Autonomous type cryostats

 

Laboratory research cryostats autonomous type designed to maintain the desired temperature in the 1.4 - 500 K (77-500K) in the working area of the cryostat - thermostatic chamber - and in its design is liquid-flowing.

Helium cryostats

Design and operation principle

Inside a demountable body is placed the helium can,enclosed by the copper screen, which cools by liquid nitrogen filled in nitrogen can. The nitrogen reservoir is for cooling of a heat shield. The vacuum cavity of a cryostat is evacuated by a vacuum pump through the vacuum cock. The high vacuum forms by built-in cryopump.
In a centre of cryostat body the load-in column is placed, which ended below by thermostatting chamber, on outside of which is coiled electric heater. In bottom of chamber is welded the heat exchanger, joint with a tube of helium submission. Liquid cryoagent moves through a capillary tube from bottom of column and is evaporated on a heat exchanger.

From above load-in column is finished by thread with laying, on which with the help of castable a nut the manipulator fastens.
Temperature of cryoagent is controlled with a help of setting of an electric current in a heat exchanger. At temperatures 4,2 - 350 K samples are in a stream of cryogenic gas, which upwards. The stream of cryogenic gas is controlled by a differential pressure regulator, which is disposed in a manostat. The combined system of regulation of a gas current and temperature of a heat exchanger allows to obtain a high accuracy of maintaining of a temperature and low consumption of a liquid cryoagent. Temperatures from 4,2 K up to 1,4 K are reached by pumping-out of cryogenic gas. In this interval of temperatures the sample is sub merged in a liquid cryoagent. The change of a sample is manufactured through the upper flange of column.

For pursuance of spectral research on body , screen, thermostatting chamber the windows are mounted.
For prevention of destruction of the cryostat at recompression in a nitrogen can the relief valve is installed, the burst disc of which is guaranteed on operating pressure 7х 10⁴ Pа.

Series CRYOPT

Applications:

• Optics
• Elektrooptyka
• Raman spectroscopy
• Spectroscopy
• Polyarizatsiyna optics
• Optical-mechanical studies

A240 Optical liquid-protichnyy cryostat

Liquid-protichnyy cryostat used UTRECS system for temperature control object in optical, electro and radio physical photovoltaic research in the spectral range 0,2-7; 0,23-2, 0,7-17, 0,9-25, 30-1000 microns

Design Features

Diameter shafts, mm	33
Optical inputs, location (Direction axes in cross-section), degrees	0-90-135-180
Material internal windows (optional)	Fused quartz, leykosapfir, ZnSe, CdTe, mylar
Internal windows (light appertura) mm	16
Nitrogen tank capacity, liters	1,2
Helium tank capacity, liters	1,7
Maximum flow of liquid helium, l/h at
1,5К	0,1
4,2 К	0,08
80 К	0,07
Temperature sensor	Silicon thermal diode

Specifications cryosystems using temperature controller

Control area, K	1,4-350
Discreteness installation temperature, K	0,1
Temperature stability	±0.05
Weight (kg)	8
Base temperature, K	4,2
Refrigeration time, min	60
The diameter of the specimen, mm	33

Packing List

1. Cryostat
2. Temperature controller series K41 or K43 with manostatom
3. Transport helium manifold
4. Sample holder (mounted)

Additional Options

1. Optimization of optical windows to the requirements of the experiment.
2. The maximum number of windows in the horizontal plane - 6.
3. Material windows
   • Sapphire.
   • А2В6 (ZnSe, ZnS, CdTe etc.)
   • Other types of materials windows on demand.
4. Maximum aperture optical windows - 32° (5 windows).
5. Increasing the diameter of the windows on the clearance of 25 mm.
6. Windows for polarization studies of polarization ratio of less than 1%.
7. Additional window in the bottom of the cryostat.
8. The minimum distance from the outside box to sample horizontal windows or windows below kryostata - 10 mm.
9. The asymmetric arrangement of the sample. Maximum aperture at the sample location of the asymmetric pattern -90°.
10. The angle between the axes of windows - 90°, 180°.
11. The height of the windows on the lower edge of the cryostat - from 60 to 400 mm.
12. Rectangular shank cryostat for research into the magnetic field. Minimum distance Between the poles of magnets - 45 mm.
13. Calibration table for thermal diode.

Accessories

1. Sample holder
   • Rotating the sample by 360° around the axis of the windows.
   • X and X-Y adjustment zrazka
   • The asymmetric arrangement of the sample in the box.
   • Fitting the mechanical load of 200 kg at liquid helium temperatures.
2. The transport system of liquid helium.
3. Sample holder with universal flange.
4. Measuring tape holder design.
5. Electric razyom 7 or 10 contacts.
6. Level superfluid helium cryostat chamber
7. Pressure stabilizer (for use with pumping helium vapor from the working chamber of the cryostat)

Main advantages

• Low power consumption of cryogen.
• The flexibility of the design.
• Use single thermostat and gauges when working with liquid helium and nitrogen.

TOP⇑

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Series CRYOMAG

Areas of application

• Magnetooptics and spectroscopy
• Magnetoelectric research

A227 Optical liquid-flow cryostat Optysol

Liquid-flow cryostat used UTRECS system for temperature control facility in magneto-optical studies in the field of 0-4 T, created by a superconducting solenoid type Voigt. Spectral region by choosing 0,2-7; 0,23-2, 0,7-17; 0,9-25; 30-1000 microns

Design Features

Diameter shafts, mm	19
Optical inputs, location (Direction axes in cross-section), degrees	0-90-180-270
Material internal windows (optional)	Fused quartz, leykosapfir, ZnSe, CdTe, mylar
Internal windows (light appertura) mm	10
Nitrogen tank capacity, l	3,2
Helium tank capacity, l	5,5
Maximum flow of liquid helium, l/h	0,35
Temperature sensor	Silicon thermal diode

Specifications cryosystems using temperature controller

Control area, K	1,6-350
Discreteness installation temperature, K	0,1
The stability of the temperature, K	0,1
Weight (kg)	18

A258 Optical liquid-flow cryostat Optymah

Liquid-flow cryostat used UTRECS system for temperature control facility during the magneto-optical studies in the spectral range 0,23-2; 0.2-7, 0.7- 17, 300-1000 microns in the magnetic field generated by an external magnet

Design Features

Diameter shafts, mm	19
Optical inputs, location (Direction axes in cross-section), degrees	0-90-180-270
Material internal windows (optional)	Fused quartz, leykosapfir, ZnSe, CdTe, mylar
Internal windows (light appertura) mm	10
Nitrogen tank capacity, l	1,2
Helium tank capacity, l	1,7
Maximum flow of liquid helium, l/h,
1,5К	0,1
4,2 К	0,08
80 К	0,07
Temperature sensor	Silicon thermal diode

Specifications Cryosystems using temperature controller

Control area, K	1,4-350
Discreteness installation temperature, K	0,1
Temperature stability	±0.01
Weight (kg)	8
Base temperature, K	4,2
Refrigeration time, min	60
Continuous operation time, h,
1,5 К	15
4,2 К	20
80 К	24
Time changes in the sample, min.	5
The diameter of the specimen, mm	19
Base temperature, K	77
Control area, K	77,80-350
The stability of the temperature, K	±0.05
Refrigeration time, min	20-40
Continuous operation time, h,
77 К	30
80 К	16
150 К	26
250 К	24
Time changes in the sample, min.	5
The diameter of the specimen, mm	19

All non-optical versions of these types of cryostats allow you to adjust the temperature from 1.4 K to 500 K. TOP⇑

• Categories

  • Helium cryostats
  • Nitrogen cryostats
  • Universal cryostats