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| TUPCH140 |
Studies of Thermal Fatigue Caused by Pulsed RF Heating
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1343 |
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- S.V. Kuzikov, Yu. Danilov, N.S. Ginzburg, N.Yu. Peskov, M.I. Petelin, A. Sergeev, A.A. Vikharev, N.I. Zaitsev
IAP/RAS, Nizhny Novgorod
- A.V. Elzhov, A. Kaminsky, O.S. Kozlov, E.A. Perelstein, S. Sedykh, A.P. Sergeev
JINR, Dubna, Moscow Region
- I. Syratchev
CERN, Geneva
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A future linear collider with a multi-TeV level of energies of the collided particles in the center of masses is naturally associated with high frequencies and a high power RF level. One of the interfering factors in this way is an effect of copper damage due to multi-pulse mechanical stress caused by high-power microwaves. In order to get new information about this effect, we started an experiment with the test cavity fed by 30 GHz FEM oscillator (15-30 MW, 100-200 ns, 0.5 - 1 Hz). Now we finished the second phase of this experiment where the test cavity was irradiated by 0.1 millions of RF pulses with temperature rise ~140 C in each pulse. The third phase is the experiment with 1 million pulses. In the next planned experiment with 36 GHz magnetron (0.1-0.15 MW, 1-2 mks, 0.01 - 1 kHz) we are going to investigate the thermal fatigue in most interesting for collider application region of temperatures (30-50 C). It is expected that these two experiments will supply necessary statistical information for the developed theory of the thermal fatigue in order to extrapolate lifetime numbers to other values of the temperature rise and pulse duration.
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| TUPCH164 |
Ka-band Test Facility for High-gradient Accelerator R&D
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1408 |
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- M.A. LaPointe, J.L. Hirshfield, E.V. Kozyrev
Yale University, Physics Department, New Haven, CT
- A.A. Bogdashov, A.V. Chirkov, G.G. Denisov, A.S. Fix, D.A. Lukovnikov, V.I. Malygin, Yu.V. Rodin, M.Y. Shmelyov
IAP/RAS, Nizhny Novgorod
- S.V. Kuzikov, A.G. Litvak, O.A. Nezhevenko, M.I. Petelin, A.A. Vikharev, V.P. Yakovlev
Omega-P, Inc., New Haven, Connecticut
- G.V. Serdobintsev
BINP SB RAS, Novosibirsk
- S.V. Shchelkunov
Columbia University, New York
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Achievement of high acceleration gradients in room-temperature structures requires basic studies of electric and magnetic RF field limits at surfaces of conductors and dielectrics. Facilities for such studies at 11.4 GHz have been in use at KEK and SLAC; facilities for studies at 17.1 GHz are being developed at MIT and UMd; and studies at 30 GHz are being conducted at CERN using the CLIC drive beam to generate short intense RF pulses. Longer pulse studies at 34 GHz are to be carried out at a new test facility being established at the Yale Beam Physics Laboratory, built around the Yale/Omega-P 34-GHz magnicon. This high-power amplifier, together with an available ensemble of components, should enable tests to be carried at up to about 9 MW in 1 mcs wide pulses at up to four output stations or, using a power combiner, at up to about 35 MW in 1 mcs wide pulses at a single station. RF pulse compression is planned to be used to produce 100-200 MW, 100 ns pulses; or GW-level, 1 mcs wide pulses in a resonant ring. A number of experiments have been prepared to utilize multi-MW 34-GHz power for accelerator R&D, and users for future experiments are encouraged to express their interest.
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