Commercial Fixed Wing
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 4.0
Communication Breakdown; Situational Awareness
ATC Issue All Types; Conflict Airborne Conflict
Air Traffic Control Issued Advisory / Alert; Flight Crew Took Evasive Action
Chart Or Publication; Airspace Structure; Company Policy; Procedure
I was working a Radar Departure sector and acknowledged Aircraft X in the departure rundown list. At the time; there wasn't a VFR conflict in the departure corridor. A little bit of time passed; and there were 2 VFR aircraft in the corridor so I called Tower to tell them not to launch Aircraft X. As I was calling; I saw the splat (Aircraft X's target) and knew it was too late. One target was at 1;900 feet; the other was at 2;800 feet. I could not stop Aircraft X at any safe altitude. I asked Tower if they see the traffic and they said something to the effect of they had it or that they would take care of it. As I watched the situation I called Tower again to tell them to keep Aircraft X climbing. They said they were not talking to him. Aircraft X and one of the targets were almost right on top of each other at the same altitude. Aircraft X was checking in as I was on the line with Tower telling them to keep him climbing. Aircraft X checked in out of 3;300 feet responding to an RA.[Suggest] make LGB airspace a Class C before there is a fatality.
SCT Departure Controller reported a departing aircraft was in immediate conflict and received a TCAS RA with VFR aircraft transitioning the airspace not in communication with ATC.