SksMinusSksMinusstatusstatus

SKS meeting

2008/1/18

白鳥昂太郎

SksMinus setupSksMinus setup

SksMinus

STOF : Time-of-flight SAC & BAC: K- beam

veto and - ID (n=1.03)

SDC1~4 :Beam position measurement

Background Veto

SMF : - from K- → - + SP0 : - from K- → - + 0

_

Target ~20 g/cm2

SksMinus elementsSksMinus elements

Test and production in progress Drift chambers : BD(SDC3,4), SDC1,2 Timing counters : STOF, BH2 Beam decay veto counters : SMF

Design Aerogel Cherenkov counters : BAC, SAC Beam decay veto counters : SP0 Targets : 4He target

In progressIn progress

Drift chambersDrift chambers

BD (SDC3&4)

SDC1&2

BD repair statusBD repair status

Freiberg (XX,UU,VV) 3 layers finished (X,U,V) The other 3 layers : repair in Jun → Test in Feb

BNL (XXXX,UU,VVV → XX,UU,VV) Feb ~ Apr : repair Apr ~ May : test

Repair routine is fixed.

All sense wire exchange : 20 m → 25 m

BD statusBD status

Plateau : 1950~2250 V → 2150 V operation Uniform wire tension

BD testBD test Efficiency and resolution test by cosmic ray

FUJI beam line ?

DAQ with TKO MHTDC Test and study how to use TKO MHTDC 3377 by CAMAC is easy…

Goal : Less than 400 m (rms) resolution(~300 m is possible)

＊ Where do we test ? East counter hall ?⇒

SDC1 and 2SDC1 and 2

SDC1 : SksPlus SDC2 (400×200 mm2, 3mm spacing, xxuuvv planes) After Okamura’s chamber ?

SDC2 : Old SDC2 (560×150 mm2, 5 mm spacing, xxuu planes) Test and repair from Jun (or after ?)

Frame and readout Frame and readout electronicselectronics Frame (Upstream and Down stream)

Not yet designed : SKS configuration, common frames ?

Plan of production : From Jun

Readout electronics Fryeburg : Special preamp with modification BNL : Present readout with modification SDC1 and SDC2 : Present readout

⇒ TKO TDC

ScheduleSchedule1 2 3 4 5 6 7 8 9 10 11 12

Freiberg

BNL

repair test

repair test

FrameDesign Production

Readout(cable, connector)

SDC2repair test

SDC1 ?????

Design Production and test

STOF, SMF, BH2STOF, SMF, BH2

STOFSTOF BT cannot be used….BT cannot be used….

t ~100 ps(rms), t ~100 ps(rms), 30 cm30 cm attenuation length attenuation length Present SKS TOF counterPresent SKS TOF counter

t ~80 ps(rms), 100 cm attenuation lengtht ~80 ps(rms), 100 cm attenuation length

⇒⇒To add Present SKS countersTo add Present SKS counters Present 15 segments STOF 30 segments⇒Present 15 segments STOF 30 segments⇒ + 15 segments+ 15 segments

Frame design and production : From nowFrame design and production : From now The similar design with present SKS TOF frameThe similar design with present SKS TOF frame

BH2 and BP : Just productionBH2 and BP : Just production

SMF (K→SMF (K→ veto) veto)

Timing counterTiming counter FTOF(KURAMA) + BTFTOF(KURAMA) + BT BT×14 segmentsBT×14 segments

Iron blockIron block Iron beam shieldIron beam shield Frame design is not difficult.Frame design is not difficult.

BT test Usable.⇒BT test Usable.⇒

SMF

Iron block

BT

FTOF

BH2 & BPBH2 & BP

BH2 : Start counter (time zero)BH2 : Start counter (time zero) 1 segment with booster PMT1 segment with booster PMT

BP : Beam decision counterBP : Beam decision counter 1 segment : Fiber readout ?1 segment : Fiber readout ?

TargetBH2

BAC1 BAC2 SACBeam

BP

DesignDesign

SP0SP0

SAC, BACSAC, BAC

TargetTarget

SP0SP0

SP0 (K→SP0 (K→00 veto) veto)

Beam decay background veto

SP0 : - from K- → - + 0

PerformancePerformance 80% of 80% of events rejected (enough) events rejected (enough)

Accidental hits from backgroundAccidental hits from background Multi-layer hit, total energy depositMulti-layer hit, total energy deposit

OK : Neutron, low energy gamma, mesonic-decayOK : Neutron, low energy gamma, mesonic-decay Other charged particles Charge veto⇒Other charged particles Charge veto⇒ NO : Mesonic-decay : NO : Mesonic-decay : 00 (~20% kill @ (~20% kill @ 44

He)He)

SP0 designSP0 design

1 2 3 4 5 6 7 8 9 10 11 12

design easy test ?

production

Range counterdisassembly

Range counter (E559) basedRange counter (E559) based ScintiScinti 、、 PMT: OK + (Iron shield) PMT: OK + (Iron shield) Light guide or Fiber ?Light guide or Fiber ? Lead : How to get (600 kg)Lead : How to get (600 kg) Frame : How to fix lead ?Frame : How to fix lead ?

AC countersAC counters

SAC, BACSAC, BAC

AC designAC designIndex : n=1.03Index : n=1.03~4 photons~4 photons BAC1,2BAC1,2

160×30×75 mm160×30×75 mm

SAC1 : SAC1 : 300×90×75 mm300×90×75 mm

SAC2 :SAC2 : 360×100×75 mm360×100×75 mm

With 2 inch fine mesh PMTWith 2 inch fine mesh PMT

~72 mm)×8~72 mm)×8

Inside : White box, Inside : White box,

w/ or w/o reflectorw/ or w/o reflector

Design and test start from MarDesign and test start from Mar

AC test and scheduleAC test and schedule

To test largest size (SAC2: 360×100×75 mm)To test largest size (SAC2: 360×100×75 mm) Cosmic ray testCosmic ray test Efficiency by LNS beamEfficiency by LNS beam Inside w/ or w/o reflector Inside w/ or w/o reflector Other In-beam test ?Other In-beam test ?

1 2 3 4 5 6 7 8 9 10 11 12

design production

test

improvement

test test

improvement

test

improvement

44He targetHe target

Target size : Target size : 150 mm×250 mm150 mm×250 mm

No progress No progress Just start to designJust start to design

(E549, E570 target)

SummarySummary

Three important elements BD in progress : 1 detector finished in February. SP0 design will be finished soon. He target is just designed stage.

Other elements Timing counters are production stage.

: STOF, SMF, BH2, BP AC counters (BAC and SAC) are designed stage.

OthersOthers

SKSSKS 移動 移動 : Pivot: Pivot

ピボット。ここに回転中心用ジグを設置

支持装置を設置

設置前 設置後

支持装置 (L字 )

回転中心

To produce SksMinus 支持装置 (L 字 )

SKSSKS 移動 移動 : : 油圧ジャッキ油圧ジャッキ , , 腕腕油圧ジャッキ用の腕

設置前 設置後腕

油圧ジャッキ

押すときには上下に動かないように固定するジグが必要。 SKSの壁に付ける。

Readout channelsReadout channels DC : total 2608 ch (T)DC : total 2608 ch (T)

SDC1 (xxuuvv) : 128 ch×6 = 768 chSDC1 (xxuuvv) : 128 ch×6 = 768 ch SDC2 (xxuu) : 112 ch×4 = 448 chSDC2 (xxuu) : 112 ch×4 = 448 ch SDC3 (xxuuvv) : 108 ch×2 + 120 ch×4 = 696 chSDC3 (xxuuvv) : 108 ch×2 + 120 ch×4 = 696 ch SDC4 (xxuuvv) : 108 ch×2 + 120 ch×4 = 696 ch SDC4 (xxuuvv) : 108 ch×2 + 120 ch×4 = 696 ch

Timing counter : total 64 ch (A&T)Timing counter : total 64 ch (A&T) STOF : 30 segment : 60 A&TSTOF : 30 segment : 60 A&T BH2, BP : 2 ch×2 = 4 A&TBH2, BP : 2 ch×2 = 4 A&T

Veto counter : total 88 ch (A&T)Veto counter : total 88 ch (A&T) SMF : 24 + 14 segments : 38 A&TSMF : 24 + 14 segments : 38 A&T SP0 : 5 segments×10 layers : 50 A&TSP0 : 5 segments×10 layers : 50 A&T

AC : total 8 ch (A&T)AC : total 8 ch (A&T) SAC : 2 ch×2 = 4 A&TSAC : 2 ch×2 = 4 A&T BAC : 2 ch×2 = 4 A&TBAC : 2 ch×2 = 4 A&T

TKO TDCTKO TDC32 ch TDC×8232 ch TDC×82

TKO ADCTKO ADC16 ch ADC×1016 ch ADC×10

HR TDC HR TDC 16 ch TDC×1016 ch TDC×10