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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

Temperature¹

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
20 K	20 K to 675 K	with PS-HTSTAGE 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
476 K to 675 K	±50 mK	±100 mK

Vacuum

	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:	1.25 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

Sample
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

Utilities
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

Approval:	All instruments CE marked

CPX 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