Thyristor turn on process

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http://forum.allaboutcircuits.com – Hi guys, i came across the turning on process of thyristor scr and i am pretty confuse about what my lecturer says, he says that when a gate current is applied the depletion region of the j2 will be increased and this causes regenerative effect and large anode current to flow But i was confused, doesnt the increased depletion region impede current flow from anode to cathode? (Embedded)