RF Design of a High-frequency RFQ Linac for PIXE Analysis

750 MHz radio frequency quadrupole with trapezoidal vanes for carbon ion therapy

“…Both methodology and choices of the rf design of the four-vane Carbon-RFQ were adapted from the HF-RFQ [7][8][9][10][11] and PIXE-RFQ [9,[12][13][14]-the obvious exception being the novel dipole mode detuning discussed in Section III A. Here, we summarize the remaining rf design considerations, including cavity geometry (Section IV A), maximum surface electric field (Section IV B), auxiliaries and power couplers (IV C), and thermal simulations (IV D).…”

“…The average water speed in the cooling channels amounts to 1 m/s, corresponding to a convection coefficient of 3900 W/m 2 /K. Two configurations are compared: a design with two channels per vane, used by the HF-RFQ and the PIXE-RFQ [12,13], and a new design with only one channel per vane. The plot highlights that the difference between the two options is only marginal, such that the mechanically simpler design with one channel per vane is selected.…”

“…The rf design is based on the experience gained with the HF-RFQ and PIXE-RFQ [9,[12][13][14]. However, with a length of 475 cm ≈ 12λ being more than twice as long as the HF-RFQ, the Carbon-RFQ had to be split into two separate rf cavities to ensure a stable field distribution.…”

rf measurements and tuning of the 1-meter-long 750 MHz radio-frequency quadrupole for artwork analysis

“…After successful design, construction, and commissioning of the HF-RFQ, a compact 750 MHz radio-frequency quadrupole (RFQ) for medical applications [1][2][3][4][5][6][7][8], CERN initiated the development of a new RFQ operating at this high frequency in mid-2017. The so-called PIXE-RFQ [3,[8][9][10][11] will accelerate protons to 2 MeV over a length of one meter only. A CAD model is shown in Fig.…”