Paper |
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THXSH01 |
Development of the INR Linear Accelerator DTL RF System |
191 |
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- A.I. Kvasha, V.L. Serov
RAS/INR, Moscow, Russia
- A. Feschenko
MIPT, Dolgoprudniy, Moscow Region, Russia
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The regular INR DTL RF system operation began in 1992. By this point three new type of vacuum tube, designed purposely for INR linear accelerator, were manufactured at OKB "Swetlana" in the amount sufficient for RF system operation during 20 years. Among them were two vacuum tubes for final RF power amplifier - GI-54A and RF driver - GI-51A and also vacuum tube for powerful anode modulator - GMI-44A. In the late 80s manufacture of these vacuum tubes was stopped and since 1990 designing of new vacuum tube for RF output power amplifier instead of GI-54A was started. The new vacuum tube GI-71A with output RF power up to 3 MW in pulse, plate power dissipation up to 120 kW and power gain about 10 was simpler and less expensive in comparison with GI-54A. The transition to new vacuum tube began in 1999 and finished in 2014. Successful testing of GI-57A as RF driver, fulfilled in 2008, opened the possibility of replacement GI-51A. As for GMI-44A replacement there are no analogues, produced in Russian federation, and, as it turned out, the only option was GI-71A again. Below some problems, connected with the vacuum tubes replacement, as well as main results of twenty years DTL RF system operation are considered.
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Slides THXSH01 [4.748 MB]
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TUPSA037 |
Powerfull RF Triode as Anode Modulator Vacuum Tube |
294 |
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- A.I. Kvasha, V.L. Serov
RAS/INR, Moscow, Russia
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For 20 years modulator vacuum tube GMI-44A successfully operated in DTL RF system of INR Linac. The vacuum tube had been designed and manufactured at OKB "Swetlana" in the 70s-80s of the last century. The quantity of manufactured tubes - about 80, had allowed the accelerator operating till now. Manufacture of the tubes was stopped In the mid 80s. Attempts of the GMI-44A manufacture restoration or repair were unsuccessful ones. As it turned out, the only decision in the circumstances was using of 200 MHz powerful pulse triode GI-71A as modulator tube. The vacuum tubes GI-71A were installed for the last ten years in all output RF power amplifiers (PA) of INR Linac instead of RF pulse triode GI-54A. In the paper some problems appearing after modulator vacuum tube replacement are discussed.
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