) is approximately 75% of the published maximum anode dissipation rating, but is at 90% of the allowable limit with a margin of safety for tuning excursions, voltage standing wave effects and electron tube manufacturing variations. A new RF power system is under development for increasing both peak power and DF. The FPA uses a Thales TH628 Diacrode  with pyrolytic-graphite grids. It doesn't require the large anode modulator of the present triode system. Lower mains power consumption and reduced water-cooling requirements are some advantages of this scheme. A TH781 tetrode is being tested as an intermediate stage, using a Thales cavity amplifier. When installed, the new system will reduce the total number of electron power tubes from twenty-four to seven for the LANSCE DTL. Aspects of the RF modeling, mechanical design, RF testing, and other system considerations will be presented.

/pdf/a-new-201-25-mhz-high-power-rf-system-for-the-lansce-dtl-2wf3etl2q7.pdf

A new 201.25 mhz high power rf system for the lansce dtl

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A new 201.25 mhz high power rf system for the lansce dtl