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Linear Collider Detector R&D
Launched new effort in US in 2002
LCRD, UCLC Scope defined in discussion with DOE/NSF

Anticipated annual growth
USLCSG commissioned review process and established two review panels

Detector R&D chaired by Howard Gordon Accelerator R&D chaired by Norbert Holtkamp
Two years have passed and we enter our third year

Time to assess how we are doing

Jim Brau

LC Detector R&D

July 29, 2004


Background for LC Detector R&D Program
Identified Priorities in 2002
Summaries at workshops at Fermilab, Cornell, and SLAC Developed International Coordination (Int'l R&D Panel and report)

LC Detector were found to pose new challenges that differed from LHC experiments, defined by the very different experimental conditions, requiring coordinated R&D effort
Precision Speed Readout Granularity Hermiticity Integration Response Beam measurements

J. Brau - Detector R&D, Victoria- July 29, 2004

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LC Detector R&D Program Challenges
Precision Frontier
The linear collider is fundamentally a precision machine, with significant discovery potential

Speed Challenge
The X-band linear collider delivers events in 1.6 nanosecond bunches detector response must be fast

Higgs properties Superpartner properties Asymmetries Top quark properties W and Z properties
Precision measurements require special care in detectors which are not achievable without further R&D Unburdened by the high radiation levels of the LHC, the LC offers to opportunity for enhanced physics One (important) example: Energy Flow Calorimetry has great potential, but must be developed

Readout Challenge
The Superconducting RF linear collider demands handling of data between bunchs, every 337 nseconds. RF interference is known to be a problem from SLC experience - need to characterize and ameliorate

Granularity Challenge
All detector subsystems require high degree of granularity for optimal performance

Hermiticity Challenge
Forward detection critical for new physics channels

Integration Challenge
How can you build a realistic detector without compromising these important features
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J. Brau - Detector R&D, Victoria- July 29, 2004


LC Detector R&D Program Challenges
Beam Measurement Challenges
CMS energy Measurement Smuon mass: 1000 ppm(24 Mev for 220 GeV smuon) Top mass: 200 ppm(35 Mev) Higgs mass: 200 ppm(25 MeV for 120 GeV Higgs) Measure beam polarization goal 0.2% precision Luminosity measurement Total cross sections: absolute L/L to ~0.1% threshold scans : core width to <0.05% ECM and tail population L/L to <1%
*The optional Giga-Z program requires better precision for luminosity and beam energy measurements, J. Brau - Detector R&D, Victoria- July 29, 2004 4


LC Detector R&D Program Frontiers
Some Comparisons to LHC
Vertex Detector layer thickness CMS 1.7 % X0 ATLAS 1.7 % X0 LC 0.06% X0 Vertex Detector granularity CMS 39 Mpixels ATLAS 100 Mpixels LC 800 Mpixels Tracker thickness: CMS 0.30 X0 ATLAS 0.28 X0 LC 0.05 X0 ECAL granularity (detector elements) CMS 76 x 103 ATLAS 120 x 103 LC 32 x 106
J. Brau - Detector R&D, Victoria- July 29, 2004 5


A University Program of Accelerator and Detector Research for the Linear Collider 2003 Proposal

2002 Proposal

Pr oposed Budget

No. pr ojects

Accelerator Physics $1,003, Luminosity, Energy, Polarizatio $171, Vertex Detector $119, Tracking $395, Calorimetry $514, Muon system and Particle ID $148, TOTAL

783 541 100 662 540 899

33 9 3 11 12 3 71

$2,353,525

http://www.hep.uiuc.edu/LCRD/html_files/proposal.html http://www.hep.uiuc.edu/LCRD/pdf_docs/LCRD_UCLC_Big_Doc/

J. Brau - Detector R&D, Victoria- July 29, 2004

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$©$

DOE Grants

$©$

DOE responded to the proposals in FY03 and FY04 by funding 14 university LC detector R&D efforts FY03 FY04
Lum/Energy/Pol Calorimetry Muons Particle ID Tracking Vertex 4 3 2 1 2 2 4 (1) 6 (2) 3 5 (1) 2

» NOTE : Parenthesis refers to UCLC projects

and 12 university LC accelerator R&D projects in FY03
4 supplements and 8 new grants about $500k for detector R&D and about $400k for accelerator R&D in FY03 and about $700k for detector R&D and about $400k for accelerator R&D in FY04

J. Brau - Detector R&D, Victoria- July 29, 2004

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What Now?
While we have had some success, let's face it, it is still disappointing. We must do better! What can we do to improve our funding levels? We need to prepare a better strategy Organize the R&D more explicitly around whole-detector designs Detector Design Studies are critical to this Strengthen our arguments Listen to the agencies and react

J. Brau - Detector R&D, Victoria- July 29, 2004

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Detector Development and Planning
Physics and Detector Studies and R&D are being conducted, coordinated, and merged to the extent possible through the Worldwide Study

http://blueox.uoregon.edu/~lc/alcpg

http://blueox.uoregon.edu/~lc/wwstudy
F. Richard
J. Brau - Detector R&D, Victoria- July 29, 2004 9


Detector R&D is Critical

Graphically summarized by Jae Yu

J. Brau - Detector R&D, Victoria- July 29, 2004

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Moving Forward
We have started a very good Detector R&D program. Now is the time to ramp it up and deal with the critical issues. What are the critial R&D needs for the detector design studies
Silicon Detector Tesla TDR Detector/Large Detectors John Jaros Rolf Heuer

J. Brau - Detector R&D, Victoria- July 29, 2004

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