# Presentation: 367788

## U.S. ATLAS Progress 

**1.  Pictures of equipment constructed in the six detector subsystems in U.S. ATLAS.**
**2.  Current issues:**
**Rate of Progress in Subsystems**
**Corrective actions on R.O.P.**
**Interfaces with ATLAS**
**Project aspect of computing**

**Bill Willis:**
- goes with picture of atlas with u.s. deliverables labeled, can we redo this one?

## 1. Silicon Tracking

**Space frame for the pixel detectors.  **
**Silicon strip module with ABCD electronics chips.**

**Bill Willis:**
- TWO pictures inset, with text beneath?  The reason I suggest this is that these pix are not meaningful to this audience anyway

## 2. TRT Straw Tubes

**Straw factory at Hampton and completed module 0 for the Barrel TRT in the space frame**

**Bill Willis:**
- here we have one nice big picture,
- of chamber or straws, and tiny corner on electronics, w/or wout picture

## 3. Liquid Argon EM Calorimeter

**U.S. technical people inspecting the aluminum rings and welds at the vendor which is manufacturing the Barrel Cryostat.**

**Bill Willis:**
- here we have two big pix, so two sheets, cryo and feedthroughs, gives room for small comments on other stuff

## Liquid Argon Signal Feedthroughs

**U.S. developed high density pin carriers for the signal feedthroughs.**

## 4. Scintillator Tile Hadron Calorimeter

**Submodule stacking at ANL.  **
**Work on front-end electronics ready for Production Readiness Review**

**Bill Willis:**
- one big picture of module in some stage, small comments on electronics

## 5.  Muon Tracking Detector

**Complete Prototype of a Monitored Drift Tube Chamber and tooling in Boston**

**Bill Willis:**
- picture of our prototype chamber

## 6.  Trigger and Data Acquision

**12U VME card**
**This assembles Region of Interest (RoI) fragments from several (<12) level 1 sources and distributes**
**them to supervisor CPU's which in turn assign events to LVL2 farm computers for the trigger decisions.  This board runs at the required 100kHz.**

**Bill Willis:**
- here there could be a big block diagram and a small photo of the recent version of the Supervisor

## Our schedule issues

**THE THEME OF THIS SUMMARY IS THE U.S. ATLAS SCHEDULE, AND INTEGRATION WITH ATLAS**
**WE HAVE ****KEPT**** U.S. DELIVERABLES ****ON TRACK**** IF NEAR THE “TRUE” ATLAS ****CRITICAL**** ****PATH****  **
**BUT**
**THERE IS A WIDE-SPREAD TENDENCY TOWARD A RATE-OF-PROGRESS GAP FOR THE  “****LESS CRITICAL”**** ITEMS**
**THESE HAVE BEEN MANAGED FOR ****MINIMUM COST****, TAKING INTO ACCOUNT  BASE PROGRAM RESOURCES, AND FLOAT, BUT WE MUST NOW ACCELERATE ****ALL**** SYSTEMS, BY CONTINGENCY, ****OR**** CHANGE SCHEDULES, IF “NOT U.S. DRIVEN”**

## Cost and Schedule Variances

## Lehman Review Assessment

**Scan lehman will be put here**

## Corrective Action, WBS 1.

**WBS 1, Silicon Strip and Pixel Detectors**
**   ****The Strip readout is seriously delayed due to **
**   ****ASIC design flaws discovered a year ago, but it is a joint effort with Europe, where the U.S. has assumed a larger role since the problem emerged, in order to accelerate the ATLAS deliverables overall, ie the U.S. is advancing**** ****the schedule, not delaying it.  We want to do more:**
**We will pay incentive fees to get in “hot fab” lines for two submissions, gaining  twice six weeks for $36K**
**We will add some temporary engineering ($20K) and some test hardware ($24K)**
**We then expect to make ATLAS Milestone end ‘99**

## Corrective Action, WBS 1.2

**We want to keep the start of production Milestone of the Straw Tube modules, in September.  The U.S. group believes that this can be done, despite the late (June) date of the meeting following up the Dec. 1998 PRR, where the last necessary decisions are being made.  We have encouraged them to get temporary help to keep this schedule and get production ok.**
**The U.S. has assumed a larger role in the readout electronics than foreseen, leading to a net improvement in the ATLAS schedule but a delay in the U.S. deliverables.  **
**Temporary help for the design engineering will be added, and optional improvements will be dropped or postponed.****    ****This will increase float.****   **

## Corrective Action, WBS 1.3

**One item in the Liquid Argon Calorimeter, the readout electrodes WBS 1.3.4.1, now appears to define the critical path of ATLAS, having suffered a delay in procurement by CERN.  This was not a responsibility of the U.S. though we are committed to supply a part of the cost, fixed at $2M (29%of the nominal total).**
**Recently we offered to help improve the schedule for this item by seeking another ****qualified**** vendor to produce 29% of the electrodes, with the U.S. to pay the actual cost, including following the procurement.**
**ATLAS has ****declined**** to take up this offer, deciding that their new approach with the selected vendor will succeed in supplying ****all**** the pieces needed on an accelerated production schedule, at a favorable cost.**

## Corrective Action in WBS 1.3, contd.

**Most U.S. deliverables in WBS 1.3 are ****linked ****to the electrode delivery in schedule and some are also at risk for design changes if the design of the electrodes were changed to ease their fabrication.  **
**We choose not to put into production the latter, leading to an apparent schedule delay that is misleading, since it is our deliberate choice.**
**We intend to change the schedule for these items, to reflect the links to the current ATLAS schedule.**
**We have added engineering in WBS 1.3.10, the Forward Calorimeter, to get the system to the point we need before authorizing production.**

## Corrective Action, WBS 1.4

**The Tile Calorimeter is the first detector to be installed in ATLAS, so it must be ready on schedule, though there is presently some float in the schedule.**
**Production of the calorimeter modules has begun at two sites, and no schedule problem is foreseen.**
**We will monitor the production closely, and add production manpower if needed.**
**The electronics for which the U.S. is responsible does not seem to offer a schedule challenge, but the digitizer component made in Europe might suffer a delay, and in this case we may offer to help.**

## Corrective Action, WBS 1.5

**Muons: the U.S. is responsible for most of the tracking chambers in the endcaps, MDT and CSC.**
**This is the last detector installed in ATLAS.**
**A big production of chambers built to 5 microns.**
**Drift Tube production in three sites, OK.**
**One site qualified by engineering prototype.**
**Needed: qualified ****tooling**** at all ****three**** sites, ****Configuration Control**** (that ****ATLAS cannot provide****) and ****Quality Assurance****.**
**U.S. Muons asked to get temporary people to execute these tasks quickly, using Contingency.**
**Drift Tube Electronics in good shape, U.S. has been providing test electronics for many sites.**

## Muon Actions, continued

**Cathode Strip Chambers a U.S. responsibility.**
**Chambers ready for production**
**More BNL base support for electronics assumed than now available**
**The ATLAS group at UC Irvine was pursuing one (DSP) of two options for the Silicon Detector strip and pixel Read Out Drivers;**
**Recently, WBS 1 chose the (Wisconsin/LBNL FPGA) solution as adequate, releasing a part of UCI effort. (Some added effort needed to replace them.)**
**They have joined the CSC Muons**** in WBS 1.5, ****filling a hole. (They will also use their DSP expertise to coordinate with the LA ROD, with possible cost savings.)**

## WBS 1.6 Schedule

**The Trigger/DAQ Subsystem has met its R & D Milestones, involving substantial work.**
**This system is not yet baselined, and is working on a level of effort basis.**
**We cannot identify any schedule issues at this stage.**

## Cost Implications of Corrective Actions

**We are substantial under the budget on the costing of our large procurements so far, probably by more than the charge to Contingency implied by the Corrective Actions described here.**
**Our Cost to Complete study will give firm estimate of the Contingency balance. It is estimated now to be 52%.**

## U.S. ATLAS COMPUTING

**In March and April I received letters from DOS and NSF asking that the U.S. ATLAS Project take on the responsibility for Computing.**
**The Resources will be provided outside the Project Budget**
**We intend to maintain the same level of Project Control for the computing as for the rest of the Project**
**We have named John Huth as Associate Project Manager for Physics and Computing**