MAGNET: Difference between revisions
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** I<sub>Heater</sub>=55mA. The TVL-10 is used as current supply. |
** I<sub>Heater</sub>=55mA. The TVL-10 is used as current supply. |
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* The region of the experimental platform between the first nuclear stage and the dilution refrigerator is compensated to 5mT when both magnets are at their full field. |
* The region of the experimental platform between the first nuclear stage and the dilution refrigerator is compensated to 5mT when both magnets are at their full field. |
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== Magnetisation and Demagnetisation Procedure == |
== Magnetisation and Demagnetisation Procedure == |
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* Sweep Rate B>0.5T : R=2T/h. |
* Sweep Rate B>0.5T : R=2T/h. |
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* Sweep Rate B<0.5T : decrease by a factor of 2 proportional to the field. |
* Sweep Rate B<0.5T : decrease by a factor of 2 proportional to the field. |
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* I/B-Conversion: 10A = 1T (? not yet clarified, date: 14.Dec 2011) |
* I/B-Conversion: 10A = 1T (? not yet clarified, date: 14.Dec 2011) |
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* Sweep Rate: 1 T/h = 10 A/h = 0.167 A/min |
* Sweep Rate: 1 T/h = 10 A/h = 0.167 A/min |
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* I/B-Conversion: B(I) = 0.115 T/A * I[A] , ( 78.4A = 9T ) |
* I/B-Conversion: B(I) = 0.115 T/A * I[A] , ( 78.4A = 9T ) |
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* Sweep Rate: 1 T/h = 8.7 A/h = 0.145 A/min |
* Sweep Rate: 1 T/h = 8.7 A/h = 0.145 A/min |
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= Connection = |
= Connection = |
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* To lower magnet: Connection on door side of the cryostat. |
* To lower magnet: Connection on door side of the cryostat. |
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* AMP-Plug (connected witch [[TT:BOXES#BOX_VII|BOX VII]]): Control of persistent current switch, read-out of two Pt-100, heater |
* AMP-Plug (connected witch [[TT:BOXES#BOX_VII|BOX VII]]): Control of persistent current switch, read-out of two Pt-100, heater |
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<gallery widths="120" heights="160" perrow="5"> |
<gallery widths="120" heights="160" perrow="5"> |
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Revision as of 12:20, 9 February 2012
Operate and Control
- 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. The TVL-10 is used as current supply.
- The region of the experimental platform between the first nuclear stage and the dilution refrigerator is compensated to 5mT when both magnets are at their full field.
Magnetisation and Demagnetisation Procedure
- After ramping the magnet the first nuclear stage must be precooled again. 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
- Bmax = 8T, diameter 100mm.
- I/B-Conversion: 10A = 1T (? not yet clarified, date: 14.Dec 2011)
- Sweep Rate: 1 T/h = 10 A/h = 0.167 A/min
Lower Magnet LMM
- Bmax = 9T, diameter 50mm.
- I/B-Conversion: B(I) = 0.115 T/A * I[A] , ( 78.4A = 9T )
- Sweep Rate: 1 T/h = 8.7 A/h = 0.145 A/min
Connection
- To Power supply: M6 (#13 box wrench, #6 Allen key).
- To Upper Magnet: Connection on window side.
- To lower magnet: Connection on door side of the cryostat.
- AMP-Plug (connected witch BOX VII): Control of persistent current switch, read-out of two Pt-100, heater
Connection to upper magnet.
Connection to lower magnet.
Black AMP-Plug.
Installing the magnet with three supporting rods.
Connection of the current wiring at the rear panel of the power supply.
