Upgrade of the 4-rod radio frequency quadrupole for SARAF Phase II Linac

Abstract

The 176 MHz 4-rod radiofrequency quadrupole (RFQ) is the crucial part of the Soreq Applied Research Accelerator Facility (SARAF) injector and must be able to operate at RF powers up to 190 kW continuous wave and transport 5 mA proton and deuteron beams. The SARAF Phase I RFQ is planned for use in Phase II. The period between the termination of Phase I and the installation of Phase II provided an opportunity to introduce RFQ improvements to fully meet the Phase II requirements. These upgrades and improvements are presented in this report together with the results of the recent conditioning campaigns.

Beam commissioning of the SARAF Injector and MEBT (protons)

“…The last major modification of the RFQ was performed in 2017 when the new rod structure was installed and put into operation [10]. However, a few additional improvements and studies have been conducted since the completion of Phase I to enhance the RFQ performance [11]. These improvements included the study and optimization of ceramic materials for coupler windows, upgrades to the water interface flanges, improvements in the design of the exit end flange, and optimization of the water cooling circuit.…”