When the field effect {HEAD ~ transistor T} becomes conductive again, the first capacitor C1 is effectively in {TAIL ~ parallel} with the series circuit of the second diode D2 and the first coil L1 
When the field effect { HEAD ~ transistor T } becomes conductive again , the first capacitor C1 is effectively in { TAIL ~ parallel } with the series circuit of the second diode D2 and the first coil L1
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH