Having no moving parts in the cold, the pulse tube cold finger has a very low vibration and magnetic noise. Combined with a flexure compressor from the LSF range, the pulse tube cooler has no wearing parts and therefore offers an extremely long lifetime.

Introduction

Pulse Tube Cryocoolers are specially developed for applications where the object to be cooled is extremely sensitive to vibrations. The absence of moving parts in the pulse tube cold head diminishes the influence of most of the disturbances at the cooler-detector interface. The pulse tube cryocooler produces and sustains a detector operating temperature of 80 K.

The combination of a cold head with no moving parts and the reliable moving magnet flexure bearing compressor guarantees the high reliability of this cooler type.

With its specific characteristics, the LPT cryocoolers are very suitable for applications requiring extremely low levels of induced vibration, acoustic noise, and electromagnetic interference.

Comparable in layout to the "split" configuration Stirling-cycle coolers, the pulse tube cryocooler is a sealed device, with the compressor and cold finger constructed as separate components and connected by a malleable metal transfer line. This configuration enhances the flexibility in system design and helps to isolate the sensitive detector even more from compressor-induced vibration or EMI.

Design Features

• dual opposed pistons driven by linear motors minimise compressor vibration and acoustic noise
• compact magnetic circuit optimised for motor efficiency and reduction of electromagnetic interference (EMI).
• pulse tube cold head with no moving parts suitable to directly mount highly sensitive detectors.
• moving magnet flexure bearing design eliminates possible causes of performance degradation.
• no maintenance is required.