ACR X UNABLE TO COMPLETE VISUAL APCH MULTIPLE RWY OP PARALLEL RWYS ISSUED APCH RWY 23.

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I (ACR X) WAS ON A R DOWNWIND FOR RWY 18R AT CHARLOTTE- DOUGLAS ARPT TALKING TO APCH CTL ON 119.0. AT APPROX 5 MI N OF RWY 18R AND AT AN ALT OF 6000 FT MSL; THE APCH CTLR BEGAN GIVING US A R TURN TO 090 DEGS. I EXPLAINED TO THE CTLR AT THAT TIME THAT WE WOULD NOT BE ABLE TO ACCOMPLISH A VISUAL APCH TO RWY 18R FROM THAT POS AND HE CONTINUED TO GIVE US TURNS TO 180 DEGS AND HAVE US CONTINUE DSNDING. AS WE CONTINUED ITS R TURN TO 180 AND DSNDED PER ATC'S REQUEST; I REITERATED OUR INABILITY TO BE ABLE TO FLY A SAFE VISUAL PATTERN TO RWY 18R. OUR POS AT THIS TIME WAS E OF THE CTRLINE FOR RWY 18L AT CHARLOTTE. THE APCH CTLR THEN REALIZING THE IMPASSE THEN ASKED IF WE HAD RWY 23 AT CHARLOTTE. WE ACKNOWLEDGED WE HAD RWY 23 IN SIGHT AND HE IMMEDIATELY CLRED US FOR THE VISUAL TO 23 AND SWITCHED US TO TWR ON 118.1. AFTER SWITCHING TO CHARLOTTE TWR ON 118.1 AND COMMENCING WITH THE VISUAL TO RWY 23; I LOOKED UP AND SAW ANOTHER ACFT FAST APCHING OUR ACFT AT THE 7 O'CLOCK POS APPARENTLY ON THE VISUAL TO RWY 23 ALSO. OUR TCASII IS GOING OFF LIKE CRAZY AND I TOLD THE PF I SAW THE TFC AND HE WAS TAKING NECESSARY MEASURES TO AVOID OUR ACFT. WE THEN LANDED ON RWY 23 AT CHARLOTTE WITHOUT FURTHER INCIDENT. MOST OF WHAT I HAVE JUST HAD DESCRIBED TO YOU IN THIS RPT HAPPENED WITHIN 6-7 MI OF THE CHARLOTTE ARPT AT AN ALT BELOW 6000 FT MSL. A SIMPLE SOLUTION TO THIS TYPE OF SITUATION WOULD BE TO HAVE THE ATC CTLRS EXTEND ACFT FAR ENOUGH OUT ON A DOWNWIND AS TO ALLOW THE ACFT SAFE AND REASONABLE TIME AS TO CONDUCT THE APCH.