Magnet system with shielded regenerator material

Details Magnet system with shielded regenerator material Magnet system with shielded regenerator material

2006-02-28

2006-02-28

Barrera, Ramon M. (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

C062S051100, C335S216000

Reexamination Certificate

active

07005953

ABSTRACT:
A magnet system with a magnet arrangement (M), a working volume (V) and a pulse tube cooler (P) with magnetic regenerator material (r) is characterized in that a shielding (m) of magnetic material is provided which reduces the stray field of the magnet arrangement at the location of the magnetic regenerator material (r) and is characterized in thatin-line-formulae description="In-line Formulae" end="lead"?⅓|{tilde over (m)}RegR|+|mMagΔx|<⅙|mRegR|,in-line-formulae description="In-line Formulae" end="tail"?wherein mMagis the dipole moment of the magnetic material of the shielding (m), Δχ is the vibration amplitude of the magnetic material of the shielding (m), mRegis the amplitude of the dipole fluctuations of the magnetic regenerator material (r) in one cycle without magnetic shielding (m), {tilde over (m)}Regis the amplitude of the dipole fluctuations of the magnetic regenerator material (r) in one cycle with magnetic shielding (m), and R is the average separation of the magnetic regenerator material (r) from the working volume (V). A magnet system of this type has an optimum stable, temporally constant magnetic field in the working volume (V).

REFERENCES:
patent: 5701744 (1997-12-01), Eckels et al.
patent: 6029458 (2000-02-01), Eckels
patent: 2005/0110602 (2005-05-01), Westphal
patent: 0 905 434 (1999-03-01), None
patent: 0 905 524 (1999-03-01), None

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