PRODUCTS

Cryostats T< 3 K / 10 K / 70 K

Entropy provides closed-cycle cryostats based on 1- and 2-stage GM or pulse-tube coolers for continuous operation at low temperatures.

  • Various temperature ranges with different cooling power
  • GM cooler for 70 K, 50 K and 10 K
  • Pulse-tube cooler for temperatures < 3 K
  • Variable sample space available
    • Ø 180 x 200 mm (S-series)
    • Ø 230 x 300 mm (M-series)
    • Ø 300 x 400 mm (L-series)
    • Or completely custom-made
  • Vibration isolation by copper braids and bellows
  • Sample magnets on request
  • Fully featured setup with temperature sensors and heaters
  • Electronics and software
  • TCP/IP interface for remote control
  • Fully assembled and tested or as a cryostat kit for assembly by the client
Kryostaten Kit 4K   Bild 01_var03

Cryostat 10K
Kryostat 70K eckig isometrisch-small

Joule-Thomson T< 1 K

The Entropy cryostat with Joule-Thomson stage offers continuous operation at temperatures around 1 K and a cooling power of a few Milliwatt.

Entropy JT cryostats are available as M- and L-series based on pulse-tube coolers with a cooling power of 0.5 W or 1.0 W at 4.2 K and various sample space.

JT stage with turbo pump:

  • Base temperature: < 0.9 K
  • Cooling power: a few mW at 1.0 K

JT stage with fore pump only:

  • Base temperature: < 1.2 K
  • Cooling power: a few mW at 1.3 K

Sample space at 4K:

  • Ø 230 x 300 mm (M-series)
  • Ø 300 x 400 mm (L-series)
  • Or completely custom-made
Hauptflansch JT M-Serie 64xSMA   0167_Entropy_05_Ausschnitt 400x331dpi

Application example:

Cryostat for operating 64 Superconducting Single Photon Detectors (SSPDs) below 1K.

JT M-Serie offen   0167_Entropy_01 315x790dpi

The systems come fully featured up with temperature sensors, heaters, electronics and software with TCP/IP interface for remote control.

Several accessories such as DC cables, coax cables, circuit boards, fibers, optical ports and sample magnets are available on request.

Sorption T< 300 / 800 mK

The Entropy cryostats with sorption units are available as M- and L-series based on pulse-tube coolers with a cooling power of 0.5 W or 1.0 W at 4.2 K and various sample space.

We offer the cryostats with He-4 and He-7 sorption units from our partner Chase Research Cryogenics LTD.

Cryostat with He-4 Unit:

  • Base temperature: < 1 K
  • Hold time: > 12 hours @ 1 K with 100 µW heat load

Cryostat with He-7 Unit:

  • Base temperature: < 300 mK
  • Hold time: > 24 hours @ 300 mK with 20 / 50 µW heat load

Sample space at 4K:

  • Ø 230 x 300 mm (M-series)
  • Ø 300 x 400 mm (L-series)
  • Or completely custom-made

The systems come fully featured up with temperature sensors, heaters, electronics and software with TCP/IP interface for remote control.

Several accessories such as DC cables, coax cables, circuit boards, fibers, optical ports and sample magnets are available on request.

He-7 offen gerade 0288_Entropy_3

ADR T< 50 / 800 mK

Our ADRs offer a fast and reliable way to get into the Millikelvin range. Optimized for easy access and handling.

The Entropy ADR cryostats are available as M- and L-series based on pulse-tube coolers with a cooling power of 0.5 W or 1.0 W at 4.2 K and various sample space.

The ADR stage consists of a superconducting magnet, a double-stage salt pill unit and a heat switch.

Base temperature: 30mK

Cooling capacity: 150 mJ @ 100 mK, 1.8 J @ 1 K

Hold time: more than 48 hours @ 100 mK

Recharge time: 1 hour

Sample space at 4K:

  • Ø 230 x 300 mm (M-series)
  • Ø 300 x 400 mm (L-series)
  • Or completely custom-made

The systems come fully featured up with temperature sensors, heaters, electronics and software with TCP/IP interface for remote control.

Several accessories such as DC cables, coax cables, circuit boards, fibers, optical ports and sample magnets are available on request.

Kryostat 4K im Trolley offen   0145_137_Detail02Modell03

Dilution Refrigerator T< 30 mK

A dilution refrigerator is a continuously operating cooling system for temperatures in the Millikelvin range.

Our dilution is available in various configurations with different base temperatures and cooling power.

Sample space at 1 K:

  • Ø 180 x 150 mm (M-series)
  • Ø 250 x 200 mm (L-series)
  • Or completely custom-made

The systems come fully featured up with temperature sensors, heaters, electronics and software with TCP/IP interface for remote control.

Several accessories such as DC cables, coax cables, circuit boards, fibers, optical ports and sample magnets are available on request.

 

Mischer offen im Gestell   0184_Entropy_01_Detail 398x480dpi

COBox Low Vibration

The COBox is a unique solution from Entropy for vibration-sensitive experiments at low temperatures. For maximal vibration isolation the COBox is connected rigidly to your optical table and only flexibly to the coldest stage of the cryostat.

The COBox is available in combination with:

  • Pulse-tube cooler only for temperatures < 3 K
  • Joule-Thomson cryostats for temperatures around 1 K
  • Dilution refrigerators for temperatures < 50 mK
COBox-4K   Bild 01 small

Temperature Sensors

Thick-film chip resistors based on Ruthenium Oxide are effective low-temperature thermometers.

Entropy offers several types of RuOx sensors for different temperature ranges and applications in high magnetic field.

UB09-2-0007-0~00 1669x800dpi

0184_Entropy_02_Kleinteil1_2 400x164dpi

Housing: The standard sensor housing is made of pure silver or copper. A minimal amount of pure epoxy is used in the construction to avoid heat-capacity anomalies from epoxy fillers. The sensor has an integrated SMD connector for easy and reliable electrical connection.

Other housing options such as chips on silver foil or naked are available on request.

RuOx Type A

  • Useful down to 200 mK
  • Individually calibrated
  • Typical resistance: 100 kΩ at 200 mK

RuOx Type B

  • Useful down to 20 mK
  • Individual or batch calibration available
  • Typical resistance: 10 kΩ at 100 mK

RuOx Type C

  • Very small magneto-resistance
  • Individually calibrated
  • Useful down to 50 mK
  • Typical resistance: 100 kΩ at 100 mK

RuOx Type D

  • Useful down to < 30 mK
  • Individually calibrated
  • Typical resistance: 15 kΩ at 100 mK

             Typical Resistance Values

All RuOx R(T)

                Typical Sensitivity Values

All RuOx S(T)

         Typical Dimensionless Sensitivity Values

All RuOx dimlessS(T)

RuOx Type Z

  • Customized sensor
  • Individually calibrated

Ask us for a tailored solution for your application.