The BLAST experiment

Hasell, D.; Akdoğan, T.; Alarcón, R.; Bertozzi, W.; Booth, E.C.; Botto, T.; Calarco, J. R.; Clasie, B.; Crawford, Chris; DeGrush, Adam J.; Dow, K.; Dutta, D.; Farkhondeh, M.; Fatemi, R.; Filoti, O.; Franklin, Wilbur A.; H, Gao; Geis, E.; Gilad, S.; Hersman, W.; Holtrop, M.; Ihloff, E.; Karpius, Peter Joseph; Kelsey, J.; Köhl, M.; Kolster, H.; Krause, S.; Lee, T.; Maschinot, A.; Matthews, J.; McIlhany, K.; Meitanis, N.; Milner, R.; Rapaport, J.; Redwine, R.; Seely, J.; Shinozaki, Ayako; Sindile, A.; Širca, S.; Smith, T.; Sobczynski, S.; Tanguay, Michel; Tonguç, Barış Tamer; Tschalaer, C.; Tsentalovich, E.; Turchinetz, W.; Brand, J. van den; Laan, J. van der; Wang, F.; Wise, T.; Xiao, Yong; Xü, Wei-Jiang; Zhang, Cheng; Zhou, Zhengfang; Ziskin, V.; Zwart, T.

doi:10.1016/j.nima.2009.01.131

Cited by 33 publications

(40 citation statements)

References 20 publications

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“…The toroidal magnet, drift chambers, time-of-flight detectors, support frames, and many of the readout and control electronics were originally part of the BLAST spectrometer [39] at MIT-Bates. These components were shipped to DESY in spring 2010 where they were reassembled, reconditioned, and modified as necessary for installation in the OLYMPUS detector.…”

Section: The Olympus Detectormentioning

confidence: 99%

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The OLYMPUS experiment

Milner

Hasell

Köhl

et al. 2014

Nuclear Instruments and Methods in Physics Research Section A:

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The OLYMPUS experiment was designed to measure the ratio between the positronproton and electron-proton elastic scattering cross sections, with the goal of determining the contribution of two-photon exchange to the elastic cross section. Two-photon exchange might resolve the discrepancy between measurements of the proton form factor ratio,, made using polarization techniques and those made in unpolarized experiments. OLYMPUS operated on the DORIS storage ring at DESY, alternating between 2.01 GeV electron and positron beams incident on an internal hydrogen gas target. The experiment used a toroidal magnetic spectrometer instrumented with drift chambers and time-of-flight detectors to measure rates for elastic scattering over the polar angular range of approximately 25• -75• . Symmetric Møller/Bhabha calorimeters at 1.29• and telescopes of GEM and MWPC detectors at 12• served as luminosity monitors. A total luminosity of approximately 4.5 fb −1 was collected over two running periods in 2012.

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Section: The Olympus Detectormentioning

confidence: 99%

“…The drift chambers used for the OLYMPUS experiment came from the BLAST experiment at MIT-Bates and have been described in great detail elsewhere [39], so the following description will be brief while mentioning new and updated features.…”

Section: Drift Chambersmentioning

confidence: 99%

The OLYMPUS experiment

Milner

Hasell

Köhl

et al. 2014

Nuclear Instruments and Methods in Physics Research Section A:

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“…The internal, unpolarized, isotopically pure hydrogen gas target was designed to deliver 3 · 10 15 atoms/s, corresponding to a luminosity of 2 · 10 33 /(cm 2 s). The OLYMPUS detector has largely been based on the previous BLAST apparatus from the MITBates Linear Accelerator Center [31][32][33][34], a toroidal spectrometer with excellent tracking capability over a wide range of scattering angles of ≈ 20…”

Section: The Olympus Experimentsmentioning

confidence: 99%

“…The schematic layout of OLYMPUS is shown on the l.h.s. of Fig 2. Of the original BLAST setup [31], the toroidal magnet, the wire chambers (WC) and the time-of-flight scintillators (TOF) have been used. Forwardangle elastic scattering luminosity monitoring systems have been constructed at Hampton University (GEM detector telescopes) and Petersburg Nuclear Physics Institute (multi-wire proportional chambers, MWPC).…”

Section: The Olympus Experimentsmentioning

confidence: 99%

EM Form Factors and OLYMPUS

Köhl

2014

EPJ Web of Conferences

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Abstract. The elastic form factors of the nucleon characterize the distributions of charge and magnetization in momentum space and are important input for calculations of strong interaction phenomena and nuclear structure. The dramatic discrepancy in the observed ratio of elastic proton form factors between the Rosenbluth separation and polarization transfer methods has invoked numerous theoretical and experimental investigations. The previously neglected effect from two-photon exchange has become the favored explanation for the discrepancy. While the effect can not be calculated from first principles, it can be verified experimentally in several ways, most stringently by comparing the positronproton and electron-proton elastic cross sections. The OLYMPUS experiment at DESY has been carried out to quantify the effect of two-photon exchange using intense stored positron and electron beams along with an internal unpolarized hydrogen target and a large acceptance detector to measure the ratio of the positron-proton and electron-proton elastic scattering cross sections. The status of proton form factor measurements and of the experimental efforts to verify the effect of two-photon exchange is presented, with some emphasis on the OLYMPUS experiment.

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“…The BLAST experiment [21] was designed to exploit the power of a highly polarized electron beam incident on highly polarized targets of hydrogen and deuterium to measure the form factors of the proton, neutron, and deuteron in a precise and systematic manner.…”

Section: The Blast Experimentsmentioning

confidence: 99%

Spin-Dependent Electron Scattering from Polarized Protons and Deuterons with the BLAST Experiment at MIT-Bates

Hasell

Milner

Redwine

et al. 2011

Annu. Rev. Nucl. Part. Sci.

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The Bates Large Acceptance Spectrometer Toroid (BLAST) experiment was operated at the MIT-Bates Linear Accelerator Center from 2003 until 2005. The experiment was designed to exploit the power of a polarized electron beam incident on polarized targets of hydrogen and deuterium to measure, in a systematic manner, the neutron, proton, and deuteron form factors as well as other aspects of the electromagnetic interaction on few-nucleon systems. A brief description of the experiment is provided, together with presentation and discussion of the numerous results obtained.

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The BLAST experiment

Cited by 33 publications

References 20 publications

The OLYMPUS experiment

The OLYMPUS experiment

EM Form Factors and OLYMPUS

Spin-Dependent Electron Scattering from Polarized Protons and Deuterons with the BLAST Experiment at MIT-Bates

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