Operating results of the Electron Ring of Saskatchewan (EROS)

The pulse stretcher ring EROS is designed to convert the pulsed electron beam of the linear accelerator of the Saskatchewan Accelerator Laboratory to a CW beam, increasing the duty factor from 0.036% to near 100%. The ring has been operating since December 1986, when a low-intensity beam was stored for a few seconds. By the following spring, beam storage times up to 20 min were achieved and some machine parameters were measured. The measurement of the betatron tunes, ν _x and ν_y, and the machine beta functions, β_x and β_y, showed that the ring lattice was operating as designed. Resonant extraction was first confirmed in the fall of 1987, with an extraction efficiency of 95%. The extracted emittances were about 1.0 (π) mm-mrad in both planes and the energy spread less than the injected energy spread of 0.1%. The nuclear experimental program began in the summer of 1988 with up to 4 μA of CW beam routinely extracted from 150 to 200 MeV. In February 1989 the ring RF was used to increase the duty factor from 12% to 52% at 250 MeV. Future commissioning plans include the introduction of multiturn injection to increase the current and the adjustment of the chromaticities, and to reduce the extracted emittances and energy spread