Work supported by the UsS. Atomic Energy Commission. I. OPERATIONS STATISTICS At the date of this conference, the SLAC two-mile accelerator has been in operation for approximately 4 years. A review of the operations record during the 16 quarters of the machine’s life ‘is given in Table 1, It may be noted that in this period the percent of the operating time devoted to accelerator physics has continued to decrease while the time used for particle physics has increased. The percent of the time consumed by scheduled and unscheduled downtime has generally decreased but has now reached the point where further decreases will occur only if the scheduled number of shifts per year increases substantially. A more detailed breakdown of accelerator operations during the past two fiscal years is given in Table 2. II. RECENT ACCELERATOR IMPROVEMENTS In operations to date, the two-mile accelerator has attained a maximum no-load energy of 22 0 1 GeV and has achieved a maximum average beam power of 750 kW at a beam pulse length of A0 6 psec and a pulse repetition rate of 360 pps. Recent efforts have involved improvements in multiple beam capability, in-creases in operational flexibility,. and improvements in beam current, stability, and energy spectrum. Some of the recent improvements are discussed in more detail below
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