Current Status of ATLAS Endcap Muon Trigger System

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1 Current Status of ATLAS Endcap Muon Trigger System Takuya SUGIMOTO Nagoya University On behalf of ATLAS Japan TGC Group Contents 1. Introduction 2. Assembly and installation of TGC 3. Readout test at assembly site 4. Full Big Wheel Test Plan 5. Summary

2 Introduction 2/23 ATLAS Detector General purpose detector for LHC Length:44m Diameter:25m Weight: 7000t Data taking will be started from September 07.

3 ATLAS Trigger System 3/23 software hardware 2.5 μs ~ 10 ms ~ sec. 3 level trigger system 1. LVL1 decision based on data from calorimeters and muon trigger chambers; synchronous at 40 MHz; bunch crossing identification (BCID) 2. LVL2 uses Regions of Interest (identified by LVL1) data (ca. 2%) with full granularity from all detectors 3. Event Filter has access to full event and can perform more refined event reconstruction

4 Level1 Muon Trigger System 4/23 TGC provides Bunch ID muon hit position Pt of muon EC toroidal magnet 2 station coinc. low Pt trigger (>6GeV) 3 station coinc. high Pt trigger (>20GeV) Barrel Troidal Magnet Endcap Troidal Magnet

5 Thin Gap Chamber Performance requirements 1 Detection efficiency > 99% Trigger 2 Signal response time ~ 25nsec BC ID 3 Stable operation for more than 10 years under high rate environment (~khz/cm 2 ) 4 Radiation Tolerance (~0.6C/cm) Structure of TGC Similar to MWPC Wire : 50μm gold-plated W Anode-Cathode Gap : 1.4mm Wire-Wire Gap : 1.8mm 2-dimentional readout (wire, strip) Cathode plane: carbon (~MΩ/cm 2 ) Trapezoidal shape (~2m 2 ) Operation condition Gas : CO 2 + n-pentane (55:45) High Voltage : +3.0kV Operation Mode : Limited Proportional Gas Gain : ~10 6 5/23

6 Mass production of chambers Total:3,600 chambers (11 types) Production of TGC Produced in Japan, Israel and China. Total channel:~ 320,000 channels Covered area:~ 2,700m 2 Japanese contribution Total : 3 types, 1,224 chambers (inc. spare) Period : Apr. 2001~Feb (48 months) Site : KEK (Fuji experimental hall) Carbon painting 6/23 Wire winding Close chamber

7 Inspection of TGC 7/23 Chamber performance test in Japan Test Stand at Kobe University Period: May 2001 ~ July 2005 (40 months) Check following items using cosmic ray Detection efficiency (5mm x 5mm) Timing distribution Result for Japanese chambers 12 chambers with locally inefficient region. Not transported to CERN Transportation from Kobe to CERN by ship All good chambers were already transport to CERN

8 Diagram of TGC Electronics 8/23 TGC1 TGC2 TGC3 ASD ASD On TGC chambers PS-Board PP delay BCID PP delay BCID Doublets PP delay BCID PP delay BCID Triplet Service PP TTC signal fanout to PS-Boards SLB ASIC 3/4 Coin. Readout JRC DCS-PS SLB ASIC 2/3 Coin. Readout JRC DCS-PS CAN TTCrq Big Wheel edge Counting Room HSC(VME) crate H-Pt wire H-Pt strip SSW HSC DCS LCS VME64 crates Trigger crate Sector Logic Readout crate ROD Control crate CCI TTCvi Trigger MUCTPI Readout ROB Control TTC CTP TTC: Timing Trigger Control DCS: Detector Control System

9 TGC Electronics Modules made in Japan TGC1 TGC2 TGC3 ASD On TGC chambers PS-Board on TGC chambers PP delay BCID PP delay BCID Doublets SLB ASIC 3/4 Coin. Readout JRC DCS-PS Big Wheel edge HSC(VME) (Big Wheel edge) H-Pt wire H-Pt strip Counting Room VME64 crates Trigger crate Sector Logic Readout crate H-Pt 9/23 ASD ASD PP delay BCID PP delay BCID Triplet ASD card Service PP TTC signal fanout to PS-Boards SLB ASIC 2/3 Coin. Readout SSW Board JRC DCS-PS CAN TTCrq PP SSW SLB HSC DCS LCS ROD Control crate CCI TTCvi PS Board H-Pt Board HSC Board TTC: Timing Trigger Control DCS: Detector Control System

10 Assembly and Installation of TGC

11 TGC consists of three wheels Assembly unit We call this Big Wheels (BW) Triplet (TGC1) middle doublet (TGC2) pivot doublet (TGC3) located at each end-cap (A-side and C-side) Each BW consists of 12 sectors TGC1: 18 triplet modules/sector TGC2,3: 22 doublet modules/sector 1488 modules in total. 11/23 25m

12 Two Working CERN 12/23 Sector assembly site ATLAS pit Storage of 1/12 sector

13 Sector Assembly Procedure 13/23 1. Chamber preparation before installation Check gas tightness of chamber 2. Assembly in horizontal position Assembly of Al frame for sector Arrangement of cables (signal and LV/HV) Arrangement of gas pipe 1 2

14 Sector Assembly Procedure (cont) 3. Assembly in vertical position Chamber installation 4. Install on-detector electronics 5. Test of sector Check cabling and electronics health Send test pulse to ASD card Apply high voltage to chambers with CO 2 gas flow Test with RI source & cosmic ray 14/ SSW, HSC boards PS Boards

15 Test Result We have checked cabling before installation 12 x TGC1 sectors and 12 x TGC2 ones were tested. TGC3 is tested now. Have found some problems and fixed them. insufficient connection cable swapping broken cables electronics failure dead channels on chamber Delay scan method To confirm timing adjustment functionality Take data with changing test pulse delay values with accuracy of sub-nano second # of hit channel per event 15/23 In TGC1 test, all electronics channels (~30k channels) were checked. Only five channels on chambers were found to be dead (0.017%). 16 Current bunch Previous bunch Delay scan Next bunch Test pulse delay value(ns)

16 Progress of sector assembly 16/23 Assembly work is performed in parallel on 2 sites at assembly site. We have already tested 12 x M1-C sectors and 12 x M2-C ones. Now we are assembling M3-C 4 sectors were already installed. M1-A will be assembled from this November using 3rd site. 1 sector/week

17 Installation to ATLAS pit 17/23 Transport to the pit Lower down to the pit Schedule station Assembly Installation C-side TGC1 TGC2 TGC3 Done Done In progress Done Jan.07 - Feb.07 - A-side Nov.06 - Jan.07 - Built up to a BW

18 Current pit 18/23 Assembly and installation of C-side TGC is in progress 1st BW has been fully installed in the pit 2nd BW is ready for installation Stocked in assembly site Services to be performed in the pit Check distortion of BW Check electronics and DCS Gas, LV/HV and optical fiber Installation of A-side TGC will be started from Jan. 07

19 Future test programs foreseen in the pit

20 Preparation for the beam collision Timing adjustment TGC must make level1 trigger decision at each 40MHz bunch. Strategy 1. Before beam collision Timing adjustment is synchronized to 40MHz clock 2. After beam collision Adjust phase between bunch crossing timing and L1A signal. Pre-run Cosmic run Single beam halo run provide trigger signal need special configuration (1 station coincidence) 20/23 Cosmic ray Beam halo

21 Summary & Plan 21/23 Thin Gap Chamber Used as ATLAS Level1 endcap muon trigger chamber Almost chambers were produced and tested their performance. Assembly and Installation TGC modules are assembled to 1/12 sectors. TGC1 and TGC2 for side-c have been assembled. TGC3 are assembled now. TGC1 for side-a will start to be assembled from this November. The first Big Wheel station (TGC1) was installed on this September. TGC2 will be installed in Jan. 07. Sector Test To check on-detector electronics and cablings. TGC1 and TGC2 for side-c have been checked. We continue sector tests for remaining sectors in cooperation with sector assembly. station Assembly Installation Future Plan We will start full big wheels test TGC1 Done Done from Mar.07 C-side TGC2 Done Jan.07 - Timing adjustment TGC3 In progress Feb.07 - Cosmic & beam halo run A-side Nov.06 - Jan.07 -

22 Backup slide

23 Result for RI source & cosmic ray test 23/23 RI source test 1MBq 60 CO was used. CO 2 flow, 2.8kV? Only very few hot channel was found. Cosmic ray test Random trigger 100kHz clock

24 Before beam collision 24/23 BC delayed test pulse TGC hit PP in SLB in TOF cable delay signal delay BC TOF Confirm signal delays TGC hit PP in SLB in cable delay' signal delay' delayed test pulse' Procedure 1. Set test pulse delays properly. 2. Confirm necessary signal delay values by checking test pulse data timing adjustment is synchronized to 40MHz clock signal delay PP test pulse delay SLB ASIC 3/4 Coin. Readout TTC JRC

25 After beam collision 25/23 Bunch crossing adjust phase 40MHz TTC clock signal delay Procedure 1. Take data with changing TTC clock skew. 2. Confirm signal delays with synchronized to beam collision by checking data. PP clock SLB ASIC 3/4 Coin. Readout TTC JRC

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