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
Mei Bai
(Forschungszentrum GmbH)
14/09/2015, 10:30
Talk
Ever 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...
Dr
Edward Stephenson
(Indiana University)
14/09/2015, 11:00
Talk
This 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...
Christopher Keith
(Jefferson Lab)
14/09/2015, 11:30
Talk
For 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.
Dr
Oleg Eyser
(Brookhaven National Laboratory)
14/09/2015, 14:00
Talk
The 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...
Anatoli Zelenski
(BNL)
14/09/2015, 14:30
Polarized 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.
Dr
Grant Webb
(Brookhaven National Laboratory)
14/09/2015, 15:00
Talk
Polarization 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...
Matthias Molitor
(Johannes Gutenberg-Universität Mainz)
14/09/2015, 16:25
Talk
The 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...
Andrei Poblaguev
(Brookhaven National Laboratory (US))
14/09/2015, 16:50
Talk
In 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...
Fabian Nillius
(Uni Mainz)
14/09/2015, 17:30
Atomic 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...
Jean-Philippe Lansberg
(IPN Orsay, Paris Sud U. / IN2P3-CNRS)
15/09/2015, 09:00
Talk
In 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...
Dr
Erhard Steffens
(Univ. of Erlangen-Nürnberg)
15/09/2015, 09:30
Talk
A 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...
Norihiro Doshita
(Yamagata University (JP))
15/09/2015, 10:00
Talk
The 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...
Dr
Irakli Keshelashvili
(Forschungszentrum Jülich GmbH)
15/09/2015, 11:00
Talk
In 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...
Mr
Nils Hempelmann
(Forschungszentrum Jülich GmbH)
15/09/2015, 11:30
Talk
The 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...
Joshua Magee
(College of William and Mary)
15/09/2015, 12:00
Talk
Modern 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...
Sebastian Mey
(Forschungszentrum Jülich GmbH)
15/09/2015, 14:00
Talk
The 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...
Jamal Slim
(RWTH Aachen)
15/09/2015, 14:30
Talk
The 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...
Izabela Ciepal
(Institute of Nuclear Physics PAS)
15/09/2015, 15:00
Talk
A 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...
Stefan Runkel
(Universität Bonn)
15/09/2015, 16:25
The 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...
4.
Polarisation and relaxation characteristics of irradiated polmeric materials at 1 K and at 2.5 T.
Scott Reeve
(Universität Bonn)
15/09/2015, 16:50
The 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...
LI WANG
(Donghua University)
15/09/2015, 17:15
The 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...
Matt Poelker
(Jefferson Lab)
16/09/2015, 09:00
New 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...
Anatoli Zelenski
(BNL)
16/09/2015, 10:00
Maik Biroth
(Institut für Kernphysik, Mainz, Germany)
16/09/2015, 11:00
Talk
Name: 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...
Jaakko Henrik Koivuniemi
(Ruhr-Universitaet Bochum (DE))
16/09/2015, 11:30
Talk
In 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...
Dustin Keller
(University of Virginia)
16/09/2015, 12:00
Talk
A 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...
Ms
Farah for the A2-Collaboration Afzal
(HISKP, University of Bonn)
17/09/2015, 10:00
Talk
The 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)...
Jorg Pretz
(Rheinisch-Westfaelische Tech. Hoch. (DE))
17/09/2015, 11:00
Talk
Permanent 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...
Annika Thiel
(University of Bonn)
17/09/2015, 11:45
In 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...
Werner Peter Meyer
(Institut fuer Experimentalphysik I)
17/09/2015, 14:00
Polarized Targets
Prof.
Tom Wenckebach
(Paul Scherrer Institute, CH-5232 Villigen)
17/09/2015, 14:15
Talk
Dynamic 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...
Dr
Patrick Hautle
(Paul Scherrer Institute, CH-5232 Villigen)
17/09/2015, 14:45
Talk
In 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...
Hartmut Dutz
(Universität Bonn)
17/09/2015, 15:45
Talk
Since 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...
Dr
Stefan Goertz
(Physics Institute, University Bonn)
17/09/2015, 16:15
Talk
There 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...
Prof.
Jan Henrik Ardenkjear-Larsen
17/09/2015, 16:45
Talk
Prof.
Naoaki Horikawa
(Chubu University)
17/09/2015, 17:15
Talk
A 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...
Marcel Bornstein
(Universität Bonn)
18/09/2015, 09:00
In 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...
Dr
Alexander Smirnov
(Joint Institute for Nuclear Research), Dr
Yury Plis
(JINR)
18/09/2015, 09:30
Talk
On 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...
Dr
Victor Fimushkin
(JINR,Dubna)
18/09/2015, 10:00
Talk
The 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...
Prof.
Masayoshi Tanaka
(Kobe Tokiwa University)
18/09/2015, 11:00
Talk
Polarized 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...
Dr
Ralf Engels
(Institut für Kernphysik, Forschungszentrum Jülich, Wilhelm-Johnen-Str. 1, 52428 Jülich, Germany)
18/09/2015, 11:30
Talk
In 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...
Mr
Ilhan Engin
(Forschungszentrum Jülich)
18/09/2015, 12:00
Polarized $^3$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...
