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CS202SF-DMX-20 With Beryllium Windows for Mossbauer Experiments
DMX-20 Ultra Low Vibration Exchange Gas System with Elastomeric Direct Mounts

The CS204F-DMX-20 opens up a wide range of capabilities never before possible with a closed cycle cryocooler. The CS204F-DMX-20 uses a helium exchange gas to decouple the sample from the cold tip of the DE-204 cryocooler. This prevents almost all vibration from being transmitted to the sample. Scientists have demonstrated vibration levels as low as 3-5 nm with the CS204F-DMX-20.

Because the exchange gas is inherently less efficient than cooling by conduction, the base temperature of the sample will be 1-2 K higher than the cryocooler. Additionally the DMX-20 interface requires a downward orientation of the cold tip to facilitate convective cooling of the exchange gas.

The CS204F-DMX-20 is ideally suited for Mössbauer experiments and vibrationally sensitive transport measurements. For optical microscopy applications, such as Micro Raman, Micro PL, and quantum dots, the CS204F-DMX-20-OM is preferred.

Download CS204F-DMX-20 Data Sheet

  • Nanoscience
  • Mössbauer
  • Low vibration optical experiments
  • Quantum dot
  • Photoluminescence
  • Micro-Raman
  • Micro-photoluminescence (Mirco-PL)
  • Micro-spectroscopy 
  • Magneto-optical Kerr effect (MOKE)
  • Ellipsometry
  • Ultra low vibrations (3-5 nm)
  • Pop-off optical block for easy in-situ sample change
  • Beryllium and Kapton windows available for Mössbauer experiments
  • Large, clear view optical windows (1.25 in.)
  • Large sample viewing angle for optical collection (F/1.4)
  • Cold tip down orientation
  • Fully customizable
Typical Configuration
  • Cold head (DE-204AF)
  • Compressor (ARS-4HW)
  • 2 helium hoses
  • DMX-20 ultra low vibration interface
  • Aluminum vacuum shroud for optical and electrical experiments with 4 window ports on a pop-off optical block
  • Nickel plated OFHC copper radiation shield
  • 2 high purity quartz windows
  • Instrumentation for temperature measurement and control:
    • 10 pin hermetic feedthrough
    • 50 ohm thermofoil heater
    • Silicon diode sensor curve matched to (± 0.5 K) for control
    • Calibrated silicon diode sensor (±12 mK) with 4 in. free length for accurate sample measurement
  • Wiring for electrical experiments:
    • 10 pin feedthrough
    • 4 copper wires
  • Sample holder for optical and electrical experiments
  • Temperature controller
Options and Upgrades
  • 4 K cold head (0.2 W @ 4.2 K)
  • 5.5 K cold head (3 W @ 10 K)
  • Turbo upgrade for faster cooldown times
  • High temperature interface (not required with the DMX-20 interface, but helpful for high temperature performance)
  • Very high temperature interface
  • Custom temperature sensor configuration (please contact our sales staff)
  • Custom wiring configurations (please contact our sales staff)
  • Beryllium windows for Mössbauer experiments
  • Kapton windows for Mössbauer experiments
  • Window material upgrades (custom materials available)
  • Sample holder upgrades (custom sample holders available)

The ARS Advantage

The Ultra Low Vibration Exchange Gas Interface
A Schematic Representation of the DMX-20 Interface

The X-20 interface uses a helium exchange gas to decouple the sample space from the cold tip of the cryocooler. This prevents almost all vibration from being transferred to the sample space. Scientists have demonstrated vibration levels as low as 3-5 nm with the CS202*E-DMX-20.

1. The cryocooler is supported by a floor stand.
2. The soft rubber bellows minimize the vibrations transmitted to the sample while keeping in the helium exchange gas.
3. The X-20 interface has no contact with the cryocooler except through the rubber bellows.
4. The cold tip has 10-30 micron vibrations (depending on CCR model) but no direct contact with the sample space.
5. Convective pockets of helium exchange gas cool the sample space.
6. The sample is only in contact with the X-20 interface.
7. Windows provide access for optical experiments.
8. The X-20 interface is mounted directly on a (user provided) vibration isolation table.

4 K, 5.5 K, 10 K Fine-Tuned For Your Temperature Range
A Selection of ARS Manufactured Displex Cold Heads

The DE-204SF cold head is a precision machine carefully tuned to achieve temperatures below 4 K with 0.2 W of cooling power at 4.2 K.

The DE-204AFcold head is a rugged workhorse built with power and durability in mind, achieving temperatures below 9 K with 2 W of cooling power at 10 K.

The DE-204PF cold head is a hybrid of the the 4 K and 10 K philosophies, achieving a balance that exhibits the best of both worlds, with temperatures below 5.5 K and 3 W of cooling power at 10 K.

High Temperature Options
800K Interface Manufactured by ARS

Our high temperature interfaces use a unique combination of mechanical and thermodynamic properties to create a high temperature thermal disconnect between the cold head and the sample space. This allows for heating of the sample space far in excess of the maximum 355 K temperature of our cryocoolers.

450 K The Easy Way

Our 450 K interface is a simple semi-permanent addition to the cold tip that expands the upper sample temperature range by 95 K utilizing most of the same instrumentation as our standard cryocoolers.

800 K - Pouring on the Heat

Our specially designed 800 K interface goes beyond the standard techniques to provide a unique system that maximizes thermal conduction at low temperatures while minimizing heat transfer at high temperatures. Beyond the safe operating temperature of silicon diodes, the standard sensors are replaced with E-type thermocouples and platinum RTDs.

Wired the Right Way - Your Way
Thermally Anchored Sensor Wiring on the DE-202 Cold Tip

Our technicians painstakingly wrap each cold head for optimum thermal anchoring. We offer you the choice of a variety of wiring options, from our standard offerings of single strand copper and low noise coaxial wiring packages to any number of custom wiring configurations.

Typical instrumentation for temperature measurement and control include one 50 ohm thermofoil heater, one curve matched silicon diode for rough temperature control, and one free length calibrated diode for direct attachment to the sample or sample holder for accurate temperature measurement. Silicon diode sensors are favored heavily for most standard applications because of their low cost, durability, and stability, but we do offer a wide variety of other sensors for different applications such as Cernox sensors for high magnetic fields, E-type thermocouples for 4 K-800 K measurements, and platinum RTDs for accurate high temperature measurements.

Our wide selection of wiring and instrumentation is matched by an equally wide selection of temperature controllers from Cryocon, Lake Shore, and Scientific Instruments.

Specialized Optics For All Applications
DMX-1AL Optical Block

Window Materials for All Transmission Ranges

High purity quartz is the standard window material for most of our optical cryostats, but we have a wide variety of other window materials available, from near IR materials like CaF2 and KBr to far IR and terrahertz like Ultra High Molecular Wright Polyethylene and Picarin, to Kapton, Mylar and beryllium for x-ray experiments. If you don't see the window material you're looking for, please contact one of our sales representatives.

Optimized for Weak Signal Collection with Minimum Heat Load

The tiered optical access of the 1.25" clear view vacuum shroud window and radiation shield optical ports allows for a large cone of optical access (F/1.4) and at the same time limits the area of exposure to 300 K thermal radiation.

Low Stress Window Mounts

Our window ports are designed to gently cradle the window material, creating a low stress seal that limits optical distortions.

A Sample Holder for Every Measurement
SHOE-1C Sample Holder for Optical and Electrical Experiments

Whether the measurement is optical or electrical in nature, the sample large or small, we have a sample holder for almost any measurement. The CS204*F-DMX-20 can accept all but our largest sample holders. Like all of our cold fingers, the DE-204 has a 1/4-28 threaded hole on the cold tip to mount the sample holder. So even if you do not find what you need from our wide variety of sample holders there is always the option of attaching a custom sample holder.

Water Cooled Compressor For Your Convenience
The ARS-2HW Compressor

The water cooled ARS-4HW compressor that powers the DE-204 Series cold heads has many benefits that are amplified in small laboratory settings. The water cooling redirects heat energy that would otherwise be dumped into the lab by a large cooling fan. The lack of a large cooling fan also dramatically reduces the noise of these compressors (only 60 dBA). Additionaly with minimum air circulation, the air currents and dust are kept to a minimum. The high efficiency heat exchanger results in low water usage and saves space inside the compressor, giving it a small footprint. When water is not available our Coolpac™ remote recirculation system can send cooling water from up to 100 feet away.

Easy Do-It-Yourself Maintenance
DE-202 Disassembled for Service

The ARS DE-204 Closed Cycle Cryocooler operates on a pneumatically driven Gifford-McMahon refrigeration cycle that is both mechanically simple and robust.

12,000-Hour Maintenance Cycle

Over time the internal components of the cold head begin to wear. Eventually the performance of the cold head will decline and some time after 12,000 hours certain internal components need to be replaced or refurbished. With most closed cycle cryocoolers the only option is to send the cold head back to the manufacturer for service.

A Second Option

The simplicity of the ARS pneumatically driven cryocooler allows for another option. Our customers can purchase a service kit for our 10 K and 5.5 K cryocoolers that replaces all of the worn components. This service kit can be ordered ahead of time and reduce down time to a matter of hours instead of weeks.

DMX-20 Specifications

Cooling Technology-
  DE-204 Closed Cycle Cryocooler
  Refrigeration Type Pneumatically Driven Gifford-McMahon Cycle
  Liquid Cryogen Usage None, Cryogen Free
  DE-204AF < 10 K - 350 K
DMX-20 interface adds 1-2K to base temperature
  DE-204SF < 4.2 K - 350 K
DMX-20 interface adds 1-2K to base temperature
  DE-204PF < 5.5 K - 350 K
DMX-20 interface adds 1-2K to base temperature
  With 800 K Interface (Base Temp + 2 K) - 800 K
  With 450 K Interface (Base Temp + 2 K) - 450 K
  Stability 0.1 K
  *Based on bare cold head with a closed radiation shield, and no additional sources of experimental or parasitic heat load.
Sample space-
  Diameter 47 mm (1.87 in)
  Height 39 mm (1.53 in)
  Sample Holder Attachment 1/4-28 screw
  Sample Holder View our Sample Holder Collection
Optical Access-
  Window Ports 4 - 90° Apart
  Diameter 41 mm (1.63 in)
  Clear view 32 mm (1.25 in)
  #/F 1.4
  Window Material View our Wide Selection of Window Materials
Temperature Instrumentation and Control (Standard)-
  Heater 1 - 50 ohm Thermofoil Heater Anchored on Cold Tip
  Control Sensor 1 - Curve Matched Silicon Diode
  Sample Sensor 1 - Calibrated Silicon Diode
  Custom Instrumentation Contact ARS for available Options
Instrumentation Access-
  Instrumentation Skirt Bolt-on, Stainless Steel
  Pump out Port 1 - NW-25
  Instrumentation Ports 2
  Instrumentation Wiring Contact our sales staff for wiring options
Vacuum Shroud-
  Material Aluminum
  Length 388 mm (15.29 in)
  Diameter 86 mm (3.38 in) (at the sample space)
  Width 86 mm (3.38 in) (at the sample space)
Radiation Shield-
  Material OFHC Copper
  Attachment Threaded
  Optical Access 0, 2, or 4(customer specified)
Cryostat Footprint-
  Overall Length 645 mm (25.4 in)
  Motor Housing Diameter 114 mm (4.5 in)
  Rotational clearance 200 mm (8 in) with "G" configuration
DMX-20 Sample Vibrations-
  Independent Mounting 3 - 5 nm
  Direct Soft Mount < 140 nm

DMX-20 Vibration Levels

DMX-20 Vibration Data Showing a 3-5 nm Vibration Peak at the Native 2.4Hz Frequency of the Cryocooler

Cryocooler Specifications

Cryocooler Model DE-204AE DE-204A(T)E DE-204PE DE-204SE
  Frequency 60 Hz 50 Hz 60 Hz 50 Hz 60 Hz 50 Hz 60 Hz 50 Hz
    Base Temperature < 9 K < 9 K < 9 K < 9 K < 5.5 K < 5.5 K < 4 K < 4 K
    Cooling Capacity- 4.2 K - - - - - - 0.2 W 0.16 W
  10 K 2 W 1.6 W 2.7 W 2.2 W 3 W 2.4 W 4 W 3.2 W
  20 K 9 W 7.2 W 12 W 9.6 W 8 W 6.4 W 8 W 6.4 W
  77 K 17 W 14 W 23 W 18.4 W 14 W 11 W 14 W 11 W
    Radiation Shield Cooling Capacity 18 W 14 W 24 W 19 W 18 W 14 W 18 W 14 W
       (1st Stage Cooling Capacity at 77 K)                
    Maximum Cylinder Temperature 355 K 355 K 355 K 355 K
    Cooldown Time- 20K 30 min 36 min 25 min 30 min 40 min 48 min 40 min 48 min
  Base Temperature 60 min 72 min 50 min 60 min 90 min 96 min 90 min 108 min
    Weight Expander 7.7 kg (17 lbs) 7.7 kg (16 lbs) 7.7 kg (16 lbs) 7.1 kg (16 lbs)
Compressor Model ARS-4HW ARS-4HW ARS-4HW ARS-4HW
    Standard Voltage Min 208 V 208 V 208 V 190 V 208 V 208 V 208 V 190 V
  Max 230 V 220 V 230 V 210 V 230 V 220 V 230 V 210 V
    Power Usage Singe Phase 3.6 kW 3.0 kW 3.6 kW 3.0 kW 3.6 kW 3.0 kW 3.6 kW 3.0 kW
    Dimensions: L 483 mm (19 in) 483 mm (19 in) 483 mm (19 in) 483 mm (19 in)
  W 434 mm (17.1 in) 434 mm (17.1 in) 434 mm (17.1 in) 434 mm (17.1 in)
  H 516 mm (20.3 in) 516 mm (20.3 in) 516 mm (20.3 in) 516 mm (20.3 in)
    Weight Compressor 73 kg (137 lbs) 73 kg (160 lbs) 73 kg (137 lbs) 73 kg (160 lbs)
    Typical Maintenance Cycle 12,000 hours 8,000 hours 12,000 hours 12,000 hours
CS204*F-DMX-20 Full Cryostat Drawing

Cryostat For Nanoscience: CS204*F-DMX-20
Full Cryostat

A Typical DMX-20 Installation Showingthe Motor Housing being supported by a floor stand and the Ultra Low Vibration Interface Supported by a Vibrationally Isolated Optical Table

A Typical DMX-20 Installation

ARS-2HW Compressor Drawing


Click on the images for full size.
CS204PF-DMX-20 with custom x-ray diffraction vacuum chamber


Featuring a custom X-ray Diffraction vacuum chamber for Ultrafast Time-Resolved Pump-Probe experiments, and a swappable chamber for Optical Spectroscopy measurements.

Courtesy of: Petr Němec


This ARS system is being used for basic optical characterization experiments (absorption, reflection and photoluminescence spectra), as well as magneto-optical characterization and time-resolved ultrafast laser spectroscopy.

CS204-DMX-20 - Narrow Gap

This cryostat was sold to Prof. Shannon Yee of the Georgia Institute of Technology. It will be used for applications which focus on heat transfer in combustion and energy systems. The cryostat’s wide operating temperature range allows the user to characterize thermoelectric performance across a range of 4 K to 800 K, and perform magneto-optical Kerr effect (MOKE) experiments. It was designed to have low vibration levels at the sample and to integrate with a narrow gap electromagnet.

The cryostat includes the following special features:
  • A custom-designed narrow gap vacuum shroud that integrates with the ultra-low-vibration interface (DMX-20).
  • A narrow gap vacuum shroud, machined from aluminum, which integrates seamlessly with the narrow gap environment of electromagnet pole pieces. (Pictured, top left.)
  • An 800 K high-temperature interface at the tip, with electrical feedthroughs thermally anchored on the cryocooler’s first and second stages. (Pictured, top right.)
  • Instrumentation for accurate temperature control across the range 4 K to 800 K, in the form of a Cernox sensor and cartridge heater.
  • A gold-plated radiation shield. This is the optimal choice for shielding your sample and achieving the lowest base temperatures.
  • Electrical feedthroughs which provide access for characterizing the sample’s resistivity and thermoelectric performance as a function of temperature.