Bruker CryoProbe User Manual

CryoPlatform
CryoProbe User Manual BRUKER 17 (107)
Connections
There are more connectors on the CryoProbe than on a conventional probe due
to the built-in preamplifiers and the necessary control circuits (see Figure 3.1.
).
Sample handling, tuning, shimming
There are no differences to a conventional probe with regard to sample handling,
sample lift, and sample spinning. Samples with a diameter smaller than specified
can be used like in conventional probes.
A CryoProbe is tuned and matched like a conventional probe with actuators from
below. Before the usual wobb feature of X
WIN-NMR can be used, the appropriate
RF pathway must be enabled with the command crpwobb. CryoProbes must not
be tuned or matched when warm!
Established shimming strategies are still valid and no unusual shim settings are to
be expected.
RF power
RF peak and average power must not exceed certain limits. Due to the high effi-
ciency of the CryoProbe, the limits are lower than for conventional probes. Power
levels for all kinds of RF pulses (hard, soft, shaped, CPD, spin-lock...) may be sig-
nificantly lower than on conventional probes. In particular, the decoupling power
required for a given RF field strength is usually much smaller than in a conven-
tional probe. See the specific L
IMITATIONS - WARNINGS sheet, which is delivered
with each CryoProbe.
Length and power of RF pulses are calibrated as usual.
Sample temperature and minimum required VT gas flow
The sample is subjected to a rather high flow of VT gas specified on the ‘L
IMITA-
TIONS - WARNINGS’ sheet which comes together with each individual probe. The
VT gas flow must be maintained at all times. This compensates for the slight cool-
ing due to thermal radiation from the surrounding CryoProbe.
Subsequent modifications
No modifications, upgrades, or frequency changes are possible for an existing
CryoProbe.
Acoustic noise
The CryoPlatform includes several mechanical pumps and compressors which
are sources of acoustic noise. A characteristic periodic hiss of the Gifford-McMa-
hon cooler is clearly audible from the CryoCooling Unit and the Flexlines despite
their acoustic insulation. The He Compressor and an optional water chiller are
also noisy but can conveniently be located in an adjacent room.
CryoPlatform 3.2
0
The CryoPlatform™ is required once per spectrometer and supplies the entire in-
frastructure for the operation of CryoProbes, i.e. the cooling and all control func-
tions. It is a push-button system which performs all operations needed for an
entirely automatic cool-down, cold operation, and warm-up of the probe. Although

Bruker CryoProbe Specifications

General

Brand	Bruker
Model	CryoProbe
Category	Laboratory Equipment
Language	English