Trouble Shooting of Deuteron RFQ for PKUNIFTY

A 201.5 MHz deuteron four-rod RFQ was designed and operated to generate high flux neutron for the application of neutron radiography at Peking University, which is called as Peking University Neutron Imaging Facility (PKUNIFTY). This paper presents two kinds of tuners to tune the cavity to the designed frequency and reach the needed field unflatness distribution less than 5%; the RFQ intervane voltage 70.7 kV determination by the roentgen spectrum measurement at 237.6 kW; output accelerated deuteron beam energy at 2.0 MeV with energy spread of 2.5% at 300 kW including additional about 60 kW beam power. Although it has been running more than one year, sometimes we have troubles not only for the RFQ, mainly for the RF system. This paper showed some troubles and its shootings methods. Some troubles and shooting methods might be useful for similar projects.