CPX Specifications

Sample cooling assembly 

Type: Type: 1 + 3-stage split flow cryostat (sample + 3 radiation shields); dual exhaust ports with independent flow control of sample and shields
Radiation shielding: Inner 4 K (partial) radiation shield; main radiation shield with top viewport surrounds sample; outer second (partial) radiation shield
Cooling source: Liquid helium (LHe) or liquid nitrogen (LN2)

Magnetic field:

Ring magnet kit


Base temperature Control range Configuration
4.3 K 4.4 K to 475 K Up to 6 probe arms installed
1.9 K 2 K to 475 K with PS-LT option
1.6 K 1.65 K to 400 K with PS-VLT-CPX option
10 K 10 K to 400 K with PS-LL-CPX 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) ±15 mK ±20 mK
<10 K ±50 mK
10 K to 100 K ±20 mK ±50 mK
101 K to 250 K ±15 mK ±50 mK
251 K to 350 K ±15 mK ±100 mK
351 K to 475 K ±50 mK ±100 mK


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

Cycle time (LHe):

3 h
Vacuum pump down: 0.5 h
Station cooldown: 1.25 h
Station warmup: 2 h
Load-lock sample exchange: 1 h with PS-LL-CPX option

Vibration at sample

Standard PS-PVIS option
X axis <300 nm (11.8 µin) <30 nm (1.18 µin)
Y axis
Z axis


Maximum sample size: 51 mm (2 in) diameter
25.4 mm (1 in) diameter with PS-VLT-CPX option
25.4 mm (1 in) diameter with PS-LL-CPX option
Sample backside optical access: Not an option
Sample rotation: ±5° in-plane rotation

Probing configurations

Maximum probes: 6
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 or 4 K 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 (1.00 in) diameter circle

Cryogen consumption2

Room to base temperature (total): 10 to 15 liquid L helium; 4 to 5 liquid L nitrogen
Helium at 5 K: 1 liquid L/h
Nitrogen at 80 K: <0.5 liquid L/h

2Assumes maximum number of probe arms installed

Station details

Temperature equipment

Sample stage sensor/heater power: DT-670-CU-HT calibrated silicon diode/50 W
(PS-VLT sensor optimized for <4 K) CX-1050-CU-HT-1.4M calibrated Cernox/50 W
4 K radiation shield sensor/heater power: DT-670C-CU silicon diode/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/50 W
Probe arm: DT-670C-SD silicon diode (on one probe arm)/no active control
Electronics console:
Temperature controllers: Two Model 336s
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-1.25-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 instrument console)

Vacuum chamber

Material: Electroless nickel-plated aluminum
Overall size: 280 mm (11 in) outer diameter × 343 mm (13.5 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 (two ports)
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: 167 mm (6.6 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


1-phase voltage: 100/120/220/240 VAC (+5%, -10%), 50/60 Hz
1-phase power: 2 kVA recommended
3-phase voltage: Not required
3-phase power: Not required
Cooling water: Not required


Back to the CPX overview

Probing configurations

Vision system