EMPX-H2 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


Base temperature Control range Configuration
4.5 K 5 K to 400 K Up to 4 probe arms installed
3.2 K 3.3 K to 400 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 400 K ±50 mK ±100 mK


  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


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


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


Back to the EMPX-H2 overview

Probing configurations

Vision system

Recirculating chillers