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Polarized proton beams in RHIC

Description: The polarized beam for RHIC is produced in the optically-pumped polarized H{sup -} ion source and then accelerated in Linac to 200 MeV for strip-injection to Booster and further accelerated 24.3 GeV in AGS for injection in RHIC. In 2009 Run polarized protons was successfully accelerated to 250 GeV beam energy. The beam polarization of about 60% at 100 GeV beam energy and 36-42% at 250 GeV beam energy was measured with the H-jet and p-Carbon CNI polarimeters. The gluon contribution to the proton… more
Date: October 4, 2010
Creator: Zelenski, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Polarized Ion Sources For High Energy Accelerators And Colliders

Description: The recent progress in polarized ion source development is reviewed. In dc operation a 1.0 mA polarized H{sup -} ion current is now available from the Optically-Pumped Polarized Ion Source (OPPIS) . In pulsed operation a 10 mA polarized H{sup -} ion current was demonstrated at the TRIUMF pulsed OPPIS test bench and a 3.5 mA peak current was obtained from an Atomic Beam Source (ABS) at the INR Moscow test bench. The possibilities for future improvements with both techniques are discussed. A new … more
Date: October 16, 2000
Creator: Zelenski, A. N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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POLARIZED ION SOURCES FOR HIGH ENERGY ACCELERATORS AND COLLIDERS

Description: The recent progress in polarized ion source development is reviewed. In dc operation a 1.0 mA polarized H{sup -} ion current is now available from the Optically-Pumped Polarized Ion Source (OPPIS). In pulsed operation a 10 mA polarized H{sup -} ion current was demonstrated at the TRIUMF pulsed OPPIS test bench and a 3.5 mA peak current was obtained from an Atomic Beam Source (ABS) at the INR Moscow test bench. The possibilities for future improvements with both techniques are discussed. A new O… more
Date: October 16, 2000
Creator: Zelenski, A. N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Optically pumped polarized ion sources

Description: Polarization transfer collisions between protons, atomic hydrogen, or deuterium and optically pumped alkali-metal vapour are implemented in the high current optically pumped polarized ion source (OPPIS) and the laser driven source (LDS) of nuclear polarized atoms for target applications. The OPPIS technique overcomes the limitations on intensity of the conventional atomic beam source technique and meets the requirements of the new generation of polarization experiments at multi-GeV accelerators… more
Date: December 31, 1995
Creator: Zelenski, A. N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The RHIC Optically-Pumped Polarized H Ion Source.

Description: The depolarization factors in the multi-step spin-transfer polarization technique and basic limitations on maximum polarization in the OPPIS (Optically-Pumped Polarized H{sup -} Ion Source) are discussed. Detailed studies of polarization losses in the RHIC OPPIS and the source parameters optimization resulted in the OPPIS polarization increase to 86-90%. This contributed to increasing polarization in the AGS and RHIC to 65-70%.
Date: September 10, 2007
Creator: Zelenski,A.; Zelenski, A.; Kokhanovski, S.; Kponou, A.; Ritter, J. & Zubets, V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Sona transition studies in the RHIC OPPIS.

Description: In Optically Pumped Polarized Ion Sources (OPPIS), the atomic beam is first electron polarized, and then this polarization is transferred to the nucleus by a suitable perturbing magnetic field. In the BNL OPPIS, the electron polarized atomic beam experiences the perturbing field when it traverses a region where the axial magnetic field reverses direction in a controlled manner, strength and gradient. This is the so-called Sona Transition region, named after P. G. Sona, who fist suggested the te… more
Date: September 10, 2007
Creator: Kponou,A.; Zelenski, A.; Kokhanovski, S. & Zubets, V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Production of high brightness H- beam by charge exchange of hydrogen atom beam in sodium jet

Description: Production of H{sup -} beam for accelerators applications by charge exchange of high brightness hydrogen neutral beam in a sodium jet cell is experimentally studied in joint BNL-BINP experiment. In the experiment, a hydrogen-neutral beam with 3-6 keV energy, equivalent current up to 5 A and 200 microsecond pulse duration is used. The atomic beam is produced by charge exchange of a proton beam in a pulsed hydrogen target. Formation of the proton beam is performed in an ion source by four-electro… more
Date: November 16, 2010
Creator: Davydenko, V.; Zelenski, A.; Ivanov, A. & Kolmogorov, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Luminescence Beam Profile Monitor for the RHIC Polarized Hydrogen Jet Polarimeter.

Description: A new polarized hydrogen jet target was used to provide improved beam polarization measurements during the second polarized proton m in the Relativistic Heavy Ion Collider (RHIC). The luminescence produced by beam-hydrogen excitations was also used to test the feasibility of a new beam profile monitor for RFPIC based on the detection of the emitted light. Lenses, a view-port and a sensitive CCD camera were added to the system to record the optical signals from the interaction chamber. The first… more
Date: May 16, 2005
Creator: Luciano, N.; Nass, A.; Makdisi, Y.; Thieberger, P.; Trbojevic, D. & Zelenski, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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High-intensity polarized H-(proton), deuteron and 3He++ion source development at BNL.

Description: New techniques for the production of polarized electron, H{sup -} (proton), D (D+) and {sup 3}H{sup ++} ion beams are discussed. Feasibility studies of these techniques are in progress at BNL. An Optically Pumped Polarized H{sup -} Ion Source (OPPIS) delivers beam for polarization studies in RHIC. The polarized deuteron beam will be required for the deuteron Electron Dipole Moment (EDM) experiment, and the {sup 3}H{sup ++} ion beam is a part of the experimental program for the future eRHIC (Ele… more
Date: June 23, 2008
Creator: Zelenski,A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A P + Deuteron Proton Polarimeter at 200 MEV

Description: There has been concern about the analyzing power of the p-Carbon polarimeter at the end of 200 MeV LINAC of BNL. A new polarimeter based on proton-deuteron scattering was installed and we have repeated the calibration of proton-Carbon scattering at 12 degrees and 200 MeV against proton-deuteron scattering. The result is consistent with the value of A=0.62 now used to measure the beam polarization at the end of the LINAC.
Date: June 2, 2002
Creator: Huang, H.; Roser, T.; Zelenski, A.; Kurita, K.; Stephenson, E. & Toole, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Ionization of polarized 3He+ ions in EBIS trap with slanted electrostatic mirror.

Description: Methods of producing the nuclear polarized {sup 3}He{sup +} ions and their ionization to {sup 3}H{sup ++} in ion trap of the electron Beam Ion Source (EBIS) are discussed. Computer simulations show that injection and accumulation of {sup 3}He{sup +} ions in the EBIS trap with slanted electrostatic mirror can be very effective for injection times longer than the ion traversal time through the trap.
Date: September 10, 2007
Creator: Pikin, A.; Zelenski, A.; Kponou, A.; Alessi, J.; Beebe, E.; Prelee, K. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Opportunities for Polarized He-3 in RHIC and EIC

Description: The workshop on opportunities for polarized He-3 in RHIC and EIC was targeted at finding practical ways of implementing and using polarized He-3 beams. Polarized He-3 beams will provide the unique opportunity for first measurements, i.e, to a full quark flavor separation measuring single spin asymmetries for p{sup +}, p{sup -} and p{sup 0} in hadron-hadron collisions. In electron ion collisions the combination of data recorded with polarized electron proton/He-3 beams allows to determine the qu… more
Date: October 1, 2011
Creator: E., Aschenauer; Deshpande, A.; Fischer, W.; Derbenev, S.; Milner, R.; Roser, T. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The RHIC polarized source upgrade

Description: The RHIC polarized H{sup -} ion source is being upgraded to higher intensity (5-10 mA) and polarization for use in the RHIC polarization physics program at enhanced luminosity RHIC operation. The higher beam peak intensity will allow reduction of the transverse beam emittance at injection to AGS to reduce polarization losses in AGS. There is also a planned RHIC luminosity upgrade by using the electron beam lens to compensate the beam-beam interaction at collision points. This upgrade is also es… more
Date: September 27, 2010
Creator: Zelenski, A.; Atoian, G.; Davydenko, V.; Ivanov, A.; Kolmogorov, A.; Ritter, J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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High-intensity, high-brightness polarized and unpolarized beam production in charge-exchange collisions

Description: Basic limitations on the high-intensity H{sup -} ion beam production were experimentally studied in charge-exchange collisions of the neutral atomic hydrogen beam in the Na-vapour jet ionizer cell. These studies are the part of the polarized source upgrade (to 10 mA peak current and 85% polarization) project for RHIC. In the source the atomic hydrogen beam of a 5-10 keV energy and total (equivalent) current up to 5 A is produced by neutralization of proton beam in pulsed hydrogen gas target. Fo… more
Date: March 28, 2011
Creator: Zelenski, A.; Ritter, J.; Zubets, V.; Steski, D.; Atoian, G.; Davydenko, V. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A new luminescence beam profile monitor for intense proton and heavy ion beams

Description: A new luminescence beam profile monitor is realized in the polarized hydrogen gas jet target at the Relativistic Heavy Ion Collider (RHIC) facility. In addition to the spin polarization of the proton beam being routinely measured by the hydrogen gas jet, the luminescence produced by beam-hydrogen excitation leads to a strong Balmer series lines emission. A selected hydrogen Balmer line is spectrally filtered and imaged to produce the transverse RHIC proton beam shape with unprecedented details … more
Date: October 1, 2008
Creator: Tsang, T.; Bellavia, S.; Connolly, R.; Gassner, D.; Makdisi, Y.; Russo, T. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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ATOMIC BEAM STUDIES IN THE RHIC H-JET POLARIMETER.

Description: The results of atomic beam production studies are presented. Improved cooling of the atoms before jet formation in the dissociator cold nozzle apparently reduces the atomic beam velocity spread and improves beam focusing conditions. A carefully designed sextupole separating (and focusing) magnet system takes advantage of the high brightness source. As a result a record beam intensity of a 12.4 {center_dot} 10{sup 16} atoms/s was obtained within 10 mm acceptance at the collision point. The resul… more
Date: January 28, 2005
Creator: Makdisi, Y.; Zelenski, A.; Graham, D.; Kokhanovski, S.; Mahler, G.; Nass, A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Studies and proposed changes to the RHIC p-Carbon polarimeters for the upcoming RUN-11

Description: The RHIC polarized proton complex utilizes polarimeters in each of the Blue and Yellow beams that measure the beam polarization through the p-Carbon elastic scattering process in the Coulomb Nuclear Interference kinematic region. This along with a Polarized Hydrogen Jet Target that utilizes the proton-proton elastic scattering process to first measure the analyzing power of the reaction and using the reverse process to measure the beam polarization. The latter is used to calibrate the p-Carbon … more
Date: September 27, 2010
Creator: Makdisi, Y.; Alekseev, I.; Aschenauer, E.; Atoian, G.; Bazilevsky, A.; Gill, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Run-09 pC polarimeter analysis

Description: Analysis of PC polarimeter data at {radical}s = 200 and 500 GeV from Run9 is presented. Final polarization results, fill-by-fill, for blue and yellow beams, as to be used by RHIC experiments (in collisions) are released and collected in http://www4.rcf.bnl.gov/cnipol/pubdocs/Run09Offline/. Global relative systematic uncertainties {delta}P/P (to be considered as correlated from fill to fill) are 4.7% for 100 GeV beams, and 8.3% (12.1%) for blue (yellow) 250 GeV beams. For a product of two beam p… more
Date: August 1, 2010
Creator: Alekseev, I.; Aschenauer, E.; Atoyan, G.; Bazilevsky, A.; Gill, R.; Huang, H. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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