Features

• Interchangeable detector chambers
• Variety of cryostat configurations
• Field changeable
• Ship without Dewar

Description

CANBERRA's Convertible Cryostat bridges the gap between the dipstick cryostat, in which the Dewar and detector chamber are seperate and the integral cryostat, in which the detector chamber and Dewar share a common vacuum. The Convertible Cryostat consists of a sealed detector chamber which can be attached to a dipstick cryostat or to an integral cryostat of the user's choice - and the configuration may be changed in the field without special tools or special skills. Detector chambers, which are compact and light weight, may be shipped or hand-carried with ease for use in remote locations.

The CANBERRA Convertible Cryostat makes use of seperate vacuum systems plus a low-loss coupling which allows the detector chamber to be connected to a Dewar or to a dipstick. The Dewar, which must operate at low pressure in order to minimize the LN₂ loss rate, is factory sealed. The detector chamber, which protects the detector element from the environment, is factory sealed. The key to the system is a low loss coupling between the Dewar and detector chamber. This coupling, which is of small volume, is designed to minimize the heat load due to convection, conduction and radiation, thereby reducing LN₂ losses to a minimum.

In order to change configurations, one need only to warm up the system, remove the detector chamber from one cryostat and attach it to another. No pumping or baking of system components is required and neither the Dewar nor the detector chamber id opened to atmosphere at any time.

Convertible Cryostats ara available in a variety similar to that of conventional units and the overall dimensions are almost the same. Consult the cryostat specification sheets for information on the types and sizes that are available. Convertible Cryostats lend themselves to special configurations and arrays as individual detectors can be installed and serviced independently. Consult the factory for advice on specific problems or products.

End cap dimensions depend on detector sizes. The chart below shows the typical efficiency range vs. end-cap diameter. End cap lengths are also greater for larger detectors. Consult the factory if end-cap size is critical in your application.