Home > Lake Shore Products > Cryogenic Probe Stations > Model TTP4-1.5 K Cryogenic Probe Station Technical Specifications

Model TTP4-1.5 K Cryogenic Probe Station

Specifications

Temperature

Operating temperature range—overall	1.5 K to 475 K^*
ZN50 DC/RF probe with low RF cryogenic coax cable	1.5 K to 475 K^*
ZN50 DC/RF probe with high RF semirigid coax cable	1.5 K to 400 K^*
GSG microwave probe with semirigid coax cable	1.5 K to 400 K^*

Temperature control (heaters)
1.5 K cold head stage	25 W (2 parallel heaters, 12.5 W each)
4.2 K mid-stage	50 W
Radiation shield	100 W
Probe arm	Measurement only

^*Selectable equipment

Probe Arm Adjustments

Travel
X axis	51 mm (2 in)
Y axis	25 mm (1 in)
Z axis	18 mm (0.7 in)

Translation resolution
X axis	20 µm
Y and Z axes	10 µm
Theta planarization^*	±5°

^*Included with microwave probes

Frequency Range

ZN50 DC/RF probe frequency range
Tungsten with cryogenic coax cable	0 to 50 MHz^*
Tungsten with semirigid coax cable	0 to 1 GHz^*†
Paliney 7 with cryogenic coax cable	0 to 50 MHz^*
Paliney 7 with semirigid coax cable	0 to 1 GHz^*†
BeCu with cryogenic coax cable	0 to 50 MHz^*
BeCu with semirigid coax cable	0 to 1 GHz^*†

GSG microwave probe frequency range
Low frequency with K connector	0 to 40 GHz^*
Mid frequency with 2.4 mm connector	0 to 50 GHz^*
High frequency with 1.8 mm connector	0 to 67 GHz^*
Click here for probe & cable features

^*Selectable equipment
^†S21 > -10 dB up to 1 Ghz, except for a (-40 dB) spike between 400 MHz and 800 MHz depending on probe model and placement; S11 < -3 dB up to 1 GHz

Optical

Optical viewport—located on top lids	Ø54 mm (2.1 in) outer window and Ø51 mm (2 in) inner window
Outer, clear fused quartz	99% IR transmittance
Inner	IR absorbing with narrow band visible light transmittance

Optical resolution—monoscope
7:1 zoom	5 µm
12.5:1 zoom	4 µm^*
16:1 zoom	3 µm^*

^*Selectable equipment

Sample Holder (Chuck)

Maximum sample size—overall	Up to Ø25 mm (1 in)
SH-1.00-G, Grounded chuck	Up to Ø25 mm (1 in) and 475 K
SH-1.00-I, Isolated chuck	Up to Ø25 mm (1 in) and 400 K^*
SH-1.00-C, Coaxial chuck	Up to Ø25 mm (1 in) and 400 K^*
SH-1.00-T, Triaxial chuck	Up to Ø25 mm (1 in) and 400 K^*
Click here to select a sample chuck (holder)

^*Selectable equipment

Standard Equipment

Open cycle sample stage refrigerator	1.5 K to 475 K
1.5 K cold head stage temperature sensor	Lake Shore Model DT-670-SD-1.4H calibrated silicon diode
1.5 K cold head stage heater	25 W (2 parallel heaters, 12.5 W each)
1.5 K cold head stage rotary pump with oil eliminator and hose	14.7 CFM at 60 Hz
4.2 K mid-stage temperature sensor	Lake Shore Model DT-670C-CU silicon diode
4.2 K mid-stage heater	50 W

Cooled radiation shield and cooled IR-absorbing window above the sample
Temperature sensor	Lake Shore Model DT-670C-CU silicon diode
Radiation shield heater	100 W
Removable top lid with viewport	Ø51 mm (2 in) window

Temprature controller	2 Lake Shore Model 332S and one Model 142 200 W (2-channels, 100 W each) power supply (independent regulation of 1.5 K cold head stage, 4.2 K mid-stage, radiation shield, and probe arm temperature monitoring)

Vacuum chamber Diameter	15.2 cm (6 in)
Removable top lid with clear fused quartz viewport	Ø54 mm (2.1 in) window
Probe ports	4 equally spaced surround the sample thermal radiation shield

Machined aluminum base plate	45.7 cm² (18 in²) with four 19.1 cm (7.5 in) legs

Four XYZ precision micro-manipulated probing stages

Probe arms, thermal radiation shields, stainless steel welded bellows, and feedthrough ports

Thermally linked probe mounts	Probe mounts and radiation shield are thermally anchored to the mid-stage; one probe mount includes a platinum temperature sensor installed and wired to a 6-pin feedthrough

Grounded sample holder	SH-1.00-G, accomodates up to a Ø25 mm (1 in) sample with a Ø25 mm (1 in) probe area

Optics Zoom 70 monoscope	7:1 zoom with 5 µm resolution
Color CCD camera
Swing arm	Optics can be manipulated to view any part of the sample or wafer, and can be retracted and swung away to allow access to the top of the vacuum chamber for sample exchange
Video monitor	High resolution, 17-inch
Sample illumination	Coaxial via fiber optic or ring light from an adjustable light source and power supply (must specify sample illumination at time of order) NOTE: Coaxial illumination is recommended for highly reflective materials

High efficiency helium transfer line with foot valve for precise flow regulation

Basic tools, spares, and cleaning kit

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