ILD Workshop 報告

2009 年 2 月 23 日杉本康博

ILD とは

2009 年 3 月末に ILC Research Director (RD)に Letter of Intent (LOI) を提出する予定の３つの測定器の一つ（他は SiD, 4th)

GLD(Asia base) と LDC(EU base) が 2007 年6 月 (LCWS07) に合体

Gas base の central tracker (TPC) と Particle Flow Algorithm (PFA) に最適化されたcalorimeter を持った大型汎用測定器

LOI ILC Detector の “ LOI” とは？

Letter of Intent to go to technical design phase 2009 年 3 月 31 日締め切り International Detector Advisory Group (IDAG) によって

“validate” され、 2009 年 9 月頃に IDAG report が出る Expected LOI content (M.Davier, LCWS08)

約 100 ページ（書き足りない分は supporting documents ） Detector philosophy, sub-detectors and alternatives Evaluation of physics performances based on a common

process benchmark list Integration issues with accelerator Status of a realistic detector model Identification of state, plans and timescale for required R&D and

technological options Preliminary cost estimate Structure of group and capacity to carry out the work Resources needed as function of time for technical design

ILD Workshop 第 1 回

2008 年 1 月 14 日 ~16 日 DESY Zeuthen GLD-LDC 統一に向けた作業の開始

第 2 回 2008 年 9 月 11 日 ~13 日 Cambridge ILD 主要パラメータの決定

第 3 回 2009 年 2 月 16 日 ~18 日 韓国・ソウル、梨花女子大 LOI 直前対策 ~75 人の参加者

Seoul ILD WS の目的

LOI の現状に関する議論 Benchmark reaction の simulation study Detector optimization Sub-detector design Detector integration

LOI 完成に向けて必要な重要項目についての共通認識を持つ

Physics/Optimization session Higgs recoil mass analysis Study of ZH qq ZH qqqq Benchmark analysis of tau-pairs SUSY point 5 chargino & neutralino: part-1 SUSY point 5 chargino & neutralino: part-2 ZHH at 500 GeV WW / ZZ at 1TeV SPS1a’ stau polarization and mass measurement SPS1a’ smuon, chargini, neutralino mass measurement Model independent WIMP search Non-pointing photons as signature for GMSB Photon reconstruction in the ECAL Higgs branching ratios for ZH llqq Polarization measurement from WW Measurement of littlest higgs parameters at ILC LHC/ILD SUSY fitting Top pair production-1 Top pair production-2

•Simulation study は GRID を活用•しかしリソースの大部分は EU (DESY, Lyon) にあり、 KEK の 寄与は小さい

Sub-detectors session

Vertex detector Silicon tracker TPC ECAL Si_W ECAL Scintillator Digital HCAL Analog HCAL FCAL

MDI / Integration session

Progress on the yoke design Integration of sub-detectors Detector magnet design Design principle of beam pipe Wakefield, loss in the beam pipe Integration discussion Push-pull operation R&Ds after LOI, focused on the engineering tasks

Parallel session

Software tools MDI / Integration Vertex detector Si tracking / General tracking Calorimeter

ILD design in LOI

ILD design in LOI

Vertex detector (VTX) Two options: 5-single layers v.s. 3-doublets Four sensor options: CCD / CMOS / DEPFET / 3D

ILD design in LOI Si trackers

Si internal tracker (SIT: Si strip) Forward tracking detector (FTD: Si pixel/strip) Si external tracker (SET: Si strip) Endcap tracking detector (EDT)

Central tracker Time projection chamber (TPC)

Beam pipe / VTX / SIT / FTD

ILD design in LOI

ECAL 2 options: Si-Tungsten v.s. Scintillator-Tungsten Rin=1.85m ((GLD+LDC)/2) 1cm2 cell size

HCAL 2 options: Sci.-Fe (analog HCAL) v.s. RPC-Fe

(semi-digital HCAL) 3x3cm2 (A-HCAL) or 1x1cm2 (D-HCAL) cell size

ILD design in LOI

Coil / Yoke 3.5 T nominal, 4 T maximum Coil: Rin=3.615m, Rout=4.0m, L=7.35m Cryostat: Rin=3.44 m, Rout=4.34m E=2.73 GJ@4T, E/M=11.9 kJ/kg Stray field: 38 G at R=15 m (limit:50 G at 15m) Magnetic force: 18500 ton on endcap yoke

ILD design in LOI

Integration CMS-like assembly

Barrel: 3 rings / Endcap: 3 parts/side (?) Surface assembly Put down to underground by

2000t crane Endcap opening

Rear part is split into 2 / Front part is one ring Small opening (gap~1m) at beam position Big operation at garage position

ILD design in LOI

ILD proposal of the cavern/shafts

ILD LOI の現状 ~80% 完成（既に 100 ページを超えてしまっ

た） 著者： ~220 (Feb.15)

アジアが非常に少ない今後の増加を期待 ( 努力）

Asia