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A variable input coupler has been designed for the Fermilab vertical cavity test facility (VCTF), a facility for testing bare 1.3 GHz 9-cell superconducting radiofrequency (SRF) cavities at 2 K, to provide some flexibility in the test stand measurements. The variable coupler allows the cavity to be critically coupled for all tests, including all TM010 passband modes, which will simplify or make possible...
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