1. Electronics Science and Technology Division, U.S. Naval Research Laboratory, Washington, DC, USA
2. Materials Science and Technology Division, U.S. Naval Research Laboratory, Washington, DC, USA
3. Laboratory for Neutron and Muon Instrumentation, Paul Scherrer Institut, PSI, Villigen 5232, Switzerland
4. Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN, USA