″

contents PRISM ┘

PRISM

µ-+N(A,Z) -+N (A,Z)

= Phase RotatedIntense Slow Muonsource

µ ″

t

P

t

P┞ ㌹

2.0~3.0%

μ μ

π μ

PRISMμ: 1011-1012μ/sec

:68MeV/c:±2.0-3.0%

π :π<10-18

µ-+N A,Z -+N A,ZSensitivity~10-18

さ(□ )

Capture section (1)

R

B[T]target

incidentproton

PT=240MeV/ccapture solenoid さB R

PT(GeV/c)<0.3B(T)R/2(m)

B=16Tcapture solenoidR=10cm

π

π+,π-

π

240MeV/c

Capture section (2)

さ 68MeV/cπ

π

16T(forward)(backward) π

target

incidentproton

forwarddetector backward

detector

さ π

π+,π-

Matching section

Pt

capture solenoid

π

matching section decay solenoid

( PT PL )

R

FFAG μPT

さ

B

PTPL

BC

BD

PT(GeV/c)<0.3B(T)R/2(m)

π

BCRC2 = BDRD

2 = const.

PT2/BC = PT’2/BD = const.

Matching section

┘

PRISMμFFAG

horizontal 35000πmm*mrad vertical 6500πmm*mrad

┞ ㌹

54.4<Ptot<81.6 MeV/c

ΔT<10 nsec

μ

P

tΔT

54.4

81.6

MeV/c

nsec

:┞

x×arctan(pX/pZ)×π:┞

さ

target

decay solenoid

capture solenoid

incidentproton

GEANT 4.6.2 GHEISHA

:

matching section

:50GeV

πμ

target

decay solenoid

capture solenoid

50GeVproton

matching section

15cm

8T16T T

16T

60cm 100cm 870cm

15cm

28.8cm

10cm0.5cm

㈻solenoid

Detector スよ decay solenoid

Decay solenoid10m ス

Typical event

Draw by Wired

1)2)capture solenoid,matching solenoid3) ㍂ ぜ4)3) ├ ぜ

1

3 4

2㍂

㍂

㍂

㍂

Decay solenoid

Ⅴ μ-

12559[μ-/105proton]

μ- μ+ π- π+ e- e+ p p-

Decay solenoid μ-

X vs arctan(px/pz) Y vs arctan(py/pz)

rX=44mmrX’=800mrad

rX=11mmrY’=600mrad

Horizontal:35000π[mm mrad]Vertical:6500π[mm mrad]

1922μ-/105proton

54.4MeV/c<PTOTAL<81.6MeV/cΔt=10nsec

139μ-/105proton

tof cut60[ns]<tof<70[ns]

54.4MeV/c<PTOTAL<81.6MeV/c

RISM μμ

139μ-/105proton×1014proton/s(J-PARC phase1) 1.4×1011μ-/sμ N N sensitivity 4.8×10-19 (5years)×1014proton/s(J-PARC phase2) 5.6×1011μ-/sμ N N sensitivity 1.2×10-19 (5years)

atching solenoid decay solenoidμ