Difference between revisions of "Magnet Energization Procedure"

From Hall A Wiki
Jump to: navigation, search
Line 20: Line 20:
 
#*Wait until timer counts down to zero (maybe I little more)
 
#*Wait until timer counts down to zero (maybe I little more)
 
#The magnet must be ramped up in steps with the correct current rates, PDP should not allow you to exceed these rates, but be mindful.  For 2.5T Set the Setpoint to 60.9135A and Setrate to 3.0A/min. There is only one step in this case.  For 5.0T there are four steps (seen below).  At each step enter the Setpoint and corresponding Setrate then press To SETPOINT
 
#The magnet must be ramped up in steps with the correct current rates, PDP should not allow you to exceed these rates, but be mindful.  For 2.5T Set the Setpoint to 60.9135A and Setrate to 3.0A/min. There is only one step in this case.  For 5.0T there are four steps (seen below).  At each step enter the Setpoint and corresponding Setrate then press To SETPOINT
−
when the current has been reached press HOLD and change value to the Setpoint and Setrate for the next step and press SETPOINT
+
when the current has been reached press HOLD and change value to the Setpoint and Setrate for the next step and press SETPOINT.
−
After each change of Setppoint and Setrate check the Magnet Control display in PDP to make sure Labview is reading in correctly
+
After each change of Setpoint and Setrate check the Magnet Control display in PDP to make sure Labview is reading in correctly
 
#*A.) Setpoint:  80A  Setrate: 3.0A/min
 
#*A.) Setpoint:  80A  Setrate: 3.0A/min
 
#*B.) Setpoint: 100A  Setrate: 2.0A/min
 
#*B.) Setpoint: 100A  Setrate: 2.0A/min
Line 37: Line 37:
  
 
#Hit "Unlock Magnet Controls" button in the Polarization Display Panel, '''PDP'''
 
#Hit "Unlock Magnet Controls" button in the Polarization Display Panel, '''PDP'''
−
#*'''Verify''' the Shim Heater is On (indicator in PDP and camera on PS).  This must always be On!
 
−
#*'''Verify''' the Switch heater is OFF
 
−
#Put PDP in "Monitor," if necessary, to allow update of switch and shim status
 
 
#If necessary, Ramp the Power Supply to the Magnet Current
 
#If necessary, Ramp the Power Supply to the Magnet Current
 
#*Type the value of the magnet current (this is in Amps) into the "Setpoint" box
 
#*Type the value of the magnet current (this is in Amps) into the "Setpoint" box
Line 45: Line 42:
 
#*Wait for the PS current to reach the Magnet current
 
#*Wait for the PS current to reach the Magnet current
 
#Hit "Heater On" button and confirm this action in the dialog box that presents itself  
 
#Hit "Heater On" button and confirm this action in the dialog box that presents itself  
−
#*'''Ensure''' the Heater On status with cameras on the PS and the indicator in PDP
+
#*Wait until timer counts down to zero (maybe a little more)
−
#*Wait until timer counts down to zero
+
#Set the first Setpoint and Setrate values.  PDP should not allow you to exceed these rates, but be mindful. With 2.5T you can just press TO ZERO.  With 5.0T the magnet must be ramped down in steps.  At each step enter the Setpoint and corresponding Setrate then press To SETPOINT when the current has been reached press HOLD and change value to the Setpoint and Setrate for the next step and press SETPOINT. After each change of Setpoint and Setrate check the Magnet Control display in PDP to make sure Labview is reading in correctly
−
#*If the countdown starts before the indications, wait at least 30 seconds from the time the heater is on, ignoring the count-down
+
#*A.) Setpoint: 115A  Setrate: 0.5A/min
−
#Set the first Setpoint and Setrate values.  PDP should not allow you to exceed these rates, but be mindful.
+
#*B.) Setpoint: 100A  Setrate: 1.0A/min
−
#*Type the value 0.30 (this is in Amps/min) into the "Setrate" box
+
#*C.) Setpoint: 80A  Setrate: 2.0A/min
−
#*Type the value 72.0 (this is in Amps) into the "Setpoint" box
+
#*D.) Setpoint: 0A Setrate: 3.0A/min
−
#Hit the "To Setpoint" button
+
−
#:'''Monitor the Voltage in the Coil and Leads (camera, PDP)!  A high voltage is a sign of a coming quench.'''
+
−
#:'''If it is increasing rapidly or exceeds 7 V, press "Hold"!'''
+
−
#Wait for magnet to reach 72.0 A (20 min)
+
 
#Press "Hold"
 
#Press "Hold"
−
#Set the Setpoint and Setrate values for the next current step:
 
−
#*Type the value 0.60 into the "Setrate" box
 
−
#*Type the value 60.0 into the "Setpoint" box
 
−
#Press "To Setpoint"
 
−
#Wait for magnet to reach 60.0 A (20 min)
 
−
#Press "Hold"
 
−
#Set the Setpoint and Setrate values for the last current step:
 
−
#*Type the value 1.20 into the "Setrate" box
 
−
#*Type the value 0.0 into the "Setpoint" box
 
−
#Wait until magnet current reaches zero (45 min)
 
 
#Hit the "Hold" button
 
#Hit the "Hold" button
 
#Hit the "Heater Off" button
 
#Hit the "Heater Off" button
−
#*'''Ensure''' the Heater Off status with cameras on the PS and the indicator in PDP
 
−
#*Wait until timer counts down to zero
 
−
#*If the countdown starts before the indications, be sure to wait at least 30 seconds from the time the heater is off, ignoring the count-down
 
 
#Hit "Lock Magnet Controls" button
 
#Hit "Lock Magnet Controls" button

Revision as of 02:12, 7 March 2012

Ramping the magnet is to be done only by target experts

Ramp Up Procedure

Restrictions:

  • DO NOT exceed rate limits listed below − magnet can quench
  • DO NOT allow persons with medical implants near magnet − death can occur
  • AVOID the need for a fill during ramping - warm gas can cause quench
  • Ensure safety prerequisites for magnet ramping are met.

Procedure: Instructions from Counting House which assumes: The magnet power supply is on and a sweep for magnetic objects from an area within 4m of the magnet has already been done

  1. Put PDP in "Monitor," if necessary, to allow updates from users
  2. Push "Unlock Magnet Controls" button in the Polarization Display Panel, PDP
    • Verify that there is no current in the leads (Power supply icon, far left)
  3. Push "Hold" button
  4. Hit "Heater On" button and confirm this action in the dialog box that presents itself
    • Wait until timer counts down to zero (maybe I little more)
  5. The magnet must be ramped up in steps with the correct current rates, PDP should not allow you to exceed these rates, but be mindful. For 2.5T Set the Setpoint to 60.9135A and Setrate to 3.0A/min. There is only one step in this case. For 5.0T there are four steps (seen below). At each step enter the Setpoint and corresponding Setrate then press To SETPOINT

when the current has been reached press HOLD and change value to the Setpoint and Setrate for the next step and press SETPOINT. After each change of Setpoint and Setrate check the Magnet Control display in PDP to make sure Labview is reading in correctly

    • A.) Setpoint: 80A Setrate: 3.0A/min
    • B.) Setpoint: 100A Setrate: 2.0A/min
    • C.) Setpoint: 115A Setrate: 1.0A/min
    • D.) Setpoint: 121.6A Setrate: 0.5A/min
  2. Press "Hold"
    • If persistent mode is not desired, stop here
  3. Wait for 30 seconds
  4. Press the "Heater Off" button
    • Wait until timer counts down to zero (maybe I little more)
  5. To ramp down leads, press "To Zero" button
  6. Hit "Lock Magnet Controls" button

Ramp Down Procedure

  1. Hit "Unlock Magnet Controls" button in the Polarization Display Panel, PDP
  2. If necessary, Ramp the Power Supply to the Magnet Current
    • Type the value of the magnet current (this is in Amps) into the "Setpoint" box
    • Press "To Setpoint"
    • Wait for the PS current to reach the Magnet current
  3. Hit "Heater On" button and confirm this action in the dialog box that presents itself
    • Wait until timer counts down to zero (maybe a little more)
  4. Set the first Setpoint and Setrate values. PDP should not allow you to exceed these rates, but be mindful. With 2.5T you can just press TO ZERO. With 5.0T the magnet must be ramped down in steps. At each step enter the Setpoint and corresponding Setrate then press To SETPOINT when the current has been reached press HOLD and change value to the Setpoint and Setrate for the next step and press SETPOINT. After each change of Setpoint and Setrate check the Magnet Control display in PDP to make sure Labview is reading in correctly
    • A.) Setpoint: 115A Setrate: 0.5A/min
    • B.) Setpoint: 100A Setrate: 1.0A/min
    • C.) Setpoint: 80A Setrate: 2.0A/min
    • D.) Setpoint: 0A Setrate: 3.0A/min
  5. Press "Hold"
  6. Hit the "Hold" button
  7. Hit the "Heater Off" button
  8. Hit "Lock Magnet Controls" button
Retrieved from "https://hallaweb.jlab.org/wiki/index.php?title=Magnet_Energization_Procedure&oldid=14824"