# ATLAS Team Trip Report

# Lawrence Berkeley National Laboratory

September/October 2000

  ------------------- ----------------------- ---------------------------
  Name of Traveler    Dates of Travel         Destination(s)

  Eric Anderssen      Sep 23-Oct 5, 2000      CERN, Geneva, Switzerland

  Kevin Einsweiler    Sep 24-Oct 7, 2000      CERN, Geneva, Switzerland

  Murdock Gilchriese  Sep 23-Oct 6, 2000      CERN, Geneva, Switzerland

  Neal Hartman        Sep 24-Oct 4, 2000      CERN, Geneva, Switzerland

  Emanuele Mandelli   Sep 25-Oct 2, 2000      CERN, Geneva, Switzerland

  John Richardson     Sep 23-Oct 4, 2000      CERN, Geneva, Switzerland
  ------------------- ----------------------- ---------------------------

### Purpose of Trip: Attend technical meetings of the ATLAS Detector at CERN.

### Summary: The design, status and schedule of the technical components of the ATLAS detector and systems were evaluated at a series of technical meetings at CERN. LBNL personnel participated in and made presentations at meetings related to the Pixel Detector Subsystem and participated in design reviews.

### Costs:

## 

##  

## Background and Purpose

Lawrence Berkeley National Laboratory (LBNL) is a member of ATLAS
Collaboration building the ATLAS detector at the Large Hadron Collider
at CERN in Geneva, Switzerland. LBNL is responsible for aspects of the
preparation of physics simulation tools and analysis, software
development for data acquisition and data analysis, the design,
development and fabrication of the Pixel Detector Subsystem and the
design, development and fabrication of Semiconductor Tracker Subsystem.

Technical and other meetings are held regularly at CERN or at other
locations as specified on page 1 to evaluate the design, status,
schedule and cost of the software development, of the components of the
Pixel Detector Subsystem and of the Semiconductor Subsystem. In
addition, laboratory measurements of components of the Pixel Detector
Subsystem and of the Semiconductor Tracker Subsystem are made at CERN in
collaboration with physicists and engineers from the other collaborating
institutions within the ATLAS Collaboration. Measurements of the
performance of prototype and final components of the Pixel Detector and
Semiconductor Tracker are also made in or near charged particle beams at
CERN.

## Activities

### ATLAS Collaboration and Inner Detector

The ATLAS Collaboration general meeting was held at CERN in October.
Some LBL members attended these meetings. The Inner Detector Steering
Group(IDSG) meeting was held on October 3. Presentations at this meeting
were made by Anderssen and Gilchriese. Einsweiler attended as a member
of the IDSG, in his role as pixel electronics coordinator.

### Pixel Detector Subsystem

A one week meeting of the ATLAS pixel collaborating institutions was
held to discuss in detail the technical status and near-term plans and
schedules for the Pixel Detector Subsystem. Future budgets and projected
costs were also discussed. The status of electronics, mechanics, silicon
sensors, services, test beam analysis, software for track reconstruction
and interfaces to other systems were evaluated.

## Roles

Eric Anderssen

Mr. Anderssen is the lead engineer at LBNL for the US work on the
mechanics of the pixel detector. He also has the responsibility for
integrating the pixel detector services and participated in and made
presentations at meetings on this subject. The major topic at the
mechanics discussions at the pixel week was the conceptual design for a
fully-insertable pixel system. This is a major change from the current
design concept precipitated by delays in the pixel electronics. Mr.
Anderssen developed a preliminary conceptual design for a
fully-insertable system. He worked with engineers from RAL to created
CAD models of this concept while at CERN. He created a revised
installation sequence. He made presentations to the Inner Detector
Steering Group on this topic.

Kevin Einsweiler

Dr. Einsweiler is the Electronics Coordinator for the ATLAS Pixel
Project. He led and made a number of presentations in meetings on the
integrated circuit electronics for the Pixel Detector, the off-detector
electronics and the power supplies. Detailed design meetings were held
by him on the design of the next prototype of the integrated circuits
needed for the Pixel Detector. Schedules and plans were developed with
European collaborators. He participated in other Pixel Detector
meetings. He presented the status and proposed plan for electronics
development to the Pixel Detector Steering Group. He organized and led a
multi-day design workshop on the next prototype pixel IC. He attended
the ReadOut Driver workshop at the University of Geneva near CERN.

Murdock Gilchriese

He participated in Pixel Detector meetings and in the Pixel Detector
Steering Group meeting. He presented the concept for an insertable
layout at the Inner Detector Steering Group meeting.

Neal Hartman

Mr. Hartman is a mechanical engineer that joined the ATLAS effort
recently. He presented his results on prototype fabrication and test of
cooling connections and other items at the mechanics meeting held during
the pixel week. He developed with Mr. Anderssen and RAL engineers a CAD
model of the proposed fully-insertable pixel layout while at CERN.

Emanuele Mandelli

He presented his work on the design of the pixel front-end integrated
circuit to the pixel electronics group. He took part in the design
workshop on the next prototype IC organized by Dr. Einsweiler.

John Richardson

Dr. Richardson presented test results obtained by him at LBNL on
measurements of the pixel prototype integrated circuits and related
assemblies. He attend pixel electronics design meetings.

## Recommendations

The proposed fuly-insertable pixel layout has implications for future
LBNL responsibilities. The mechanical design concept is substantially
different than previous designs and requires a new mechanical structure
for supporting the pixel detector. In addition, significant changes
would be required in the mechanical support of services, in the cable
plant and other items. It is likely that the LBNL mechanical
responsibilities might change if the proposed new layout is accepted by
ATLAS.

## Appendix I

### Itinerary

  ---------------- -------------- ------------- ------------- -------------
  Traveler         Departure      Departure     Arrival Date  Arrival Point
                   Point          Date                        

  Eric Anderssen   San Francisco  June 10, 2000 June 11, 2000 Geneva,
                                                              Switzerland

  Kevin Einsweiler San Francisco  June 11, 2000 June 12, 2000 Geneva,
                                                              Switzerland

  Murdock          San Francisco  June 10, 2000 June 11, 2000 Geneva,
  Gilchriese                                                  Switzerland

  Emanuele         Milano, Italy  June 14, 2000 June 14, 2000 Geneva,
  Mandelli                                                    Switzerland

  Roberto          San Francisco  June 12, 2000 June 13, 2000 Geneva,
  Marchesini                                                  Switzerland

  John Richardson  San Francisco  June 10, 2000 June 11, 2000 Geneva,
                                                              Switzerland

  Tom Weber        San Francisco  June 10, 2000 June 11, 2000 Geneva,
                                                              Switzerland

  Jon Wirth        San Francisco  June 10, 2000 June 11, 2000 Geneva,
                                                              Switzerland
  ---------------- -------------- ------------- ------------- -------------

### Persons Contacted

The ATLAS Collaboration is very large - approximately 150 institutions
and 1500 physicists. It is not possible to list here all of the persons
contacted during ATLAS meetings.

### Literature

Minutes and copies of the presentations given at ATLAS meetings are
available electronically from the ATLAS Web site