Unfortunately the picture In my copy of " A short illustrated History of the RAE Bedford" by Arthur Pearcy is cropped so doesn't show the wing tips however it does say that WH793 participated in the HICAT programme in 1967 and was based at NASAs Ames research centre at Moffat Field.
A quick Goggle on clear air turbulence test bed has thrown up a whole load of flight sim and model pictures but only one actual image which is here and by the looks of it copy righted up to the ying yang so I've posted the link instead
Canberra PR Mk.7 WH793 Masirah 06101972 D12606
It also shows zaps for project COLDCAT RAF Tengah, StormForm and Operations Rover 1967.