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A 3.9 GHz deflecting mode (pi, TM110) cavity has been long used forsix-dimensional phase-space beam manipulation tests at the A0 Photo-InjectorLab (16 MeV) in Fermilab and their extended applications with vacuumcryomodules are currently planned at the Advanced Superconducting TestAccelerator (ASTA) user facility (> 50 MeV). Despite the successful testresults, the cavity, however, demonstrated limited RF performance during liquidnitrogen (LN2) ambient operation that was inferior to theoretical prediction.We have been performing full analysis of the designed cavity by analyticcalculation and comprehensive system simulation analysis to solve complexthermodynamics and mechanical stresses. The re-assembled cryomodule iscurrently under the test with a 50 kW klystron at the Fermilab A0 beamline,which will benchmark the modeling analysis. The test result will be used todesign vacuum cryomodules for the 3.9 GHz deflecting mode cavity that will beemployed at the ASTA facility for beam diagnostics and phase-space control.

High Power Test Of A 3.9 GHz 5-cell Deflecting-mode Cavity In A Cryogenic Operation