Overview of the equipments
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We have a TLM 400 top-loading dilution refrigerator system. Together with the refrigerator, there are a series of electronics for monitoring the refrigerator status, lock-in amplifiers, and computer based data collecting system. For the sample fabrication purpose, we have a clean room and a set of equipment to perform operations on the sample.
Comparison of the magnetic field and B/T of our equipment with some National labs.
The dilution refrigerator system and controling electronics. On the right hand side is the dilution refrigerator system. This system can reach a base temperature of 10 mK together with the build-in superconductor magnet's 17 Tesla magnetic field. The electronics include several high-sensitivity lock-in amplifiers, ramp generators, electronic multimeters and current source.
A closer view of the electronics. The left rack is dedicated to sample measurement. From the top to bottom, there are a high precision voltage source, an EG&G 5301A lock-in amplifier, an EG&G 5302 lock-in amplifier, a Keithley 181 nano-voltmeter, a Keithley 617 electrometer and two ramp generators. Behind the rack, there are two Keithley 196 system DMM and two HP3458A multimeters for data collecting. The right hand side rack is mostly for monitoring of the dilution refrigerator system, including temperature, heating and magnet controling units.
The cryostat and sample probe. The big black cylinder is the cryostat of the refrigerator. Detailed inside structures will be featured in later pages. In front of the cryostat, the long and thin tube is the sample probe. The refrigerator has a top-loading into mixture system, therefore we mount the sample to the sample probe and insert the sample probe into the cryostat.
Top view of the cryostat. There are lots of hoses and valves on the top of the cryostat. In this picture, the sample probe is inserted into the cryostat. On the left side is the control panel of 3He circulation system.
The backing pumps. These two pumps do various jobs, including pumping the 1K pot, cleaning the nitrogen cold trap etc. On the control panel, valves and gauges are used to control the gas flow inside the cryostat.