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Diacell® LN2-DAC System

Optical and X-ray spectroscopy, Cryostat with integrated DAC, Pmax = 50 GPa, Tmin = 77 K
  • The Diacell® LN2-DAC System enables experiments at pressures up to 50 GPa and temperatures down to  the order of 77 K
  • The system combines and fully integrates the Diacell® CryoDAC-Nitro to a liquid nitrogen bath cryostat
  • The key advantages of the Diacell® LN2-DAC System are its simplicity and cost effectiveness
  • Four quartz windows are supplied as standard
  • Pressure can be changed in the cell whilst cold, since the Cryo-DAC Nitro is gas membrane driven
  • Cryostat system includes sample holder for CryoDAC Nitro and 2 channels temperature controller
  • Options: an integrated Optiprexx RubyLux system automated for ruby fluorescence

 

SKU: A93000

For more info, quotation or call: Contact us

Description

The Diacell® LN2-DAC System is a liquid nitrogen bath cryostat with integrated high pressure diamond anvil cell.
Simplicity and cost effectiveness are the key factors of the Diacell® LN2-DAC system. The liquid nitrogen cooled cryostat provides a variable temperature sample environment with no valves or adjustments required (temperature controller is included).
Designed with versatility in mind, the system comes with the Diacell® CryoDAC-Nitro integrated (fitted with type Ia diamond anvils), enabling work down to 77 K and up to 50 GPa. Pressure can be changed in the cell whilst cold, since the CryoDAC-Nitro is gas membrane driven.
Four quartz windows are standard on the cryostat, which also has a port enabling the feedthrough of the gas membrane line. An optional fibre optic or electrical feedthrough port is also available.
Temperature below 77 K can be achieved (down to around 65 K) depending on the vacuum level. In this case an optional pumping manyfold is required (not supplied).
Note: Gas controller is sold separately.
A turbo pump is recommended to evacuate the vacuum shroud. A primary pump with a nitrogen cold trap can also be used but in this case, the thermal performance will not be optimal, leading to a slightly higher base temperature.

Specifications

Cryostat type Liquid nitrogen bath
Temperature Range 77 K – 300 K
Typical LN2 hold time 8 hours at 77 K
Cool down time ~15 min
Sample access Four windows
Standard Window Quartz
Spare ports One electrical or fibre optic feedthrough (optional)
Safety Evacuation valve and safety pressure relief
Integrated Diamond Anvil Cell Diacell® CryoDAC-Nitro
DAC Pressure Mechanism Gas Membrane
Maximum Pressure 50 GPa
DAC Working Distance 11 mm
Cryostat Working Distance 47 mm
Cryostat Weight 3.30 Kg

Maximum pressure is dependent upon the culet size of the anvils. Almax easyLab is committed to its policy of continuous improvement. Specifications may change without notice. easyLab and Diacell are registered trademarks of Almax easyLab.

Documents

We have compiled a series of technical documents (brochures, articles, technical drawings, …) which you might find useful to help you understand this product better.

Technical documentation

Brochure LN2-DAC

Technical Drawing

Please contact us for further details on the engineering drawings.

Spares, Accessories and Options

Our products are tested before leaving our factory on their way to your laboratory.
They also come supplied with the required basic tooling, including gasket blanks, to use them. All is contained in the transportation casing to move around laboratories easily.

Below you can find some of the accessories and spares you might also consider. If you cannot find what you need, please do not hesitate to contact our team.

Pumping System
Turbo pump with its controller
Product code: [A95050]
Gas Membrane
Spare gas membrane enabling enabling the use of the DAC outside the cryostat
Product code: [A76030]
CryoDAC Nitro Screw Ring 
Spare DAC screw ring enabling the use of the DAC outside the cryostat
Product code: [M69004]
Diamond anvil fitted in ring Diamond Anvils
2.5 mm Diacell® design diamond anvil, force fitted in BeCu rings for easy fitting in
the CryoDAC-Nitro
Product code: [P00131], [M50003]
Gasket Blanks 
BeCu gasket blanks, 10mm diameter; 0.25mm thick
Product code: [P01314]
Ruby Powder
Variable size ruby grains for pressure calibration
Product code: [P00104]

 

FAQs

Why is the sample pressure not going up at low temperature while increasing the gas membrane pressure?  

At low temperature, the gas pressure into the membrane must be higher than at room temperature to see a change in sample pressure (a ruby shift).
To successfully increase the sample pressure when performing low temperature experiments, the following steps are necessary:

  • Check the pressure of your helium supply cylinder to ensure that there is sufficient gas available for the gas membrane (120 bar or higher);
  • Before cooling, at room temperature, slightly increase the sample pressure with the gas membrane (0.5 GPa to 1-2 GPa). The gas pressure in the membrane should help to increase the pressure at low temperature;
  • Start cooling;
  • Leave the gas membrane controller in manual mode to avoid constant pressure control on the membrane.

The helium pressure in the gas membrane will slowly decrease during cooling. The sample pressure should not decrease, but increase slightly due to the contraction of the mechanical parts of your DAC.

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