Improved temperature regulation and corrosion protection of APS linac RF components

Abstract

/At the Advanced Photon Source (APS) at Argonne National Laboratory (ANL), a fke-electron laser (FEL) based on the self-amplified spontaneous emission (SASE) process is nearing completion. Recently, an rf photoinjector gun system was made available to the APS by Brookhaven National Laboratory/Accelerator Test Facility (BNL/ATF). It will be used to provide the highbrightness, Iow-emittance, and low-energy spread electron beam required by the SASE FEL theory. A Nd:Glass laser system, capable of producing a maximum of 500 p.J of W in a 1-10 ps pulse at up to a 1O-H2 repetition rate, serves as the photoinjector's drive laser. Here, the design, commissioning, and integration of thk gun with the APS will be discussed.

Water purity development for the coupled cavity linac (CCL) and drift tube linac (DTL) structures of the Spallation Neutron Source (SNS) linac

“…A 5-micron pre-filter sieves out the largest contaminants. Following the filter, the water will pass through an oxygen scavenger resin canister, similar to the system used in the APS Linac Water Cooling System [5]. The carbon canister removes hydrocarbon contaminants, including residual petroleum products remaining in the piping from manufacturing processes.…”

“…Approximately 1-5% of the main water flow will be diverted to the water purification loop, the quantity being monitored with a flow meter. The flow in this loop requires an oxygen content of less than 20 ppb to minimize corrosion [5] and bacterial growth. When copper is exposed, the corrosion is embodied as insoluble particles of CuO and Cu 2 O, which amass in the system after removal from the parent surface.…”

“…When copper is exposed, the corrosion is embodied as insoluble particles of CuO and Cu 2 O, which amass in the system after removal from the parent surface. Filtration is helpful in reducing this effect, however minimizing oxygen in the system proves more effective [5]. Table 1 summarizes the water quality to be obtained from the water purification system.…”