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Diacell® HeliosDAC

Optical and X-Ray Spectroscopy, Pmax = 100 GPa, Tmax = 1300 K, WD = 14 mm, A = 50°
  • The Diacell® HeliosDAC is suitable to both optical (numerical aperture of 0.42) and X-ray (2θ up to 50°) experiments
  • Using an internal compact resistive gasket heater the Diacell® HeliosDAC is able to reach 1300 K
  • Maximum pressures of up to above 100 GPa may be obtained with the Diacell® HeliosDAC
  • Being a gas membrane driven DAC, the pressure within the Diacell® HeliosDAC can be adjusted whilst at high temperatures
  • The Diacell® HeliosDAC employs a series of unique insulating stages to maintain the cell at reasonable temperature even when operating at full power
  • The Diacell® Helios DAC Plus is another version of this cell that employs Boehler-Almax anvils, enabling even larger X-ray apertures.

SKU: A59000

For more info, quotation or call: Contact us


The Diacell® HeliosDAC has been designed specifically for the high-temperature range up to 1 300 K. It is suitable for both X-ray diffraction (2θ up to 50º) and optical work. It has gas-membrane drive, which is particularly suitable for high temperature operation as it is easy to compensate for any pressure changes due to heating. On holding the sample at 1 300 K for several hours, the exterior of the cell reaches a little over 700 K.

In the Diacell® HeliosDAC, heat is delivered directly to the gasket using a compact resistive heater that generates about 80 W at the gasket. With this design it is possible to generate heat within the smallest space around the anvils. This in turn avoids use of exotic construction materials and makes high temperature operation of the cell more reliable.

In high temperature operation using resistive heating it is essential to flush the interior of the cell, and all exposed faces of the diamond anvils, with a mildly reducing gas such as the commercially-available argon – 2% hydrogen mixture. This protects both the anvils and the interior of the cell from tarnishing.


There is an increasing demand for DACs that will operate at high temperatures.  It is generally agreed that above about 1 300 K the only realistic option is laser heating. Such installations are complex and expensive. However, for temperatures of up to 1300 K resistive heating is attractive as it is relatively simple.  Therefore, the Diacell® HeliosDAC is perfect for such application.

Two videos concerning the HeliosDAC are available on  Almax easyLab’s YouTube channel.  The video for disassembling the heater may be found by clicking here.  Similarly, the complementing video showing the re-assembling may be found here.


Cell Material AISI 440C
Anvil Support Plate Tungsten Carbide
Pressure Mechanism Gas Membrane
Maximum Pressure 100 GPa
Temperature Range 1 300 K
Top Angle Conical 50º
Bottom Angle Conical 50º
Lateral Access None
Heating Internal gasket heater
Cooling N/A
DAC Diameter 56 mm
DAC Height 45 mm
Working Distance to Sample 14 mm
Numerical Aperture 0.42
Interfacing Solution TBC
DAC Weight 500 g
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.


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 HeliosDAC

Technical Drawing

Please contact us for further details on the engineering drawings.


2020 – Shukla, B et al. – Compressibility and thermal expansion study of d-UZr2 at high pressure and high temperature

2023 – Vithanage, D et al. – High-pressure response of vibrational properties of b-AsxP1-x in situ Raman studies


Spares, Accessories and Options

Our diamond anvil cells are aligned and mechanically 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.

Diamond Anvils
3.1 mm Diacell® design diamond anvils, fitted in stainless steel rings for easy fitting in the HeliosDAC
Product code: [P00132], [M50013/M50006]
Anvil Support Plate
Tungsten carbide seat with 50° opening angle
Product code: [P0124]
Gas Membrane 
Spare gas membrane for Diacell HeliosDAC
Product code: [A76010]
Gasket Heater 
Heater and type-K thermocouple for Diacell HeliosDAC
Product code: [A59100]
Gearbox designed to drive the 4 clamping screws simultaneously
Product code: [A59102]
Temperature Controller for Heaters
PS-03 – Keithley/Temperature Reader including Labview® based programm
Product code: [A75060]
Gasket Heater Spares
HeliosDac Gasket heater replacement kits for heater leads
Product code: [A59130]
Gasket Heater Spares
HeliosDac Gasket heater replacement kits for ceramic tubes
Product code: [A59120]
Gasket Blanks
Inconel gasket blanks, 10mm diameter, 0.26 mm thickProduct code: [P02214]


What is the maximum pressure I can achieve with the HeliosDAC and a given culet size?

Culet size (µm) 200 300 400 500 600 800 1000
Pmax (GPa) (*) 114 98 63 41 28 16 10

(*) The Pmax values are only indicative. The maximum pressure achievable with a DAC is influenced by many others experimental parameters, like the gasket characteristics (material, thickness and hole size) or the pressure transmitting medium.


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