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Apparatus and method for introduction of a material into a cryogenic system

A low temperature system, low temperature technology, applied in the field of machine readable media

Active Publication Date: 2012-05-16
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, a limitation of this system is that during the condensation portion of the getter cycle, the amount of liquid helium produced is limited by several geometrical considerations, including the mass of the charcoal, the amount of gaseous helium loaded into the charcoal, and the helium being compressed The physical size of the container into which

Method used

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  • Apparatus and method for introduction of a material into a cryogenic system
  • Apparatus and method for introduction of a material into a cryogenic system
  • Apparatus and method for introduction of a material into a cryogenic system

Examples

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example 1

[0033] Example 1: One-way sample loader

[0034] A 2.0 g sample of glycerol was pre-cooled to 77K before being introduced into the airlock 20 of the cryogenic system incorporating the apparatus 1 . The temperature of this sample increases during the loading process, but prior to movement into the sample path 10 the exact temperature of the sample is unknown. The sample is lowered to the balancer 60 where it is allowed to dwell for six minutes. Next, the sample is lowered to a position five centimeters below the positioning balancer 60 and allowed to dwell for six minutes. The sample was then positioned 10 cm below the balancer 60 and allowed to dwell for six minutes. Finally, the sample is inserted into a cryogenic helium bath 72 . exist figure 2 An example of the temperature of the cryogenic helium bath 72 and the temperature of the cooling unit 50 during sample loading is shown in .

example 2

[0035] Example 2: Bidirectional Sample Loader

[0036] A 0.8 g sample of pyruvate was allowed to warm to room temperature (nominal 293K) before introduction into the cryogenic system incorporating Apparatus 1 . The sample is lowered into the balancer 60 where it is held for three minutes. The sample is then lowered 3.75 cm below the balancer 60 where it is held for five seconds, after which the sample is returned to the balancer 60 where it is held for two minutes. This procedure of lowering the sample to and raising the sample from the balancer 60 was repeated in successive steps to depths of 5.00 cm, 5.56 cm, 5.63 cm, and 5.75 cm below the balancer. The sample is then lowered 10 cm below the balancer 60 where it is allowed to rest for two minutes. Finally, the sample is inserted into a cryogenic helium bath 72 . exist image 3 An example of the temperature of the cryogenic helium bath 72 and the temperature of the cooling unit 50 during sample loading is shown in . Usin...

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Abstract

Provided is an apparatus and a method for introducing a sample into a cryogenic system (70), comprising, an airlock chamber (20), a sample path (10) having a first end connected to the airlock chamber and a second end connected to a cryogenic helium bath, an equilibrator (60), inserted into the sample path and positioned between the airlock and the cryogenic bath (72) and which allows for passage of a sample to the cryogenic helium bath, and a cooling unit coupled to the equilibration to control the temperature of the equilibrator. A machine-readable medium, comprising instructions which when executed by a controller causes a sample to be positioned within the cryogenic system, is also provided.

Description

Background technique [0001] Dynamic nuclear polarization (DNP) is a technique that produces an excess of one nuclear spin relative to another orientation. This excess can be on the order of thousands of times at cryogenic temperatures and hundreds of thousands of times at room temperature. An increase in the number of one nuclear spin relative to another is seen as an increase in the signal-to-noise ratio of measurements in a nuclear magnetic resonance (NMR) system, such as a magnetic resonance imager (MRI). [0002] In order to achieve high levels of polarization by DNP, the material or sample must be cooled to extremely low temperatures, typically below four Kelvin, and optimally in the range of one Kelvin. These low temperatures are typically achieved by reducing the pressure on a bulk of liquid helium. As the pressure on the helium bath decreases, the temperature of the bath decreases as defined by the saturation curve for liquid helium. Introducing a warm sample into t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/28F17C13/00G01R33/62
CPCG01R33/307G01R33/62G01R33/282G01R33/31F17C13/001
Inventor A·M·利奇J·R·特里格尔J·A·乌尔巴恩
Owner GENERAL ELECTRIC CO