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EMPX-H2 probe station specifications

Sample cooling assembly

Type:	3-stage flow cryostat (sample + 2 radiation shields)
Radiation shielding:	Partial inner radiation shield; second radiation shield with top viewport surrounds sample
Cooling source:	Liquid helium (LHe) or liquid nitrogen (LN₂)
Magnetic field
Magnet type:	Electromagnet
Field orientation:	Horizontal (parallel to the sample plane)
Field control:	Hall probe installed in station for closed-loop control
Field capability:	±6.0 kOe (±0.6 T)
Field homogeneity:	0.6% over 10 mm diameter; 2.6% over 25 mm diameter
Landed probe tip movement:	<5 µm full field ramp

Temperature¹

Base temperature	Control range	Configuration
4.5 K	5 K to 420 K	Up to 4 probe arms installed
3.2 K	3.3 K to 420 K	with PS-LT option

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

Control stability

Sample stage temperature	Helium stability	Nitrogen stability
Base temperature (no heater control)	±20 mK	±50 mK
<10 K	±50 mK	—
10 K to 100 K	±50 mK	±100 mK
101 K to 250 K	±50 mK	±100 mK
251 K to 420 K	±50 mK	±100 mK

Vacuum

	Standard TPS-FRG
Pump down time	30 min (to reach <1 × 10^-3 Torr)
Room temperature	<5 × 10^-4 Torr
Helium base temperature	<1 × 10^-5 Torr
Maximum temperature	<5 × 10^-3 Torr

Cycle time (LHe):	3 h
Vacuum pump down:	0.5 h
Station cooldown:	1.25 h
Station warmup:	1.25 h

Vibration at sample:

<300 nm standard

Sample
Maximum sample size:	25.4 mm (1 in) diameter
Sample backside optical access:	Not an option
Sample rotation:	Optional 360° rotation stage (PS-360-EMPX)

Probing configurations
Maximum probes:	4 (see orientation diagram)
Probe arm sensor:	Included for monitoring probe temperature
Cooled probe mounts:	<20 K with sample at base temperature
Probe mount:	Thermally anchored to sample stage
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 (1.00 in) diameter circle

Cryogen consumption²
Room to base temperature (total):	10 liquid L helium; 5 liquid L nitrogen
Helium at 5 K:	1 to 2 liquid L/h
Nitrogen at 80 K:	<0.5 liquid L/h

²Assumes maximum number of probe arms installed

EMPX-HF probes are aligned at 30 degree angles

Station details

Temperature equipment
Sample stage sensor/heater power:	CX-1050-CU-HT-1.4M/100 W
Radiation shield sensor/heater power:	DT-670C-CU silicon diode/100 W
2nd radiation shield 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 controller:	Model 336
Warm-up amplifier:	Model 142
Gaussmeter:	Model 475
Magnet power supply:	Model 643
Helium transfer line:	Large bore helium/nitrogen transfer line with flow control 12.7 mm (0.5 in) top port withdrawal
Included sample holder:	Removable SH-1.00-G-EM, 25.4 mm (1 in) maximum sample size, grounded
Station footprint:	914 mm (36 in) width × 660 mm (26 in) depth (does not include console)
Vacuum chamber
Material:	Electroless nickel-plated aluminum
Overall size:	191 mm (7.5 in) × 340 mm (13.4 in) × 292 mm (11.5 in) tall
Chamber access:	133.4 mm (5.25 in) × 243.2 mm (9.58 in) 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:	59 mm (2.3 in) × 157 mm (6.2 in)
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 (EM):	200/208, 220/230, 380, 400/415 VAC (±10%), 50/60 Hz
3-phase power (EM):	5.5 kVA max 50/60 Hz
Cooling water power dissipation (EM):	5 kW max, 50/60 Hz
Total system cooling water power dissipation:	4.25 kW max, 50/60 Hz — see list of available recirculating chillers
Approval:	All instruments CE marked

EMPX-H2 probe station specifications

Sample cooling assembly

Magnetic field

Temperature1

Control stability

Vacuum

Cycle time (LHe):

Vibration at sample:

Sample

Probing configurations

Cryogen consumption2

Station details

Temperature equipment

Included sample holder:

Station footprint:

Vacuum chamber

Radiation shielding

Vision system

Included kits

Utilities

Approval:

Temperature¹

Cryogen consumption²