CRYOGEN-FREE Models

Leiden Cryogenics B.V.
Kenauweg 11
2331 BA Leiden
The Netherlands
CRYOGEN-FREE
Models
Tel: +31 71 5721824
Fax: +31 71 5722734
www.leidencryogenics.com
info@leidencryogenics.com
CRYOGEN-FREE Models:
• CF-200
• CF-450
• CF-650
• CF-800-MagLev
• CF-1200-MagLev
CRYOGEN-FREE
Models
Figure 1
CF-DR Models
CF-200
CF-450
CF-650
CF-800-Maglev
CF-1200-Maglev
Tmin (mK) Q @120mK (µW)
<30
<15
<10
<8
<7
Very low vibrations
The vibrations were measured on the
mixing chamber plate of a LC CryogenFree dilution unit and plotted in figure 1.
The spectrum was taken during the
operation of the PT compressor and with
the compressor switched off. We
compared the results with measurements
done on a ADR-PT unit.
200
450
650
800
1200
High Cooling Power
The cooling power of the mixing chamber
(MC) of a CF model 650 compared to the
cooling power of the probe. The red dots
show the cooling power of the MC when
the heat is applied on the MC self. The
blue triangles show the same but heat
being applied to the probe . Green
triangles and black squares show the
cooling power respectively of a non coldremovable probe, and of a coldremovable one.
Technical specifications of the CF Models CF-200/450/650/800/1200
- DR unit with 340mm mixing chamber plate. Due to the rubust design, the CF units
provide a very stable, low vibration construction (see figure 1). The cool-down time is
little over 30 hours, which can be reduced to 20 hours using liquid nitrogen pre-cooling
- Joule-Thompson heat exchanger to condense the mixture, followed by a continuous and
sintered heat exchanger
- Double 3He condensing circuit
- Pt resistance thermometers on the 50K and 3K plate, RuO thermometers on the still and
3K sorb pump. Calibrated Speer resistance thermometers on the mixing chamber plate.
-Up to three 50mm clear shot tubes down to the 3K plate, with the middle one being
standard.
Figure 2
Drawing of the CF with
insertable probe and 10
Tesla magnet attached to
the still shield
Picture of the CF with 10
Tesla magnet attached to
the still shield
Picture of the insertable probe
- Optional top-loading probes for quick sample change (see figure 2 for cooling power
probe)
- Possibility of inserting the probe into a magnet (up to 9 Tesla), placed on the still shield
or the IVC shield. Vector magnets either XY or XYZ are also available
Oil-free compact Gas Handling System (GHS)
- Ceramic-bearing turbo pumps mounted inside of the cabinet, backed by a dry scoll
pump.
- Two external nitrogen cold traps including nitrogen dewar.
- Two helium traps in thermal contact with the PTR.
- A roughing vacuum pump for the IVC and OVC.
- A triple power supply for still, mixing chamber and sorb pumps provided with LabView
drivers
- Microprocessor controlled valve panel.
- 550mm OD OVC with tripod.
- Laptop computer with automatization programs and suitable interfaces
Main dimensions of the CF model.
View of a CF model with a 9-3 vector magnet