  The Front End of the Spallation Neutron Source (SNS) extends from the Ion
Source (IS), through a 65 keV LEBT, a 402.5 MHz RFQ, a 2.5 MeV MEBT, ending at
the entrance to the DTL. The diagnostics suite in this space includes stripline
beam position and phase monitors (BPM), toroid beam current monitors (BCM), and
an emittance scanner. Provision is included for beam profile measurement,
either gas fluorescence, laser-based photodissociation, or a crawling wire.
Mechanical and electrical design and prototyping of BPM and BCM subsystems are
proceeding. Significant effort has been devoted to packaging the diagnostic
devices in minimal space. Close ties are maintained to the rest of the SNS
effort, to ensure long term compatibility of interfaces and in fact share some
design work and construction. The data acquisition, digital processing, and
control system interface needs for the BPM, BCM, and LEBT diagnostic are
similar, and we are committed to using an architecture common with the rest of
the SNS collaboration.
