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Present Status of the Vacuum System for the 7 MeV Proton Linac

Hirokazu Fujita, Makoto Inoue, Yoshihisa Iwashita, A. Noda

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Abstract

Vacuum pressure needed for beam acceleration at the ion linear accelerator has been attained and proton beam has already been successfully accelerated to 7 MeV.Evaluation of the vacuum system is performed and total Q-value is estimated to be 6.0 X 10-5 Torr•1/sec, of which leak and outgassing rate from the surface of the vessel are --4.0X10 5 Torr//sec and -2.0X10-5 Tornl/sec, respectively.From the mass spectrum of the residual gas, no peak of hydro-carbon was observed.

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Vacuum pressure needed for beam acceleration at the ion linear accelerator has been attained and proton beam has already been successfully accelerated to 7 MeV.Evaluation of the vacuum system is performed and total Q-value is estimated to be 6.0 X 10-5 Torr•1/sec, of which leak and outgassing rate from the surface of the vessel are --4.0X10 5 Torr//sec and -2.0X10-5 Tornl/sec, respectively.From the mass spectrum of the residual gas, no peak of hydro-carbon was observed.

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Available abstract

Vacuum pressure needed for beam acceleration at the ion linear accelerator has been attained and proton beam has already been successfully accelerated to 7 MeV.Evaluation of the vacuum system is performed and total Q-value is estimated to be 6.0 X 10-5 Torr•1/sec, of which leak and outgassing rate from the surface of the vessel are --4.0X10 5 Torr//sec and -2.0X10-5 Tornl/sec, respectively.From the mass spectrum of the residual gas, no peak of hydro-carbon was observed.

Key concepts: Linear particle accelerator, Proton, Physics, Nuclear physics, Nuclear engineering, Optics, Engineering, Beam (structure)

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