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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Remote coupling between a probe and a superconducting klystron cavity for use in gravitational wave detectors

Full text
Author(s):
de Paula, L. A. N. [1] ; Aguiar, O. D. [2] ; Oliveira, Jr., N. F. [1]
Total Authors: 3
Affiliation:
[1] Univ Sao Paulo, Dept Mech & Mat Phys, Sao Paulo - Brazil
[2] Natl Inst Space Res, Astrophys Div, Sao Jose Dos Campos - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Journal of Instrumentation; v. 8, AUG 2013.
Web of Science Citations: 7
Abstract

In this work the main task was to measure the remote coupling between a probe and some niobium superconducting reentrant cavities for use in parametric transducers of gravitational wave detectors. The cavities were manufactured from RRR300 niobium and cryogenically tested to determine the electromagnetic coupling among other parameters. These cavities were also closed using a RRR300 niobium cover forming a narrow axial gap with the post top. A hole was made at the base opposite the cover in order to the probe reach the cavity. Generally, the critical coupling (beta approximate to 1) is achieved with the probe inside the cavity. The mechanical connection of the probe with the transducer and the external circuit introduces an unwanted seismic noise in the transducer. The microstrip antennas have been traditionally employed to make a wireless connection. However, this study has demonstrated coupling factor beta approximate to 1 with the probe moved away 4.0 mm from the cavity with a 3.0 mm diameter hole. Couplings with the probe moved away 1.0 mm and 7.0 mm from cavities with 1.5 mm and 3.5 mm diameter holes, respectively, have also been obtained. These results have revealed the influence of the hole diameter with the remote coupling between an electric field probe and the klystron mode of a superconducting reentrant cavity. Due to the practicalities, this effect may replace the microstrip antennas making it possible to implement high sensitivity parametric transducers. (AU)

FAPESP's process: 98/13468-9 - The Schenberg detector: proposal for the project, construction, and operation of a 0.6-meter diameter spherical gravitational wave detector
Grantee:Odylio Denys de Aguiar
Support Opportunities: Regular Research Grants
FAPESP's process: 06/56041-3 - New physics from space: gravitational waves
Grantee:Odylio Denys de Aguiar
Support Opportunities: Research Projects - Thematic Grants