Bruker Biospin Gmbh | Date: 2016-09-16
A cryostat includes a magnet arrangement for the generation of a magnetic field B0, the magnet arrangement comprising an LTS portion having at least one LTS section made from a conventional low-temperature superconductor and an HTS portion having at least one HTS section made from a high-temperature superconductor. The HTS portion is arranged radially within the LTS portion, and the cryostat is designed to control the temperature of the LTS portion and the HTS portion independently of one another, wherein the HTS portion is electrically isolated from the LTS portion, and is designed to be superconductingly short-circuited. The invention proposes a cryostat with magnet arrangement which enables a high magnetic field strength in a compact space and, at the same time, can be easily constructed.
Bruker Biospin Gmbh | Date: 2016-08-01
A method is provided for precooling a cryostat having a hollow cold head turret into which a neck tube protrudes and connects an object to be cooled to the exterior of the cryostat, wherein a cold head having a cold head stage for cooling a cryogenic working medium may be introduced into the neck tube. During a condensation operation the cryogenic working medium flows through a heat pipe into an evaporator chamber which is thermally conductively connected to the object to be cooled. During a precooling phase a precisely fitting, thermally conductive short circuit block is inserted through the neck tube into the heat pipe to provide thermal conduction between the object to be cooled and a cooling device The short circuit block is removed from the heat pipe after the target temperature is reached, and heat is subsequently transmitted through the heat pipe during a condensation operation.
Bruker Biospin Gmbh | Date: 2016-10-19
A spectroscopic method for calculating a limit of quantification and a relative error includes: 1. selecting an error function F(C); 2. providing a blank spectrum; 3. recording a reference spectrum with a signal content of the substance being investigated; 4. determining start concentrations; 5.a. multiplying the reference spectrum with the signal content of the substance by a factor; 5.b. adding the resulting spectrum to the blank spectrum and determining the corresponding concentration of the substance and calculating the corresponding relative error; 6. iteratively adapting parameters of the selected error function F(C): recording a measurement spectrum of the test sample and determining the concentration of the substance being investigated using 5.b. and comparing with the calculated limit of quantification and calculating the relative error by applying the error function from step 6.
Bruker Biospin Gmbh | Date: 2016-03-31
A nuclear magnetic resonance-magic angle spinning (NMR-MAS) turbine assembly has a MAS rotor with turbine cap having a stopper region and a turbine region. The stopper region allows feeding into a rotor tube and has at least one sealing section for resting against an inner wall of the rotor tube. The turbine region has a collar section for resting against a face side of the rotor tube and a turbine section that forms the turbine blades, which protrude axially from the collar section without extending radially further than the collar section. The arrangement of the rotor allows for very high rotation frequencies that, correspondingly, reduce line broadening in NMR measurements.
Bruker Biospin Gmbh | Date: 2016-10-27
A pipetting device (2) for removing fluid from a sample vessel (52) includes a pipetting needle (4) and an auxiliary cannula (18) for piercing a septum, designed to guide the pipetting needle axially through the auxiliary cannula. The pipetting device has a guide arm (6), on the lower end (10) of which is arranged an end plate (12) that is axially displaceable along the guide arm against a resilient resistance. A centering device (14) inserts into the end plate of the guide arm, and at least three centering fingers (26) with conical bevels (34) are constructed on the radial outside of the centering device, distributed around the circumference thereof, and forming a holding-down device for the sample vessel. The disclosed construction makes possible to reliably pierce the septum of a sample vessel and to easily pull the pipetting needle out of the septum again even with thin pipetting needles.
Bruker Biospin Gmbh | Date: 2017-01-27
A connecting device in a pulse tube cooler system branches such that a first line branch (11) has a first flexible line segment (4a) and a second line branch (12) has a second flexible line segment (4b), the flexible line segments being arranged in parallel with and offset from one another. The flexible line segments each have a front segment end (17, 18) and a rear segment end (19, 20), the front segment end (17) of the first flexible line segment (4a) and the rear segment end (20) of the second flexible line segment (4b) are rigidly connected to one another, the rear segment end (19) of the first flexible line segment (4a) and the front segment end (18) of the second flexible line segment (4b) are rigidly connected to one another, and there is no continuous rigid connection between the control valve and the cold head.
Bruker Biospin Gmbh | Date: 2016-06-28
A cryostat arrangement has an outer jacket, a first tank with a first cryogen, and a second tank with a second liquid cryogen which boils at a higher temperature than the first cryogen. The first tank comprises a neck tube, whose hot upper end is connected to the outer jacket at ambient temperature and whose cold lower end is connected to the first tank at a cryogenic temperature. The arrangement uses a riser pipe protruding into the second tank through which the second liquid cryogen can flow out of the second tank and into a first heat exchanger in thermal contact with the neck tube. An outflow line is provided through which second cryogen evaporating from the first heat exchanger can flow out and into an optional second heat exchanger. It is thus possible to greatly reduce heat input from the neck tube into the first tank.
Bruker Biospin Gmbh | Date: 2016-03-16
Monitoring cell (100) for performing an NMR measurement of a reaction fluid. The monitoring cell (100) has a hollow NMR sample probe (110) for receiving the reaction fluid. Inlet and outlet transport capillaries (112, 123) transport the reaction fluid to and from the sample probe (110). A feed line (306) and return line transport a temperature control fluid to and from the monitoring cell (100). An adapter head (108) couples the transport capillaries (112, 123) to the sample probe (110) and removably connects the sample probe (110) to an adapter section (106). The transport capillaries (112, 123) are positioned within the feed line (306) in parallel to one another. The feed and the return lines (306, 358) are attached to the adapter section (106) such that a reversal of the temperature control fluid stream occurs in the adapter section (106).
Bruker Biospin Gmbh | Date: 2016-03-08
A microwave resonator for an EPR probe head has a metal cavity body (1) supporting an electromagnetic microwave resonance mode. The metal cavity body (1) has an opening for inserting a sample tube (2) to a center position of the resonator. The center of the opening and the center position of the resonator define an x-axis. The cavity body also has an opening for transmitting microwave radiation into the resonator. Two dielectric elements (4a, 4b) are located symmetrically to the E-field nodal plane containing the x-axis and a z-axis perpendicular to the x-axis. Each dielectric element is geometrically formed and positioned such that it provides an equal overlap with a local maximum of the microwave electric field energy. The microwave resonant cavity has a thin planar shape and the resonator is loaded with two dielectric elements, placed symmetrically relative to the central EPR sample.
Bruker Biospin Gmbh | Date: 2016-09-21
A microwave resonator for an EPR probehead comprising a metal cavity body (1) supporting an electromagnetic microwave resonance mode having an even number of local maxima of microwave energy, an opening for inserting a sample tube (2) to a center position of the resonator, the center of the opening and the center position of the resonator defining an x-axis, an opening for transmitting microwave radiation into the resonator, two identical dielectric elements (4a,4b) located symmetrically to the E-field nodal plane containing the x-axis and a z-axis perpendicular to the x-axis, is characterized in that each dielectric element is geometrically formed and positioned such that it provides an equal overlap with a local maximum of the microwave electric field energy. Such microwave resonant cavity has thin planar shape for an EPR probehead. The resonator is loaded with two dielectric elements, of identical shape and physical properties, placed symmetrically relative to the central EPR sample. When included in a probehead, this resonator is also contained by the mirror symmetry plane between the main magnet poles.