RP220 Trigger update & issues after the new baseline
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1 RP220 Trigger update & issues after the new baseline By P. Le Dû Cracow - P. Le Dû 1
2 New layout features Consequence of the meeting with RP420 in Paris last September Add 2 vertical detection system in the RP for elastic scattering Alignment and calibration (10 4 events per 10 σ) Multiply the number of position planes by 3 Use 3D pixel detector (from RP420) Trigger plan read out using strip mode with fast read out. Si Trips with ABCD read out becomes a back up solution Separate the position and timing detectors Easier implementation : Cooling ) Position : Pixel 3D planes in the Roman Pot Time : Movable Beam Pipe ( from RP420) with GasTOF (15 psec the early stage) and MCP (5 psec resolution in a second step) Cracow - P. Le Dû 2
3 MCP-PMT New Layout U Y V 8 x 8 Pixels Light Guide Radiator 3D pixels 3 time more channels MCP GASTOF S I D E U P D O W N Timing detectors Movable Beam Pipe Roman Pot B Roman Pot A 2 x 21 planes of 3D pixels Cracow - P. Le Dû 3
4 RP220 only PLtrack Trigger topologies JET 1 PL. AND PR track with ζ cut Et JET 1 AND 2 > 40 Gev JET Rapidity correlation? Dijet ENERGY /TOTAL > 0,9 RP JET 2 RP 220 PR track RP220 + FP420 PL Track JET 1 PL track with ζ cut Et JET 1 AND 2 > 40 Gev JET 1 Rapidity Cut Dijet ENERGY /TOTAL > 0,9 1,6 KHz RP 220 JET 2 FP420 Cracow - P. Le Dû 4
5 Horizontal roman pots (a la TOTEM) m xa m xb Diffractive Trigger jet 5 plans Si strips /Roman Pot σ position 5 microns σ time < 10 psec PA SH Front end Pipeline buffer (6.4 µsec) xa xb T Left Pretrigger xa - xb = ns (air cable) jet ATLAS detector LR Trigger Logic LP AND RP TR - TL L1 CTP Right Pretrigger 2 Jets with Pt > 40 Gev/c Max 75KHz xd - xc =0 T T R +730 ns 1,0 µsec 2,0 µsec 2,5µsec 30 nov 2006 R O D ATLAS standard HLT Trigger (ROB) Refined Jet Pt cut Vertice within millimeter Δ time < 5 to 10 psec Cracow - P. Le Dû ATLAS Standard 5 US15
6 Timing and Data flow Bing RP 0 ns Flight path Pretrigger Data 220 m(alcove) 733 ns Detector response 11 ns ABCD response 150 ns 20 ms cable 80 ns Pretrigger Processing 50 ns Processing RP Triigger ATLAS CTP 1024 ns RP ASIC & FPGA SI ---> 4 Events x 2 Si Strips x 10 bit words MCP ---> 4 Events x 6 bit words per ing = 104 bit/bx Average Rate = 4,16 Gbit/sec (11ns through cable to Alcove) ALCOVE µcta crate PRETRIGGER Matching 2RPs with overlap Si Strips Add Timing information from relevant MCP PMT pixel (1 mm 2) ) Cable 1921 ns 80 bit/b x 40 MHz = 3,2 Gb/s GB/s transfert time LVL1 ACCEPT (75 KHz) Processing RPs ROD Data Production per Roman Pot to ROD 4 events x(7 Si detectors x10 bit word stored in the pipeline) 4 events x 1 MCP-PMT detector x (6 bit adress + 8 bit fine timing) Total per LV1 Accet = 336 bit Total x 75 KHz =25 Mb/s Max 2500 ns Cable 588 ns 5120ns 2x 1100 ns K 4x 5 Gb/s= 2620 ns Cracow - P. Le Dû 6
7 Implementation block diagram MBP RP B RP A // IP Detector ASIC Picosecond CLK 160 MHz Trigger DATA 4,16 Gb/s RO DATA 670 kb/s Local Logic 20 m Cables FPGA FPGA FPGA RP Left Trigger 1Cable L1 ACCEPT ATLAS LVL1 CTP RP Right Trigger 2 x 3,2 Gb/s DATA 4 fiberss ATLAS ROD (LVL2 LHC & CLK DAQ) µcta crate 75 KHz Shielded Alcove Pretrigger logic Read Out Control & Monitoring 25 Mb/s 160 MHz CLK (fiber) Reference clock (Atomic) LHC CLK US 15 Cracow - P. Le Dû 7
8 Multi Chanel Plate PMT Operation photon Faceplate Photocathode Dual MCP Photoelectron ΔV ~ 200V ΔV ~ 2000V MCP-OUT Pulse Gain ~ 10 6 ΔV ~ 200V Anode Cracow - P. Le Dû 8
9 Major advances for TOF measurements in HEP Burle- Photonis MCP 2 x 2 sensitive area Development of MCP s with 6-10 micron pore diameters Ability to simulate electronics and systems to predict design performance Oscillator with predicted jitters << 100 femtosec Use Cherenkov light for incoming rel particle Custom Anode with Equal Time Transmission Lines + Capacitative return Two cards 2 x 2 connected to the MCP anode planes (8x8 pads) Picosecond card with picosecond Time stretcher SiGe chip includes: Discriminator 2 GHz PLL Time stretcher FPGA card includes 200ps TDC Control, calibration, interface Cracow - P. Le Dû 10 µm pores 860 fs 20 Pe IBM 8 HP Chip 9
10 Generating the signal Incoming rel. particle Use Cherenkov light fast Custom Anode with Equal Time Transmission Lines + Capacitative. Return Collect charge here differential Input to 200 GHz TDC chip A 2 x 2 MCP actual thickness ~3/4 e.g. Burle (Photonis) with mods Cracow - P. Le Dû 10
11 Equal Time Anode structure RF Transmission Lines Summing smaller anode pads into 1by 1 readout pixels An equal time sum make transmission lines equal propagation times Work on leading edge ringing not a problem for this fine segmentation Cracow - P. Le Dû 11
12 Synoptic of the MCP UC Read Out/DAQ chain Objective : 1 psec M C P DAQ Chip Fukung Tanget al. 200 MHz TDC (FPGA) Cracow - P. Le Dû 12
13 New MCP - PMT development Collaboration between U. Chicago (Henry Frisch et al.) Argonne FNAL Saclay Burle-Photonis Memorandum Of Undestanding to be signed next week Our needs 5 psec resolution ( instead of 1psec) Make the read out more easier --> fully digital 1 x 1 inch 2 instead of 2 x 2 8 x 8 64 outputs pixels of 3x3 mm 2 Cracow - P. Le Dû 13
14 ASIC MCP-PMT 8 x 8 Pixels MCP PMT implementation issues? Light Guide? Radiator Need to optimize (MC) Radiator thickness Nb of Photo electron Light guide angle Simulations by Tim Credo (UC) Cracow - P. Le Dû 14
15 Best results with 2 TOF counters in tandem From J. Va vra Cracow - P. Le Dû 15
16 Issues and workplan Common to RP420 (Join( effort) 3D pixel standard planes GasTOF and movable beampipe L2 Specific to RP220 (need( to find a better acronym) 3D large size detectors ( 2,5 x 2,5 cm 2 ) 3D Strips trigger planes fast read out MCP-PMT optimization and integration in movable beampipe --> MC simulation L1 Backgrounds produced in detectors Need for sweeping the low Pt particles? Cracow - P. Le Dû 16
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