IPAC'23 - 14th International Particle Accelerator Conference

The IFMIF RFQ as a resonant combiner: equivalent circuit and operational scenarios

MOPL128

8 May 2023, 16:30

2h

Sala Laguna

Poster Presentation MC1.A08: Linear Accelerators Monday Poster Session

Speaker

Antonio Palmieri (Istituto Nazionale di Fisica Nucleare)

Description

The IFMIF RFQ has to accelerate a D+ beam of 125 mA
from the source energy of 100 keV to its final energy of 5
MeV. For such a purpose, the needed RF power
(approximately 600 kW dissipated power and 600 kW beam
power) is injected in the RFQ from 8 amplifier chains with
8 coupling loops. In order to quantitatively understand the
different circumstances which can occur, an equivalent
circuit of the RFQ (that can be generalized to a generic multple-feed cavity) with all the feed lines and couplers will
be described, and the expressions for cavity and reflected
voltages and powers will be derived. Moreover, some operational
scenarios that can occur will be analyzed. In particular
errors in amplitude phase and coupling of each of the 8 feed
lines of the RFQ itself will be introduced. This analysis is also useful as a guideline in determining the basic architecture of the amplitude/phase controls of the cavity feeds, for a given set of amplifier amplitude/phase characteristics.