LT3M Helium Flow Cryostat
The ARS manufactured LT3M is an extended length true UHV cold head (10-11 Torr) where all of the rubber o-ring seals have been replaced with welded joints and metal seals.
The LT3M is ideal for UHV surface science where very long cold fingers are required. The LT3M has a customizable length up to 1200 mm and a rigid support tube to allow for cleaving and manipulation. The upturned feedthroughs limit the rotational footprint to just 4.8 in.
Like all of our LT3 liquid helium flow cryostats, the LT3M is an advanced liquid helium flow cryostat utilizing many unique features, such as the Matrix heat exchanger and the co-axial shield flow transfer line, to achieve unparalleled efficiency and vibration levels.
Applications
UHV - XYZ manipulation and rotation
Surface science
Molecular beam epitaxy (MBE)
Photo emission spectroscopy (PES)
Photoemission electron microscope (PEEM)
Typical Configuration
Cold head (LT3M)
Co-axial shield flow liquid helium transfer line
True UHV welded stainless steel instrumentation skirt with 4.5 in. rotatable CF flange
Stainless steel support tube
Dewar adapter
Flow meter panel for helium flow control and optimization
Nickel plated OFHC copper radiation shield terminating 0.125" short of the cold tip
Instrumentation for temperature measurement and control:
10 pin UHV feedthrough
36 ohm thermofoil heater
Silicon diode sensor curve matched to (± 0.5 K) for control
Calibrated silicon diode sensor (±12 mK) with 4 inch free length for accurate sample measurement
Wiring for electrical experiments:
10 pin feedthrough
4 copper wires
Sample holder for optical and electrical experiments
Temperature controller
Features
1200 mm customizable length
4.8" rotational footprint
True UHV (10-11 Torr)
Bakeable
Open sample space
Optional cold tip extensions
Liquid helium flow
Matrix heat exchanger
Co-axial shield flow
Precision flow control
Exhaust heater
Operation in any orientation
Fully customizable
Options & Upgrades
High flow transfer line
6 in. rotatable CF flanges available.
Custom temperature sensor configuration (please contact our sales staff)
Custom wiring configurations (please contact our sales staff)
Sample holder upgrades (custom sample holders available)