245 citations · 700 across the 19 of their papers we have counts for
8 papers · 1 filter
Observation of Magnetic Superviscosity in Metglas 2605SA1
Anthony C. Crawford
A quasi time constant for magnetic domain relaxation of Metglas 20605SA1 has been measured to be 2.6 hours. The effective relative magnetic permeability has been measured to be 57,…
Hydrogen in the LCLS2 Beamline Vacuum
Anthony C. Crawford
This note demonstrates that the cold segments of the LCLS2 linac will cryopump hydrogen for long periods of time, mitigating concerns for beam-residual gas interactions.
Modeling of Mechanical Overlap Joints in Magnetic Shields
Anthony C. Crawford
This study determines a useful value to use for the gap width of mechanical overlap joints in models of magnetic shielding. The average value of 0.1 mm is found to agree with measu…
Efficient expulsion of magnetic flux in superconducting RF cavities for high applications
S. Posen, A. Grassellino, A. Romanenko +5
Even when cooled through its transition temperature in the presence of an external magnetic field, a superconductor can expel nearly all external magnetic flux. This Letter present…
In Situ Cryomodule Demagnetization
Anthony C. Crawford
The feasibility of in-situ demagnetization of fully assembled superconducting RF cryomodules is demonstrated. Useful parametric values for demagnetization as well as measured effec…
Cooling Dynamics Through Transition Temperature of Niobium SRF Cavities Captured by Temperature Mapping
M. Martinello, A. Romanenko, M. Checchin +4
Cool-down dynamics of superconducting accelerating cavities became particularly important for obtaining very high quality factors in SRF cavities. Previous studies proved that when…
Superconducting RF Cryomodule Demagnetization
Anthony C. Crawford
This note presents measurements that support the proposition that it is feasible to demagnetize a fully assembled superconducting RF cryomodule.
Magnetic Flux Dynamics in Horizontally Cooled Superconducting Cavities
M. Martinello, M. Checchin, A. Grassellino +4
Previous studies on magnetic flux expulsion as a function of cooling details have been performed for superconducting niobium cavities with the cavity beam axis placed parallel resp…