X-Band Accelerator Section
Component Specification Sheet
NLC Main Linac Systems
Component X-Band Accelerator Section
| Description: 1.8 m long Rounded, Damped-detuned Structure (RDDS) used in the NLC X-band linacs. "Y" style input rf coupler; double horizontally symmetric output couplers each terminating in water cooled high power rf loads. Internal and external HOM loads. Average unloaded gradient of 72.3 MV/m, effective loaded gradient of 55 MV/m. A diffusion brazed assembly of 206, longitudinally coupled copper cells 60 mm OD and 8.75 mm thick which are precision machined to micron tolerances. Integral to the assembly are rf bpm feedthrus brazed to the HOM manifolds. Vacuum pumping is symmetric to both sides of the structure to stabilize vacuum loads. |
| Electrical Design: | Wang, et. al |
| Mechanical Design: | Wang, et. al |
| Number Required: | 4968 (2484 per linac) |
| Length: | 1.8 m (+7.1 cm for noses) |
| Material | OFE F68-93 MET CL1 ASTM B170-93 |
| Weight: | 36.2 kg |
| Straightness Tolerance: | ±20 mm |
| Vacuum: | 5x10-9 torr |
| Operating Frequency: | 11.424 gHz |
| Unloaded Operating Gradient: | 72.3 MV/m |
| Breakdown Gradient: | note (1) |
| Average Operating Temperature: | 450 C |
| Temperature Control: | Water |
| Water flow: | 16 GPM |
| Input Water Temperature: | 44.40 C |
| Output Water Temperature: | 45.60 C |
| note(1): <3 breakdowns/hr at operating gradients |
Conceptual Specification for Planning Purposes Only
Not for Engineering Release