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Prof. Elmar Weiler (Rektor Ruhr-Universität Bochum), Erhard Steffens (University of Erlangen-Nürnberg), Werner Peter Meyer (Ruhr-University of Bochum)14/09/2015, 10:00
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Mei Bai (Forschungszentrum GmbH)14/09/2015, 10:30TalkEver since the discovery of spin, one of the fundamental properties of elementary particles, way back in the 1920s, polarized beams have played significant roles in scientific research and technology developments ranging from understanding fundamental properties of matter to medical applications like NMR. Recent developments of polarized protons at high energies enabled research in...Go to contribution page
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Dr Edward Stephenson (Indiana University)14/09/2015, 11:00TalkThis talk will summarize progress made at the Forshunngszentrum Juelich COSY ring on deuteron beam polarimetry for a storage ring search for an electric dipole moment. Tests have demonstrated the feasibility of using thick carbon targets for highly efficient and continuous observation of the stored beam polarization. After calibration of the sensitivity to geometric misalignments and pileup...Go to contribution page
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Christopher Keith (Jefferson Lab)14/09/2015, 11:30TalkFor nearly two decades, polarized solid targets have played a vital role in the nuclear physics program at Jefferson Lab and were successfully utilized in each of the lab's three experimental halls during its 6 GeV era. Following a brief review of their 6 GeV operation, I will discuss the role that polarized solid targets will play in JLab's future at 12 GeV.Go to contribution page
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Dr Oleg Eyser (Brookhaven National Laboratory)14/09/2015, 14:00TalkThe Relativistic Heavy Ion Collider (RHIC) has successfully collided polarized proton beams with momenta as high as 255 GeV/c and average polarizations up to P=60%. The polarization of the proton beams is vital input to any of the spin-dependent measurements at the RHIC experiments. The absolute beam polarization is determined through spin dependent elastic scattering with a polarized hydrogen...Go to contribution page
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Anatoli Zelenski (BNL)14/09/2015, 14:30Polarized source operation and polarization propagation through the RHIC accelerator chain will be discussed. In addition, absolute polarization measurements in 200 MeV polarimeter and polarized H-jet polarimeter will be presented.Go to contribution page
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Dr Grant Webb (Brookhaven National Laboratory)14/09/2015, 15:00TalkPolarization measurements of the proton beams at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory are integral for performing spin-dependent measurements. Proton-Carbon polarimeters monitor the beam polarization at RHIC using the asymmetry observed in carbon nuclei elastically scattered by the polarized proton beam. The very thin carbon targets are inserted into the...Go to contribution page
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Rebecca Koop14/09/2015, 16:00TalkAt the 3.2 GeV Electron Stretcher Facility ELSA, nucleon resonances are studied by performing beam-target double polarization experiments. For scattering experiments with circularly polarized photons, the stored electron beam's polarization needs to be optimized. As of now, this polarization can only be estimated via Moeller polarimetry by using the extracted electron beam. Continuous and...Go to contribution page
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Matthias Molitor (Johannes Gutenberg-Universität Mainz)14/09/2015, 16:25TalkThe P2 Experiment at the new Mainz Energy-recovering Superconducting Accelerator (MESA) aims at measuring the Weinberg-angle $\theta_\text{W}$ at low Q$^2$ with high precision. Therefore the polarization of the incident electron beam has to be known with a very high accuracy (< 0.3 %). A conventional Mott-polarimeter requires a lot of effort and expanses in calibration to be able to acieve...Go to contribution page
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Andrei Poblaguev (Brookhaven National Laboratory (US))14/09/2015, 16:50TalkIn RHIC Run 15 the new DAQ for the polarized hydrogen jet target polarimeter (HJET) was tested and employed. The DAQ based on JLAB 12 bit 250 MHz FADC and new set of silicon detectors allowed us to improve the quality of data analysis. Comparison of different methods of energy calibration of the detectors will be reported. The analysis of the signal shape was found to be very helpful for...Go to contribution page
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Fabian Nillius (Uni Mainz)14/09/2015, 17:30Atomic bremsstrahlung-polarisation correlation between incoming electrons and outgoing photons may allow to design a polarimeter capable of measuring all components of beam polarisation simultaneously. This device can be called a vector polarimeter. It might allow to test theoretical predictions of correlation coefficients between 1 and 3.5 MeV as well as work as a beam diagnostics device. As...Go to contribution page
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Jean-Philippe Lansberg (IPN Orsay, Paris Sud U. / IN2P3-CNRS)15/09/2015, 09:00TalkIn this talk, we review a number of recent ideas* put forward in favour of the use of a polarised target along with the proposed idea [Bro13] of a fixed-target experiment using the LHC beams - AFTER@LHC. If used in such a fixed-target mode, the multi-TeV LHC beams allow one to perform the most energetic fixed-target experiments ever and to study with high precision pp, pd and pA collisions at...Go to contribution page
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Dr Erhard Steffens (Univ. of Erlangen-Nürnberg)15/09/2015, 09:30TalkA storage cell target is capable of producing a high areal density at minimum gas flow into a vacuum system, e.g. that of the LHC. It may be fed with polarized hydrogen atoms for the study of single-spin asymmetries in ultra-relativistic fixed-target pp collisions, or similar light-ion reactions with spin. Another application could be to inject heavy noble gases like Xe ($M\approx131$) in...Go to contribution page
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Norihiro Doshita (Yamagata University (JP))15/09/2015, 10:00TalkThe COMPASS experiment at CERN is a universal facility which can operate with both muon and pion beams as well as with the longitudinally/transversely polarized solid target. The main goal of the experiment is to study the spin structure of the nucleon. The availability of pion beam provides an access to the Drell-Yan physics, i.e. to the process where quark(target)-antiquark(beam) pair...Go to contribution page
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Dr Irakli Keshelashvili (Forschungszentrum Jülich GmbH)15/09/2015, 11:00TalkIn the upcoming Jülich Electric Dipole moment Investigations (JEDI) project, the essential point would be to measure tiny beam polarization change over a long period. The particle scarcity in the polarized deuteron or proton beams and its slow extraction rate puts very difficult experimental limitations on the polarimetry. At present, the EDDA detector (build with plastic scintillators) is...Go to contribution page
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Mr Nils Hempelmann (Forschungszentrum Jülich GmbH)15/09/2015, 11:30TalkThe low energy polarimeter (LEP [1]) is a polarimeter in the injector of the Cooler Synchrotron (COSY [2]). COSY is a facility for cooled polarized beams at the Forschungszentrum in Jülich. The beam polarization is measured using scattering off carbon and polyethylene (CH2) targets. Up to now only elastic scattering off the carbon atoms is used for polarimetry. The outgoing particles are...Go to contribution page
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Joshua Magee (College of William and Mary)15/09/2015, 12:00TalkModern electron scattering experiments, and in particular those utilizing parity-violating electron scattering, require precise knowledge of electron beam polarization. Recently at Jefferson Lab Hall C, sub-percent beam polarization determination was achieved during the Q-weak experiment using two independent polarimeters. The Hall C Moller uses a pure iron foil that is driven...Go to contribution page
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Sebastian Mey (Forschungszentrum Jülich GmbH)15/09/2015, 14:00TalkThe JEDI Collaboration (Jülich Electric Dipole Moment Investigations) is developing tools for the measurement of permanent EDMs (Electric Dipole Moments) of charged, light hadrons in dedicated storage rings. The Standard Model predicts unobservably small magnitudes for these EDMs. A non-vanishing value due to CP violating sources beyond the Standard Model may be detected by measuring a tiny...Go to contribution page
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Jamal Slim (RWTH Aachen)15/09/2015, 14:30TalkThe Jedi collaboration is aiming for electric dipole moment (EDM) measurements of deuterons and protons at COSY-Jülich. A high accuracy RF Wien filter, operating at the spin harmonic frequencies is planned to be integrated in the COSY ring at the Forschungszentrum Jülich. This RF Wien filter is intended for spin tune modulation purposes allowing to perform EDM measurements. Because of the...Go to contribution page
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Izabela Ciepal (Institute of Nuclear Physics PAS)15/09/2015, 15:00TalkA large set of high precision vector and tensor analyzing power data of $^{1}H(\vec{d},pp)n$ breakup reaction was obtained at energies of 100 and 130 MeV [1-3]. The polarized deuteron beams were produced with the use of the ion sources of the AGOR (KVI Groningen, The Netherlands) and COSY (IKP FZ-Juelich, Germany) accelerators. The deuteron breakup in collision with proton, leading to...Go to contribution page
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Ohta Takeshi15/09/2015, 16:00Polarization target for using hadron experiment is developing and studying in RCNP, Osaka University. LEPS group have studied hadron photo-production experiment of the \phi, K, \eta, and \pi^0 mesons by using linear polarized Back Scattering Compton (BCS) \gamma-ray and no polarized target with energies of E\gamma=1.5 ∼ 2.9 GeV. An experiment for measuring a complete set of spin observables is...Go to contribution page
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Stefan Runkel (Universität Bonn)15/09/2015, 16:25The polarized target group at Bonn operates a dilution refrigerator for double polarization experiments at the Crystal Barrel in Bonn. To get high target polarizations and long relaxation times low temperatures are indispensable. To reach temperatures below 30 mK and to allow for the use of an internal polarization magnet, the polarized target group is building a new continuous mode dilution...Go to contribution page
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4. Polarisation and relaxation characteristics of irradiated polmeric materials at 1 K and at 2.5 T.Scott Reeve (Universität Bonn)15/09/2015, 16:50The dynamic polarisation of nuclear spins requires the introduction of paramagnetic centres into potential target materials. A method of choice is the irradiation of such materials, in particular the inorganic materials lithium hydride and ammonia have been used in many nuclear and particle physics experiments with much success. As established as these materials are, a solid target material...Go to contribution page
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LI WANG (Donghua University)15/09/2015, 17:15The Dynamic Nuclear Polarization (DNP) is an efficient technique to enhance the nucleus polarization by the so-called ´Radiation doping´ or ´Radical chemically doping´ methods in the field of polarized solid targets for their use in nuclear and particle physics experiments $^1$. Polymer materials have been used since 1994 due to the advantage of its easy handling at room temperature and shape...Go to contribution page
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Jonas Herick (RUB)15/09/2015, 17:40In the research field of polarized target physics the Q-meter is a well established technique to determine the polarization and relaxation behavior of a polarized solid target. One of the most common Q-meter modules is represented by the so called Liverpool-NMR, which was originally developed for the EMC experiment in the 1970s. However, since the module was build nearly 40 years ago, many...Go to contribution page
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Matt Poelker (Jefferson Lab)16/09/2015, 09:00New initiatives at Jefferson Lab require photoguns operating at 350 kV bias voltage. These initiatives include the construction of a compact 10 MeV electron accelerator for commissioning new hardware destined for CEBAF, including the polarized target HDIce. Proposed experiments such as DarkLight will benefit from the installation of a 350 kV load-locked gun at the Jefferson Lab energy...Go to contribution page
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James Maxwell (MIT)16/09/2015, 09:30TalkThe addition of a polarized neutron beam source to the Relativistic Heavy Ion Collider at Brookhaven National Laboratory would present promising opportunities for the study of nucleon structure. Polarized neutron collision measurements of transverse spin asymmetries in Drell-Yan scattering would allow a search of the predicted sign switch for u and d quark flavors in the Sivers function. In a...Go to contribution page
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Anatoli Zelenski (BNL)16/09/2015, 10:00
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Maik Biroth (Institut für Kernphysik, Mainz, Germany)16/09/2015, 11:00TalkName: Maik Biroth for the A2-Collaboration Affiliation: Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Germany Title: Design of the Mainz Active Polarized Target Abstract: At the Institut für Kernphysik in Mainz, Germany, the A2-Collaboration investigates the spin-polarizabilities of the proton by scattering experiments with spin-polarized energy-tagged photons. Due...Go to contribution page
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Jaakko Henrik Koivuniemi (Ruhr-Universitaet Bochum (DE))16/09/2015, 11:30TalkIn the COMPASS Drell-Yan programme a negative hadron beam (97% π − , 2.5% K − and 0.5% p) with momentum 190 GeV/c is used. The beam intensity reaches up to 10$^8$ particles/s. The polarizable solid state NH3 target is placed inside the mixing chamber of a large horizontal helium-3/4 dilution cryostat. A large acceptance superconducting solenoid magnet with nominal field of 2.5 T is used...Go to contribution page
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Dustin Keller (University of Virginia)16/09/2015, 12:00TalkA discussion of achieving tensor polarization optimization of a spin 1 solid target to be used in scattering experiments is presented. Manipulation of the deuteron NMR line with selective RF semi-saturation at a temperature of 1 K and holding field of 5 T are discussed. Some measurement techniques with error estimation are outlined. Techniques in increasing the deuteron tensor polarization...Go to contribution page
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Dr Yury Usov (JINR)17/09/2015, 09:00TalkA frozen spin polarized targets cooled by the $^3$He/$^4$He dilution refrigerator developed at Dubna are described. Experience with continuously dynamic polarized target and achieving of very low temperatures in 1966 (JINR) gave rise to the idea of using radically new technique based on dissolving $^3$He in $^4$He in the frozen--spin polarized target. The short history (1976-2015) of the...Go to contribution page
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Josh Pierce (ORNL)17/09/2015, 09:30TalkNeutron scattering off of protein crystals has been used successfully to determine protein structure. This technique achieves its best results when used with large crystal samples, or with samples that are amenable to techniques such as deuteration. In the case of small or delicate protein crystals, sample polarization has been identified as a method to greatly increase the signal to noise...Go to contribution page
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Ms Farah for the A2-Collaboration Afzal (HISKP, University of Bonn)17/09/2015, 10:00TalkThe understanding of the nucleon excitation spectra requires the measurement of several polarization observables in addition to the unpolarized cross section. The Crystal Ball experiment at MAMI has measured for the first time the double polarization observables E and G simultaneously within one beam time. The simultaneous production of linearly (needed for G) and circularly (needed for E)...Go to contribution page
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Jorg Pretz (Rheinisch-Westfaelische Tech. Hoch. (DE))17/09/2015, 11:00TalkPermanent EDMs (electric dipole moment) of fundamental particles violate both time invariance T and parity P. Assuming the CPT theorem this implies CP violation. The Standard Model predicts non-vanishing EDMs, their magnitudes, however, are expected to be unobservably small with current techniques. Hence, the discovery of a non-zero EDM would be a signal for "new physics". As a first step...Go to contribution page
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Annika Thiel (University of Bonn)17/09/2015, 11:45In order to understand the dynamics inside the nucleons, their excitation spectrum needs to be measured and compared to theoretical models like constituent quark models or recent lattice calculations. Since the excitation spectrum consists of several strongly overlapping resonances, these resonances are difficult to disentangle and identify. To determine their exact contributions, a...Go to contribution page
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Werner Peter Meyer (Institut fuer Experimentalphysik I)17/09/2015, 14:00Polarized Targets
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Prof. Tom Wenckebach (Paul Scherrer Institute, CH-5232 Villigen)17/09/2015, 14:15TalkDynamic Nuclear Polarization (DNP) uses microwave power to transfer the -- high -- polarization of electron spins to nuclear spins. To speed up this transfer, it is often attractive to increase the microwave power, i.e., increase the strength of the microwave field. This talk discusses how one passes through different regimes when doing so. At low power the solid effect and thermal mixing...Go to contribution page
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Dr Patrick Hautle (Paul Scherrer Institute, CH-5232 Villigen)17/09/2015, 14:45TalkIn DNP experiments the high polarization of an electronic spin system is transferred by suitable microwave irradiation to the nuclear spin system. In usual classical schemes ground state paramagnetic centers are introduced into the sample as dopants and their electron spin polarization is determined thermally. This requires temperatures of 1K or lower and a magnetic field of several Tesla. As...Go to contribution page
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Hartmut Dutz (Universität Bonn)17/09/2015, 15:45TalkSince the early sixties until today the main research program at the accelerator facilities of the Bonn University is devoted to photo- and electroproduction of mesons in the resonance region. In this context the measurement of polarization observables played and still play a key role to determine the various multipoles to describe the production processes of the nucleon resonances. Starting...Go to contribution page
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Dr Stefan Goertz (Physics Institute, University Bonn)17/09/2015, 16:15TalkThere is a long tradition on Polarized Solid Targets at the Bonn university starting already in the late 1960s with first target asymmetry experiments at the former Bonn 2.5 GeV synchrotron done by Wolfgang Paul, Karl-Heinz Althoff and coworkers. An early milestone set in the field of polarizable solid target materials was the invention of irradiated d-ammonia in the early 1980s by Werner...Go to contribution page
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Prof. Jan Henrik Ardenkjear-Larsen17/09/2015, 16:45Talk
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Prof. Naoaki Horikawa (Chubu University)17/09/2015, 17:15TalkA long history of the collaborating research on polarization phenomena, in particular, on the development of Polarized Solid Target between Japan and Germany exists. The collaboration started in late 1960s between Bonn and Nagoya universities and lasts even now still successfully, changing the physics subjects and responsible universities. The contents of the collaboration like physics...Go to contribution page
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Marcel Bornstein (Universität Bonn)18/09/2015, 09:00In order to improve the figure of merit of double-polarisation experiments at CB-ELSA in Bonn, the Polarised Target is working on a new dilution refrigerator. For maximum polarisation of nucleons low temperatures and a high homogeneous magnetic field within the target area is needed. A thin, superconducting magnet is in development, which will create a continuous longitudinal magnetic field...Go to contribution page
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Dr Alexander Smirnov (Joint Institute for Nuclear Research), Dr Yury Plis (JINR)18/09/2015, 09:30TalkOn the feasibility of using an extracted polarized antiproton beam of the HESR with a solid polarized target Yu.A. Plis, A.V. Smirnov et al. Joint Institute for Nuclear Research, 141980 Dubna, Russia It seems real to accelerate and store polarized antiprotons in the high-energy storage ring (HESR) at FAIR. We accept that all the problems connected with production...Go to contribution page
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Dr Victor Fimushkin (JINR,Dubna)18/09/2015, 10:00TalkThe project assumes the design and construction of a universal high-intensity source of polarized deuterons (protons) using a charge-exchange plasma ionizer. The output ↑D+ (↑H+) current of the source is expected to be at a level of 10 mA. The polarization will be up to 90% of the maximal vector (±1) for ↑D+ (↑H+) and tensor (+1, -2) for ↑D+ polarization. Realization of the project is carried...Go to contribution page
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Prof. Masayoshi Tanaka (Kobe Tokiwa University)18/09/2015, 11:00TalkPolarized ion sources and targets have been developed at RCNP, Osaka University. Based on this experience, we started the project of hyperpolarized nuclei for medical imaging with 3He and 19F by the brute force and PHIP (Parahydrogen Induced Polarization) methods, respectively [1]. Here, the latest development on the 3He hyperpolarization is presented, whereas the other parts will also be...Go to contribution page
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Dr Ralf Engels (Institut für Kernphysik, Forschungszentrum Jülich, Wilhelm-Johnen-Str. 1, 52428 Jülich, Germany)18/09/2015, 11:30TalkIn the last two decades the intensity of polarized atomic beam sources sticks at about $10^{17}$ polarized atoms/s. Therefore, even the areal density of internal storage-cell targets for experiments like ANKE/COSY or PAX/COSY could not exceed $10^{14}$ atoms/cm$^2$. Even the use of openable storage cells or cooling of the cell walls could not help to overcome this limit. One possible option to...Go to contribution page
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Mr Ilhan Engin (Forschungszentrum Jülich)18/09/2015, 12:00Polarized $^3$He is of particular importance for fundamental research since the spins of the two protons are oriented anti-parallel so that the nuclear spin is basically carried by the unpaired neutron. That is why polarized $^3$He $^1$ can be used, for example, as an effective polarized neutron target for studying the neutron structure by scattering with polarized electrons $^2$. For many...Go to contribution page
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Dr Matt Poelker (Jefferson Lab)18/09/2015, 12:30
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