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High Temperature Interfaces

  • 800 K
  • 450 K
800K High Temperature Interface

This interface allows the cryocooler to operate up to 800 K, except as indicated in low power coolers such as the DE-202 with a 50 Hz power supply. The maximum and minimum temperature ratings of the cryocoolers are shown in the table below.

The 800 K interface design includes a thermal impedance which acts as a thermal isolator at very high temperature and very low temperature (below 8 K). So it is not recommended for use with 4 K systems. It will increase the sample temperature by approximately 1 K at no load for a 4 K cooler.

It is mechanically fragile and must be treated with care during sample installation. The 800 K interface is only supplied with ARS cryocoolers.

At 800 K most sensors—including platinum and thermocouples—will anneal and the calibration will change from time to time. The annealing is a function of the cooldown and heat-up rate. The accuracy at the low temperature (4 to 30 K) is affected, as the response curve (dmV/dT) is generally flatter at this section of the curve.

Standard system

The 800 K interface includes the following:

  • 800 K interface with 50 ohm cartridge heater.
  • High temperature safety cut off (heater circuit).
  • T/C (E-Type) for control in the range 4 K to 800 K.
    Accuracy ~2 K-3 K.
  • Silicon diode diagnostic sensor for re-calibration capability of T/Cs.
  • Temperature controller with dual sensor and dual T/C capability.
  • Platinum sensor for accurate sample temperature reading between 70 K and 800 K.
Temperature Ramp Rates

Using a CS-202 with 800 K interface, the following rates were obtained:

Cool down (initial) ................. 300 K to 10 K < 50 minutes
Heat up .................................... 10 K to 700 K < 10 minutes
Cool down (subsequent) ..... 700 K to 10 K < 70 minutes 

Construction and Specifications

Cartridge heater = 0.2 Gauss at 1 cm and 0.02 G at 2 cm.
OFHC copper C-101 alloy.
Stainless steel 304.
Stainless steel 8-18.
Vacuum level achieved: 5E-11 Torr. (Aarhus Univ.)
Not electrically isolating.
700 K in lower cooling power coolers.
Mechanically fragile due to sapphire construction. Exercise caution when using with heavy loads or high torsional or cantilevered forces.

The 450 K interface is fitted with a sapphire switch and stainless steel brace to keep it robust.  It is not electrically isolating. The silicon diode sensors maintain their accuracy after repeated cycling.

The 450 K interface design includes a thermal impedance which acts as a thermal isolator at very high and very low temperature (below 8 K).  So this interface is not recommended for use with 4 K systems.  It will increase the sample temperature by approximately 0.5 K at no load for a 4 K cooler. A heat load of 0.5 watts on the sample will raise the sample temperature by 2 K.

In the high cooling power systems this interface can be pushed up to 500 K for short periods of time (a few hours).

Standard System

The 450K interface includes the following:

  • 450K interface
  • Silicon diode for control in the range of 2 K to 450 K.
  • Silicon diode for accurate sample temperature monitoring in the range of 2 K to 450 K. Model DT-670A.SD (Accuracy +/- 0.25 K from 1.5 K to 100 K; 0.5 K from 100 K to 450 K.).
  • Thermofoil heater for control.
  • Controller with dual channel capability.
Temperature Ramp Rates

Using a CS-202 with 450 K interface, the following rates were obtained:

Cool down (initial) .................... 300 K to 10 K < 50 minutes
Heat up ....................................... 10 K to 450 K < 8 minutes
Cooldown (subsequent) ......... 450 K to 10 K < 50 minutes

Construction and Specifications

Sapphire rod with stainless steel bracing (NOT electrically isolated).
Will work at temperatues up to 500 K for durations of less than an hour.
Thermofoil heater – Kapton foil with Manganin wire filament.
OFHC copper C-101 alloy.
High temperature epoxy.
Some adhesive (some initial outgassing expected).