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X 核スペクトロスコピー ー K1.8 B.S. & SKS ー. 高橋 俊行 KEK J-PARC Online/DAQ W.S. Contents. X 核スペクトロスコピー 装置  K1.8 Beamline と SKS High rate での Chamber の考察 必要な回路のチャンネル数 まとめ. X Hypernuclear Spectroscopy. X potential in nuclei X -N interaction (S= - 2 Baryon-Baryon Int.)

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X k1 8 b s sks

X核スペクトロスコピーー K1.8 B.S. & SKS ー

高橋 俊行

KEK

J-PARC Online/DAQ W.S.


Contents
Contents

  • X核スペクトロスコピー

  • 装置 K1.8 Beamlineと SKS

  • High rateでのChamberの考察

  • 必要な回路のチャンネル数

  • まとめ


X hypernuclear spectroscopy
X Hypernuclear Spectroscopy

  • X potential in nuclei

    • X-N interaction (S=-2 Baryon-Baryon Int.)

    • E.O.S. of Neutron Star Core

  • XN-LL(-H) Mixing

    • ~28MeV difference XN-LL

    • ~75MeV for L-S

    • ~300MeV for N-D


実験方法

  • (K-,K+) reaction spectroscopy

    • p + K-->X- + K+

    • P(K-) = 1.8GeV/c measured by B.S.

    • P(K+) = ~1.3GeV/c measured by SKS

    • 2-3 MeV/c2(FWHM) resolution

  • Target mass dependence

    • CH2, 12C, 28Si, 51V, ..., 208Pb


Theretical prediction
Theretical Prediction

2MeV FWHM Resolution

58Ni(K-,K+)

208Pb(K-,K+)

Folding

Folding

Wood-Saxon

Wood-Saxon

V0=-24MeV

V0=-24MeV

V0=-16MeV

V0=-16MeV

X- bound region

X- bound region

MHY-MA [MeV]

MHY-MA [MeV]


Hadron hall layout
Hadron Hall Layout

Ref. Cntrl. Hat

Elec. Hat

Upgraded SKS

K1.8

K1.1BR

FF

ES2

MS2

Beam

Spectrometer

ES1

T1

KL

K1.1


K1 8 beamline
K1.8 Beamline

K- + p-

K decay x 3

pの混入 x 2

Beam Spectrometer上流側


Wire chamber
Wire Chamberでどこまで測れるか?

  • 現在のK6/SKSの状況

  • 5mm cell size DC

  • 3.6Mp+/Spill (Spill=1.4sec)

  • p/p+ ~0.1

  • [email protected] ~10cm

  • drift time ~50ns

  • t ~ 75ns

Singles Rateは?

Total

/ wire

200kHz/wire を目標にすると

3mm cell size

10cm beam size

ext. time ~0.6 sec

B.S.の下流側はOK


MWPCでは?

1mm MWPC

10cm beam size

cluster sizeが1となれば、rate的にも

位置分解能的にも問題はない。

実際には、斜め入射やAccidentalでCSが大きくなるかも?

  • ノイズを落とすため、時間情報も欲しい。

  • Trigger前後100ns程度のON/OFF情報

    • 10ns程度の分解能で

  • Multi-hit TDCでL.E./T.E.をWire毎に記録する。


Beam spectrometer @ k1 8bl
Beam Spectrometer @ K1.8BL

FF

BAC1,2

  • QQDQQ Spectrometer

  • VI->VO point to point optics

    • <X|q> = 0

    • <X|X> = -0.44

    • <X|d> = 1.57cm/%

BH2

VO

BC3,4

Q

Q

Dp/p ~1.4x10-4

sx~0.2mm

D

BC1,2

Q

MS2

Q

VI

BH1


Detectors of beam spectrometer
Detectors of Beam Spectrometer

Multi-timingのMWPC encoding systemかDrift Chamber的な読出し

HR-TDCのほかに

Multi-hit TDCでの

読出しも行いたい。

(Rateの高いCounter)


K1 8 spectrometer sks
K1.8 Spectrometer (SKS)

SKS

(395A,2.7T)

New Dipole

Magnet

~1.5T

30cm gap

950 mm

Total Bend Angle

85 degree

DC4

DC5X

DC5Y

r=1325mm

DC3

DC2

DC1

TOF

AC1

LC

AC2


Detectors of sks wire chambers
Detectors of SKS (wire chambers )

read by multi-hit TDC

both Leading Edge & Trailing Edge

Dt~0.5ns, F.S. 2-5msec, 16depths


Detectors of sks pmts
Detectors of SKS (PMTs)

Read by ADC & HR-TDC (25ps/ch)


まとめ

  • X Hypernuclear Spectroscopy @ K1.8

    • Beam Spectrometer & Upgraded SKS Spectrometer

  • Rateに強く、物質量の少ない位置検出器が重要

    • 1mm MWPC

    • 3mm DC

    • Max 200kHzに耐えうる回路(Amp-Shaper-Discri.)

  • 必要なチャンネル数

    • 6000 ch. for wire chamber (Multi-hit)

      • 2500 for MWPC

    • 200 ch. for PMTs (ADC, HR-TDC)


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