22
3 Experiment
Fig. 3.1 (a) Schematic diagram of 1K cryostat, (b) Photograph of 1K cryostat in operation
‘insert’ for the 1K cryostat with the experiment mounted at the base of the 1K pot
is shown in Fig. 3.2.
The main experimental setup consisting of a DC SQUID Model 550 chip from
Quantum Design and sample holding geometry is connected to the base of the pot.
To ensure optimal thermalization of the experiment to a desired set temperature, the
SQUID chip assembly is held with a thick chunk of brass. The chunk of brass is then
connected to the base of the pot via three thin C-shaped brass connectors to ensure
optimal thermal conductance. The temperature of the experiment is controlled using
PID tools onboard Lakeshore 340 with the help of a thermometer and heater placed
close to the experiment as shown in Fig. 3.3.The thermometer used in the experiment
is a Lakeshore CERNOX placed close to the sample by mounting it on the brass
3 Experiment
Fig. 3.1 (a) Schematic diagram of 1K cryostat, (b) Photograph of 1K cryostat in operation
‘insert’ for the 1K cryostat with the experiment mounted at the base of the 1K pot
is shown in Fig. 3.2.
The main experimental setup consisting of a DC SQUID Model 550 chip from
Quantum Design and sample holding geometry is connected to the base of the pot.
To ensure optimal thermalization of the experiment to a desired set temperature, the
SQUID chip assembly is held with a thick chunk of brass. The chunk of brass is then
connected to the base of the pot via three thin C-shaped brass connectors to ensure
optimal thermal conductance. The temperature of the experiment is controlled using
PID tools onboard Lakeshore 340 with the help of a thermometer and heater placed
close to the experiment as shown in Fig. 3.3.The thermometer used in the experiment
is a Lakeshore CERNOX placed close to the sample by mounting it on the brass