1. U.S. ATLAS Executive Meeting Upgrade R&D August 3, 2005Toronto, Canada A. Seiden UC Santa Cruz

2. 2 Introduction FY06 we are planning to continue work on R&D for a new inner detector and on Liquid Argon readout electronics. Just completed workshop on inner detector R&D in Genova, Italy on July 18-20. Very thorough discussion of issues. Approximately 100 people attended. Some outcomes: Plan to request formation of an Upgrade Project Office as part of TC. Rough schedule outlined. Need to complete key R&D by 2009. This includes radiation testing of components. Work on TDR in 2009. Development work through 2012 and then full scale construction. U.S. R&D effort that began a year ago fits in well with overall ATLAS goals expressed in Genova.

3. 3 Inner Detector Geometry General layout ideas pretty clear. One inner removable pixel layer. Remainder of detector in one volume. Total of: 3 pixel layers, 4 short-strip layers, 2 long-strip layers. Some questions: Replace innermost short-strip layer with pixel layer? Should there be 3 long-strip layers? Which layers have stereo information?

4. 4 Liquid Argon Liquid Argon work not yet organized into overall ATLAS program. However, U.S. groups have made a detailed overall plan, endorsed by the ATLAS liquid argon group. Strawman Target for FY06 from U.S. ATLAS for Upgrade R&D has been: Silicon Upgrade R&D$1,506k Liquid Argon Upgrade $494k $2,000k

5. 5 Upgrade R&D Program for FY05 Plan for U.S. ATLAS Upgrade R&D for FY05. The people working on these projects are all in good communication and a true overall collaboration is developing. The program elements, all representing unique work directed at the high luminosity environment of an upgraded ATLAS, are as follows: 1) Development of a stave readout structure. This is a collaboration of BNL, Hampton, and LBNL, with UCSC anticipated to join later. This work leverages past effort for CDF in developing stave structures that minimize material, cabling, and power connections. Improvements in these areas are essential to fit a new tracker with many more channels into the space available in the ATLAS detector. 2) Development of a stripixel detector with small angle stereo readout and other features required to survive high integrated luminosity. These detectors look like a very promising choice for radii between about 25 and 65 cm. This is a unique U.S. effort and leverages past work on these detectors at BNL. This work will be done at BNL, but the detectors developed will be integrated into the stave structure in (1) and will fit together with the work on detector materials in (3). 3) Evaluation of detector materials, new choices for electronics, and development of a short strip detector (alternative to the stripixel detector, but also likely choice for outer tracking elements). New commercial electronics technologies will be evaluated for use with high-capacitance load detectors such as short strip or stripixel detectors. This work, which will be done at UCSC, leverages the effort within the RD50 collaboration on materials based on collaborative work that has been established, and funding from the DOE ADR program. A goal is to eventually integrate a radiation hard detector into the stave structure and to provide input on materials to the stripixel effort. 4) Work on 3-D pixel detectors. These detectors provide one of a very small number of alternatives for detectors inside of a radius of about 15 cm. The detector concept originated in the U.S. and we can leverage work toward other applications, particularly in biology. This is a collaboration of the Univ. of Hawaii and the Univ. of New Mexico. They will provide detectors and evaluate their radiation properties after irradiation. The LBNL pixel group collaborates informally regarding readout issues. 5) Characterization of readout chips using 0.13 micron CMOS. This work is essential for detectors of the future as industry is shifting to smaller feature size. The detailed chip design, layout, and measurements will be done by LBNL. This group has already submitted a chip (last year) and the effort is based on several years of work developing the present ATLAS pixel chip.

6. 6 FY05 Upgrade R&D Program Funding: Upgrade R&D for FY 05 BNL87,500 Hampton20,000 LBNL165,000 UCSC100,000 Univ. of Hawaii63,500 Univ. of New Mexico63,500 Total499,500

7. 7 Non-Tracker Projects in FY05 Novel Data Transmission Scheme at SMU$20k Development of Monitors in Muon Region, Arizona$30k

8. 8 Requests for FY06 My recommendations in parentheses where different from request. 1.) Development of Stave. In Genova, stave idea endorsed as essential. $250k 2.)Stripixel detector. Not clear if this will have adequate signal to noise. Understanding capacitance most important immediate issue. Should think about an overall ATLAS review, when generic performance numbers are clear. $164k 3.) Evaluation of detector materials and Si-Ge technology for electronics. Initial results indicate that n-on-p detectors are most suitable choice for short-strips. Si-Ge offers potentially factor of 3 power savings for analog front-end. $335k($300k) 4.) 3-D pixel detector presently only viable choice for inner pixel layer other than a layer we replace yearly. Need to make more progress than last year. $200k

9. 9 Requests for FY06 5.) Work on 0.13 micron CMOS and voltage conversion for powering modules. Very nice measurements made this past year on CMOS chip. Conceptual design of powering scheme worked out. Either this scheme or serial powering are essential for upgrade because of cabling constraints. $415k($200k) 6.) Work on optical readout. Plan based on working group meeting at Santa Cruz earlier this summer. Crucial to establish radiation limits of components and multiplexing schemes. Several schemes still possible. Institutions: Ohio State, Oklahoma, Oklahoma State, SMU, UC Santa Cruz. $430k($372k) Also want to continue radiation monitor work of Arizona at $20k in FY06. Total: $1,814k ($1,506k)

10. 10 Liquid Argon Projects 1.) Study of Charge Build up Effects. Arizona $66k 2.) Analog Front-End Asic BNL, SUNY $255k 3.) Digital Readout Architecture NEVIS $300k 4.) Digital Optical Links SMU $170k 5.) Level 1 Interface BNL, Pittsburgh $15k 6.) Analog Optical Links BNL $75k 7.) ROD BNL $60k 8.) Power Supplies $75k Total Request: $1,016k

11. 11 My Suggestions Delay items 5-8 and focus on other items. These are not as urgent or probably quite difficult (Analog Links). Makes it possible to get to $750k number, difficult to get to $494k target. This problem will persist into subsequent years unless target raised to $750k, or some tasks changed. Need some guidance on this issue. Would then discuss with Liquid Argon group.