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CRX-VF Specifications

Sample cooling assembly

Type:	3-stage (sample + magnet + radiation shield)
Radiation shielding:	Magnet radiation shield; main radiation shield with top viewport surrounds sample
Cooling source:	2-stage closed cycle refrigerator (CCR) with 1 W cooling power at 4.2 K

Magnetic field
Magnet type:	Superconducting solenoid
Field of orientation:	Vertical (perpendicular to the sample plane)
Field control:	Current control
Field capability:	±25 kOe (±2.5 T) maximum
Field homogeneity:	0.5% over 10 mm diameter; 1.0% over 25 mm diameter
Landed probe tip movement:	<5 µm full field ramp

Temperature¹

Magnetic field	Temperature range	Configuration
±2.5 T	10 K	Up to 6 probe arms installed
±2 T	11 K to 400 K
±1 T	401 K to 500 K

Control stability

Sample stage temperature	Stability
Base temperature (no heater control)	Not specified
<10 K	±50 mK
10 K to 100 K	±10 mK
101 K to 250 K	±10 mK
251 K to 350 K	±10 mK
351 K to 500 K	±10 mK

	Standard TPS-FRG	PS-HV-CPX option
Pump down time	90 min (to reach <1 × 10^-3 Torr)	30 min (to reach <1 × 10^-3 Torr)
Room temperature	<5 × 10^-4 Torr	<5 × 10^-6 Torr
Base temperature	<1 × 10^-5 Torr	<5 × 10^-7 Torr
Maximum temperature	<1 × 10^-5 Torr	<5 × 10^-7 Torr

Cycle time:	8.5 h
Pump down:	1.5 h
Station cooldown:	5 h
Station warmup:	2 h

Vibration at sample:

<1 µm

Sample
Maximum sample size:	51 mm (2 in) diameter
Sample backside optical access:	Not an option
Sample rotation:	Not an option

Probing configurations
Maximum probes:	6
Probe arm sensor:	Included for monitoring probe temperature
Cooled probe mounts:	<50 K with sample at base temperature
Probe mount:	Thermally anchored to radiation shield
Probe arm:	Thermally anchored to radiation shield
DC/RF probes and DC/RF flexible probes:	Electrical isolation >100 GΩ for low leakage measurements
Microwave probes:	Frequency range DC up to 67 GHz for RF measurements
Fiber optic probes:	Available for electro-optical measurements
Probe landing:	All probes can land at single point in a 25.4 mm (1 in) diameter circle

Cryogen consumption
Room to base temperature (total):	Not required
Helium at 5 K:	Not required

¹Base temperature assumes heat load for probes thermally anchored as listed in the probing section

Station details

Temperature equipment
Sample stage sensor/heater power:	TG-120-CU-HT calibrated GaAs/50 W
Magnet stage sensor/heater power:	CX-1030-CU calibrated Cernox/100 W
Radiation shield sensor/heater power:	DT-670C-CU silicon diode/50 W
CCR 2nd stage sensor/heater power:	DT-670A-CU silicon diode/no active control
CCR 1st stage sensor/heater power:	DT-670C-CU silicon diode/100 W
Probe arm:	DT-670C-SD silicon diode (on one probe arm)/no active control
Electronics console::
Temperature controllers:	Two Model 336s
Magnet power supply:	Model 625
Helium transfer line:	Not required

Included sample holder:	Removable SH-1.25-G, 31.8 mm (1.25 in) maximum sample size, grounded

Station footprint:	800 mm (31.5 in) width × 670 mm (26.4 in) depth (does not include console or CCR compressor)

Vacuum chamber
Material:	Electroless nickel-plated aluminum
Overall size:	280 mm (11 in) outer diameter × 270 mm (10.6 in) tall
Chamber access:	229 mm (9 in) diameter opening
Viewport:	63.5 mm (2.50 in) diameter fused quartz
Viewing area:	54.0 mm (2.13 in) diameter
Pump port:	NW 40 with included vacuum isolation valve
Gauge port:	NW 25
Gas port:	0.25 in NPT with valve
Over pressure safety:	3.5 kPa (0.5 psi) pressure relief valve

Radiation shielding
Material:	Electroless nickel-plated aluminum
Sample access:	203 mm (8 in) diameter lid
Viewport:	50 mm (1.97 in) diameter IR absorbing window
Viewing area:	50 mm (1.97 in) diameter

Vision system

Included kits
Tool kit:	Included tools for standard operation
Spares kit:	Included kit for common consumable items
Probe starter kit:	ZN50R-25-W (qty 2), ZN50R-25-BECU (qty 2), and ZN50R-CVT-25-W (qty 2) for training

Utilities
1-phase voltage:	100/120/220/240 VAC (+5%, -10%), 50/60 Hz
1-phase power:	2 kVA recommended
3-phase voltage (CCR):	200 VAC (50/60 Hz) or 380/400/415 VAC 50 Hz or 480 VAC 60 Hz
3-phase power (CCR):	6.6 to 6.9 kW at 50 Hz; 7.5 to 7.8 kW at 60 Hz
Cooling water power dissipation (CCR):	8.5 kW max; 6.9 kW steady state at 50 Hz; 9.0 kW max; 7.8 kW steady state at 60 Hz