driver becoming 2.5m, 6.4m, 10m (acceleration and deceleration sections) devices as sections were added. Work began in 1978 to design and construct (SSI paid for materials) the drive coils, SCR feeders, and I beam mounts for the entire 10m version, see Chapter 2. During that summer large quantities of IR 151RA100 SCR's, capacitors, high power diodes, and other material became available from the PPA accelerator located at the Princeton Plasma Physics Laboratory. These parts were then used to construct Mass Driver Two (10m version). Optical trigger and SCR trigger circuits were breadboarded at this time and used to fire a group of four drive coils from sector four up to 750 volts by the end of the summer (1978), see Chapter 2 and Appendix I. The fall of 1978 was spent designing the printed circuit boards for the optical and SCR trigger circuits as well as designing the electronics housings to hold these circuits and the optical sensors. Early in 1979 these electronics housings were constructed and assembled for the 2.5m section. The printed circuit boards were assembled and installed in the electronics housings in late spring. Overall assembly of the accelerator proceeded in June and is shown in Fig. 1.1
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