С.Белостоцкий сессия 2010 OLYMPUS эксперимент В. Андреев С.Белостоцкий Д.Веретенников Г.Гаврилов А.Изотов А.Киселев П.Кравченко А.Крившич О.Миклухо Ю.Нарышкин + Отд.трек.дет.

Born ep CROSS SECTION AND POLARIZATION TRANSFR Unpolarized cross section С.Белостоцкий сессия 2010

Born ep CROSS SECTION AND POLARIZATION TRANSFR Unpolarized cross section Proton magnetic form factor С.Белостоцкий сессия 2010

Born ep CROSS SECTION AND POLARIZATION TRANSFR Unpolarized cross section Proton magnetic form factor С.Белостоцкий сессия 2010

Born ep CROSS SECTION AND POLARIZATION TRANSFR Unpolarized cross section Proton magnetic form factor иными словами, распределения заряда и магнетизма в протоне совпадают вплоть до растояний порядка fm -1 !! С.Белостоцкий сессия 2010

Puzzle of Proton Form Factor Ratio С.Белостоцкий сессия 2010

Dramatic discrepancy between Rosenbluth and recoil polarization technique Jefferson Lab Measurement of recoil proton polarization Puzzle of Proton Form Factor Ratio С.Белостоцкий сессия 2010

Contribution of Two Photon Exchange Effects ?? + e,p bremschtr. С.Белостоцкий сессия 2010

Contribution of Two Photon Exchange Effects ?? + e,p bremschtr. С.Белостоцкий сессия 2010

Contribution of Two Photon Exchange Effects ?? Charge asymmetry P.G. Blunden et al., Phys. Rev. C 72, (2005) + e,p bremschtr. С.Белостоцкий сессия 2010 Model dependent

OLYMPUS Ebeam=2 GeV area Dec.2010 С.Белостоцкий сессия 2010

The OLYMPUS Experiment The OLYMPUS Experiment Electrons/positrons (100mA) in multi-GeV storage ring DORIS at DESY, Hamburg, Germany Unpolarized internal hydrogen target (like HERMES) 3 x at/cm 100 mA L = 2x10 33 / (cm 2 s) Measure elastic e + /e - proton scattering to 1% precision at 2 GeV energy with ε range from 0.4 to 1 at high Q 2 ~ 2-3 (GeV/c) 2 using the existing Bates Large Acceptance Spectrometer Toroid Experiment requires switching from e + beam to e - beam on timescale of 1 day. Redundant monitoring of luminosity, pressure, temperature, flow, current measurements - small-angle elastic scattering at high ε and low Q 2 С.Белостоцкий сессия 2010

Создана Коллаборация OLYMPUS; Разработан TDR, в котором обозначен материальный и интелектуальный вклад участников в эксперимент; ПИЯФ и DESY подписали MoU о проведении эксперимента и об обязательствах сторон ; Эксперимент оффициально одобрен Департаментом Энергии США с гарантией финансовой поддержки; Администрация ОФВЭ поддерживает эксперимент и выделяет средства на разработку и изготовление аппаратуры, являющейся материальным вкладом института; Администрация DESY поддерживает эксперимент и содействует его проведению. Статус эксперимента и вклад ПИЯФ Разработана и производится трековая система монитора светимости (7 модулей пропорциональных камер, XUV-плоскости, шаг 1мм, всего на каналов) для ep-elastic монитора. Проп.камеры будут использоваться в комбинации с GEM дет. ПИЯФ является отвественным за Slow Control; ПИЯФ участвует в Monte- Carlo моделировании эксперимента и в обработке и анализе экспериментальных данных. С.Белостоцкий сессия 2010

time-of-flight scintillators target GEM trackers 12deg luminosity GEM+MWPC magnet coils drift chambers Moller/Bhab h luminosity calorimeters DORIS beam OLYMPUS Experiment С.Белостоцкий сессия 2010 ep – coincidences, tracking, TOF, Δp/p

12 deg Luminosity Monitor 3GEMs+3MWPCs left /right symmetrical located between toroid coils serious difficulties with lack of space 3GEMs+3MWPCs MC-tracking simulation PCOS readout С.Белостоцкий сессия 2010

Target System DESY integration: Will be new vacuum segment. Valves controlled by DESY vacuum group. Pumps and internal valves will be controlled by OLYMPUS Target Beamline С.Белостоцкий сессия 2010

Test Beam Time in 2011 TOF bars (spares from OLYMPUS) 3 Lumi GEM detectors 2 MWPC (prototype) 16 lead glass detectors (Bonn) Installation week January С.Белостоцкий сессия 2010

Time lines Done -DCs wiring and tests -Toroid powering, control field mapping -TOF scint. counters revised, checked -Target cell fabricated Well on track -DORIS beam e + /e - test GeV -IP area preparation, target installation January In construction GEM trackers 12 deg lumi: GEM+MWPC Möller/Bhabha lumi calo Test run start January 2011 Detector commissioning in parking position February 2011 Detector commissioning in DORIS beam August 2011 Data taking 2012 С.Белостоцкий сессия 2010

BACKUP SLIDES

Richard MilnerDESY April 6, Projected OLYMPUS uncertainties

Richard MilnerDESY April 6,

Target cell installed and aligned Cold-head installed Pumps and controllers connected Vacuum gauges connected Target System R. Beck, F. Brinker DESY MAC 2010

Shipped without wires Completely re-wired Currently –electronics assembly Wire Chambers R. Beck, F. Brinker DESY MAC 2010

Existing radiation hard PbF 2 crystals Assembly and testing Moller/Bhabha Luminosity Monitor R. Beck, F. Brinker DESY MAC 2010

Radiative Corrections & TPE graphs Calculable standard radiative correction Contribution from two photon exchange diagram not taken into account in traditional analysis may be an explanation S.Belostotski Seminar HEPD, May Change sign

ELASTIC ep SCATTERING AMPLITUDE,CROSS SECTION AND POLARIZATION TRANSFR Using M one may calculate all necessary observables: Unpolarized cross section Spin transfer from longitudinally polarized electron to recoil proton under study S.Belostotski Seminar HEPD, May

Extraction of FFs from Unpolarized Elastic e-p Scattering Proton magnetic form factor By far not ideal but acceptable parameterization S.Belostotski Seminar HEPD, May

Schedule for studies Operation at 2.3 GeV successfully tested in 2009/2010 Electron tests in February 2011 First runs with test experiment in February 2011 Test runs without detector during two service weeks in April and June 2011 ( ~ 48 hours each week ) Starting full operation with detector in August 2011 Detector commissioning and beam studies during service weeks in September and October parasitic running at 4.5 GeV ( w/o target ) Possibilities for access and short tests on most Wednesdays 1 week commissioning in January shifts in 1 week 4 days 2 days _______ 12 days