Lumi Cal Beam Cal and Gam Cal William
Lumi. Cal, Beam. Cal and Gam. Cal William Morse - BNL W. Morse Si. D FNAL April 2007 1
Lumi. Cal • • Si. D Do. D: 0. 02 < < 0. 14 rad 0. 998 < cos < 0. 99 Probably will be changed to about. 03< <. 14 Vetoes ee ee ee events (SUSY search) Integrated L to better than 0. 1% (√s=0. 5 Te. V) L fiducial region probably 0. 04 < < 0. 08 rad 106 fermion anti-fermion, gauge boson evts/yr W. Morse Si. D FNAL April 2007 2
Precision Tests of the SM: Indirect Signals of New Physics • Common feature of many models is a contact interaction type signature New gauge bosons, Large extra dimensions, Compositness, Leptoquarks, String excitations. . W. Morse Si. D FNAL April 2007 3
Lumi. Cal • Measures L to 10 -4 for Giga Z • OPAL Luminometer 1999 Bhabha syst error 5. 4 10 -4 d. L/L systematic error 3. 4 10 -4 Energy response d. L/L 1. 8 10 -4 Radial metrology d. L/L 1. 4 10 -4 Distance measurement d. L/L 0. 5 10 -4 W. Morse Si. D FNAL April 2007 4
Collaboration High precision design W. Morse Si. D FNAL April 2007 5 DESY-PRC 2006
Beam. Cal • . 003 < <. 02 rad • Veto ee ee events with 99. 9% efficiency • Measure the 104 beam-strahlung e+epairs/BX for beam diagnostics • 2 -10 MGy/year W. Morse Si. D FNAL April 2007 6
W. Morse Si. D FNAL April 2007 7
FCAL R&D Collaboration • W. Lohmann (DESY Zeuthen) spokesman • W. Morse (BNL) beam diagnostics (Beam. Cal/Gam. Cal) coordinator • B. Pawlik (Cracow) simulations coordinator • W. Lange (DESY) sensors coordinator • TBD electronics coordinator • W. Wierba (Cracow) Lumi. Cal laser alignment coordinator W. Morse Si. D FNAL April 2007 8
U. S. Forward (Si. D) • G. Haller, A. Abusleme, M. Breidenbach, D. Freytag (SLAC): Beam. Cal readout design • Z. Li (BNL): Beam. Cal radiation damage issues • B. Parker (BNL): machine interface issues • M. Zeller, G. Atoian, V. Issakov, A. Poblaguev (Yale): Gam. Cal design issues • Y. Nosochkov (SLAC): Extraction line issues • U. Nauenberg (Colorado): SUSY studies W. Morse Si. D FNAL April 2007 9
Luminosity Feedback Detectors: Beam. Cal and Gam. Cal • Reference Desgin Report: W. Morse Si. D FNAL April 2007 10
Nominal ILC Parameters Parameter ILC SLC L (cm-2 s-1) 2 1034 2 1030 y 5 nm 500 nm x 500 nm 1500 nm W. Morse Si. D FNAL April 2007 11
Achieving the Design Luminosity Will Be a Challenge • Bunch P- (t) {N, E, x, y, z, x, y, z, xy, x, y} • Bunch P+(t) {N, E, x, y, z, x, y, z, xy, x, y} • Instantaneous Luminosity: y x W. Morse Si. D FNAL April 2007 12
Beam-strahlung • • • F = e(E + c B). Bmax 1 KT Instantaneous power radiated: P 3% Pe N 1. 5 Ne Bethe-Heitler: e → e e+e BH 38 mb <E> 1 Ge. V Landau-Lifshitz: ee → ee e+e LL 19 mb <E> 0. 15 Ge. V Other processes much smaller • C. Rimbault et al. , Phys Rev ST AB 9, 034402 (2006). W. Morse Si. D FNAL April 2007 13
Bethe-Heitler Pairs • e → e e+e- For left and right detectors separately: N+/ x y and N-/ x y. W. Morse Si. D FNAL April 2007 14
Vertical offset E Beam. Cal (Te. V) W. Morse Si. D FNAL April 2007 15
Vertical Offset R (10 -6) W. Morse Si. D FNAL April 2007 16
Bunch Height W. Morse Si. D FNAL April 2007 17
Bunch Length W. Morse Si. D FNAL April 2007 18
Gam. Cal Detector Concepts • 14 mrad crossing angle • 180 m downstream of IP • 10 -4 - 10 -6 X 0 to convert beam-strahlung gammas into e+e- pairs • Converter could be gas jet or a thin solid converter • Magnet to separate pairs from beam electrons W. Morse Si. D FNAL April 2007 19
Beam-strahlung Z ee. Z W. Morse Si. D FNAL April 2007 20
Gam. Cal Backgrounds W. Morse Si. D FNAL April 2007 21
Z ee. Z vs. e. Zee • Electron carries virtual gammas • Landau Lifshitz conversion of virtual gammas W. Morse Si. D FNAL April 2007 22
Ratio of Z ee. Z vs. e. Zee W. Morse Si. D FNAL April 2007 23
Production Compared to ee • • • p eep 10 mb p N 0. 5 mb in resonance region p N 0. 1 mb E > 4 Ge. V ep e N 10 -3 mb Thus ep e N is negligible W. Morse Si. D FNAL April 2007 24
Polarimeter/Gamma Chicane BVEX 1 G BVEX 2 G P laser W. Morse Si. D FNAL April 2007 25
BVEX 2 G Magnet Works Well 0. 1 Ge. V/c 1. 0 Ge. V/c 10 Ge. V/c BVEX 2 G W. Morse Si. D FNAL April 2007 26
FY 07 LCDRD R&D Request • • • Univ. of Colorado $76 K Beam. Cal Physics Simulations Yale University $40 K Gam. Cal Design Studies BNL $390 K MCZ Si for Beam. Cal, Integration of Detectors and Beamline, Gam. Cal • Collaborators: SLAC, DESY Zeuthen W. Morse Si. D FNAL April 2007 27
Milestones • FY 07 Project Activities and Deliverables 1. Concept for detectors integrated with extraction 2. Radiation hardness studies completed 3. Concept for readout • Project Activities and Deliverables FY 08 -9 1. Prototypes in test beam 2. Efficiency detecting 2 photon processes in Si. D 3. Final conceptual design W. Morse Si. D FNAL April 2007 28
Extra Slides W. Morse Si. D FNAL April 2007 29
1 2 y z + - W. Morse Si. D FNAL April 2007 30
Perfect Collisions W. Morse Si. D FNAL April 2007 31
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