# Presentation: 078077

## 2006 Shutdown

- George Ginther
- University of Rochester
- 6 March 2006

## Run IIb Shutdown Activities

- Install and commission Layer 0 detector
- Replace current Level 1 Calorimeter trigger with L1Cal trigger upgrade
- Replace current DFEAs in Level 1 Central Track Trigger with DFEA2
- Complete cabling/commissioning of Level 1 Calorimeter Track Match trigger
- Complete modifications to Level 2 Silicon Track Trigger to accommodate Layer 0 inputs
- Complete hardware modifications to muon Proportional Drift Tube readout to accommodate latency shift
- Refine V15 trigger list for post shutdown running
- Complete platform testing of pre-production AFEII-t readout boards for the Central Fiber Tracker

## Some Additional Shutdown Activities

- Preparation for latency shift
- Routine subsystem maintenance and  improvements
- Individual channel recoveries
- Silicon Microstrip Tracker
- HDI recovery effort
- Install additional BLM to accommodate testing of BLM readout upgrade
- Central Fiber Tracker
- New SBC in crate 0x52
- Calorimeter
- Cable harness checks
- Noise studies
- Inter Cryostat Detector  preamp modifications (and some phototube replacements)
- Muon system
- Source calibrations, HV calibrations, cable improvements, modifications to VME power supplies to improve radiation resistance
- Level 1 Muon Trigger
- Improve power supplies
- Luminosity Monitoring
- Detector  maintenance

## Layer 0 Silicon

- Detector
- Additional layer of silicon detectors designed to fit inside the current Silicon Microstrip Tracker
- Mitigate tracking losses due to radiation damage and detector aging
- Provides more robust tracking and pattern recognition to accommodate higher instantaneous luminosities
- Improves impact parameter resolution
- 12288 channels
- Installation Overview
- Tight clearances (~ 1mm) and substantial work handling and surrounded by delicate components
- Requires detailed planning, numerous detector reconfigurations, and significant expertise, tooling and technique development and testing
- Compromises Tevatron vacuum
- Requires significant collision hall access
- Our estimate of installation duration originally determined Tevatron shutdown duration

## Closed Configuration

## Clam shells and muon shielding open on north end

## North EF open too

## South EF and EC open allowing access to the south gap (assuming CF is also open)

-  GAP

## Layer 0 Installation Milestones

| ID | TASK NAME | Actual | Current Forecast | Pre-Shutdown
Forecast | Milestones |
| --- | --- | --- | --- | --- | --- |
| 2 | Beginning of RunIIb Tevatron Shutdown | 2/23/06 |  | 2/27/06 | 2/27/06 |
| 28 | Detector Open, Ready for Access | 3/01/06 |  | 3/02/06 | 3/07/06 |
| 34 | RunIIa Be Beam Pipe Disconnected | 3/3/06 |  | 3/7/06 | 3/9/06 |
| 47 | H Disks Removed |  | 3/16/06 | 3/17/06 | 3/23/06 |
| 56 | RunIIa Be Beam Pipe Removed |  | 3/24/06 | 3/27/06 | 3/31/06 |
| 75 | Layer 0 Tooling and Mounts Ready |  | 4/7/06 | 4/10/06 | 4/17/06 |
| 79 | Layer 0 Installed |  | 4/11/06 | 4/12/06 | 4/19/06 |
| 91 | RunIIb Be Pipe Connected, Layer 0 Cabled |  | 4/25/06 | 4/26/06 | 5/03/06 |
| 94 | Inner H Disks Re-Installed |  | 5/1/06 | 5/2/06 | 5/9/06 |
| 99 | Silicon Cold and Ready for Technical Commissioning |  | 5/4/06 | 5/5/06 | 5/12/06 |
| 103 | Complete Technical Commissioning of Silicon |  | 5/10/06 | 5/11/06 | 5/18/06 |
| 118 | Detector Closed for Tevatron Resumption |  | 6/01/06 | 6/02/06 | 6/4/06 |

## L1 Calorimeter Trigger

- Level 1 Calorimeter Trigger Upgrade
- Replace 10 racks of Run I calorimeter trigger electronics
- 80 Analog to Digital Filters (ADFs)
- 8 Trigger Algorithm Boards (TABs)
- 1 Global Algorithm Board (GAB)
- Sharpens trigger turn-on curves
- Provides specific object ID at Level 1 (electrons, jets, taus)
- Installation Overview
- Does not require collision hall access
- Trigger racks located in Movable Counting House
- However, new electronics physically displaces current Level 1 Calorimeter trigger electronics
- Decommissioning of current L1Cal trigger started after beam pipe was uncoupled (to facilitate calorimeter noise studies)
- Installation duration ~10 weeks

## Central Track Trigger

- Level 1 Central Track Trigger Upgrade
- Replace 40 Digital Front End Boards and associated infrastructure with DFEA2
- improve fake rejection capability of Central Track Trigger at higher occupancies due to increasing instantaneous luminosities
- makes use of full granularity of Central Fiber Tracker inputs
- Installation Overview
- Requires several weeks of collision hall access to remove current boards and install replacements
- Activity on platform will not interfere with Layer 0 installation
-  Requires intermittent access thereafter for debugging and verification of cabling
- Installation duration ~9 weeks

## Additional Trigger Upgrades

- Level 1 Calorimeter Track Match
- Electronics to provide new capability to match calorimeter and track objects at Level 1
- Improved rejection and tau triggering capability
- Requires change in trigger timing to implement this trigger upgrade
- Latency measurements complete
- Will require delay by 3*132nsec
- Muon system Proportional Drift Tube COBO must be modified to accommodate this change
- Level 2 Silicon Track Trigger
- Additional electronics to include Layer 0 detector inputs in Silicon Track Trigger
- To be installed in Movable Counting House
- Level 2 Processor Upgrades
- Facilitates handling of more complex events and implementation of improved algorithms
- Installation in progress (no collision hall access required)

## Summary of First Week Activities

- Major activities are related to reconfiguring the detector to allow access to the gap region and preparing to open the beam pipe
- Stick mic survey of detector location (Alignment)
- Open EF to lock EC beam  pipe in location
- Close EF
- Remove SNEG beampipe supports (AD support)
- Install remotely activated collapsible beam pipe spacer
- Open detector  (EF, CF, EC)
- Raise temperature of silicon coolant
- Install gap access hardware
- Prepare for disconnecting beryllium beam pipe
- Cut flanges off inside end of EC beam pipes

## Summary

- Shutdown involves substantial parallel efforts to install Run IIb upgrades of the DZero detector and make a smooth transition to commissioning and operations
- The Layer 0 installation schedule includes ~20% schedule contingency in the 14 week shutdown duration
- Resources identified and preparing for the installation
- backups for key Layer 0 installation team trained
- Need to complete these activities in a timely manner
- Lab is providing significant support