Thermal/structural design and fabrication development of high power CCDTL and CCL structures

Thermal management, resonance control, and reliability requirements become predominant when designing ``conventional`` copper coupled- cavity linac (CCL) structures for very high duty factors and accelerating fields. Whereas the outer body of the coupled-cavity drift-tube linac (CCDTL) is in most ways comparable to the CCL, the cooling and support of the added drift tubes present totally new and interesting challenges. Making provisions to limit thermal distortion calls for many cooling passages, high quality materials, and new fabrication schemes and techniques. Thermal designs for a 700 MHz linac are presented, along with results of prototype tests and fabrication developments which offer solutions to all of these problems.