A third RF system was commissioned and the existing two systems were modified. Included in the revisions were a new 100 kW, 50 MHz power amplifier, an infra-red heat sensor monitoring the accelerating cavity temperature to compensate for water film coefficient thermal loss, and the isolation of vacuum-RF seals on the accelerating cavity. The results of these changes will be detailed.

No abstract

Presently (Dec. 1992) three RF systems power the electron beam at the NSLS X-Ray storage ring to 250 mA at 2.58 GeV. A fourth RF cavity and system is being installed to increase the machine reliability over pre-shutdown operational conditions (3 cavities). It also permits new levels of beam intensity and energy to be achieved in the X-Ray ring. Intensities of 500 mA at 2.5 GeV as well as 250 mA at 2.8 GeV are anticipated. A description of the hardware, the installation and the modes of operation will be outlined in this paper. X-Ray ring operations are scheduled to resume January 1993. Injection performance and high energy reliability will also be discussed.

It is'required that the NSLS X-ray accelerator reach an energy of 2.5 GeV. An additional accelerating cavity and power amplifier system were installed to meet this goal. A new control system was designed to include phase and amplitude servos as well as computer interfacing. Commissioning and operating experience will be reported.

No abstract