An improved dewar design that accelerates the manufacturing process of a dewar.

This NMR device (10) has: a dewar (12) that houses liquid helium; a superconducting magnet disposed in the dewar (12); and a heat shield tank (16) disposed in a manner so as to encircle the dewar (12).

The self-pressurization is achieved by ambient heating of the dewar's contents.

In a Dewar cryosauna liquid nitrogen is fed directly from a 40-litre non-pressurized tank called a Dewar tank.

The pressure may be provided by supplying lightly pressurized air into the dewar, by heating a small portion of the nitrogen in the dewar, or with a small low pressure pump.

A hermetically isolated liquefaction chamber is disposed within the neck of the Dewar.

A cryogenic cooler (10) includes a dewar (14) spaced from a cold finger (12).

The oversized evacuation port, however, does not result in an increase in the overall size or profile of the dewar.

In a preferred embodiment, the dewar includes an evacution port that may be larger in size by a factor of ten over the size of evacuation ports of conventional dewars.

In another feature of this invention, cryogen velocity is derived from a self-pressurized dewar containing a saturated cryogen.

The Dewar neck design reduces the entrapment of nitrogen gas bubbles and its shape prevents the spilling of liquid nitrogen at high tilt angles.

This can reduce quenches and helium losses which can occur during the transfer of liquid helium from the dewar to the superconductive magnet.

A liquefier includes a Dewar having a storage portion and a neck portion extending therefrom.

Conduction: through the use of a bottle nested within another (see dewar) separated by vacuum.

In chemistry laboratories, liquid nitrogen is often stored in large thermos-like containers called “dewars.