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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Dark current measurements on a superconducting cavity using a cryogenic current comparator.

R Geithner¹, R Neubert, W Vodel

¹Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, Germany. rene.geithner@uni-jena.de

The Review of Scientific Instruments

|February 2, 2011

Summary

This study demonstrates nondestructive dark current measurements in superconducting linear accelerator cavities. A sensitive cryogenic current comparator achieved a current sensitivity of 0.2 nA/Hz(1/2) for detecting 5 nA dark currents.

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Area of Science:

High-energy physics
Accelerator science
Superconductivity

Background:

Superconducting linear accelerators are crucial for particle physics research.
Accurate measurement of dark currents is essential for accelerator performance and safety.
Existing measurement techniques can be limited in noisy environments.

Purpose of the Study:

To develop and demonstrate a nondestructive method for measuring dark currents in tera electron volt energy superconducting cavities.
To assess the feasibility of measurements in a highly noisy accelerator environment.

Main Methods:

Utilized a low-temperature direct current superconducting quantum interference device (dc SQUID) based cryogenic current comparator (CCC).
Performed measurements in an extremely noisy accelerator environment.
Achieved high current sensitivity for dark current detection.

Main Results:

Demonstrated a current sensitivity of 0.2 nA/Hz(1/2) under challenging conditions.
Successfully enabled the detection of dark currents as low as 5 nA.
Validated the nondestructive nature of the measurement technique.

Conclusions:

The developed dc SQUID-based CCC is effective for nondestructive dark current measurements in noisy accelerator settings.
This method offers a significant advancement for characterizing superconducting linear accelerators.
The technique has implications for improving the performance and reliability of future accelerators.