stm:manual_setting_of_the_magnetic_field
Table of Contents
Manual Setting of the Magnetic Field
Driven Mode
Advantage: faster field sweeps. Disadvantage: helium consupmtion and noise increased.
- Superconducting switch HEATER ON. Wait 1 minute.
- Select right MID set point with SELECT on keypad.
- Press MID toggle button.
- To change set point to a smaller or bigger value, just change MID set point and re-press MID if not already toggled on.
- Note that you can PAUSE the ramp at any moment with PAUSE.
Persistent Mode
Advantage: less noise and helium consumption, field more stable. Disadvantage: slower to change field.
- Superconducting switch HEATER ON. Wait 1 minute.
- Energize to desired current/field setpoint (by pre selecting the desired MID setpoint and pressing MID).
- Wait about 1 minute for current to stabilize.
- Turn OFF superconducting switch HEATER.
- Wait 1 minute for switch to become superconducting.
- Set current to ZERO, slowly first and at lower current the rate can be increased.
- Now you can possibly switch the magnet power supply off.
To set the field back to ZERO or to a different value:
- Switch HEATER still OFF.
- Ramp up the current to previous value and wait till value is reached.
- Switch's HEATER ON. Wait 1 minute.
- Change set point by changing MID. Press MID (or ZER0).
- Wait about 1 minute for current to stabilize.
- Turn OFF superconducting switch HEATER.
- Wait 1 minute for switch to become superconducting.
- Repeat, as written above, the procedure to ramp the current to ZERO and switch off the power supply.
stm/manual_setting_of_the_magnetic_field.txt · Last modified: 2007/01/29 18:01 by galli