The Performance of 1.3 Ghz 9-Cell Superconducting Cavity Systems for The TESLA Test Facility
For the Tesla Test Facility (TTF)1’2 a new infrastructure has been established at DESY to prepare and test superconducting cavities. It consists of automised chemistry, large clean room facilities, high-vacuum furnace, high pressure water rinsing system and vertical as well as horizontal test stands. A 5 MW klystron is available for High Power Processing on cavities and for coupler conditioning. The design goal for the gradient is Eacc> 15 MV/m at a quality factor of Q > 3–109 with the cavities operated in pulsed mode (800 jlxs constant gradient with 10 Hz repetition rate). More than 20 cavities fabricated by different companies were measured vertically. The majority of them exceeded the specification. Several cavities reached 25 MV/m at Q > M010 in cw mode and up to 30 MV/m in pulsed mode. Eight cavities were tested in the horizontal cryostat fully equipped with helium vessel, high power coupler, HOM-couplers and tuning system. The superconducting capture cavity was installed and tested in the linac in Jan. ‘97. In addition a module consisting of 8 cavities has been installed recently and the first beam has been accelerated. Test results like gradient, quality factor and their limitations as well as the performance of the first cryomodule are presented.
KeywordsPulse Length Pulse Mode High Pressure Water Feed Forward Compensation Vertical Test
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