NMAC BTWN 2 C172'S ON THE DOWNWIND LEG AT THE CMA CTLED ARPT.

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DEC/XA/99 AT APPROX XA30; I WAS THE INSTRUCTOR PLT IN SKYHAWK FLYING WITH THE HOLDER OF A PVT PLT CERTIFICATE WHO WAS UNDERGOING INSTRUCTION FOR AN INST RATING. WE WERE CONCLUDING THE LESSON HAVING JUST SHOT A VOR APCH; UNDER VFR CONDITIONS; TO THE CAMARILLO ARPT. AT CEECE INTXN; WE WERE INSTRUCTED TO CONTACT CMA TWR ON 128.2. THIS WAS ACCOMPLISHED. CMA TWR ADVISED US TO ENTER A R DOWNWIND FOR RWY 8. THE STUDENT WAS SATISFACTORILY HOLDING THE FINAL APCH COURSE AND DSNDING AT APPROX 500 FPM. THIS WAS COMPLICATED BY A STRONG WIND OUT OF THE NE AT 30+ KTS OR BETTER. I PULLED THE STUDENT OUT FROM UNDER THE VIEW LIMITING DEVICE AT 1100 FT AND INSTRUCTED HIM TO ENTER R TFC FOR RWY 8. HE LEVELED OFF AT 1000 FT; ENTERED A R DOWNWIND; AND STARTED TO SLOW DOWN PRIOR TO EXTENDING HIS FLAPS. ON THE DOWNWIND; SLIGHTLY E OF THE TWR AND OVER THE FREEWAY; WE WERE ADVISED OF TFC ON FINAL. WE WERE LOOKING FOR THIS TFC WHEN ALL OF A SUDDEN A HIGH WING C172 WAS OBSERVED CLBING TO OUR ALT AND TURNING L. THE R WING WAS UP AND THE ACFT WAS POSITIONED AT APPROX 45 DEGS; HDG TOWARDS THE DOWNWIND. AT THIS ANGLE AND WING UP POS; IT WOULD HAVE BEEN IMPOSSIBLE FOR THE PLT TO SEE US. WE TOOK EVASIVE ACTION AND THE ACFT PASSED WITHIN 500 FT OF OUR POS. CMA TWR NEVER ADVISED US OF THE TFC. THE PLT OF THE OTHER ACFT WAS IN A TURN AND DID NOT SEE US. I CALLED TWR AND TOLD THEM OF THE TFC. A VOICE (NOT IDENTED) CAME ON THE AIR AND SAID TO THE EFFECT THAT HE DIDN'T SEE US. WE COMPLETED OUR TFC PATTERN AND FULL STOP LNDG WITHOUT FURTHER INCIDENT. I CALLED CMA TWR AT APPROX XB30 AND SPOKE WITH THE CTLR ON DUTY WHEN THIS INCIDENT OCCURRED. HE SAID THAT HE CLRLY REMEMBERED THE INCIDENT AND THAT HE HAD CALLED THE OTHER ACFT BUT HAD TO DO SOMETHING ELSE AT THE TIME SO HE DIDN'T CALL US. IN MY OPINION THIS IS NOT A SATISFACTORY ANSWER. THE OTHER ACFT HAD NO OPPORTUNITY TO SEE US DUE TO HIS POS IN THE TURN. MY BELIEF IS THAT THE CTLR WAS GROSSLY NEGLIGENT IN NOT NOTIFYING US OF THE POTENTIAL NEAR MISS. AS PER THE TWR'S PREVIOUS INSTRUCTIONS WE WERE LOOKING ON THE FINAL APCH COURSE FOR THE TFC THAT HAD BEEN CALLED. WE HAD NO REASON TO SCAN THE RWY FOR TFC TAKING OFF AND TURNING L. THE TFC TAKING OFF WAS IN A TURN AND CLBING INTO A WIND IN EXCESS OF 35 KTS. THIS GREATLY SLOWED THE ACFT DOWN AND ALLOWED IT TO CLB UP FASTER OVER THE GND. I TOLD THE TWR CTLR THAT I WANTED HIM TO FILE A NMAC RPT. HE STATED THIS WOULD BE DONE. THIS IS THE SECOND NMAC I HAVE BEEN INVOLVED WITH AT THE CMA ARPT WITHIN THE PAST 60 DAYS. I STRONGLY SUGGEST THAT COMPETENT SUPERVISION AND CTLRS BE ASSIGNED TO THIS TWR. THIS IS A BUSY GA TWR. THE CHANCES FOR A TRAGEDY OCCURRING ARE GREAT; AND IN MY OPINION INCREASING DAILY.