SuperVariMag Systems

The standard SuperVariMag systems offer magnetic fields of 6-9 Tesla (niobium titanium coils) and 10–14 T (niobium tin coils), sample tubes of 1.0"-1.5" diameter and a 20 liter useful capacity open neck helium reservoir in a vapor shielded superinsulated dewar. While the standard systems offer a vertical magnetic field, split pair coils along with double or triple coil configurations are also offered in various field strengths for horizontal field directions or rotating vector fields. Please contact Janis for a list of available designs or for a custom designed magnet system.

SuperVariMag systems can also be supplied in larger helium capacity dewars, where a "belly" in the helium reservoir provides an increased helium capacity above the magnet. They can also be supplied in an ultra low loss (ULL) cryostat that offers a static loss rate between 4 and 5 liters a day, with the magnet and variable temperature insert in position. The high efficiency systems usually incorporate a low current magnet design and a cryostat with a nitrogen reservoir, superinsualtion, and an additional radiation shield between the helium and nitrogen reservoirs to provide the ultimate efficiency in a top loading system.

Model 9TM-SVM-20 High Efficiency
Superconducting Magnet System

When required, Janis also offers 9 T/11 T up to 14 T/ 16 T magnets with a Lambda point refrigerator (LPR) for operation at the higher field, with the reservoir at atmospheric pressure. SuperVariMag systems offer efficient cost effective systems with static hold times that range from two to ten days, and are available with field homogeneities of 0.5% and 0.1% over a 1 cm diameter sphere. Larger sample tubes (3-4" OD), and higher field homogeneities (0.01 % or better over 1 cm diameter sphere) and special field profiles are available. Non-optical experiments such as critical current, resistivity, specific heat, Hall effect, etc. are easily performed with a SuperVariMag system. With the addition of appropriate gradient, modulation and pick-up coils, the SuperVariMag system is easily adapted for use in Faraday Balance susceptometry, vibrating sample magnetometry, etc.

The SuperVariMag series may be used in conjunction with an optional Independent magnet support and wiring system, thus allowing a magnet to be used with more than one insert (He3 or Dilution Refrigerator). In this configuration, the SVT Insert can be introduced and removed without disturbing the magnet.

Standard SuperVariMag Systems

System Model	Magnetic Field Strength	Field Homogeneity	Sample Tube Diameter	Dewar Type
*Th-SVM-d	6 - 9 Tesla	± 0.5 - ± 0.01%	1.0 - 2.5"	Vapor Shielded
*Th-SVM-d-B	6 - 9 Tesla	± 0.5 - ± 0.01%	1.0 - 2.5"	Vapor Shielded w/ Belly
*Th-SVM-d-HiEff	6 - 9 Tesla	± 0.5 - ± 0.01%	1.0 - 2.5"	Ultra Low Loss
*Th-SVM-d	10 - 14 Tesla	± 0.1%	1.0 - 2.5"	Vapor Shielded
*Th-SVM-d-B	10 - 14 Tesla	± 0.1%	1.0 - 2.5"	Vapor Shielded w/ Belly
*Th-SVM-d-HiEff	10 - 14 Tesla	± 0.1%	1.0 - 2.5"	Ultra Low Loss
* Specify a number for the intensity of the magnetic field h: Specify the homogeneity "h" d: Specify the diameter of the sample chamber "d" Systems available with Lambda Point Refrigerators upon request.

Sample Rotators

For applications that require rotation of the plane of the sample relative to a vertical magnetic field, Janis Research also offers two options. The first one offers continuous rotation of the plane of the sample, and the second one offers a precision rotation, typically up to 100 degrees. The precision rotator is also offered for inserts where the sample is located in vacuum. These sample rotators can be supplied for both non-optical as well as optical systems.

Sample rotators of Model 9TL-SVM-20 superconducting magnet system, cryogenics, Janis Research

Sample Probe with Precision Rotator
for He-4 & He-3 Cryostats

Special SuperVariMag Systems

The SuperVariTemp inserts can also be supplied for applications that require the sample to be in a high vacuum or ultra-high vacuum environment. Special compact inserts (with or without superconducting magnets) are also available to fit inside standard or special liquid helium storage dewars, but with limited sample space. Please contact us for more detailed information about the available systems.

Mechanical Drawing of SVM series superconducting magnet, SuperVariMag, He-4 system, Janis Research, cryogenics

SuperVariMag High Efficiency Series Superconducting Magnets, Janis Research, cryogenics

SVM-HI-EFF SERIES

SuperVariMag with Belly - SVM-B Series, superconducting magnets, Janis Research, cryogenics

SVM-B SERIES

Table of Contents	Page
Introduction	1
He-4 systems
SuperVariMag	2
OptiMag	3
SuperOptiMag	4
Room Temperature Bore systems	5
He-3 systems	6
Dilution Refrigerators	7
Special Systems
UHV Compatible Systems	8
Microscopy	9
Cryogen-free	10

JANIS RESEARCH COMPANY, INC.
2 Jewel Drive, P.O. Box 696
Wilmington, MA 01887-0696 USA
TEL: +1-978-657-8750 FAX: +1-978-658-0349
E-Mail: sales@janis.com
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