AN SMT TURNING TO INTERCEPT THE ILS FINAL TO RWY 23L AT CLE; OH; ENCOUNTERS WAKE TURB. THE ENCOUNTER ROLLS THE SMT INTO A 200 DEG BANK AND CAUSES A 300 FT LOSS OF ALT.

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FLT CONDITIONS WERE IMC AND A VERY SMOOTH RIDE. AS I WAS INTERCEPTING THE ILS INBOUND; A SLIGHT R-HAND BANK; I LOST COMPLETE CTL OF THE ACFT AND IT SNAPPED INTO APPROX 200 DEGS R-HAND BANK. IT FELT AS IF THE R WING BROKE OFF. AFTER RECOVERING IT WAS ALL I COULD DO TO STAY ON THE ILS AND I DID NOT RPT THIS TO ATC. ATC WAS VERY BUSY; AND A LOT OF TFC AT THE TIME. THEY WERE ASKING ME TO KEEP MY SPD UP AND I THINK THEY TURNED ME ON TOO CLOSE BEHIND A HVY JET. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR PARTICIPATED IN THE STRUCTURED WAKE TURB CALLBACK STUDY. RPTR WAS GREATLY SHOCKED WHEN HE ENCOUNTERED THIS WAKE. HE WAS COMPLACENT AS THE FLT CONDITIONS WERE VERY SMOOTH. HE WAS IMC AND HAD ZERO FORWARD VISIBILITY. THERE WAS NO ANNOUNCEMENT FROM TRACON OF WHAT TYPE OF ACFT WAS IN FRONT OF HIM OR DISTANCE FROM LEADING ACFT. WHEN THE TURB STRUCK; THE ACFT FELT AS IF THE R WING FELL OFF. THE BANK WAS SHARP AND EXTREME; THE ACFT ROLLED INTO A 200 DEG BANK AND THE ACFT DSNDED 300- 400 FT. RPTR STATED IT SCARED HIM AND HIS PAX TO A GREAT DEGREE.