Download presentation
Presentation is loading. Please wait.
Published byEsmond Dixon Modified over 9 years ago
1
SksMinus status SKS meeting 2008/1/18 白鳥昂太郎
2
SksMinus 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/cm 2
3
SksMinus 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 : 4 He target
4
In progress
5
Drift chambers BD (SDC3&4) SDC1&2
6
BD 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
7
BD status Plateau : 1950~2250 V → 2150 V operation Uniform wire tension
8
BD 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 ?
9
SDC1 and 2 SDC1 : SksPlus SDC2 (400×200 mm 2, 3mm spacing, xxuuvv planes) After Okamura’s chamber ? SDC2 : Old SDC2 (560×150 mm 2, 5 mm spacing, xxuu planes) Test and repair from Jun (or after ?)
10
Frame and readout electronics 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
11
Schedule 12 34 567 8 910 1112 Freiberg BNL repair test repair test Frame Design Production Readout (cable, connector) SDC2 repairtest SDC1????? Design Production and test
12
STOF, SMF, BH2
13
STOF BT cannot be used…. t ~100 ps(rms), 30 cm attenuation length t ~100 ps(rms), 30 cm attenuation length Present SKS TOF counter t ~80 ps(rms), 100 cm attenuation length t ~80 ps(rms), 100 cm attenuation length ⇒ To 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 now The similar design with present SKS TOF frame The similar design with present SKS TOF frame BH2 and BP : Just production
14
SMF (K→ veto) Timing counter FTOF(KURAMA) + BT BT×14 segments Iron block Iron beam shield Frame design is not difficult. BT test ⇒ Usable. SMF Iron block BT FTOF
15
BH2 & BP BH2 : Start counter (time zero) 1 segment with booster PMT 1 segment with booster PMT BP : Beam decision counter 1 segment : Fiber readout ? 1 segment : Fiber readout ? Target BH2 BAC1BAC2 SAC Beam BP
16
Design SP0 SAC, BAC Target
17
SP0
18
SP0 (K→ 0 veto) Beam decay background veto SP0 : - from K - → - + 0 Performance 80% of events rejected (enough) 80% of events rejected (enough) Accidental hits from background Multi-layer hit, total energy deposit Multi-layer hit, total energy deposit OK : Neutron, low energy gamma, mesonic-decay OK : Neutron, low energy gamma, mesonic-decay Other charged particles ⇒ Charge veto Other charged particles ⇒ Charge veto NO : Mesonic-decay : 0 (~20% kill @ 4 He) NO : Mesonic-decay : 0 (~20% kill @ 4 He)
19
SP0 design 12 34 567 8 910 1112 designeasy test ? production Range counter disassembly Range counter (E559) based Scinti 、 PMT: OK + (Iron shield) Scinti 、 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 ?
20
AC counters SAC, BAC
21
AC design Index : n=1.03 ~4 photons BAC1,2 160×30×75 mm 160×30×75 mm SAC1 : 300×90×75 mm 300×90×75 mm SAC2 : 360×100×75 mm 360×100×75 mm With 2 inch fine mesh PMT ~72 mm)×8 Inside : White box, w/ or w/o reflector Design and test start from Mar
22
AC test and schedule To test largest size (SAC2: 360×100×75 mm) Cosmic ray test Cosmic ray test Efficiency by LNS beam Efficiency by LNS beam Inside w/ or w/o reflector Inside w/ or w/o reflector Other In-beam test ? Other In-beam test ? 12 34 567 8 910 1112 designproduction test improvement test improvement test improvement
23
4 He target Target size : 150 mm×250 mm No progress Just start to design (E549, E570 target)
24
Summary 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.
25
Others
26
SKS 移動 : 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 )
27
SKS 移動 : 油圧ジャッキ, 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。
28
Readout channels DC : total 2608 ch (T) SDC1 (xxuuvv) : 128 ch×6 = 768 ch SDC1 (xxuuvv) : 128 ch×6 = 768 ch SDC2 (xxuu) : 112 ch×4 = 448 ch SDC2 (xxuu) : 112 ch×4 = 448 ch SDC3 (xxuuvv) : 108 ch×2 + 120 ch×4 = 696 ch SDC3 (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) STOF : 30 segment : 60 A&T STOF : 30 segment : 60 A&T BH2, BP : 2 ch×2 = 4 A&T BH2, BP : 2 ch×2 = 4 A&T Veto counter : total 88 ch (A&T) SMF : 24 + 14 segments : 38 A&T SMF : 24 + 14 segments : 38 A&T SP0 : 5 segments×10 layers : 50 A&T SP0 : 5 segments×10 layers : 50 A&T AC : total 8 ch (A&T) SAC : 2 ch×2 = 4 A&T SAC : 2 ch×2 = 4 A&T BAC : 2 ch×2 = 4 A&T BAC : 2 ch×2 = 4 A&T TKO TDC 32 ch TDC×82 TKO ADC 16 ch ADC×10 HR TDC 16 ch TDC×10
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.