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Proceedings of XVII International Workshop on Polarized Sources, Targets & Polarimetry — PoS(PSTP2017)最新文献

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Production of a polarizable target using mechanical doping method and trial of dynamic nuclear polarization 机械掺杂法制备极化靶及动态核极化试验
D. Miura, T. Iwata, Y. Miyachi, G. Nukazuka, D. Kaneko
Dynamic Nuclear Polarization (DNP) which is often employed for polarized solid targets, needs free electron doping to transfer high electron polarization to target nuclei. A newly proposed “mechanical-doping” method was applied in preparation of a polarized target material. A solid material having been crushed into small particles with a diameter of about 20 nm, is mixed with a free radical. This allows target nuclei to have more chance to interact with the free electrons or polarized nuclei surrounding the small particles. A first DNP test at a magnetic field of 2.5 T and a temperature of 0.9 K was performed with a sample of LaF_{3} processed in the mechanical-doping method to introduce a free radical TEMPO dispersed in ethanol. ^{19}F polarizations of 3.3 % and -2.7 % were achieved. The obtained polarization enhancement for ^{19}F demonstrated effectiveness of the new method.
动态核极化(DNP)通常用于极化固体靶,需要自由电子掺杂将高电子极化转移到靶核。采用一种新提出的“机械掺杂”方法制备了极化靶材料。一种固体物质被粉碎成直径约20纳米的小颗粒,与自由基混合。这使得目标原子核有更多的机会与小粒子周围的自由电子或极化原子核相互作用。采用机械掺杂法制备的LaF_{3}样品,引入分散在乙醇中的自由基TEMPO,在2.5 T磁场和0.9 K温度下进行了第一次DNP测试。^{19}极化率分别为3.3%和- 2.7%。得到的^{19}F的偏振增强证明了新方法的有效性。
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引用次数: 0
Development of closed -cycle dynamic nuclear polarization system for small -angle neutron scattering and neutron reflectometry 用于小角中子散射和中子反射测量的闭周期动态核极化系统的研制
T. Kumada, K. Akutsu, K. Ohishi, Y. Kawamura, T. Morikawa, M. Sahara, J. Suzuki, N. Torikai
We develop a closed-cycle dynamic nuclear polarization (DNP) system for spin-contrast-variation (SCV) small-angle neutron scattering (SANS) and neutron reflectometry (NR) to increase the use of these techniques. Compared with our cryogen-filled DNP system, the closed-cycle system is made compact and can change the sample in a comparable time-scale, but achieved proton-polarization is only 11.2 and 20$pm$3% for bulk and thin-film samples, respectively, whereas 32-37% is achieved with the cryogen-filled system. This is because cooling power of the recycling cold helium gas in the closed-cycle system is lower than that of superfluid helium in the cryogen-filled one. In order to improve the polarization with the closed-cycle system, we have to improve thermal contact between the sample and cold helium gas to minimize microwave heating of the sample.
我们开发了一个封闭循环动态核极化(DNP)系统,用于自旋-对比-变化(SCV)小角中子散射(SANS)和中子反射(NR),以增加这些技术的使用。与我们的低温填充DNP系统相比,封闭循环系统结构紧凑,可以在相当的时间尺度内改变样品,但在本体和薄膜样品中分别实现了11.2和20$pm$3%的质子极化,而在低温填充系统中实现了32-37%。这是因为封闭循环系统中循环冷氦的冷却功率低于充冷系统中超流氦的冷却功率。为了改善闭循环系统的极化,我们必须改善样品与冷氦气之间的热接触,以减少样品的微波加热。
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引用次数: 0
Axion dark matter search with the storage ring EDM method 用存储环EDM方法搜索轴子暗物质
Seungpyo Chang, S. Haciomeroglu, O. Kim, Soohyung Lee, Seongtae Park, Y. Semertzidis
We propose using a modified storage ring EDM method to search for the axion dark matter induced EDM oscillation in nucleons. The method uses a combination of B and E-fields to produce a resonance between the $g-2$ precession frequency and the background axion field oscillation to greatly enhance the sensitivity to it. An axion frequency range of 100Hz to 100MHz can be scanned with large sensitivity, corresponding to $f_a$ range of $10^{13} $ GeV $leq f_a leq 10^{19}$ GeV the breakdown scale of the global symmetry generating the axion or axion like particles (ALPs).
我们提出了一种改进的存储环EDM方法来寻找轴子暗物质在核子中引起的EDM振荡。该方法利用B场和e场的组合使$g-2$进动频率与背景轴场振荡产生共振,大大提高了对其的灵敏度。在100Hz ~ 100MHz的频率范围内,可以进行高灵敏度的扫描,对应于$f_a$范围$10^{13} $ GeV $leq f_a leq 10^{19}$ GeV,这是产生轴子或类轴子粒子(ALPs)的全局对称的击穿尺度。
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引用次数: 6
LYSO modules for the JEDI polarimeter: production, laboratory tests and results of first measurements 用于JEDI偏振计的LYSO模块:生产、实验室测试和首次测量的结果
D. Shergelashvili
The JEDI collaboration aims to search for the electric dipole moment (EDM) for the protons and deuterons in the storage ring (srEDM). One of the main components of the srEDM experimental set-up is the polarimeter to observe the slow buildup of vertical polarization. In our concept, the polarimeter is based on inorganic novel LYSO crystals and low voltage silicon photomultipliers (SiPM). Up to now, more than 30 modules have been assembled in different configurations. They have first been tested in the laboratory with internal and external radiation sources and subsequently, they have been exposed to the experimental environment with accelerator beams. We have performed three test beam times at several different beam energies. The results of the measurements and accumulated experience of the module production will be presented.
JEDI合作旨在寻找存储环(srEDM)中质子和氘核的电偶极矩(EDM)。srEDM实验装置的主要组成部分之一是偏振计,用于观察垂直偏振的缓慢形成。在我们的概念中,偏振计是基于无机的新型LYSO晶体和低压硅光电倍增管(SiPM)。到目前为止,已经组装了30多个不同配置的模块。它们首先在实验室用内部和外部辐射源进行测试,随后,它们被暴露在加速器束的实验环境中。我们在几种不同的光束能量下进行了三次测试。将介绍测量结果和模块生产中积累的经验。
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引用次数: 2
Preface to PSTP 2017 Proceedings PSTP 2017论文集前言
Seo-Jung Park
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引用次数: 0
Resonant (Longitudinal and Transverse) Electron Polarimetry 共振(纵向和横向)电子偏振法
R. Talman, B. Roberts, J. Grames, A. Hofler, R. Kazimi, M. Poelker, R. Suleiman
Experiments are proposed to measure (first longitudinal, then, later, using Stern-Gerlach (SG) deflection, transverse) polarization of an electron beam by measuring the excitation induced in a resonant cavity. With ideal resonator construction and positioning there would be no resonator excitation caused directly by the beam charge. But, because the electron charge is so large relative to its magnetic moment, special beam preparation and polarization modulation are required to suppress this background. Signal levels and foreground to background ratios are calculated.
提出了通过测量谐振腔中激发的电子束的偏振(首先是纵向的,然后是利用施特恩-格拉赫(SG)偏转,横向的)的实验。在理想的谐振腔结构和位置下,光束电荷不会直接引起谐振腔激发。但是,由于电子电荷相对于它的磁矩是如此之大,需要特殊的光束制备和偏振调制来抑制这种背景。计算信号电平和前景背景比。
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引用次数: 1
The HJET polarimeter in RHIC Run 2017 2017年RHIC Run中的HJET偏振计
A. Poblaguev, E. Aschenauer, G. Atoian, K. O. Eyser, H. Huang, Y. Makdisi, W. Schmidke, A. Zelenski, I. Alekseev, D. Svirida
The Polarized Atomic Hydrogen Jet Target (HJET) Polarimeter commissioned in 2004 was designed to measure absolute polarization of proton beams in Relativistic Heavy Ion Collider (RHIC). HJET performance in RHIC Run 2017 (255 GeV proton beams) will be discussed. The long term (1-100 days) stability of the measured effective analyzing power $langle A_Nrangle$ was found to be $sqrt{langle(deltasigma^mathrm{syst}_{A_N})^2rangle}/A_Nle0.1%$. The systematic error in measurement of the RHIC beam average polarization of $Psim56%$ was evaluated to be $sigma_P^mathrm{syst}/Plesssim0.5%$. The statistical error in such a measurement is defined by the number of detected $p^uparrow p^uparrow$ elastic events and for an 8 hours RHIC store it was typically at $sigma_P^mathrm{stat}approx2%$. The elastic events statistics of about $10^9$ per RHIC beam accumulated during Run 2017 allowed us to make a detailed study of the proton-proton single-spin $A_N (t)$ and double-spin $A_{NN}(t)$ analyzing powers in the momentum transfer range $0.001<-t<0.020~(mathrm{GeV}⁄c)^2$. Contributions of the hadronic single $r_5$ and double $r_2$ spin-flip amplitudes were isolated. Analysis of the inelastic background $p_mathrm{beam}^uparrow+p_mathrm{target}^uparrowrightarrow X+p_mathrm{target}$ allowed us to experimentally evaluate the beam and target spin correlated asymmetries in these processes for $M_X-m_plesssim400 mathrm{MeV}$ and $tsim-0.005 (mathrm{GeV}⁄c)^2$. The data acquired during 3 weeks of Gold-Gold beams in RHIC allowed us to make a high statistics measurement of the $p^uparrowmathrm{Au}$ analyzing power at $E_text{Lab}=27.2$unit{}{GeV}.
2004年投入使用的极化原子氢喷射靶(HJET)偏振计是用于测量相对论重离子对撞机(RHIC)中质子束的绝对偏振。将讨论HJET在RHIC Run 2017 (255 GeV质子束)中的性能。所测有效分析功率$langle A_Nrangle$的长期(1-100天)稳定性为$sqrt{langle(deltasigma^mathrm{syst}_{A_N})^2rangle}/A_Nle0.1%$。测量$Psim56%$的RHIC光束平均偏振的系统误差为$sigma_P^mathrm{syst}/Plesssim0.5%$。这种测量的统计误差由检测到的$p^uparrow p^uparrow$弹性事件的数量来定义,对于8小时的RHIC存储,它通常在$sigma_P^mathrm{stat}approx2%$。Run 2017期间积累的每束RHIC中大约$10^9$的弹性事件统计数据使我们能够在动量传递范围$0.001<-t<0.020~(mathrm{GeV}⁄c)^2$内详细研究质子-质子单自旋$A_N (t)$和双自旋$A_{NN}(t)$的分析能力。强子单次$r_5$和双次$r_2$自旋翻转振幅的贡献是孤立的。对非弹性背景$p_mathrm{beam}^uparrow+p_mathrm{target}^uparrowrightarrow X+p_mathrm{target}$的分析使我们能够实验地评估$M_X-m_plesssim400 mathrm{MeV}$和$tsim-0.005 (mathrm{GeV}⁄c)^2$在这些过程中光束和目标自旋相关的不对称性。在RHIC中3周的Gold-Gold光束中获得的数据使我们能够对$E_text{Lab}=27.2$unit{}{GeV}的$p^uparrowmathrm{Au}$分析能力进行高统计测量。
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引用次数: 5
Status and Perspectives of the S-DALINAC Polarized-Electron Injector* S-DALINAC极化电子注入器的现状与展望*
M. Herbert, J. Enders, M. Espig, Y. Fritzsche, N. Kurichiyanil, M. Wagner
The S-DALINAC Polarized Injector (SPIN) uses GaAs photocathodes to provide pulsed and/or polarized electron beams for nuclear-structure investigations. Recently, a test facility for Photo-Cathode Activation, Test, and Cleaning using atomic-Hydrogen (Photo-CATCH) has been developed. This setup uses an inverted insulator geometry. Tests and optimizations are conducted at Photo-CATCH in order to implement the inverted design at SPIN. We will present the current status of Photo-CATCH, the planned upgrade of SPIn (aimed at an operational voltage of 200 kV) and future measurements. *Work supported by DFG (GRK 2128 “AccelencE”), BMBF (05H15RDRB1), and in part by the state of Hesse through the LOEWE center HIC for FAIR.
S-DALINAC极化注入器(SPIN)使用砷化镓光电阴极为核结构研究提供脉冲和/或极化电子束。近年来,研制了一种用于原子氢光阴极活化、测试和清洗的测试装置(Photo-CATCH)。这种设置使用了一个倒置的绝缘体几何形状。为了在SPIN上实现反向设计,在Photo-CATCH上进行了测试和优化。我们将介绍Photo-CATCH的现状,SPIn的计划升级(旨在达到200千伏的工作电压)和未来的测量。*由DFG (GRK 2128“AccelencE”),BMBF (05H15RDRB1)支持的工作,并通过LOEWE中心HIC for FAIR部分由黑森州支持。
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引用次数: 1
NMR Polarization Measurements for Jefferson Lab's Solid Polarized Targets 杰弗逊实验室固体极化靶的核磁共振极化测量
J. Maxwell
Solid polarized targets rely on Nuclear Magnetic Resonance techniques to provide accurate measurements of the enhanced polarization provided by Dynamic Nuclear Polarization. Upcoming polarized target experiments in Jefferson Lab's Hall B present challenging conditions which demand improvements to traditional NMR methods. We will discuss the changes prompted by the new Hall B target, lay out plans for improvements to our NMR system, and show results of initial tests of our designs.
固体极化靶依靠核磁共振技术来精确测量动态核极化所带来的增强极化。即将在杰斐逊实验室B厅进行的极化目标实验提出了具有挑战性的条件,需要改进传统的核磁共振方法。我们将讨论由新的B厅目标引起的变化,制定改进我们的核磁共振系统的计划,并展示我们设计的初步测试结果。
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引用次数: 0
AGS P-carbon CNI polarimeter Operation Experience 具有AGS P-carbon CNI偏振计操作经验
Haixin Huang, A. Poblaguev, D. Steski, K. Yip, A. Zelenski
The p-carbon polarimeter working in the dp/p Coulomb Nuclear Interference (CNI) region has been used in the Brookhaven Alternating Gradient Synchrotron (AGS ) for many years. It has gone though several upgrades to improve its performance. With targets sweeping through beam vertically and horizontally, the polarimeter can provide polarization profile information. To preserve polarization, a pair of horizontal tune jump quads have been used to overcome horizontal intrinsic resonances. Recently, the polarization measurement on the energy ramp has been used to decide the beam energy as function of time on the ramp. This paper summarize the recent operation experience of AGS p-carbon CNI polarimeter.
在布鲁克海文交变梯度同步加速器(AGS)中,工作于dp/p库仑核干涉(CNI)区的p-碳偏振计已使用多年。为了提高性能,它已经进行了几次升级。当目标垂直和水平扫过光束时,偏振计可以提供偏振剖面信息。为了保持极化,一对水平调谐跳变四元被用来克服水平固有共振。近年来,利用能量坡道上的偏振测量来确定光束能量随坡道上时间的函数。本文总结了近年来AGS p-碳CNI偏振仪的运行经验。
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引用次数: 0
期刊
Proceedings of XVII International Workshop on Polarized Sources, Targets & Polarimetry — PoS(PSTP2017)
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