< 300 mK familySample-in-vacuum 3He refrigerator - HelioxVT
Whatever your experimental need for variable magnetic field and temperature, the Teslatron™PT Cryofree integrated magnet system has the solution. The wide range of different experimental inserts enables you to configure your measurement platform for cutting-edge applications, such as 2D materials, nano-structures and superconducting devices.
Temperature range: < 1.5 K to 300 K
Standard sample probe temperature stability: ± 0.05 K
System cooldown: ~ 60 hours from room temperature to 4 K (varies with different magnet options)
Standard sample probe cooldown: < 200 minutes from room temperature to < 5 K (probe loaded into cold varaible temperature insert)
Continuous system operation: Typically > 4 weeks
Magnetic field: 8, 9, 12 and 14 T
Magnet ramp to full field: ≤ 60 minutes (varies with different magnet options)
Varaible temperature insert sample space diameter: 50 mm nominal
A typical system comprises of:
Three standard probes compatible with the TeslatronPT:
Each probe is available as Sample-in-Gas (SIG) with a Sample-in-Vacuum (SIV) variant. The probe chassis consists of 3 thin-wall stainless-steel tubes to provide a rigid, straight, low-thermal conductivity structure and create separate electrically isolated spaces to keep measurement looms shielded from diagnostic and drive wiring.
During the process of mounting the sample into the sample holder, the ESD plug will be inserted. This plug links all the electrical connections to the sample together ensuring that no damaging voltages can be generated across the sample due to ESD. This plug remains in place during transport of the sample holder plus sample, meaning the sample could safely be taken from the sample preparation lab to the measurement lab, or even shipped to a lab in another continent safe from ESD damage.
When mounting the sample holder in the probe, the user keeps the ESD plug in place. Then connect the probe to the desired measurement instrumentation via the SPSU. Set the switches of the SPSU to ground all the signal lines to the desired ground, either protective ground or instrument ground. Once the switches are set correctly, remove the ESD plug from the sample holder. If appropriate for the sample the user might run some measurement checks to ensure the sample is connected and the signal train is working. Then the probe can be loaded in the cryostat and cooled to the required temperature.
Once the sample plus probe is inserted in the cryostat and the measurements are in progress, the SPSU can be used as a break-out box to switch or monitor any of the signal lines during the experiment.
The PCB and LCC holders are ceramic Aluminium-Nitride (AlN) to optimise thermal conductivity.
Electrical contact plating is Ni free to minimise the remnant field effects in the sample domain.
The following sample holders are available:
PCB sample holder interface – 44 non-magnetic spring loaded pins to connect to the sample holder PCB
The measurement cable is a carefully specified cable constructed of 13 twisted pairs, 10 pairs of 26 AWG tinned Cu and 3 pairs of 22 AWG tinned Cu. Each pair is individually screened with a foil screen. Each screen has external insulation to isolate it from all the other screens. Each screen also has a drain wire.
In addition, the cable has an overall foil screen which has internal insulation plus an external screen braid. The overall screen also has a drain wire. This construction facilitates overall screening with the outer screen connected to protective ground but in addition any pair can be screened to a specific measurement ground for that channel. This maximises isolation and minimises cross-talk between single pairs.