eFFAG design study

eFFAG design study

YUASA, Yoshimasa

Working Group 3

Collaborators• NHVC

– Baba, Yuasa, Takahashi

• MELCO– Nagayama, Tanaka, Ishi

• MHI– Yoshida

• KEK – Kurokawa, Mori, Taki, Win, Yonemura

• Hiroshima Univ.– Okabe

Motivation

• Sterilization– 10MeV electron accelerator

• IBA Rhodtron– TT300 (10MeV, 200kW)

Goal• The eFFAG must be beyond IBA Rhodtron• Requirements for 10MeV, 200kW eFFAG

– Energy 100keV-10MeV– Average/Peak current 20mA/100mA– Duty 20%– Outer diameter <3m– Power consumption <500kW– Weight <11 ton– Cost <¥500M

View in Goal

• Based on FFAG03 design

Works• Optics design

– Linear optics

• Injection scheme– Base on FFAG03 work

• Induction acceleration– Core design

• Magnet design– Distributed coil model

• Extraction scheme– Massless septum

Optics

• Linear optics (hard edge)

Optics

• Parameters

Induction acceleration

• Core design

Magnet

• Distributed coil model

y = 0.4132x1.607

R2 = 1

0.0

100.0

200.0

300.0

400.0

500.0

600.0

700.0

800.0

10.0 30.0 50.0 70.0 90.0 110.0radius (cm)

Bz (G)

It is K=1.6 !

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Extraction

• Massless Septum– FFAG03

Extraction

• Massless septum– Resonance

1.95

2

2.05

2.1

2.15

2.2

2.25

0.7 0.75 0.8 0.85 0.9 0.95 1 1.05

Radius [m]

Horizontal Tune [-]

with massless septum

without massless septum

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View

Summary• 10 MeV eFFAG is promising…• Parameters

– Energy 100keV-10MeV– Outer diameter 2.3m < 3m– Average/Peak current 20mA / 100mA– Duty 20%– Repetition 5kHz– Power consumption <500kW– Weight 8ton < 11ton– Cost ¥300M < ¥500M– 40% cost down!!!