In a closed-door vote Thursday, Cook County’s circuit judges will decide whether Chief Judge Timothy C. Evans will retain his position or if a different bench colleague will take on the role.Circuit Judge Lorna E. Propes has mounted a campaign for the top spot, hoping to unseat Evans after six terms. Evans has held the position since September 12, 2001, the longest tenure of any Cook County chief judge since the court system was unified in 1964.Both candidates declined to be interviewed for this report.The process …