LOW LEVEL RF S YSTEM OF THE LIGHT P ROTON THERAPY LINAC D. Soriano Guillen G. De Michele S. Benedetti Y. Ivanisenko M. Cerv AVO -ADAM Meyrin Switzerland

2025-05-02 0 0 606.37KB 4 页 10玖币

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LOW LEVEL RF SYSTEM OF THE LIGHT PROTON THERAPY LINAC

D. Soriano Guillen†, G. De Michele, S. Benedetti, Y. Ivanisenko, M. Cerv, AVO-ADAM, Meyrin,

Switzerland

Abstract

The LIGHT (Linac for Image-Guided Hadron Ther-

apy) project was initiated to develop a modular proton ac-

celerator delivering beam with energies up to 230 MeV for

cancer therapy. The machine consists of three different

kinds of accelerating structures: RFQ (Radio-Frequency

Quadrupole), SCDTL (Side Coupled Drift Tube Linac) and

CCL (Coupled Cavity Linac). These accelerating struc-

tures operate at 750 MHz (RFQ) and 3 GHz (SCDTL,

CCL). The accelerator RF signals are generated, distrib-

uted, and controlled by a Low-Level RF (LLRF) system.

The LIGHT LLRF system is based on a commercially

available solution from Instrumentation Technologies with

project specific customization. This LLRF system features

high amplitude and phase stability, monitoring of the RF

signals from the RF network and the accelerating structures

at 200 Hz, RF pulse shaping over real-time interface inte-

grated, RF breakdown detection, and thermal resonance

frequency correction feedback. The LLRF system control

is integrated in a Front-End Controller (FEC) which con-

nects it to the LIGHT control system. In this contribution

we present the main features of the AVO LLRF system, its

operation and performance.

INTRODUCTION

AVO-ADAM designed and is currently commissioning

the LIGHT (Linac for Image Guided Hadron Therapy) pro-

ton cancer therapy LINAC [1], which is a modular normal

conducting RF accelerator fed by 4 Inductive Output

Tubes (IOTs) and 13 klystrons grouped in 14 power sta-

tions. At each power station the RF power can be modu-

lated independently every pulse. The pulse repetition rate

is 200 Hz allowing accurate dose delivery within tumour

volume and longitudinal layer switching on a pulse-to-

pulse basis, given the low emittance of the proton beam.

These features of the LIGHT LINAC are key to have im-

age-guided adaptative radiation therapy with protons [1].

The modular structure of the LIGHT system consists of:

• A proton source injecting 40 keV protons with cur-

rents up to 300 uA and pulses up to 20 us at 200 Hz

repetition rate.

• an RFQ (Radio Frequency Quadrupole) with a reso-

nant frequency of 749.48 MHz accelerating the pro-

tons up to 5 MeV. This is the fourth sub-harmonic of

the 2997.92 MHz LINAC frequency. The RFQ is fed

by an IOT powering system driven by the first LLRF

unit. Several signals are monitored in the LLRF from

the RFQ system: 4 probe signals from the RFQ cavity

and 4 pairs of directional couplers (forward and re-

flected power) in the RF network.

• Four SCDTL (Side Coupled Drift Tube LINAC) struc-

tures powered by two klystrons at the main LIGHT fre-

quency of 2997.92 MHz. Passing through the four

SCDTL cavities, the beam will accelerate to 37.5

MeV. A SCDTL RF unit consists of a LLRF driving

power to a Modulator Klystron System (MKS) that

amplifies the 5 microseconds duration RF pulses to

MW levels. From each SCDTL RF unit, the associated

LLRF receives 4 probe signals (2 per cavity) and 3

pairs of directional couplers (forward and reflected)

signals in the RF network. The power is split from

main line and there is a coupler on each branch before

the SCDTL cavities.

• Fifteen CCL (Coupled Cavity LINAC) structures pow-

ered by eleven klystrons at 2997.92 MHz, bringing the

beam energy up to 230 MeV. Four CCL RF units split

power between two CCL cavities and the other six are

fed directly from the MKS. In the first case, the asso-

ciated LLRF receives 4 probe signals (2 per cavity)

and 3 pairs of directional couplers (forward and re-

flected) signals in the RF network (as in the SCDTL

case); and in the latter case only 2 probe signals from

the cavity and 2 pairs of directional couplers are re-

ceived.

Figure 1 shows a schematic view of the LIGHT LINAC

design. The three types of RF accelerating cavities are

highlighted with the final energy at each section. The RF

peak power required for the RFQ, SCDTL and CCL units

is 400 kW, 8 MW and 45 MW respectively [2].

Figure 1: LIGHT system schematic with expected beam

energy reached after each type of RF accelerating cavity

section.

The LIGHT beam production system is currently be-

ing commissioned at AVO-ADAM Daresbury integration

site (DIS) in UK.

LLRF SYSTEM DESCRIPTION

Each high-power RF unit is fed by a LLRF device, which

makes a total of 14 LLRF units for the whole LIGHT

LINAC. The LLRF system has been built and delivered by

Instrumentation Technologies [2] and on top of the LLRF

device units, it’s composed of a Reference Master

________________________________________

† d.soriano@avo-adam.com

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摘要：

LOWLEVELRFSYSTEMOFTHELIGHTPROTONTHERAPYLINACD.SorianoGuillen†,G.DeMichele,S.Benedetti,Y.Ivanisenko,M.Cerv,AVO-ADAM,Meyrin,SwitzerlandAbstractTheLIGHT(LinacforImage-GuidedHadronTher-apy)projectwasinitiatedtodevelopamodularprotonac-celeratordeliveringbeamwithenergiesupto230MeVforcancertherapy.Themachi...

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LOW LEVEL RF S YSTEM OF THE LIGHT P ROTON THERAPY LINAC D. Soriano Guillen G. De Michele S. Benedetti Y. Ivanisenko M. Cerv AVO -ADAM Meyrin Switzerland

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