| Autor: |
C. Heiden, K. Klundt, R. Landgraf, M. Mück, Guenter Thummes |
| Rok vydání: |
1997 |
| Předmět: |
|
| DOI: |
10.1016/b978-008042688-4/50066-1 |
| Popis: |
Publisher Summary To test the applicability of a pulse tube refrigerator (PTR) for low-noise cooling, this chapter constructs a coaxial doubleinlet PTR designed for operation of a high-Tc SQUID gradiometer which consists of two YBCO RF-SQUIDs. It is designed for cooling a YBCO RF-SQUID gradiometer. Reduction of interference signals from the pressure-wave generating rotary valve is accomplished by connecting the refrigerator inlets and the rotary valve via a long flexible tube. The cooler has been successfully employed to operate the gradiometer without any magnetic shielding. As a remaining source of weak periodic interference signals at the cold head, pressure-wave induced vibrations of the sensors in an ambient magnetic field can be identified. Corresponding improvements of the cooler are shown to give a still better performance of the SQUID gradiometer. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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