**[Foreign Trip Report]{.underline}**

**[Part I]{.underline}**

<table>
<colgroup>
<col style="width: 21%" />
<col style="width: 2%" />
<col style="width: 2%" />
<col style="width: 2%" />
<col style="width: 0%" />
<col style="width: 1%" />
<col style="width: 0%" />
<col style="width: 1%" />
<col style="width: 3%" />
<col style="width: 1%" />
<col style="width: 18%" />
<col style="width: 45%" />
</colgroup>
<tbody>
<tr class="odd">
<td colspan="2"><blockquote>
<p><strong>1. Title of report:</strong></p>
</blockquote></td>
<td colspan="10"><h4 id="atlas-trip-report">ATLAS Trip Report</h4></td>
</tr>
<tr class="even">
<td><blockquote>
<p><strong>2. Report date:</strong></p>
</blockquote></td>
<td colspan="11"><h2 id="october-23-2001">October 23, 2001</h2></td>
</tr>
<tr class="odd">
<td colspan="3"><blockquote>
<p><strong>3. Date(s) of travel:</strong></p>
</blockquote></td>
<td colspan="9"></td>
</tr>
<tr class="even">
<td colspan="11"><blockquote>
<p><strong>4. Name of all traveler(s) on this trip report:</strong></p>
</blockquote></td>
<td><p>E. Anderssen</p>
<p>A. Ciocio</p>
<p>K. Einsweiler</p>
<p>M. Garcia-Sciveres</p>
<p>M. G. D. Gilchriese</p>
<p>N. Hartman</p>
<p>I. Hinchliffe</p>
<p>J. Richardson</p>
<p>J. Siegrist</p></td>
</tr>
<tr class="odd">
<td colspan="9"><blockquote>
<p><strong>5. Position/title of traveler:</strong></p>
</blockquote></td>
<td colspan="3"><h3 id="section"></h3></td>
</tr>
<tr class="even">
<td colspan="10"><blockquote>
<p><strong>6. Employing organization:</strong></p>
</blockquote></td>
<td colspan="2"><h2
id="ernest-orlando-lawrence-berkeley-national-laboratory-organization-code-lb">Ernest
Orlando Lawrence Berkeley National Laboratory Organization Code:
LB</h2></td>
</tr>
<tr class="odd">
<td colspan="4"><blockquote>
<p><strong>7. Business address:</strong></p>
<p><strong>(street, city, state and zip)</strong></p>
</blockquote></td>
<td colspan="8"><blockquote>
<p>One Cyclotron Road, Berkeley, CA 94720.</p>
</blockquote></td>
</tr>
<tr class="even">
<td colspan="7"><blockquote>
<p><strong>8. FTMS trip number:</strong></p>
</blockquote></td>
<td colspan="5"><h1 id="section-1"></h1></td>
</tr>
<tr class="odd">
<td colspan="8"><blockquote>
<p><strong>9. Travel destinations:</strong></p>
<p><strong>(include organization, facility, city, state/province,
country)</strong></p>
</blockquote></td>
<td colspan="4"><blockquote>
<p>Geneva, Switzerland/CERN</p>
</blockquote></td>
</tr>
<tr class="even">
<td colspan="10"><blockquote>
<p><strong>10. Brief purpose of the trip:</strong></p>
</blockquote></td>
<td colspan="2"><blockquote>
<p>Attend technical meetings of the ATLAS Detector Collaboration.</p>
</blockquote></td>
</tr>
<tr class="odd">
<td colspan="6"><blockquote>
<p><strong>11. People contacted:</strong></p>
</blockquote></td>
<td colspan="6">Approximately 150 institutions and 1500 physicists</td>
</tr>
<tr class="even">
<td colspan="5"><blockquote>
<p><strong>12. Facilities visited:</strong></p>
</blockquote></td>
<td colspan="7"><h2 id="cern">CERN </h2></td>
</tr>
<tr class="odd">
<td colspan="5"><blockquote>
<p><strong>13. Abstract (such as major highlights, benefits of the
travel, results of meetings, including their locations)</strong></p>
</blockquote></td>
<td colspan="7"><h3
id="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-the-sct-subsystem-including-design-reviews-and-software-and-computing.">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, the SCT subsystem, including
design reviews and software and computing.</h3>
<p>.</p>
<h2 id="section-2"></h2></td>
</tr>
</tbody>
</table>

**Part II (Complete report on & thorough analysis of the trip)**

## 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

### 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 in detail. A conceptual
design review of the pixel support tube was held after the pixel week.
Presentations were made during the one-week meeting and at the design
review.

###  Silicon Strip Detector Subsystem

A one week meeting of the SCT subsystem was held. All aspects of the
project were covered. Presentations on the status of ASICs and on module
construction in the US were made.

##  {#section-3}

## Roles

E. Anderssen. Mr. Anderssen is the lead mechanical engineer at LBNL for
the US responsibilities for the mechanical structure related to the
ATLAS pixel detector. He held meetings with other engineers at CERN and
the University of Geneva to define interfaces to the US pixel mechanics
deliverables. He developed mechanical concepts to advance the design of
these deliverables. He made presentations of the status of the US design
and fabrication at a mechanics meeting during the pixel week meetings.
He made presentations at the conceptual design review of the pixel
support tube.

A. Ciocio. Dr. Ciocio made presentations on the status of ASIC
fabrication and testing for the SCT subsystem in the electronics and
plenary sessions of the SCT week meetings.. She also report on
measurements of the SCT hybrid thermal properties done at LBNL. She
consulted collaborators working in the areas of ASIC testing and hybrid
assembly and testing.

K. Einsweiler. Dr. Einsweiler is the electronics coordinator for the
pixel subsystem. He organized the agenda and led the one day meeting on
the status of pixel electronics status. He is a member of the Pixel
Detector Steering Group(PDSG). He summarized the status and near-term
plans for pixel electronics at a meeting of the PDSG. He served as a
reviewer for the ASSO review of the ATLAS trigger/DAQ system.

M. Garcia-Sciveres. Dr. Garcia-Sciveres is the US pixel module
coordinator. He made numerous presentations on the status of pixel
module assembly tooling in the US and measurements of thermal cycling of
pixel module mounted on mechanical support structures at the pixel week
meetings. He organized part of the pixel module meeting at the pixel
week. He was designated to become the overall pixel module coordinator
by the PDSG at its meeting following the pixel week.

M. Gilchriese is the outgoing U.S. Subsystem Manager for the U.S. ATLAS
Silicon Subsystem, which includes both the Pixel Detector and Silicon
Strip Detector systems. He is also a member of the Pixel Detector
Steering Group. He presented the status of pixel disk sector production
at the mechanics meeting during the pixel week. He also presented the
status of SCT module assembly during the SCT week. He also assisted in
the organization and planning for the pixel mechanics design review and
made presentations at the conceptual design review of the pixel support
tube. He represented the US at discussion of maintenance and operations
for the Inner Detector.

N. Hartman. Mr. Hartman is a mechanical engineer working on the design
of the pixel support tube and fittings(custom connectors) for the
cooling system of the pixel detector. He presented the status of work at
LBNL on the design and validation of custom cooling fittings. He also
presented the status of work on the design of the pixel support tube and
related interfaces, particularly to the barrel SCT. He prepared a
presentation on the latter for the conceptual design review of the pixel
support tube. A family emergency required him to return prematurely to
the US. Mr. Anderssen gave the presentation on his behalf.

I. Hinchliffe. Dr. Hinchliffe is the US physics coordinator and
interface to ATLAS computing and software. He is deputy physics
coordinator for ATLAS. He participated in planning meetings for
mock-date challenges 0 and 1 planned by ATLAS over the next year. He
also participated in the planning for core software development in which
LBNL has a major role.

J. Richardson. Dr. Richardson is co-coordinator of pixel test beam
activity. He is also primarily responsible for electronics and module
testing at LBNL. He presented and summarized the results of pixel module
testing at LBNL. He summarized the recent test beam activity and
proposed plans for test beam work in 2002.

J. Siegrist. Dr. Siegrist is a member of the advisory committee to the
Collaboration Board and a member of the M&O working group for ATLAS. He
is also the chairperson of the US Institutional Board. He participated
in meetings of the Collaboration Board committee. He also represented
LBNL at the ATLAS Collaboration Board meeting.

## Recommendations

## ***No changes in LBNL responsibilities within the ATLAS Collaboration resulted from these meetings and no impact on current DoE planning is foreseen.***

## Appendix I

### Itinerary

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

  M. Gilchriese    San Francisco                              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

##  {#section-4}