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FPIX Optical Fiber Requirements

FPIX Optical Fiber Requirements. Simon Kwan August 30, 2012. FPIX Fibers. FPIX has four half cylinders, two on each side of the IP Each half cylinder has three half-disks Each half-disk has 34 modules on the outer assembly and 22 modules on the inner assembly Total number of modules =672

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FPIX Optical Fiber Requirements

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  1. FPIX Optical Fiber Requirements Simon Kwan August 30, 2012 CMS Pixel Upgrade Workshop, Grindelwald

  2. FPIX Fibers • FPIX has four half cylinders, two on each side of the IP • Each half cylinder has three half-disks • Each half-disk has 34 modules on the outer assembly and 22 modules on the inner assembly • Total number of modules =672 • Initially, the plan was to readout two modules using the same fiber. So we will need 336 fibers • Because each fiber bundle has 12 fibers, we will need 7 readout bundles per half cylinder or 28 bundles in total • Reminder: current FPIX has 192 readout fibers or 16 bundles. Fibers for the 3rd installed but not used (96 fibers) • Then there are the control fibers (for the pixel DOH Tracker DOH) • Each half-disk has four port cards. Each port card has one pixel DOH (6 fibers). • Each half cylinder has one CCU board with two Tracker DOHs (12 fibers) • So total number of control fibers per half-cylinder=84 (72 for Pixel DOH and 12 for Tracker DOH) or 336 fibers for the whole FPIX • Current FPIX has 240 control fibers CMS Pixel Upgrade Workshop, Grindelwald

  3. Data Rate • Fluence (MHz/cm^2) • Disk 1 inner:  89.4 • Disk 1 outer:  33.3 • Disk 2 inner:  91.3 • Disk 2 outer:  34.2 • Disk 3 inner:  91.0 • Disk 3 outer:  34.5 • Link Rate (Mbps) (using Data keeper and 2 modules/fiber) • Disk 1 inner:  190 • Disk 1 outer:  99.4 • Disk 2 inner:  193 • Disk 2 outer:  101 • Disk 3 inner:  192 • Disk 3 outer:  101 Simulation done by Karl Ecklund/James Zabel for L=2e34 and 25 ns BCO These values are an average over all blades on the inner and outer disks.  As well, they correspond to a fluence and link rate roughly equivalent to layer 2 (which is at 7cm). Note that the same simulation for BPIX has a 10-15% less than what Hans-Christian showed.

  4. Latest result on Link Rates • At Luminosity of 2e34 and 50 ns bunch spacing • Numbers for the inner disk (using datakeeper; 2 modules/fiber)inner disk 1 346 Mbpsinner disk 2 354 Mbpsinner disk 3 354 Mbps • Numbers for 1:1 on the inner disk and 2:1 for the outer disk.inner disk 1 173 Mbps  flux = 95.9 MHz/cm2outer disk 1 163 Mbps  flux = 36.7 MHz/cm2inner disk 2 177 Mbps  flux = 98.7 MHz/cm2outer disk 2 166 Mbps  flux = 37.5 MHz/cm2inner disk 3 177 Mbps  flux = 98.5 MHz/cm2outer disk 3 166 Mbps  flux = 37.8 MHz/cm2 • numbers for 1:1 on the outer diskouter disk 1 81.5 Mbpsouter disk 2 82.8 Mbpsouter disk 3 83.1 MbpsAll numbers include the tbm header/trailer and roc header overhead.  All are at 100 kHz L1A rate. CMS Pixel Upgrade Workshop, Grindelwald

  5. Rate calculation & Implication • Rate calculation shows that at 50ns BCO and at 2e34, the inner modules will need its own fiber • As presented at the July Tracker week, this has big implications for FPIX. • Two types of modules • Modules on outer assembly will use TBM07 with output at 160MHZ. Two modules on the same blade will have data multiplexed at the Datakeeper and readout by one POH channel • Modules on inner assembly will use TBM08 with output at 400 MHz. No datakeeper is needed • Need more fibers and POHs. Instead of 336 channels/fibers (96 POHs), we will need 468 channels/fibers (144 POHs). And more FEDs. • Each port card will have three POHs mounted. At least two different versions of port card • One serving 5 outer blades and 2 inner blades with 5 Datakeepers • Other serving 4 outer blades and 3 inner blades with 4 Datakeepers CMS Pixel Upgrade Workshop, Grindelwald

  6. One module, One fiber • We consider 3 different scenarios • Option A: same as before; two modules/fiber • Option B: inner module has its own fiber, outer module will keep the same 2:1 • Option C: every module readout by its own fiber • Option A – problematic as shown in rate calculation • Option B: Two types of modules and port cards complicates the design and assembly • We would prefer uniformity across FPIX. Only Option A and C can satisfy this. This leads us to consider and propose each module to have its own fiber and POH channel. (Option C) • PROS: one type of module and port card, no Datakeeper, no TBM07 (FPIX version of TBM) • CONS: needs even more fibers, POHs, and FED CMS Pixel Upgrade Workshop, Grindelwald

  7. Note • In all options, number of port cards remain the same (4 per half disk) • Number of control fibers (pixel DOHs and Tracker DOH) stay the same • Also no change in power distribution, cooling etc CMS Pixel Upgrade Workshop, Grindelwald

  8. Summary • Our new proposal requires an increase x2 in output (signal) fibers from 336 to 672 (56 bundles) • In any event, according to the rate calculation, each inner module needs its own fiber. So compared to what was presented at the July meeting, the increase is from 468 to 672 • Number of control fibers remain the same: 336 • Issues: availability of fibers; cost (more FED, POH; no Datakeeper and TBM07); mechanical constraint (fit 4 POHs per port card) CMS Pixel Upgrade Workshop, Grindelwald

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