A energy analyzer system is being built for the DARHT-II accelerator similar to the energy analyzer used on the Astron accelerator. This system consists of a scattering wire, magnetic bend, and null signal detector. The wire thickness of 40 mil carbon and the scattering angle of 11 degrees is chosen for good signal to noise ratio. The dipole bend angle is 60 degrees, with a 30 cm radius of curvature. The image-plane focal distance is chosen for the required energy resolution. The energy resolution and acceptance are 0.1% and /spl plusmn/5% with a time response of 10 nsec. The wire must survive the 2 usec 2 kA, 18.4 MeV DARHT-II beam. The MCNP code was used to study the wire scattered properties. The scattered beam fills the available 1/spl times/2 cm dipole aperture. The dispersion normal to the beam direction is 0.43 cm/%. The detector is a PIN diode array which determines the beam position on the chip. This array consists of 40 2.5/spl times/0.1/spl times/0.25 mm bins with a gain in excess of 10000. The system will be installed in the space between the debris blocker and the cruncher solenoid up-stream from the shuttle dump.

Designs for LIAs (linear induction accelerators) stem primarily from physics concerns about stable beam transport and emittance preservation; these concerns lead to specific design features of the induction cores and injectors, stringent requirements on energy regulation, and specification of voltage gradient and precision magnetic alignment. Further challenges unique to HAP (high average power) operation (e.g. transient suppression, thermal management) heighten requirements on switching, reset regulation, jitter, power regulation/compensation, diagnostic sensing, and active control. The authors review how the HAP test stands and the total system integration on the ETA-II (Experimental Test Accelerator II) are developing the technologies needed to satisfy these requirements