MAGNET

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THE 9T MAGNET


... is working but this page is under construction :)

First test with 50Amps (~5.7T) worked!

In the picture a threaded rod is attracted by the magnet at 50A.

Using the Magnet  :)

  • Power Supply : OXFORD IPS 120-10 (Max.12 Amp @10Volt)
    • Software Remote-control: IPS_120-10_v03.vi
    • ! Change of Range when increasing the current at ~4.3A, when decreasing at ~3.4A! Don't get scared by the noise :)
  • Upper Magnet, Connection on window side of cryo. Power-cable are marked red (+) and blue (-).
  • Persistent current switch:
    • Upper magnet - BOX VII, X9:1/4 ,RHeater(4K)=135.
    • IHeater=55mA

Magnetisation and Demagnetisation Procedure

  • After ramping the magnet the magnetized first nuclear stage must be precooled. The temperature dependence varies as T~t-1/3.
  • The first nuclear stage was demagnetized by reducing the field in steps by a factor of 2 to a final field of few mT.
  • Sweep Rate B>0.5T : R=2T/h.
  • Sweep Rate B<0.5T : decrease by a factor of 2 proportional to the field.


Upper Magnet UMM

  • I/B-Conversion: 10A=1T

Lower Magnet LMM

  • I/B-Conversion: 0.8T=6.96A

Connection

  • To Power supply: M6 (13Rigschlüssle, 6erInbus).
  • To Upper Magnet: Connection on window side.
  • To lower magnet: Connection on door side of the cryostat.