Operational Availability of the SNS During Beam Commissioning

The Spallation Neutron Source accelerator systems will deliver a 1 GeV, 1.44 MW proton beam to a mercury target for neutron production. The beam commissioning of the accelerator systems is taking place in modules, as components are installed and tested. To date there have been four beam commissioning runs, the H-injector, Drift Tube Linac Tank 1, Drift Tube Linac Tanks 1-3 and Drift Tube Linac Tanks 4-6 plus CCL modules 1-3. Among the critical performance goals have been achieved are, demonstration of design 38 mA beam peak current, 1 msec long beam pulse, and 1 mA average beam. Results of accelerator availability during beam commissioning program are presented.