SRF2011 - List of Authors (Vennekate, H.)

Paper

Title

Page

Second Sound Measurement for SPL Cavity Diagnostics

767

K.C. Liao, C. Balle, J. Bremer, T. Junginger, W. Vollenberg, W. Weingarten
CERN, Geneva, Switzerland
H. Vennekate
University of Göttingen, Georg-August University of Göttingen, Göttingen, Germany

Second sound is a temperature wave which travels at a speed of ≈ 20m/s in superfluid helium. The second sound detector used is a so-called oscillating superleak transducer (OST), initially provided by Cornell-CLASSE, and thereafter manufactured at CERN. It contains a flexible porous membrane for transmitting and blocking the movement of the superfluid and normal fluid components of the second sound wave. From the measured speed of this wave and by determining the travel time between the quench event and several OSTs, an alternative method is offered to localise the quench site by triangulation. Several surface mount devices (SMDs) – thick film chip resistors – are used to simulate the quench spot in a cavity. Given the heat pulse and the location of the installed OSTs, the temperature dependence of the second sound velocity is determined under different experimental conditions and compared with previous results and theoretical expectations. The second sound triangulation will eventually be used to determine quench locations on the Superconducting Proton Linac (SPL) test cavities (704MHz) at CERN.

Poster THPO026 [2.544 MB]

Paper	Title	Page
THPO026	Second Sound Measurement for SPL Cavity Diagnostics	767
	K.C. Liao, C. Balle, J. Bremer, T. Junginger, W. Vollenberg, W. Weingarten CERN, Geneva, Switzerland H. Vennekate University of Göttingen, Georg-August University of Göttingen, Göttingen, Germany
	Second sound is a temperature wave which travels at a speed of ≈ 20m/s in superfluid helium. The second sound detector used is a so-called oscillating superleak transducer (OST), initially provided by Cornell-CLASSE, and thereafter manufactured at CERN. It contains a flexible porous membrane for transmitting and blocking the movement of the superfluid and normal fluid components of the second sound wave. From the measured speed of this wave and by determining the travel time between the quench event and several OSTs, an alternative method is offered to localise the quench site by triangulation. Several surface mount devices (SMDs) – thick film chip resistors – are used to simulate the quench spot in a cavity. Given the heat pulse and the location of the installed OSTs, the temperature dependence of the second sound velocity is determined under different experimental conditions and compared with previous results and theoretical expectations. The second sound triangulation will eventually be used to determine quench locations on the Superconducting Proton Linac (SPL) test cavities (704MHz) at CERN.
	Poster THPO026 [2.544 MB]