MDL0L02 Dipole Hysteresis Loop Study

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Presentation transcript:

MDL0L02 Dipole Hysteresis Loop Study September 20, 2016

CEBAF DL Magnet at Injector

Field Map (27 G-cm Offset Subtracted)

Field Map Residuals (Bdl-p1*I)

Hysteresis Loop

Modified Hysteresis Loop Two Modifications: Subtract 8 G-cm from I=0 Bdl Subtract 0.003 A from Magnet Current

Final New Field Map Modifications: Current (A) Strength (Gauss-cm) -------------- ------------------- -9.995 -23971.2 -8.999 -21596.6 -7.994 -19196 -6.993 -16796.5 -5.993 -14387.7 -4.996 -11981.6 -3.997 -9569.8 -2.992 -7143.1 -1.992 -4725.2 -0.993 -2310.6 0 91 1.006 2521.4 2.006 4933.8 3.006 7347.6 4.007 9758.8 5.007 12165 6.007 14562.8 7.008 16953.4 8.01 19333.4 9.012 21693.5 10.011 24011.1 Modifications: Subtract environmental field offset of 27 G-cm Subtract 8 G-cm from I=0 Bdl Subtract 0.003 A offset from Magnet Current

Spare DL Magnet at MMF

Field Map (49 G-cm Offset Subtracted)

Field Map Residuals (Bdl-p1*I)

Hysteresis Loop

Modified Hysteresis Loop One Modifications: Add 0.015 A offset to Magnet Current

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 0.003 A. Fixed by subtracting this offset from map current . Similar check for the spare DL, showed a 0.015 current offset Request to install new Field Map for CEBAF DL magnet