[Olympus] Abstracts for the DPG spring conference in March in Mainz

Fri Jan 6 07:49:40 EST 2012

Dear all,

just as a reminder: If you are APS members you are eligible to register 
at a reduced rate for the DPG spring meeting. This also works for the 
online registration, but probably you won't miss it - it is explicitly 
written on that page. It also works the other way round (DPG members can 
register paying a reduced fee for the APS meeting, but then registration 
is possible via fax only).

Cheers,

Jürgen

Michael Kohl wrote:
> Dear Colleagues,
>
> please find below speaker nominations and abstracts for the DPG spring 
> conference on March 19-23, 2012 in Mainz. We have permission for late 
> submission of one group talk and two contributed talks. We will also 
> try to put in a poster. Please send me any comments and suggestions as 
> soon as possible. I am planning to submit the final abstracts before 
> Monday.
>
> Best regards
>     Michael
>
>
>
> "Das OLYMPUS-Experiment am DESY"
> Alexander Winnebeck, MIT, Cambridge, Massachusetts, USA
> for the OLYMPUS Collaboration
> Group talk (in German)
>
> Das am DESY in Hamburg betriebene OLYMPUS Experiment untersucht den 
> Beitrag des Zweiphoton-Austauschs in elastischer Elektron-Protonstreuung 
> durch Messung des Verhaeltnises der Wirkungsquerschnitte von elastischer 
> Elektron- zu Positron-Proton-Streuung. 
> Im DORIS Speicherring, der sowohl Elektronen- als auch Positronenstrahlen 
> zur Verfuegung stellt, wurde ein internes H2-Gastarget installiert, 
> welches von einem magnetischen Spektrometer mit groer Akzeptanz umgeben 
> ist. In diesem Vortrag wird eine Uebersicht ueber die physikalische 
> Motivation und den experimentellen Aufbau gegeben. Die erste Datennahme 
> wurde im Februar 2012 beendet und erste vorlaeufige Ergebnisse werden 
> ebenfalls praesentiert.
>
>
> "OLYMPUS tracking"
> Axel Schmidt, MIT, Cambridge, Massachusetts, USA
> for the OLYMPUS collaboration
> Contributed talk
>
> The OLYMPUS Experiment, underway at DESY, in Hamburg, Germany, is
> measuring the cross-section ratio between electron and positron 
> elastic scattering from protons to definitively determine the two-photon 
> contribution to lepton-proton scattering. Elastic events are selected by 
> tracking the outgoing leptons and protons with a large acceptance magnetic 
> spectrometer to determine the scattering angles, momenta, and vertex. Two 
> large drift chambers each with 18 planes of sense wires are used to 
> determine the particle trajectories. Hits in each sense wire plane are 
> combined to form a three dimensional track through the detector. The 
> design of the OLYMPUS drift chambers, as well as a description of the 
> track reconstruction will be presented.
>
>
> "OLYMPUS Luminosity Monitoring"
> Ozgur Ates, Hampton University, Hampton, Virginia, USA
> for the OLYMPUS collaboration
> Contributed talk
>
> The OLYMPUS experiment at DESY will measure the ratio of positron-proton 
> and electron-proton elastic scattering cross sections to quantify the 
> effect of two-photon exchange, which is widely considered to be 
> responsible for the discrepancy between measurements of the proton 
> electric to magnetic form factor ratio with the Rosenbluth and 
> polarization transfer methods. In order to control the systematic 
> uncertainties to the percent level, the luminosities are monitored 
> redundantly with high precision by measuring the rates for symmetric 
> Moller and Bhabha scattering, and by measuring the ep-elastic count rates 
> at forward angles and low momentum transfer with tracking telescopes based 
> on GEM (Gas Electron Multiplier) and MWPC (Multi Wire Proportional 
> Chamber) technology. The production, installation, and commissioning of 
> the OLYMPUS GEM luminosity monitors will be presented.
>
>
>
> "The OLYMPUS Experiment at DESY"
> to be presented by TBD
> for the OLYMPUS collaboration
> Poster presentation
>
> The OLYMPUS experiment underway at the DESY laboratory in Hamburg 
> will determine the two-photon contribution to electron-proton elastic 
> scattering by measuring the cross section ratio between electron and 
> positron elastic scattering from the proton. The experiment utilizes the 
> storage ring DORIS at DESY with an internal gas target and a large 
> acceptance magnetic spectrometer. An overview of the physics motivation 
> for the experiment plus a description of the detector system will be 
> presented. The first data run was completed in February, 2012 and 
> preliminary results on the experimental operation and performance will 
> also be discussed.
>
>
>
> +---------------------------------------------------------------------
> | Dr. Michael Kohl, Assistant Professor and Staff Research Scientist
> | Physics Department, Hampton University, Hampton, VA 23668
> | Jefferson Lab, C117, 12000 Jefferson Avenue, Newport News, VA 23606
> | Phone: +1-757-727-5153 (HU), +1-757-269-7343 (Jlab)
> | Fax:   +1-757-728-6910 (HU), +1-757-269-7363 (Jlab)
> | Email: kohlm at jlab.org
> | Cell:  +1-757-256-5122 (USA)
> |
> | Deutsches Elektronen-Synchrotron DESY, Bd. 66, Rm. 6,
> | Phone: +49-40-8998-6406, Cell: +49-171-101-1967
> +---------------------------------------------------------------------
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>   

-- 
Jürgen Diefenbach

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