Frequency jump using 704.4 MHz radio-frequency quadrupole and cross-bar H-type drift tube linear accelerators

A large-scale proton or H? accelerator often requires a jump in radio frequency, typically in the beam velocity range of fi = 0.4?0.6. The MYRRHA linac has two frequency jumps: one at fi = 0.2 and another one in the typical beam velocity range at fi = 0.56. Using the MYRRHA linac as an example, this study investigates two new solutions, whereby the frequency jump in the range of fi = 0.4?0.6 is eliminated. A single frequency jump at fi = 0.2 can shorten the whole linac considerably and reduce the construction and operation costs. The proposed frequency jump sections will use 704.4 MHz radio-frequency quadrupole and cross-bar H-type drift tube linear accelerators. To ensure a safe and reliable cw operation at such very high frequency for these kinds of accelerating structures, careful design studies with respect to beam dynamics and rf structures including water-cooling channels have been performed. The results demonstrated the feasibility of both solutions.

Automated summary

This study explores two new solutions to eliminate frequency jumps in a large-scale proton or H? accelerator, using the MYRRHA linac as an example. By utilizing a single frequency jump at fi = 0.2, the entire linac can be shortened considerably, leading to reduced construction and operation costs. The proposed frequency jump sections will use advanced radio-frequency quadrupole and drift tube linear accelerators to ensure safe and reliable operation at very high frequencies.