# Presentation: 297459

## Silicon Vertex Trigger (SVT) Upgrade

**J. Adelman, I. Furic, Y.K. Kim, M. Shochet, U.K. Yang****  ****(Chicago)**
**T. Liu****  ****(Fermilab)**
**I. Roffilli, L. Sartori, F. Schifano, R. Tripiccione****  ****(Ferrara)**
**A. Cerri****  ****(LBNL)**
**A. Bardi, F. Bedeschi, R. Carosi, S. Galeotti, P. Giannetti, M. Piendibene, L. Ristori,**** ****F. Spinella****  ****(INFN Pisa)**
**G. Punzi****  ****(Scuola Normale Superiore, Pisa)**
**A. Annovi, M. Bitossi, M. Dell’Orso, S. Donati, P. Giovacchini****  ****(Pisa)**
**M. Rescigno, L. Zanello****  ****(Rome)**
**P. Catastini, A. Ciocci, S. Torre****  ****(Siena)**
**T. Maruyama****  ****(Tsukuba)**
**J. Bellinger, D. Carlsmith, W. Chung, C.M. Ginsburg, R. Handler, G. Ott, L.G. Pondrom****   ****(Wisconsin)**
**M. Shochet**

- Director's Review - SVT Upgrade

- 7/20/04

## Why SVT?

**1****st**** time at hadron collider:  **
**	****	****Trigger ****(********20 ********sec)**** on *****b***** quarks based on lifetime.**
**Important for both high-P****T**** and *****B***** physics.  ****(3****rd**** generation)**
**Attach to drift chamber tracks hits from silicon detector.**
**Impact parameter resolution        beam diameter.**

**impact parameter (cm)**

****** ****= 50 ********m**

**1****st**** CDF Run II paper: *****D******s******-D******+*****  ********M**

- Director's Review - SVT Upgrade

- 7/20/04

## The Existing SVT

**12 azimuthal wedges:**
**Hit Finder:  ****find silicon cluster centroids**
**Merger:  ****silicon clusters + drift chamber tracks**
**Associative Memory:  ****fast pattern recognition ****(32K patterns, “roads”/wedge)**
**	****	****	****         ****uses coarser resolution ****(“superstrips” ********500********m)**
**Hit Buffer:  ****stores hits at full resolution; retrieves those within a road**
**Road Warrior:  ****remove roads with the same hits ****(important in 4/5 mode)**
**Track Fitter:  ****fits track candidates with a linear approximation**
**Ghost Buster:  ****keeps the best track associated with each drift chamber track**

- Director's Review - SVT Upgrade

- 7/20/04

## Impact of SVT on the physics program

**High P****T**** physics:**
**Broad searches for new physics**
**High P****T**** *****b*****-jet**
**Missing E****T**** + *****b*****-jet**
****** ****+ *****b*****-jet**
**Higgs search**
**Higgs multi-jet trigger**
**Top (and Higgs) mass**
**                        ****(with SVT trigger, 95%       ; without SVT, <1%) **
**B physics**
**All-hadronic final states ****(*****B******s***** mixing, ********, ...)**
**Multiple displaced tracks**
**Semi-leptonic tag**
**Lepton + displaced track**

- Director's Review - SVT Upgrade

- 7/20/04

**Why Upgrade SVT?**

**A critical issue for the trigger is deadtime.  **
**At current luminosities ****( < 10****32****)****, both high-P****T**** and *****B*****- physics level-1 triggers have to be prescaled because of SVT execution time.**
**At Run IIb luminosity, the level-1 rates become really big:**
**2-track *****B***** trigger:****	****	****  49 KHz  @ 1.5x10****32**
***Z************bb***** trigger:****	****	****  26 KHz  @ 3x10****32**
**There are many improvements under way for Run IIb.**
**L2 decision time**
**Detector ******** L3 transfer rate**
**L3 ******** Feynman Center transfer time**
**Physics program limitation in Run IIb: ****SVT execution time**

- Director's Review - SVT Upgrade

- 7/20/04

## Preserving CDF Triggering Capability

**Maintaining muon trigger acceptance in 1.0<|********|<1.5.**
**XFT may require outer superlayer in Run IIb**
****** ****trigger efficiency drops by ******** 50%**
**Using muon stubs as SVT seeds can restore the performance.**
**Insurance against further COT degradation.**
**larger XFT fake rate ******** more track candidates**
** ****worse pointing resolution ******** need for more patterns**

- Director's Review - SVT Upgrade

- 7/20/04

## What to do about it

**Reduce SVT execution time.**
**As luminosity ********, SVX hit density ******** ****(more with 396 nsec bunch spacing)**
****** ****more hits to process**
**but more importantly**
**more track candidates to fit because of the number of hits in a road**
**Reduce the road combinatorics by using narrower roads.**
****** ****Increase the number of roads.**
**Reduce the fit execution time.**
****** ****Build a faster Track Fitter.**

- Director's Review - SVT Upgrade

- 7/20/04

## How much improvement can we get?

**Model SVT timing:**
**where *****a***** and *****b***** ****as well as *****N*****hits**** ****and *****N*****comb**** vs ********* *****are determined from data.**

- Director's Review - SVT Upgrade

- 7/20/04

## Extrapolate to high  with & without upgrades

**measured [f(>50********s) = 17.7%]**

**predicted [f(>50********s) = 16.6%]**

**predicted [f(>50********s) = 56.6%]**

**predicted [f(>50********s) = 0.8%]**

**predicted [f(>50********s) = 6.6%]**

- Director's Review - SVT Upgrade

- 7/20/04

## What we could gain (after other trigger/DAQ upgrades)

**5% deadtime**

| Current SVT | Upgraded SVT |
| --- | --- |
| 13 KHz | 23 KHz |

**Maximum L1 SVT-trigger rates for 5% L2 deadtime @ 3x10****32**

- Director's Review - SVT Upgrade

- 7/20/04

## Specifically what will we do?

**Build a minimum of new hardware.**
**	****Use LHC design + new CDF Pulsar boards.**
**New Associative Memory ****(more roads)**
**Prototypes being constructed/tested ****(based on LHC design)**
**Sequencer firmware to be added to existing Road Warrior Pulsars.**
**New Hit Buffer ****(handle larger # of roads & faster)**
**Pulsar board with memory on mezzanine**
**New Track Fitter ****(handle larger # of roads & faster)**
**Pulsar board with memory on mezzanines**
****** ****Build Pulsar mezzanine cards.**
**	****     ****Write Pulsar firmware based on existing functionality.**
**	****     ****Upgrade online and offline software for new hardware.**

- Director's Review - SVT Upgrade

- 7/20/04

## The Upgraded SVT

- Director's Review - SVT Upgrade

- 7/20/04

## New AM++  (fully funded by INFN)

**Track finding for all patterns simultaneously at high rate.**
**AM chip:  ****standard cell chip;  prototype in production**
**LAMB:****  prototype ready for testing with FPGA**
**AM++:  ****prototype testing begins next month**

- Director's Review - SVT Upgrade

- 7/20/04

## AM Sequencer + Road Warrior

**Pulsar board with firmware to be sequencer for AM system.**
**Road Warrior function done before Hit Buffer.   ****(speed)**
**Need simple mezzanine card with memory.**

- Director's Review - SVT Upgrade

- 7/20/04

## Hit Buffer

**Hits stored with full resolution by superstrip.**
**Roads sent by AMS/RW are sent out with raw hits attached.**
**Pulsar board with HB firmware + mezzanines with memory.**

- Director's Review - SVT Upgrade

- 7/20/04

## Track Fitter

**Receives a road and forms track candidates ****(combinations)****.**
**Calculates *****d*****, *****c*****, ********, ****and fit ********2**** using a linear approximation.**
**Transmits tracks that pass a ********2**** cut.**
**Port existing Track Fitter firmware; build mezzanines.**

- Director's Review - SVT Upgrade

- 7/20/04

## Software

**Existing online and offline software has to be modified for the new hardware.**
**board simulation**
**creating roads and fitting constants**
**online diagnostics**
**online operating code (initialization)**
**readout code**
**offline tools**
**infrastructure, e.g. database code**

- Director's Review - SVT Upgrade

- 7/20/04

## Commissioning

**Test stands exist at Fermilab, Pisa, and Chicago.**
**First test boards at full speed in test stand with other Pulsars as transmitters and receivers.**
**Test with CDF data without impacting normal data taking.**
**Existing SVT fanout boards can send data to new board with output compared to expectation.**
**When Track Fitter is ready, it can be installed immediately to get speed advantage.**
**When AM system, Hit Buffer, and Track Fitter are ready, they can all be installed.**

- Director's Review - SVT Upgrade

- 7/20/04

## US Cost  (unburdened)

**Spares included**
**Pulsar & transition cards identical to those built in the past few months**
**Mezzanine cards based on recently built boards and price of chosen memory chip**
**Pulsar boards****	****	****28x$4.1K****	****	****	****$115K**
**Mezzanine cards****	****	****total of 72 ****	****	****	****    28K**
**HB transition cards  ****	****14 ****	****	****	****	****      ****4K**
**Cables & connectors****	****	****	****	****	****      1K**
**Mezzanine engineering****	****	****	****	****	****    39K**
**Firmware engineering****	****	****	****	****	**_**    53K**_
**	****	****	****	****	****	****	****Total****	****	****$240K**

- Director's Review - SVT Upgrade

- 7/20/04

## Personnel

**We have a large group of physicists working on SVT.**
**No person is responsible for more than 1 item.**
**Project management:  ****M. Shochet, A. Annovi**
**Coordination in Italy:  ****P. Giannetti**
**AM++:  ****A. Bardi, L. Tripiccione, A. Annovi, P. Giovacchini, I. Ruffilli**
**AMS/RW:****  F. Spinella, M. Piendibene**
**Hit Buffer:  ****I. Furic, T. Maruyama, T. Mansikkala (eng.)**
**Track Fitter:  ****J. Adelman, U. Yang**
**Mezzanine:  ****F. Tang (eng.), [M. Shochet]**
**Software:  ****Wisconsin group, M. Rescigno, A. Cerri, S. Donati, R. Carosi**

- Director's Review - SVT Upgrade

- 7/20/04

## Schedule Milestones

**( Pulsar boards will be ordered by October, 2004)**
**AM++****	****    ****	****begin production****	****	****	****         ****01/05**
**AMS/RW****	****	****firmware complete, full testing begins    ****05/05**
**Hit Buffer****	****	****firmware complete, full testing begins    ****04/05**
**Track Fitter****	****firmware complete, full testing begins    ****04/05**
**Mezzanine cards****	****begin production****	****	****	****        ****11/04**
**SVT Upgrade ready for installation****	****	****	****        ****06/05**** ****	**

- Director's Review - SVT Upgrade

- 7/20/04

## Specifications Notes

**AM++ chip****	****	****	****final version exists**
**AM++ VME board****	****	****final version exists**
**AM++ mezzanine card****	****	****final version exists**
**AM mini-backplane board****	****	****final version exists**
**common Pulsar mezzanine****	****	****draft exists; final by 8/15/04**
**AMS/RW I/O and firmware****	****final version exists**
**Hit Buffer I/O and firmware****	****final version exists**
**Track Fitter I/O and firmware****	****draft exists; final by 8/31/04**
**Software additions****	****	****task list exists**

- Director's Review - SVT Upgrade

- 7/20/04

## Conclusion

**The SVT upgrade is important to the CDF Run II physics program.**
**We have a design and a team that can complete the job on schedule.**
**A significant fraction of the hardware is just copies of existing boards.  Most of the rest is already in the prototype stage.**

- Director's Review - SVT Upgrade

- 7/20/04