GEM Design Plans Jason Gilmore TAMU Workshop 1 Oct 2013 1.

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Presentation transcript:

GEM Design Plans Jason Gilmore TAMU Workshop 1 Oct

The CMS GEM project : Global Requirements on Electronics 2 GEM detectors Triggering Tracking Provide full granularity tracking data on receipt of a L1A – Full resolution not available before L1A ? Be compatible with CMS trigger upgrade possibilities – LV1A latency < 20us – LV1A rate < 1MHz Poisson Provide Trigger & Tracking data from all GE1/1 GEM Chambers Provide “Fast OR” trigger information with granularity of 2 or 4 channels to send locally to CSC TMB. Timing resolution <8ns. Design optimized for GEM detectors – Use CERN common Projects where possible (GBTs & Versatile Link)

GEM Front-End Electronics Geometry GEMs are logically divided by columns in phi and partitions in eta – Each region is 128 strips wide – Read out with a VFAT3 chip 3 3 columns 6, 8, 10 partitions VFAT3 chips GEM hit location encoding: Column (2 bits) Partition (3-4 bits) Trigger Pad ID (5-6 bits) Total: bits (most likely 10 bits) GEM data to OTMB over 2 fiber links: 96 bits/BX using DCFEB fiber protocol Encode up to 9 GEM pad hits Negligible probability to have more than 9 hits in a GEM chamber

VFAT3 Front-End Chip Separated Trigger & Tacking (STT) 4 Fixed Latency trigger path: “S” bits Tracking path, After L1A This is the favorite architecture for CMS

Trig Unit 5 Synchronous to LHC Bx, Reduced granularity to 2 or 4 strips Example 1: (1 bit per 2 channels) Trigger granularity = 2 strips, Frequency = 320Mbps send 64 bits per Bx 7/8 bit encoding ? 10 slvds O/Ps = 70 bits / bx 1 bit for clock tick (sync) 5 bits spare (Example 1.2): (1 bit per 4 channels) Trigger granularity = 4 strips, Frequency = 320Mbps send 32 bits per Bx 7/8 bit encoding ? 5 slvds O/Ps = 35 bits / bx 1 bit for clock tick (sync) 2 bits spare Both require Data Concentrator ASIC or FPGA to : Gather Trigger signals from 24 VFAT3s Encode addresses of hits to include chip location Transmit to dedicated trigger GBT or optical Tx Example 2: Encode (7 bits) + next ch Trigger granularity = 1 strip, Max 8 hit channel addresses + neighbor Frequency = 320Mbps No 7/8 bit encoding 8 slvds O/Ps = 80 bits / bx 1 slvds O/P for clock sync Example 2.2: Encode (6 bits) + next ch Trigger granularity = 2 strips, Max 8 hit channel addresses + neighbor Frequency = 320Mbps 7/8 bit encoding 8 slvds O/Ps = 80 bits / bx 1 slvds O/P for clock sync Channel address hit Neighbor hit 1 bit per hit 1) 2) (Can incur losses) (lossless)

Separated Trigger & Tracking Plan [Fixed Latency Trigger ASIC (FPGA)] 6 Trig data (encoded S-bits) TMB uTCA Concentrator & Encoding: FPGA 320Mbps “S” 320Mbps Bandwidth = 3.2Gbps 24 VFAT3 (STTP version) TRIGGER PATH Fixed Latency Trigger If granularity = 2 strips > 1536 addresses (11 bit address) If granularity = 4 strips > 768 addresses (10 bit address) Aim : Keep complexity of concentrator chip low GBT Data PATH Full granularity (non zero suppressed) 1GBT for 8 VFATs VFAT3 STT

CMS GEM Electronics Overview 7 GBT readout Direct e-link communication between front-ends and GBT No Separate path for trigger. Trigger path to external systems at uTCA level. Optical path to uTCA relies n GBT ASIC development

CMS GEM Electronics System Development 8 VFAT3 under design Hybrid development underway GEM_PCB (CERN) Development underway Opto hybrid (ULB): Hardware design started Using CERN common Projects (GBTs & Versatile Link) & collaboration with TAMU & TAMUQ GLIBs Common CERN development AMC13 from Boston Uni. uTCA CMS standard for upgrades Development (ULB) Interface to CMS CAEN power supplies Initial prototype : Using VFAT2 + Opto hybrid (without GBT) + uTCA Final prototype : VFAT3 + Opto hybrid with GBT + uTCA ……. Under development ……. Foreseen for 2016

Prototype Development Plan 9 30x30 Full size prototype To evaluate GEB (GEM Electronic Board), VFAT hybrid, cooling mechanics. VFAT2 Erni to Erni Turbo VFAT2 Opto hybrid uTCA VFAT2 Opto hybrid VFAT3 Opto hybrid 2 VFAT3 + Final Optohybrid with FPGA + GBT uTCA TM B uTCA TM B uTCA TM B Optional step : Small uTCA setup, allows opto hybrid, uTCA and DAQ software development Full size setup, allows opto hybrid, uTCA, DAQ software and link to CSC TMB Optional step : If GBT project is delayed Final setup with VFAT3 and GBT VFAT2uTCA ULB: Software communication to VFAT2 through uTCA 3 rd q 14 3 rd q 15 2 nd q 13 3 rd q 13 4 th q 13 3 rd q 15