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Diacell® HeliosDAC Plus

Optical and X-Ray Spectroscopy, Pmax = 50 GPa, Tmax = 1200 K, WD = 17.5 mm, A = 85°
  • The Diacell® Helios DAC Plus is another version of  the Diacell® Helios DAC cell that employs Boehler-Almax anvils, enabling larger X-ray apertures
  • By fitting the DAC with Boehler-Almax anvils and seats, the user can benefit from a total conical aperture of 85°
  • Having a 0.67 NA, the Diacell® HeliosDAC Plus is suitable to both optical and X-ray experiments
  • Using an internal compact resistive gasket heater the Diacell® HeliosDAC Plus is able to reach over 1200 K
  • This DAC employs a series of unique insulating stages to maintain the cell at reasonable temperature even when operating at full power
  • Maximum pressures of up to above 50 GPa may be obtained with the Diacell® HeliosDAC Plus
  • Being a gas membrane driven DAC, the pressure within the DAC can be adjusted whilst at high temperatures
  • YouTube video

SKU: A59002

For more info, quotation or call: Contact us


The Diacell® HeliosDAC Plus has been designed specifically for the high-temperature range up to 1200 K. This DAC is fitted with Boehler-Almax diamond anvils and seats that upgrades the Diacell® HeliosDAC standard opening to a total conical aperture of 85°. It is suitable for both X-ray diffraction  and optical work. The 85° opening is a real advantage for X-ray diffraction experiments, especially for single crystal X-ray diffraction when the DAC often needs to be oscillated at higher angles along the X-ray beam in order to access more reflections.

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.

In the Diacell® HeliosDAC Plus, 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.

A HeliosDAC Plus video presentation available on the Almax easyLab’s YouTube channel.


There is an increasing demand for DACs that will operate at high temperatures. It is generally agreed that above about 1200 K the only realistic option is laser heating. Such installations are complex and expensive. However, for temperatures of up to 1200 K resistive heating is attractive as it is relatively simple.  Therefore, the Diacell® HeliosDAC Plus is perfect for such application.


Cell Material AISI 440C
Anvil Support Plate Tungsten Carbide
Pressure Mechanism Gas Membrane
Maximum Pressure 50 GPa
Temperature Range 1200 K
Top Angle Conical 85º
Bottom Angle Conical 85º
Lateral Access None
Heating Internal gasket heater
Cooling N/A
DAC Diameter 56 mm
DAC Height 38.5 mm
Working Distance to Sample 17.5 mm
Numerical Aperture 0.67
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 Plus

Technical Drawing

Please contact us for further details on the engineering drawings.

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
3.30 mm – 85° Boehler–Almax design diamond anvil
Product code: [P00539]
Anvil Support Plate
Tungsten carbide seat with 85° opening angle
Product code: [P01294]
Gasket Heater 
Heater and type-K thermocouple for Diacell HeliosDAC Plus
Product code: [A59106]
Temperature Controller for Heaters
PS-03– Keithley/Temperature Reader including Labview® based programm
Product code: [A75060]
Gas Membrane
Gas membrane for HeliosDAC Plus
Product code: [A76010]
Gasket Blanks
Inconel gasket blanks, 12 mm diameter, 0.26 mm thick
Product code: [P01293]


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

Culet size (µm) 200 300 400 500 600 800 1000
Pmax (GPa) (*) N/A 87 56 36 25 14 9

(*) 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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