Engineering topics

Crawford, Anthony C.

Publications and source records attributed to Crawford, Anthony C..

6 records

DOE OSTI2017

Extreme diffusion limited electropolishing of niobium radiofrequency cavities

In this study, a deeply modulated, regular, continuous, oscillating current waveform is reliably and repeatably achieved during electropolishing of niobium single-cell elliptical radiofrequency cavities. Details of the technique and cavity test results are reported here. The method is applicable for cavity frequencies in the range 500 MHz to 3.9 GHz and can be extended to multicell structures.

43 PARTICLE ACCELERATORS↗

DOE OSTI2017

Demagnetization of a Complete Superconducting Radiofrequency Cryomodule: Theory and Practice

Not Available

43 PARTICLE ACCELERATORS↗

DOE OSTI2015

Observation of Magnetic Superviscosity in Metglas 2605SA1

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 57,000 after relaxation.

43 PARTICLE ACCELERATORS↗

DOE OSTI2015

Superconducting RF Cryomodule Demagnetization

This note presents measurements that support the proposition that it is feasible to demagnetize a fully assembled superconducting RF cryomodule.

43 PARTICLE ACCELERATORS↗

DOE OSTI2014

A Study of Magnetic Shielding Performance of a Fermilab International Linear Collider Superconducting RF Cavity Cryomodule

This note presents measurements that support the conclusion that it is feasible to achieve magnetic field values at the level of 5 milliGauss for a cryomodule in a realistic and representative ambient magnetic field environment.

43 PARTICLE ACCELERATORS↗

DOE OSTI2014

A Study of Thermocurrent Induced Magnetic Fields in ILC Cavities

The case of axisymmetric ILC-type cavities with titanium helium vessels is investigated. A first-order estimate for magnetic field within the SRF current layer is presented. The induced magnetic field is found to be not more than 1.4x10 -8 Tesla = 0.14 milligauss for the case of axial symmetry. Magnetic fields due to symmetry breaking effects are discussed.

43 PARTICLE ACCELERATORS↗