PRISM-FFAG

PRISM Working Group

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• ┞ ㌹• PRISM RF さ• PRISM RF System• PRISM RF AMP ••

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┞ ㌹

Δp/p = ±20%time

Energy

Small ΔE

time

Energy

Large ΔE

Δp/p = ±3%

•RF Field ┞ ㌹

PRISM(=Phase Rotation Intense Slow Muon source):µ-e conversion

さ

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60%

Time(µs)

68MeV/c

1. 2.5µs@68MeV/c1µs ┞ ㌹ 60%

2. Bucket Height(ΔEMAX) RF

ΔEMAX =

±20% ┘

PRISM-FFAG Ring•200kV/m@5MHz

•100Hz ㌹(Duty 0.1%)

PRISM RF さ (1)

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さ RFProton Synchrotron RF System

0

10

20

30

40

50

60

0 2 4 6 8 10 12

Frequency (MHz)

Fie

ld G

radie

nt

(kV

/m)

SATUNE

MIMAS

CERN PSB

CERN PS

AGS

ISIS

KEK BSTR

KEK PS

JKJ!50GeV MR

JKJ!3GeV RCS

50GeV MR Upgrade

KEK-HGC

J-parc 50GeV MR

J-parc 3Gev RCS

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RPISM RF さ (2)RF 5MHz, 250kV/m

Δp/p=±3%

±5ns Muon width at given momentum

Geant3 Simulation result by A.Sato

RF

phase(nsec) phase(nsec)

Δp/p=±8%

1 2 3

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さ• (200kV/m)

さ

( MHz)┑

RpCL

ERF

HRF HRF

wRF=1/ L*C)

㊪

Duty0.1%•Core ス (air cooling)•┷

RF core さ

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PRISM-FFAG RF

Air cooling (Duty 0.1%)Cooling1.7m × 1.0m (Inner 1m × 0.3m)Size of core33cmLength0.9kΩ/gapImpedance6 cores/gap# of cores5 gapsGaps/Cavity150-200kV/mField Gradient

4CW100,000E, DC33-37kV,1.5MW(peak for 10µs),Max Current 60A

Power Tube

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RF Magnetic Cores

Magnetic Alloys

Ferrites

Requirements for PRISMB=V/ωS=10kV/(2π×5MHz×3.5cm×30cm)=300Gauss

µQf

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MA Core for PRISM RF

1.7m1.7m

3.5cm

1m

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PRISM MA Core (2)

148Ω

213Ω252Ω

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PRISM RF System•

•5gaps•6 MA Cores/gap•33cm/gap

•8 ├•Duty 0.1%

33cm

7cm

µ-Beam3.5cm

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PRISM RF AMP

㊪

㌹ C.G┷ 1.5kW

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PRISM RF AMP R&D• 2003 RF System ″• PRISM AMP モ (

734Ω) Test RF System

Cavity

AMP

S.GPS

C.GPS

AnodePS

Include 10cores

M-Experimental Hall, RCNP,Osaka-Univ.

CavityPower Supply

AMP

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PRISM RF AMP •43kV/gap 734Ω

•スゝ ┘(60A RF current)

86.6kVp-p

PRISM RF Cavity(0.9kΩ)予想される性能(テスト結果から推測)

55kV/gap

165kV/m

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PRISM Cavity Design

APS

AMP

Cavity

By C. Ohmori, Y. Kuriyama

Beam Pipe

Side View

33cm

1 Gap モ PRISM 2004

APSBeam Pipe

AMP

Cavity

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• PRISM RF System R&D• ″ MA Cores• モ

RF 5MHz 43kV

• ┘ PRISM RFCavity

2005 モ