Controlled, simple and fast cryogenic measurements.
The CryoLab is designed to perform rapid SQUID or (superconducting) sample characterisation measurements from room temperature down to cryogenics in a fully automated manner. Doing measurements doesn’t require any experience or know-how on cryogenics, vacuum technology or thermodynamics from the user.
Chalmers University of Technology, together with partners in Karolinska Institute, Uppsala and Stockholm Universities, and Acreo Swedish ICT AB, is developing a magnetic immunoassay system for rapid detection of pandemic influenza diseases. This project is supported by Knut and Alice Wallenberg foundation.
” The magnetic immunoassay system is based on a high-Tc SQUID gradiometer and cryocoolant-free refrigerator system. We have shown successful operation of a bicrystal high-Tc SQUID gradiometer placed in the CryoLab MSG system with base temperature of 75 K. Measurements of SQUID current-voltage and voltage-flux characteristics are performed and compared with ones in a LN2 cryostat. Magnetic flux noise of the SQUID is recorded in both dc and ac-bias modes in an unshielded environment. All SQUID parameters such as critical current, voltage modulation are not affected by the presence of The CryoLab. We have also performed noise measurements of the system using a SQUID placed in different positions outside the CryoLab system which showed no influence of The CryoLab on the SQUID magnetic flux noise. “
The CryoLab MSG is a desktop system where all the required hardware is fully integrated inside a small casing. All connections to and from the CryoLab, both gas and electrical, are made using quick connects.
System at a glance
1. KF40 quick release vacuum clamp
2. Stainless steel vacuum chamber
3. User panel
4. On / Off switch
5. User display
6. USB connection
7. N2 gas quick connections
8. N2 gas pressure sensor connections
9. Gas line security hook
10. Power connection
11. SQUID electronics slide
12. Serial number and CE information
Controllable temperature: 75 – 298 Kelvin
Net cooling power*: 75 mW @ 80 Kelvin
Typical cool-down time: 30 minutes to 75 K
Typical heat-up time: 15 minutes to room temperature
Temperature stability: ± 50 mK
Compatible with both SQUIDs and gradiometers
* Net means that this is fully available for the user. All parasitic heat losses, including heat conduction though wires, is deducted from the gross cooling power.
No integrated vacuum pump for magnetic sensitive applications. External vacuum pump has to be connected.
Vacuum connection: KF40 flange
Max. vacuum pressure during operation: 1 x 10e-3 mbar
PCB with 4 user leads & bond/solder pads.
Sample to PCB thermal connection via glueing (e.g. GE varnish / silver paint).
Sample to PCB electronic lead connections via soldering or bonding.
Resistance from signal connector to PCB bond/solder pad: ~ 7 Ω
Maximum allowable voltage: 20 V
Maximum allowable current: 20 mA
Maximum sample size: 10 mm x 10 mm
CryoVision is the software package to control the CryoLab from a PC and is included with all systems. Although The CryoLab can be fully operated as a stand-alone apparatus, with CryoVision you are able to control the system in more detail. You can see all parameters in a glance, switch between single set-point and programs. Create, edit and save programs and export your data.
System requirements for CryoVision stand-alone program: Windows™ 7 or later.
Sub-VIs for temperature control or parameter read-out: LabView 8.0 or higher
Temperature control: single setpoint / programs / external
Manual or automated PID tuning
Direct bottle-, vacuum- and gas-line pressure monitoring
CryoVision Monitor via TCP/Web Server
LabView subVIs to read or read/control current temperature
Automated software and firmware internet updates
Keep track of your cool-down measurements on your mobile devices using CryoVision Monitor.
The CryoLab is designed in such a way that its user requires absolutely no know-how on cryogenics or vacuum technology to operate this system. All procedures including cool-down, sample exchange and bottle replacement are fully automated and controlled by the system. Wires to and from your sample is integrated within the mounting carriers so you don’t have to worry about any parasitic heat losses.
This video shows in detail how to do measurements with the CryoLab MSG for SQUIDs.
SQUID Attachment & Signal Readout.
The CryoLab MSG can cool down samples to 75 Kelvin in a plug-and-play manner. The vacuum housing can be either stainless steel or a plastic. Fully customised vacuum housing is available on request.
All connections required for the cooling, vacuum and SQUID sensor readout are made via quick connects.
A SQUID is connected to the CryoLab using a SQUID sample carrier to which all electrical connection can be made (soldered or wire bonded). Four connections are available for the SQUID.
The cooler platform without a SQUID attached. All protection around the cooler is made from plastic material which is SQUID compatible.
Mounted carrier with SQUID.
Once the SQUID is connected (glued) to the carrier it can be attached to the cooler (e.g. using silver paint).
At the bottom of the protective ring a cavity is situated to place a small feedback or input coil.
The CryoLab MSG is compatible with the SQUID Electronics from Supracon and Magnicon. Compatibility with other SQUID electronics is available on request.
The read-out device of the SQUID electronics system is simply slit into the back of the system where it is internally routed to the carrier of the mounted SQUID. This way the distance from electronics to SQUID is minimized. Both the cable from the flange to the slider and the carrier PCB are shielded and twisted (in pairs) to minimize noise.
SQUID Electronics from Supracon and Magnicon.
Slider input for SQUID Electronics.
KF40 flange for connection to a vacuum pump.
Quick connect for gas bottle.
SQUID Measurement example
Courtesy of Chalmers University Sweden
HTS SQUID mounted to the CryoLab MSG system.
Figure 1. R-T measurement of a SQUID using Kryoz OEM MSG system.
Figure 2. I-V characteristic obtained at 75.8 Kevin.
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