L1Cal Installation Overview

updated: 05-May-04

Index

  1. Goals & Constraints
  2. Elements of Installation
  3. Schedule

Goals

Perturb DØ data taking as little as possible. This will require the following to be accomplished quickly and efficiently.
  1. physical installation of the L1Cal hardware in MCH1
  2. verification that all system hardware is working
  3. integration of the Run IIb L1Cal into the DØ readout
  4. well understood triggers

Constraints

Finding people to do all the tasks required to prepare, install and commission the system will be the most important hurdle to overcome. The plans below are designed with this in mind. They aim to:
  1. Identify the minimum set of tasks that must be done. Particularly before the real installation, we will not be able to do all the tests we would like. We need to ensure that important items are not neglected by concentrating on more trivial one.
  2. Identify groups/people to do these tasks or point out areas where there are holes.

Elements in the Run IIb L1Cal Installation

Custom Electronics:

It is the responsibility of each institution building a piece of electronics to bench-test all their cards at their home institution. Each institution will also provide help to integrate their prototype, pre-production and final cards into the system at Fermilab.

Test System at Fermilab:

We will populate all the L1Cal crates and racks with electronics as they become available in a special Test Area on the sidewalk outside of MCH1. This Test Area will also be used to do integration tests and data acquisition during the prototyping and pre-production phases of the hardware. It is foreseen that this system will run almost continuously starting in the Fall of 2004. Overseeing this system is currently the responsibility of the UIC group, however, all other groups will participate in its operation and do tests on their boards as required.

Data Sources for Test System:

Cards in the test system will use inputs from the following sources:
  1. Test memories on the ADFs, TABs and GAB
  2. The Test Waveform Generator being built by Fermilab
  3. Splitter used to split data from BLS cables at the CTFE cards

Integration Tests:

See also Hal's talk at the 08-Apr-04 meeting. These are a continuing series of tests at the Fermilab Test Area to ensure that all elements of the system communicate successfully with each other and with the DØ Trigger Framework and Online system. The general goals of the tests are:
  1. Test all data paths in the system under realistic running conditions for long periods of time. Nearly all data paths in the system have now been checked at some level with prototype boards, but more rigorous testing will need to continue.
  2. Acquire data from the current L1Cal system for trigger studies using the Splitters.
  3. Achieve a stably running system using TFW timing.
  4. Test out downloading, monitoring and calibration schemes before actual data taking.
  5. Do final hardware verification of all boards in the system.

Trigger Verification

See also Hal's talk at the 08-Apr-04 meeting. The goal here is to have well-understood trigger terms (with accurate rate and efficiency estimates) in place before installation. Some steps to this goal are:
  1. Collect lots of splitter data for various L1Cal channels
  2. Make sure the simulation is usable and an accurate reflection of the hardware
  3. Tune the simulation of TT Et's to the splitter data
  4. Make sure that simulated rate estimates agree with Run IIa data
  5. Study optimal digital filtering and noise issues using the splitter data.
  6. Construct a first pass of digital filter coefficients
  7. Study the TAB algorithms (sliding windows, etc.) using simulation.
  8. Determine optimal trigger terms using simulation

Physical Installation

Since the entire L1Cal system will be assembled and checked out prior to installation, this step will consist of:
  1. Dismantling and removing the Run IIa L1Cal
  2. Winching the populated racks into MCH1
  3. Cabling the new system

Technical Commissioning

In this step the Run IIb L1Cal hardware is checked out after it is installed in the MCH. Since all individual boards will have been tested in the Test Area prior to installation, this will mainly be an issue of verifying that cabling is correct.

Physics Commissioning

This constitutes the studies with data that will be necessary before we can declare that DØ is ready to use the Run IIb L1Cal. Previous work with the following is designed to minimize the time that this step will take.
  1. Monitoring and calibration experience in the Integration Tests.
  2. Studies of noise, etc. using splitter data.
  3. Trigger terms previously defined and studied leading to rate and efficiency estimates.

Operations and Long-Term Maintenance

Most Run IIb L1Cal groups are signed on for the long haul - but this needs to be assured. We also need to make sure that the Physics Groups are involved in this process.

Tentative Schedule

There is a full Microsoft Project version of the installation schedule. This is an attempt to summarize it, including some of the pre-installation elements.

Task Start Duration
Installation Phase
Prototype Integration Tests now to fall 04
New Round of Simulation Studies May 04 to install.
ADF v.2 Available Oct 04  
Long-term Integration Tests
Collect Splitter Data		 Oct 04 to install.
Develop Calibration & Testing Dec 04 to install.
System Infrastructure to Test Area Jan 05 to install.
Installation Phase [1]
Tevatron Shutdown
(sets start point for all following tasks)		 Jul 05 (?) 14 w (?)
Remove Old Racks   1 w
Redress Cables   2 w
Install Racks   0.2 w
Connect New Rack Services   1 w
Connect BLS & Intermediate Cables   1 w
Technical Commissioning   4 w

Notes:

  1. The installation schedule assumes 2 shifts per day. Total time ~doubles for single shifts.