R&D ERL: 5 Cell 704 MHz SRF Cavity Page: 6 of 8
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safety concerns the coarse tuner adjustment was limited to 100 kHz of tuning range, which is still
more than adequate for our prototype ERL operation.
Following the cryomodule construction the unit was moved to the ERL facility and positioned
under the liquid helium ballast tank, designed to provide operational liquid helium at 2 Kelvin.
Figure 3 shows the cavity installed in the blockhouse and attached to the related helium and
vacuum vent lines. Due to the fact that a liquid helium refrigerator was not part of the original
plan the cryomodule was designed with the aforementioned ballast tank. For operations the
system is filled with LHe and then a liquid ring pump is used to reduce the pressure over the
helium bath and provide stable operation at 2K.
II
Figure 3. The cryomodule and liquid helium ballast tank installed in the ERL blockhouse.
FUNDAMENTAL POWER COUPLER RE-CONDITIONING
Once the cryomodule installation was completed the commissioning tasks began. One of the
first items addressed was the re-conditioning of the FPC. The FPC was originally conditioned 2
years prior to it's insertion into the hermetic string on a resonant waveguide box with the help of
ORNL. Due to the amount of time between the original conditioning and the ERL
commissioning it was decided that it may prudent to re-condition the FPC prior to operation.
This task was carried out at room temperature to conserve liquid helium in the event the
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Burrill, A. R&D ERL: 5 Cell 704 MHz SRF Cavity, report, January 1, 2010; United States. (https://digital.library.unt.edu/ark:/67531/metadc830437/m1/6/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.