A ceramic body (14) for a discharge vessel (12) includes a central barrel
portion (60) and two end plus (64, 66), which close opposite ends of the
barrel. Main electrode (32, 34) and an initiator electrode 50 are supplied
with power via conductors in leg members (70, 76, 72). In one embodiment,
a first electrode 32 and the initiator electrode are supplied with current
through two separate leg members. In another embodiment, a dual electrode
leg member is provided with two bores (124, 126).
