Bulletin of the American Physical Society
2016 Fall Meeting of the APS Division of Nuclear Physics
Volume 61, Number 13
Thursday–Sunday, October 13–16, 2016; Vancouver, BC, Canada
Session KH: Mini-symposium on Instrumentation for Physics Beyond the Standard Model IIAMini-Symposium
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Chair: Adam Holley, Tennessee Technological University Room: Pavilion Ballroom C |
Saturday, October 15, 2016 2:00PM - 2:36PM |
KH.00001: Overview of Instrumentation for Beyond Standard Model Physics Invited Speaker: Takeyasu Ito There are a number of ongoing, planned, or proposed experiments in nuclear physics that are searching with ever increasing precision for physics beyond the standard model. These exciting experiments are enabled by advances in instrumentation, based on innovative ideas and/or technological progress. In this talk, an overview of recent advances in instrumentation in the search for physics beyond the standard model will be presented. [Preview Abstract] |
Saturday, October 15, 2016 2:36PM - 2:48PM |
KH.00002: Magnetic field component demonstration for a neutron electric dipole moment search Simon Slutsky A neutron electric dipole moment (EDM) search at the Oak Ridge National Laboratory's Spallation Neutron Source (SNS) will probe with a sensitivity of $< 5 \times 10^{-28}$ e-cm. Trapped, polarized ultracold neutrons will precess in a constant magnetic field and variable electric field, and a non-zero neutron EDM will appear as a variation in the precession frequency correlated with the electric field. Magnetic field gradients must be kept below 10 pT/cm to mitigate false EDMs produced by the geometric phase effect and to maximize the neutron spin-relaxation lifetime. I will discuss a prototype magnetic shielding system, including a nearly-hermetic superconducting lead shield, built to demonstrate the required gradients at $\sim$1/3-scale of the final experiment. Additionally, the system will evaluate the eddy current heating due to RF fields produced by a proposed neutron-``spin-dressing'' technique. [Preview Abstract] |
Saturday, October 15, 2016 2:48PM - 3:00PM |
KH.00003: UV Laser Development for Dual Species Co-Magnetometer using $^{129}$Xe and $^{199}$Hg Emily Altiere, Tomohiro Hayamizu, Eric Miller, Joshua Wienands, Kirk Madison, Takamasa Momose, David Jones The new ultracold neutron (UCN) facility under development at TRIUMF will introduce a dual co-magnetometer with cohabiting $^{129}$Xe and $^{199}$Hg for measuring the neutrons electric dipole moment (nEDM). By simultaneously incorporating two atomic species we can characterize both the magnitude and gradient of the magnetic field, thereby lowering the systematic uncertainties in the nEDM measurement. Toward this end, the spin precession of polarized $^{129}$Xe is detected by measuring the fluorescence decay following the spin-selective two-photon transition at 252-nm 5p$^{6}$($^{1}$S$_{0}$) \rightarrow 5p$^{5}$($^{2}$P$_{3/2}$)6p. As there is no suitable commercial high power laser at 252 nm, we have built an optically pumped semiconductor laser with two stages of resonant frequency doubling to produce 320 mW at 252 nm. Further increase in the power, up to 7.5 W, is achieved via a 252 nm enhancement cavity. The precession of the second atomic source, $^{199}$Hg, is detected by absorption of 253-nm from the 6s$^{2}$($^{1}$S$_{0}$) \rightarrow 6s6p($^{3}$P$_{1}$). We have constructed an analogous laser system as the $^{129}$Xe laser but at 253-nm. In this talk I will present the construction and characterization of these two laser systems. [Preview Abstract] |
Saturday, October 15, 2016 3:00PM - 3:12PM |
KH.00004: Magnetic Characteristics of Two Metglas Alloys Marie Blatnik Magnetic shielding is gaining greater significance as precision experiments become more sensitive, such as for the Spallation Neutron Source nEDM [neutron electric dipole moment] measurement. Targeting a sensitivity of $10^{-28}$ e-cm, the SNS nEDM collaboration minimizes magnetic shield gradients and magnetic noise with a superconducting lead shield and several shield layers that include using a Metglas layer as a primary component. Metglas is a thin ribbon of proprietary engineered alloy that comes in many varieties. One alloy with high (as cast) permeability is Metglas alloy 2705M, which is primarily composed of Cobalt. However, this alloy will activate under neutron radiation and is therefore unsuitable. However, another high-performance Metglas alloy, 2826 MB, contains only trace amounts of Cobalt. A study of the shielding characteristics of the two alloys was performed, paying close attention to field oscillation frequency and magnitude. [Preview Abstract] |
Saturday, October 15, 2016 3:12PM - 3:24PM |
KH.00005: Achieving a precision field in the muon g-2 storage ring magnet at Fermilab H. Erik Swanson The Muon g-2 Experiment at Fermilab will measure the anomalous magnetic moment $a_\mu$ of the muon. The target precision is 140 parts per billion (ppb), a four-fold improvement over the previous Brookhaven E821 measurement which found a 3.5 standard deviation discrepancy from the Standard Model prediction. This precision requires knowing the magnetic field strength in the muon storage ring with an uncertainty of 70 ppb. The magnet is first shimmed to achieve an average uniformity of one part per million (ppm). The field in the muon storage volume will be periodically measured and continuously monitored using proton NMR with single shot precision of 10 ppb. This magnet was successfully commissioned in October, 2015 and the shimming of the field to achieve the ultimate uniformity has been ongoing since that time. We will present the final results of this year-long process, describing some of the unique instrumentation and analysis routines we have developed along the way. [Preview Abstract] |
Saturday, October 15, 2016 3:24PM - 3:36PM |
KH.00006: Performance of the instrumentation for measuring $\omega_a$ in the Muon g-2 experiment Kim Siang Khaw The Muon g-2 experiment at Fermilab will begin data taking in 2017. The precision goal of 140 ppb requires collecting 21 times more data than the BNL E821 experiment, which resulted in the now well-known $>3\sigma$ deviation between measurement and the Standard Model prediction. In addition the systematic uncertainties must be reduced by a factor of 3. To this end, an all-new detector and electronics instrumentation used to determine the anomalous precession frequency was designed. We report here on a recent test-beam run at SLAC that acquired realistic data from initial calorimeter calibration through fully reconstructed offline analysis. We will report on the performance of the following state-of-the-art systems: laser-based calibration network, PbF$_2$ calorimeter with ultra-fast SiPM readout, custom 800 MSPS 12-bit digitizers, online DAQ with an active GPU processing farm, and finally {\it art}-based offline framework. The combination of a mono-energetic multi-GeV electron beam and a sophisticated fast laser firing sequence enabled data to be taken at a variety of rates under controlled conditions. These tests provided crucial information regarding the needed performance for the systematics and established the capability of the instrumentation to handle high data rate. [Preview Abstract] |
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