Revision as of 08:22, 15 December 2011

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 ,R_Heater(4K)=135 ${\Omega }$ .
- I_Heater=55mA. The TVL-10 is used as current supply.

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.

@@ Line 16: / Line 16: @@
 ** Upper magnet - BOX VII, X9:1/4 ,R<sub>Heater</sub>(4K)=135{{O}}.
 ** I<sub>Heater</sub>=55mA. The TVL-10 is used as current supply.
 {{clear}}
 == Magnetisation and Demagnetisation Procedure ==
 * After ramping the magnet the magnetized first nuclear stage must be precooled. The temperature dependence varies as T~t<sup>-1/3</sup>.
 * 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.
 {{clear}}
 == Upper Magnet UMM ==
 *I/B-Conversion: 10A=1T
 {{clear}}
 == Lower Magnet LMM ==
 * I/B-Conversion: 0.8T=6.96A
 {{clear}}