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LT4-DMX-1AL

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The LT4-DMX-1AL is our lowest cost liquid flow cryostat for optical and electrical experiments.

Click here to download the LT4-DMX-1AL data sheet (PDF).

The LT4 works with either liquid helium or liquid nitrogen. The LT4 utilizes a standard transfer line and cold tip. If you need lower vibrations, take a look at the high performance LT3-WMX-1.

Click here to see more Advanced Research Systems flow cryostats.

Applications
  • Optical: UV, VIS, IR
  • Electro-optical
  • Magneto-optical
  • Resistivity/Hall effect
  • High frequency electrical
  • Diamond anvil cell
  • DIP
  • Liquid samples
  • Non-optical
  • Thermal
  • Electrical
  • Magnetic susceptibility
  • Matrix isolation
  • Mossbauer
Features
  • Liquid helium flow
  • Low cost aluminum construction
  • Large, clear-view optical windows (1.25 in)
  • Large sample viewing angle for optical collection (F/1)
  • 4.2 K liquid helium operation
  • 0.75 LL/hr liquid helium consumption at 4.2 K
  • Liquid nitrogen comparable (77 K operation)
  • Fully customizable
Typical Configuration
  • Cold head (LT4-DMX-1AL)
  • Liquid helium transfer line
  • Bolt on aluminum instrumentation skirt
  • Dewar adapter
  • Low cost aluminum vacuum shroud for optical and electrical experiments (DMX-1AL)
  • Aluminum radiation shield
  • 2 high purity quartz windows
  • Instrumentation for temperature measurement and control:
    • 10 pin feedthrough
    • 36 ohm thermofoil heater
    • Silicon diode sensor curve matched to (± 0.5 K) for control
    • Silicon diode sensor curve matched to (± 0.5 K) with 4 inch 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
  • High flow transfer line
  • 450 K high temperature interface
  • 800 K high temperature interface
  • Custom temperature sensor configuration (please contact our sales staff)
  • Custom wiring configurations (please contact our sales staff)
  • Sample holder upgrades (custom sample holders available)
  • Window material upgrades (custom materials available)

The ARS Advantage

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 36 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) 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 LT4-DMX-1AL can accept all but our largest sample holders. Like all of our cold fingers, the LT4 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.

DMX-1AL Specifications

Cooling Technology-
  LT4 Open Cycle Cryocooler
  Refrigeration Type Liquid helium Flow
  Liquid Cryogen Usage Helium, Liquid Nitrogen Compatible
Temperature*-
  LT4 < 4.2 K - 350 K
  With 800 K Interface (Base Temp + 2 K) - 700 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 36 mm (1.43 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
  Window Material View our Wide Selection of Window Materials
Temperature Instrumentation and Control (Standard)-
  Heater 1 - 36ohm Thermofoil Heater Anchored on Cold Tip
  Control Sensor 1 - Curve Matched Silicon Diode
  Sample Sensor 1 - Curve Matched Silicon Diode
  Custom Instrumentation Contact ARS for available Options
Instrumentation Access-
  Instrumentation Skirt Bolt-on, Aluminum
  Pump out Port 1 - NW-25
  Instrumentation Ports 2
  Instrumentation Wiring Contact our sales staff for wiring options
Vacuum Shroud-
  Material Aluminum
  Length 338 mm (13.3 in)
  Diameter 76 mm (3 in) (at the sample space)
  Width 76 mm (3 in) (at the sample space)
Radiation Shield-
  Material Aluminum
  Attachment Threaded
  Optical Access 0, 2, or 4(customer specified)
Cryostat Footprint-
  Overall Length 438 mm (17.23 in)

Liquid Helium Flow Cryostat Specifications

Cryostat Model LT4
   Cryogen Liquid helium Liquid nitrogen
   Base Temperature 4.2 K 77 K
   Nominal Helium Consumption at 4.2 K 0.75 LL/hr  
    Cooling Capacity- 1.5 W  
    Maximum Temperature 350 K, upgradeable to 450 K  

LT4-DMX-1AL
Full Cryostat

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