#Parameters
"""
B1 = 20     # starting mag. field in Amps
B2 = -20     # final mag. field in Amps
BSTEP = -0.5   # step size mag. field in Amps

FIELD_PRECISION = 0.05 #  in Amps
FIELD_CHANGE_SLEEP =  0.0 # put the Field   settling time if needed
"""
# List of scans. Each scan is defined as: (start,stop, step)
# to make a whole loop two scans are needed: [(B1, B2, BSTEP),(B2,B1,-BSTEP)]
# to make half of a loop one scan is needed: [(B1, B2, BSTEP),]  <- don't forget to put comma before ]
RANGES = [(B1, B2, BSTEP),(B2,B1,-BSTEP)] 


setpoints = []
for r in RANGES:
    setpoints = setpoints + frange(r[0], r[1], r[2], True)

# Main loop
for B in setpoints:
    print "Setting field = ", B
    caput("X11MA-XMCD:I-SETraw",B)
    time.sleep(FIELD_CHANGE_SLEEP )     # Settling time

    readback1 = caget("X11MA-XMCD:Ireadout")    

    while abs(readback1-B) > FIELD_PRECISION:
        readback1 = caget("X11MA-XMCD:Ireadout")
        time.sleep(0.5)

    run("Energy_MagScan.py")