Abstract
Oscillating Superleak Transducers (OSTs) can be used to localize quenches of superconducting radio-frequency cavities. Local hot spots at the cavity surface initiate temperature waves in the surrounding superfluid helium that acts as cooling fluid at typical temperatures in the range of 1.6 K to 2 K. The temperature wave is characterised by the properties of superfluid helium such as the second sound velocity. For high heat load densities second sound velocities greater than the standard literature values are observed. This fast propagation has been verified in dedicated small scale experiments. Resistors were used to simulate the quench spots under controlled conditions. The three dimensional propagation of second sound is linked to OST signals. The aim of this study is to improve the understanding of the OST signal especially the incident angle dependency. The characterised OSTs are used as a tool for quench localisation on a real size cavity. Their sensitivity as well as the time resolution was proven to be superior to temperature sensors glued to the surface of the cavity.
Highlights
In accelerators like the Large Hadron Collider (LHC) at CERN superconducting cavities are used to accelerate charged particles by means of an alternating electromagnetic field
The quality factor provides information on the dissipated power that is converted into heat, which the cooling system needs to extract
Heat fluxes in the kW/cm2 range can occur at the cavity surface during a quench
Summary
This content has been downloaded from IOPscience. Please scroll down to see the full text. 101 012164 (http://iopscience.iop.org/1757-899X/101/1/012164) View the table of contents for this issue, or go to the journal homepage for more. Download details: IP Address: 188.184.3.56 This content was downloaded on 14/04/2016 at 10:33 Please note that terms and conditions apply
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