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71 For a given value of I the field is independent of the geometrical composition of the coil inside the winding space. The actual number of turns and the cross­ section of the conductors is entirely determined by the impedance of the power supply to which the magnet should be adapted. In the case of low impedance (high current and low voltage) few turns of thick metal should be used. In the case of high impedance (low current and high voltage) many turns of thin material are needed. High impedance coils are made of square wire or flat strip wound into layers or "pancakes" 1. A nice system for low impedance coils was deve­ loped by BITTER. The turns of his magnets consist of flat copper discs separated by thin insulating sheets and joined together at their edges. In this type of coil the current density is higher near the axis than at the exterior, resulting into a higher value for G (see above). For the details of the construction we refer to the original papers 2, 3. If the power is dissipated at a low voltage the cooling may be achieved with the help of water. Distilled water should be preferred over mains' water in order to prevent the magnet from corrosion. In the case of a high voltage coil some non-inflammable organic fluid should be used. A low viscosity and a large specific heat are advantageous.

Table of contents (5 chapters)

Table of contents (5 chapters)

Buy this book

eBook 71,68 €
price for Spain (gross)
  • ISBN 978-3-642-45838-5
  • Digitally watermarked, DRM-free
  • Included format:
  • ebooks can be used on all reading devices
  • Immediate eBook download after purchase
Softcover 90,47 €
price for Spain (gross)
  • ISBN 978-3-642-45840-8
  • Free shipping for individuals worldwide
  • Institutional customers should get in touch with their account manager
  • Covid-19 shipping restrictions
  • Usually ready to be dispatched within 3 to 5 business days, if in stock
  • The final prices may differ from the prices shown due to specifics of VAT rules
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Bibliographic Information

Bibliographic Information
Book Title
Low Temperature Physics II / Kältephysik II
Authors
Series Title
Mechanisches und thermisches Verhalten der Materie / Mechanical and Thermal Behaviour of Matter
Series Volume
3 / 15
Copyright
1956
Publisher
Springer-Verlag Berlin Heidelberg
Copyright Holder
Springer-Verlag OHG. Berlin · Göttingen · Heidelberg
eBook ISBN
978-3-642-45838-5
DOI
10.1007/978-3-642-45838-5
Softcover ISBN
978-3-642-45840-8
Edition Number
1
Number of Pages
VIII, 478
Topics