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We consider twisted tachyons on C/Z_N orbifolds of bosonic closed stringtheory. It has been conjectured that these tachyonic instabilities correspondto decays of the orbifolds into flat space or into orbifolds with smallerdeficit angles. We examine this conjecture using closed string field theory,with the string field truncated to low-level tachyons. We compute the tachyonpotentials for C/Z_2 and C/Z_3 orbifolds and find critical points at depthsthat generate about 70% of the expected change in the deficit angle. We findthat both twisted fields and untwisted modes localized near the apex of thecone acquire vacuum expectation values and contribute to the potential.Comment: 36 pages, 5 figures, LaTeX2e; v2: one reference added and minor  cosmetic change

Twisted Tachyon Condensation in Closed String Field Theory