Abstract
The preaccelerator chains are operational, delivering 13-GeV electron (positron) and 40-GeV proton beams to the HERA (Hadron Electron Ring Accelerator) rings. The electron ring has achieved 27.5 GeV at 5% of the design intensity and with a beam lifetime of several hours. The first octant of the proton ring was cooled down, the quench protection was successfully tested, and the optics was checked using a 7-GeV positron beam. The HERA proton ring was completed in early November 1990, and it has been at cryogenic temperatures since mid December. The steady-state condition at 4.4 K could easily be established, and the measured cryogenic heat load of the ring is below the predicted value. >
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