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Function
The microCRYO102 is a compact continuous flow cryostat. A
cooling agent (liquid helium or liquid nitrogen) is transferred from a storage
dewar through a vacuum isolated tube to the heat exchanger. The sample is
mounted on the heat exchanger. The heat exchanger with the sample is positioned
in a pumped out chamber. The sample temperature is controlled by a temperature
controller unit. This unit forms a continuous flow of cooling agent from the
dewar and controls the temperature of the heat exchanger. The construction of
the cryostat enables use of microscope objectives with high magnification and
reflectivity measurements at high incidence angles.
The sample position can be changed to meet optimal
conditions for reflectivity measurements and microscopy. Modifications for
transmission and reflection are available.
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Spectroscopy cryostats can be equipped with IR, visible and
UV windows.
The compact design of the cryostat enables high heating and
cooling rates. The special construction of the sample chamber secures very low
magnitude of vibrations and excludes sample displacements due to the temperature
drifts. Cryostats can be equipped with a 10-pin connector for electric
measurements. Cryostat can be equipped with a 0.2 T water cooled magnet for
magneto-optic measurements.
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Basic parameters and modifications of microCRYO102 cryostats
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Modification
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microCRYO102HE
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microCRYO102N2
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Cooling
agent
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He
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N2
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Maximal sample
dimensions, mm
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Ø10 x 1
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Ø10 x 1
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Windows diameter,
mm
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20
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20
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Window
material
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Quartz
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Quartz
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Clear diameter for
transmission, mm
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7
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7
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Angle of acceptance for
reflectivity measurements, degrees
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120
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130
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Minimal working distance
for microscopy, mm
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6
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3
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Cryostat height,
mm
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40
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25
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Cryostat diameter,
mm
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100
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80
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Length of cooling agent
transfer tubes, mm
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250
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250
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Temperature range,
K
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4 - 300
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78 -
300
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Temperature stability in
the interval 4 - 50 K, K*
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±0.1
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Temperature stability in
the interval 50 - 300 K, K
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±0.2
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Temperature stability in
the interval 80 - 300 K, K
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±0.2
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Cool down time (to 4.2 K
or to 80 K), min
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20
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30
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Sample change time,
min
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25
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20
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He consumption at 4.2 K,
L/h
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1
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N2 consumption at 80 K,
L/h
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1
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He dewar (recommended),
L
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40
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N2 dewar (recommended),
L
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35
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Cryostat weight,
kg
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4
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4
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* - Temperature regulation system tSTAT335 is strongly recommended.
Operational scheme of the microCRYO102 cryostat
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Complete
system
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microCRYO102
cryostat.
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Temperature
controller tSTAT335.
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Vacuum isolated
transfer tube.
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Storage
dewar.
Optionally
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Optimization of
windows configuration for optical experiments.
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Maximal sample
dimensions, Ø30 x 8 mm.
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Windows
material
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Sapphire.
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A2B6 (ZnSe, ZnS,
CdTe etc).
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Other materials
on request.
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Maximum aperture
of an optic window up to 130°.
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Clear diameter
for transmission up to 20 mm.
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Low polarization
windows with polarization ratio less then 1 %.
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0.2 T magnets on
the cryostat top for magnetooptical measurements.
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Additional
equipment
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XY sample positioning
module inside the cryostat.
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Mechanical stress
application module at low temperatures.
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Cooling agent transfer
tube.
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10-pin electric
connections on the top of the sample holder.
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Storage He or N2
dewar.
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Dewar transport platform.
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0.2 T solenoid with water cooling.
Key
benefits
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Short working distance
about 2 mm.
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Simple temperature
regulation system - low price for the complete set-up.
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Easy use in commercial
optic and microscopy set-up’s.
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