16 (107) BRUKER CryoProbe User Manual
System description
Where applicable, the CryoPreamps, transmit/receive switches, RF filters for the
receiver pathways, and control circuits are built into the CryoProbe body.
The CryoProbe is connected to the CryoPlatform with the standardized CryoCou-
pler and He Transferline for cooling as well as with several sensor cables. It re-
quires special interface cables for the z-gradient and for the VT unit.
Technical data
Dimensions 190 × 365 × 95 mm [w × d × h]
(body only, excluding connectors)
length including front connectors: 383 mm
Overall height 578 mm (500 MHz), 628 mm (600 MHz)
Weight ~12 kg
Sample temperature control 3.1.1
The sample is kept at a temperature in a range specified on the ‘L
IMITATIONS -
W
ARNINGS’ sheet which comes together with each individual probe. Its tempera-
ture is controlled and regulated in the usual way with a continuous gas flow. There
is a vacuum insulation between sample and cryogenically cooled NMR coil as-
sembly. Still, due to thermal radiation a slight steady cooling acts on the sample
from the surrounding CryoProbe cavity. This cooling, however, is easily compen-
sated by the regular VT gas flow.
Note the "Sample temperature control" on page 55
.
Reproducibility 3.1.2
The performance characteristics of a CryoProbe do not change significantly with
time. Warm-up/cool-down cycles are of little effect on shim values, tuning &
matching, pulse angles, lineshape, or sensitivity. However, some fine tuning of
parameters might be necessary comparable to what is known from conventional
probes.
Differences to a conventional probe 3.1.3
Although the CryoProbe is in a way a regular high-resolution NMR probe, many of
its systems are unique and have not been used in an NMR system before. All us-
ers of a CryoProbe System must be aware of its differences to a conventional
probe to ensure appropriate use and maximum performance.
Mounting
The CryoProbe includes fragile parts and needs very careful handling. Since sev-
eral electronic components (e.g. preamplifier) and parts of the cooling system are
included in the CryoProbe, the weight is substantially increased as compared to
conventional probes. A special Mounting Hardware is attached directly to the
magnet bottom to carry the CryoProbe. Two people are needed for the actual lift-
ing of the heavy CryoProbe (~12 kg) into the magnet.
To Next Page
Loading...
Need help?
General
