(GT Solar story, updated for polysilicon market details)NEW YORK ( TheStreet) -- GT Solar ( SOLR) shares are rising on Wednesday after the solar equipment vendor signed its largest polysilicon equipment deal -- and largest single deal in company history -- with South Korean polysilicon giant OCI. OCI is paying $228 million for polysilicon reactors that will hit GT Solar's books in the first fiscal quarter of 2012. GT Solar shares were up between 7% on Wednesday to a new 52-week high of $12.32, and had reached their average daily trading volume at the mid-day mark. Shares had hit a previous 52-week high of $12.13 on Monday. "They are executing really well on grabbing new orders over the past few months and across all three business segments
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