ZLC Controller reported scheduled GPS Jamming in their sector resulted in loss of radar contact with aircraft resulting in one of them flying below the Minimum Vectoring Altitude.

Narrative

I was D-Side for sectors 30/31. BOV radar was out. There was GPS jamming causing multiple aircraft to be on vectors due to lost GPS capabilities. We had Aircraft X on a heading due to reported loss of GPS. He was south east of TWF and recently climbed to 120 for terrain. We lost radar on Aircraft X; we were unable to climb him due to overhead traffic at 130. We were unable to give instructions to join the V484 due to the MEA being 160. Aircraft X was last seen on a heading to avoid a 123 MIA (Minimum IFR Altitude) box; but we lost radar monitoring capabilities. Aircraft X was ADS-B equipped; but we weren't receiving several ADS-B targets due to the jamming. As soon as radar contact was lost I went to my OS (Operation Supervisor) and asked for stop buzzer due to the situation. Instead of calling for stop buzzer the OS came over to our position; stood behind us and tried to give us instructions on what to do; all of which we were unable due to reasons listed above. The OS finally went to call for stop buzzer; by which time we reacquired radar on Aircraft X.Recommendation: OS should have accepted controller request for stop buzzerGPS jamming mission sheet with anticipated affect should be placed at the position; this used to be done and was stopped for some reason.GPS jamming should have been cancelled after BOV radar outage.