کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10637727 | 993989 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Low-frequency magnetic interference in a SQUID gradiometer caused by a Cryotiger® gas-mixture cooler
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
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چکیده انگلیسی
A Cryotiger® gas-mixture cooler was applied for cooling of three high-Tc SQUID magnetometers. These SQUID magnetometers were mounted on an alumina holder in an axial gradiometer configuration. From 20Â Hz upward, the system noise was about 0.1Â pT/âHz. Below this frequency, the noise gradually increased to a level of 10Â pT/âHz at 1Â Hz. This low-frequency excess noise appeared to be due to remnant magnetization of the Cryotiger cold head. Movement of magnetic cold-head parts with respect to the SQUIDs are induced by pressure fluctuations in the heat exchanger lines. By using one SQUID as a reference for the cooler noise, a first-order gradiometer can be formed in which the cooler noise is eliminated. To establish a proper second-order gradiometer either a fourth SQUID has to be added, or the spatial separation between cold head and SQUIDs has to be increased significantly.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cryogenics - Volume 45, Issue 4, April 2005, Pages 317-322
Journal: Cryogenics - Volume 45, Issue 4, April 2005, Pages 317-322
نویسندگان
A.P. Rijpma, H.J.M. ter Brake, E. de Vries, H.J. Holland, H. Rogalla,