Power handling capability of water cooled cw linac structures

U.S. Linear Collider Technology Options Study

“…All magnet supplies for both warm and cold use an MTBF of 200,000 hours instead of the [40][41][42][43][44][45][46][47][48][49][50] thousand hours experienced at SLAC and Fermilab. This comes from a design done for the TESLA TDR which has redundant regulators (which are the most common component to fail in a power supply) and hence an MTBF that depends mostly on the low power components and bulk supply which were not made redundant.…”

“…The TESLA TDR capture and PPA sections are based on the CDS structures [45]. These structures are standing wave π-mode structures with magnetic coupling slots.…”

Continuous-wave electron linear accelerators for industrial applications

“…In addition to the factors listed above, the frequency shift caused by deformations of the AS depends on the structure design and arrangement of the cooling channels. In the case of circumferential cooling of the structure, the shift can be 2-3 times greater than the shift caused by mean temperature increase, whereas with additional cooling channels, placed in the webs, separating accelerating and coupling cells [11], the shift can be negligible.…”

“…The maximum accelerating gradient for NC AS is limited by achieving a material yield point due to temperature gradient or by local boiling of the coolant. The experimentally proven limit of rf losses per unit of length is 210 kW=m [11], which corresponds to the accelerating gradient of about 3.5 MeV=m.…”

“…Steering coils and solenoidal lens are located over the structure. The accelerator vacuum is provided by the 100 l=s ion pump (5), an additional 25 l=s ion pump (11) and a sputter-ion pump of the electron gun. Depending on beam applications, different systems can be installed at the output of the accelerating structure.…”