Diacell® CCS-DAC System
Optical and X-ray spectroscopy, Cryostat with integrated DAC, Pmax = 100 GPa, Tmin = 10 K
- The Diacell® CCS-DAC enables experiments up to above 50 GPa and down to temperatures of about 10 K
- The system combines and fully integrates a Diacell® Bragg-LT(G) or OmniDAC-LT diamond anvil cell to the Janis CCS-100/204 bench top optical cryostat
- The closed-cycle cryostat is based on a SHI cold head and features electrical feedthrough, optical vacuum shroud and radiation shield (f 1.0 optics), integrated gas membrane line and specific DAC holder
- Various window materials are possible, such as Mylar, quartz or combination of both
- Options: Temperature controller, Turbo pump system, RubyLUX fluorescence, Mounting breadboard for horizontal mounting, automated XYZ stage for RubyLUX
Description
Cryocooler-based cryostat, Janis Model CCS-100/204, with integrated DAC.
This turn-key low temperature and high pressure diamond anvil cell system is extremely simple to use. The nominal temperature range is about 10 K up to 325 K, although lower temperatures are achievable.
This is essentially a bench-top cryostat and high pressure system, which is ideal for scattering as well as optical work.
The second stage cold finger comes with a 38 mm diameter copper sample mount, 50 ohm control heater, and silicon diode temperature sensor.
A special large-diameter optical radiation shield mounted on first stage is also included. The standard optical vacuum shroud is four (4) 41.4 mm diameter clear view windows. Various windows materials are possible, such as fused silica and mylar, for example.
The cryostat’s instrumentation skirt includes one 10-pin electrical feedthrough for heater and temperature sensors, one o-ring compression seal port, one blank feedthrough port, evacuation valve and safety pressure relief valve.
A special sample holder to fit either Bragg-LT(G) or OmniDAC-LT cells and integrated gas line to enable gas membrane DAC operation are also included. Naturally, other cells from our range may be accommodated.
Options for the Diacell® CCS-DAC System include:
♦ An integrated Optiprexx RubyLux system automated for ruby fluorescence manometry at low temperatures, including laser, transfer optics, spectrometer and fibre optic.
♦ A model 335 single loop temperature controller with cable to cryostat.
Specifications
| Cryostat model | Janis Model CCS-100/204 |
| Cryostat type | High Purity Helium closed-cycle refrigerator |
| Temperature Range | 10 K – 325 K |
| Compressor | Helium with ~3 meter gas lines ; water cooled |
| Sample access | Standard optical vacuum shroud with four 41.4 mm diameter clear |
| Window materials available | Quartz or Mylar or Calcium Fluoride |
| Spare access ports | One blank feedthrough port |
| Safety | Evacuation valve and safety pressure relief |
| Integrated Diamond Anvil Cell | OmniDAC-LT or CryoDAC-Nitro or Bragg-LT(G) (or equivalent) |
| DAC Pressure Mechanism | Gas Membrane |
| Maximum Pressure | According to the integrated DAC detailed technical specifications |
| Measurements Access Angles | According to the integrated 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 CCS-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.
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Temperature controller Temperature controller, Model 335 from Lakeshore (or equivalent) with cable to connect to cryostat Product code: [P01491] |
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Pumping System Turbo pump with its controller Product code: [A95050] |
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Breadboard Optical Breadboard with cryostat mounting bracket Product code: [A95020] |
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Automated Stages with Controlling Hub 3 motorised translation stages and controllers providing a full 50 mm motion of the RubyLUX optical system Product code: [A95030_A95040] |
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Gas Membrane Spare gas membrane enabling enabling the use of the DAC outside the cryostat Product code: [depending on the DAC] |
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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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