| Title |
Validation of Local Magnetic Shielding for FRIB Using a Prototype Cryomodule |
| Authors |
- S.K. Chandrasekaran, K. Saito
FRIB, East Lansing, Michigan, USA
|
| Abstract |
The local magnetic shield design and cryogenic magnetic shielding material for the FRIB QWR cryomodule was validated in a two cavity, one solenoid prototype cryomodule. The magnetic fields were measured inside and outside the magnetic shielding before, during, and after operation of an 8 T superconducting solenoid. The effect of demagnetization cycles of the solenoid was also examined. The magnetic field at the cavity’s high RF magnetic field area, inside the magnetic shield and with the solenoid off, was measured using a single-axis fluxgate to be less than 0.3 μT (3 mG) after cool down of the cryomodule. A 3.07 μT (30.7 mG) residual field was observed at high magnetic field area after conclusion of solenoid operation. This was attributed to the persistent currents circulating in the superconducting solenoid. Demagnetization cycles were therefore determined to be unnecessary for FRIB cryomodules, as long as the solenoid is normal conducting when the cavity is cooled through the superconducting critical temperature.
|
| Footnotes & References |
S.K. Chandrasekaran currently at Fermi National Accelerator Laboratory, Batavia, IL, USA. |
| Funding |
Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661, and the U.S. National Science Foundation under Grant No. PHY-1102511. |
| Paper |
download TUPB102.PDF [0.946 MB / 4 pages] |
| Conference |
SRF2015, Whistler, BC, Canada |
| Series |
International Conference on RF Superconductivity (17th) |
| Proceedings |
Link to full SRF2015 Proccedings |
| Session |
Poster Session |
| Date |
15-Sep-15 14:30–17:40 |
| Main Classification |
SRF Technology - Cryomodule |
| Keywords |
solenoid, cavity, operation, shielding, cryomodule |
| Publisher |
JACoW, Geneva, Switzerland |
| Editors |
Robert E. Laxdal (TRIUMF, Vancouver, BC, Canada); Jana Thomson (TRIUMF, Vancouver, BC, Canada); Volker RW Schaa (GSI, Darmstadt, Germany) |
| ISBN |
978-3-95450-178-6 |
| Published |
December 2015 |
| Copyright |
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