1. MDL0L02 Dipole Hysteresis Loop Study
September 20, 2016

2. CEBAF DL Magnet at Injector

3. Field Map (27 G-cm Offset Subtracted)

4. Field Map Residuals (Bdl-p1*I)

5. Hysteresis Loop

6. Modified Hysteresis Loop
Two Modifications:
Subtract 8 G-cm from I=0 Bdl
Subtract A from Magnet Current

7. Final New Field Map Modifications:
Current (A) Strength (Gauss-cm)
0 91
Modifications:
Subtract environmental field offset of 27 G-cm
Subtract 8 G-cm from I=0 Bdl
Subtract A offset from Magnet Current

8. Spare DL Magnet at MMF

9. Field Map (49 G-cm Offset Subtracted)

10. Field Map Residuals (Bdl-p1*I)

11. Hysteresis Loop

12. Modified Hysteresis Loop
One Modifications:
Add A offset to Magnet Current

13. Summary Hysteresis loop study of CEBAF DL magnet showed:
Bdl abnormality at I=0. Fixed by subtracting 8 G-cm.
Magnet current during mapping was off by A. Fixed by subtracting this offset from map current .
Similar check for the spare DL, showed a current offset
Request to install new Field Map for CEBAF DL magnet