SksMinus status SKS meeting 2008/1/18 白鳥昂太郎. SksMinus setup SksMinus STOF :...
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Transcript of SksMinus status SKS meeting 2008/1/18 白鳥昂太郎. SksMinus setup SksMinus STOF :...
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
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 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
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
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 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.
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 )
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