Diacell® PT-DAC System

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Optical and X-ray Spectroscopy, Cryostat with integrated DAC, Pmax = 100 GPa, Tmin = 5 K

The Diacell® PT-DAC enables experiments up to above 100 GPa and down to temperatures of less than 5 K
The system combines and fully integrates a Diacell® Bragg-LT(G) or OmniDAC-LT diamond anvil cell to the Janis Model PTSHI-950-5 top-loading optical cryostat
The DAC sits in the sample tube of the cryostat, where it is cooled (via exchange gas) by a Sumitomo SRP-062B two stage pulse-tube cold head with 0.5 W cooling at 4.2 K the second stage
Low vibration levels are achieved by vibration isolation braids between the first and second stages of the pulse tube cooler and the cryostat body
Small footprint: the overall dimensions are just 0.4 m diameter by 1.0 m height approximately
Options: an integrated Optiprexx RubyLux system automated for ruby fluorescence and a temperature controller

SKU: A92000

For more info, quotation or call: Contact us

Description

Turn-key fully integrated low temperature cryostat and diamond anvil cell system.

Almax easyLab, in collaboration with Janis Research Company Inc. (Janis), developed a turn-key integrated solution for researchers seeking to perform high pressure experiments at low temperatures.

By combining and fully integrating the Diacell® OmniDAC-LT diamond anvil cell (DAC) with a pulse-tube-based Janis Model PTSHI-950-5 top-loading optical cryostat researchers have a turn-key platform in which to carry out optical and scattering experiments up to above 100 GPa and down to temperatures of the order of 5 K.

The DAC sits in the sample tube of the cryostat, where it is cooled (via exchange gas) by a Sumitomo SRP-062B two-stage pulse-tube cold head with 0.5 W cooling at 4.2 K at the second stage. Optical access is through fused silica windows (other materials available upon request). Low vibration levels are achieved by vibration isolation braids between the first and second stages of the pulse-tube cooler and the cryostat body.

The system has a small footprint. The overall dimensions are just 0.4 m diameter by 1.0 m height approximately. The water-cooled compressor comes with a full charge of high-purity helium gas. The power requirements are 7.5 kW, either 200 VAC 60 Hz or 380 – 415 VAC 50 Hz, 3-phase. The water cooling requirements are 6.8-9l/min @ 5-25°C @ 8 bar maximum.

If you would like to discuss this system in more detail, please contact us.

Applications

This versatile low temperature and high pressure platform may be used for a variety of research techniques, including (but not limited to) spectroscopy, scattering, transport, and magnetic measurements.

Specifications

Cryostat model	Janis Model PTSHI-950-5
Cryostat type	Pulse Tube Cryocooler
Temperature Range	5 K
Compressor	High-purity helium gas; water-cooled
Sample access	Two optical windows
Window material	Fused silica
Low vibration level	Vibration isolation braids
Safety	Evacuation valve and safety pressure relief
Integrated Diamond Anvil Cell	OmniDAC-LT or Bragg LT(G)
DAC Pressure Mechanism	Gas Membrane
Maximum Pressure	According to DAC detailed technical specifications
Measurements Access Angles	According to DAC detailed technical specifications

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 PT-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.

	Temperature controller Temperature controller, Model 335 from Lakeshore (or equivalent) with cable to connect to cryostat Product code: [P01491]
	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: [depending on the DAC]
	DAC Screw Ring Spare DAC screw ring enabling the use of the DAC outside the cryostat Product code: [depending on the DAC]

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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