# Presentation: 360197

## L2 CAL Status

***Vadim Rusu***

**For the magnificent L2CAL team**

## The goal

- Improve the L2 MET resolution so that we can run at lower MET at L2
- L1 only uses 8/10 bits
- No L2 calculation in the current system
- Change the jet clustering so that we can control the rates at high luminosity
- Current L2 clustering – pacman style

**MET+2 JETS**

**JET40**

- L2 CAL status

## The design

- Calorimeter

- 10-bits Energy/Tower

- 8-bits

- Global L2 Decision

- Muon/XTRP/L1/SVT/XCES

- Add new hardware to send the towers straight to the L2 PC
- Get new PC for better performance (about time anyway)
- Everything to be commissioned parasitically

- L2 CAL status

## The project

- An international mini-collaboration
- Fermilab
- Chicago
- Madrid
- Padova
- Penn
- Pisa
- Purdue

- Started – Oct 2006
- Completed - ASAP

- L2 CAL status

## The know-how

- Use PULSARs as receivers for the LVDS data from DIRAC
- Need to interface the 40 bit cables with the PULSAR
- Build Mezzanine card
- Serialize the data in Slink format
- Receive on PC through Slink-PCI boards

- 40-bit word/cable
- @ CDF_clk (132 ns)

- 6 slink
- outputs

- 6 slink
- outputs

- Slink merger
- Pulsars
- (8)

- Data transfer latency  on average within ~10 us

**32-bit @ 40 Mhz**

**80 MhZ**

**80 MhZ**

** ****80 MhZ**

**32-bit @ 40 MhZ**

- Clustering
- timing ~ 10 us

- 6 slink
- outputs

**80 MhZ**

- 96 LVDS cables

- 96 LVDS cables

- L2 CAL status

## The tool

- LVDS Connector

- Pulsar
- side

- 40

- 10bits x4 = 40 @ cdfclk (132ns)

- input data
- per cable

-  JTAG

- Pulsar
- front panel

- 160

- CMC Connectors to
- the pulsar

- L2 CAL mezzanine card

- L2 CAL status

## The tool

- Built at UC in record time
- Thanks Henry and e-shop
- Tested and commissioned revision 1.0 over the holidays
- Worked out of the box

- Ted makes good for
- the bet he lost.

- L2 CAL status

## The pieces

- Mezzanine design
- Laura
- Testing/Checkout
- Lucas, Miguel
- Firmware
- Marco, Laura
- FER code
- Massimo, Laura
- Simulation package
- Simone D., Gene F.
- Monitoring
- Giorgio + Simone P., Michael – Wojtek/Carla – consulting
- PC infrastructure and algo
- Gene + Kristian Hahn – consultant
- PC interface
- Anadi
- Preparing the celebrations (parties, happy hours, etc...)
- myself

- L2 CAL status

## The status

- Boards – arrive over the month of February
- Mezzanine, Slink, AUX (Henry – UC)
- Front panels and strain relief (Richard – UC)
- Pulsars (Paola – Pisa)
- Cables – 80% in hand
- Cable map (thanks JDL)
- Software – final testings
- Firmware – stage 1  ready to go

- L2 CAL status

## The plan 

- Start splitting the cables one DCAS crate at a time starting next week
- Have half the DCAS system split and parasitically running by the end of February
- March have all system running parasitically
- April – new trigger tables
- May – Project completed
- 10 bit MET resolution
- New Jet algorithm (cone based)

- L2 CAL status

## The future

- The L2 CAL trigger will be a very versatile system
- What the new L2CAL will provide:
- 10 bit MET at L2
- Better L2 jet position
- L2 jet closer to offline jets
- What else?
- Angular correlations (jets, MET)
- Track jet matching
- Dijet mass
- New paradigm: Your offline analysis code can be implemented in the trigger
- Use the L2 CAL simulation to do studies that will improve the trigger selection
- Already starting on this in the context of HTTF

- L2 CAL status

## THE END

- L2 CAL status