     
     func isAlphaWellEvent(_ eventId: Int) -> Bool {
         return AlphaWell.contains(eventId)
+    }
+    
+    func isAlphaWellBackEvent(_ eventId: Int) -> Bool {
+        return AlphaWellBack.contains(eventId)
     }
     
     func isGammaEvent(_ eventId: Int) -> Bool {

            return cached
        }
        
        let value = eventId <= alphaWellMaxEventId || isTOFEvent(eventId) || isGammaEvent(eventId) || isNeutronsEvent(eventId) || isVETOEvent(eventId)
        isValidEventIdForTimeCheckCache[eventId] = value
        return value
    }

            return "Veto"
        } else if isGammaEvent(eventId) {
            return "Gam"
        } else if isAlphaWellBackEvent(eventId) {
            return "WBk"
        } else {
            return "Wel"
        }
