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      Multivariate optimization of a high brightness dc gun photoinjector

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          New photoelectric injector design for the Los Alamos National Laboratory XUV FEL accelerator

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            Sustained Kilowatt Lasing in a Free-Electron Laser with Same-Cell Energy Recovery

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              The Superconducting TESLA Cavities

              B Aune (2000)
              The conceptional design of the proposed linear electron-positron collider TESLA is based on 9-cell 1.3 GHz superconducting niobium cavities with an accelerating gradient of Eacc >= 25 MV/m at a quality factor Q0 > 5E+9. The design goal for the cavities of the TESLA Test Facility (TTF) linac was set to the more moderate value of Eacc >= 15 MV/m. In a first series of 27 industrially produced TTF cavities the average gradient at Q0 = 5E+9 was measured to be 20.1 +- 6.2 MV/m, excluding a few cavities suffering from serious fabrication or material defects. In the second production of 24 TTF cavities additional quality control measures were introduced, in particular an eddy-current scan to eliminate niobium sheets with foreign material inclusions and stringent prescriptions for carrying out the electron-beam welds. The average gradient of these cavities at Q0 = 5E+9 amounts to 25.0 +- 3.2 MV/m with the exception of one cavity suffering from a weld defect. Hence only a moderate improvement in production and preparation techniques will be needed to meet the ambitious TESLA goal with an adequate safety margin. In this paper we present a detailed description of the design, fabrication and preparation of the TESLA Test Facility cavities and their associated components and report on cavity performance in test cryostats and with electron beam in the TTF linac. The ongoing R&D towards higher gradients is briefly addressed.
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                Author and article information

                Journal
                PRABFM
                Physical Review Special Topics - Accelerators and Beams
                Phys. Rev. ST Accel. Beams
                American Physical Society (APS)
                1098-4402
                March 2005
                March 2005
                : 8
                : 3
                Article
                10.1103/PhysRevSTAB.8.034202
                ebf17258-b88a-4b54-99f6-e0dea97f0cb4
                © 2005

                http://creativecommons.org/licenses/by/3.0/

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