Performance of a MICROMEGAS-based TPC in a high-energy neutron beam

Snyder, L.; Manning, B.; Bowden, N. S.; Bundgaard, J.; Casperson, R. J.; Cebra, D.; Classen, T.; Duke, D. L.; Gearhart, J.; Greife, U.; Hagmann, C.; Heffner, M.; Hensle, D.; Higgins, Dan; Isenhower, D.; King, J.; Klay, J. L.; Geppert-Kleinrath, V.; Loveland, W.; Magee, J. A.; Mendenhall, M. P.; Sangiorgio, S.; Seilhan, B.; Schmitt, K. T.; Tôvesson, F.; Towell, R. S.; Walsh, N.; Watson, S.; Yao, L.; Younes, W.

doi:10.1016/j.nima.2017.10.028

Cited by 13 publications

(6 citation statements)

References 24 publications

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“…The limited fit ranges change the result by less than 0.5 to 3 %. A potential bias in the three-dimensional reconstruction of particle tracks from raw data in the fissionTPC is the uncertainty in the drift speed, see [28]. Changing the nominal drift speed value in the reconstruction changes the z-positions of reconstructed signals and the track length and polar angle of reconstructed fission fragment tracks.…”

Section: Uncertainty Quantificationmentioning

confidence: 99%

Fission fragment angular anisotropy in neutron-induced fission of U235 measured with a time projection chamber

Geppert-Kleinrath

Tôvesson²,

Barrett³

et al. 2019

Phys. Rev. C

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Fission fragment angular distributions can provide an important constraint on fission theory, improving predictive fission codes, and are a prerequisite for a precise ratio cross section measurement. Available anisotropy data is sparse, especially at neutron energies above 5 MeV. For the first time, a three-dimensional tracking detector is employed to study fragment emission angles and provide a direct measurement of angular anisotropy. The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration has deployed the fission time projection chamber (fissionTPC) to measure nuclear data with unprecedented precision. The fission fragment anisotropy of 235 U has been measured over a wide range of incident neutron energies from 180 keV to 200 MeV; a careful study of the systematic uncertainties complement the data.

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Section: Uncertainty Quantificationmentioning

confidence: 99%

Fission fragment angular anisotropy in neutron-induced fission of U235 measured with a time projection chamber

Geppert-Kleinrath

Tôvesson²,

Barrett³

et al. 2019

Phys. Rev. C

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“…Inputs to the simulations have been chosen to closely approximate realistic detector conditions. The charge amplification gain and gas properties were chosen to enable stable operation of the fissionTPC when operated in highenergy neutron environment [18]. The simulations are performed using a gas mixture of neon and 5% isobutane and total pressures in the range of 550 to 1500 Torr.…”

Section: Measurement Methodsmentioning

confidence: 99%

1H(n,el) as a Cross Section Reference in a White Source Neutron Beam With the fissionTPC

Walsh¹,

Barker²,

Bowden³

et al. 2019

Preprint

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We provide a quantitative description of a method to measure neutron-induced fission cross sections in ratio to elastic hydrogen scattering in a white-source neutron beam with the fission Time Projection Chamber. This detector has measured precision fission cross section ratios using actinide references such as 235 U(n,f) and 238 U(n,f). However, by employing a more precise reference such as the H(n,el) cross section there is the potential to further reduce the evaluation uncertainties of the measured cross sections. In principle the fissionTPC could provide a unique measurement by simultaneously measuring both fission fragments and proton recoils over a large solid angle. We investigate one method with a hydrogenous gas target and with the neutron energy determined by the proton recoil kinematics. This method enables the measurement to be performed in a white-source neutron beam and with the current configuration of the fissionTPC. We show that while such a measurement is feasible in the energy range of 0.5 MeV to ∼10 MeV, uncertainties on the proton detection efficiency and the neutron energy resolution do not allow us to preform a fission ratio measurement to the desired precision. Utilizing either a direct measurement of the neutron time-of-flight for the recoil proton or a mono-energetic neutron source or some combination of both would provide a path to a sub-percent precision measurement.

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“…Ionizing radiation strips electrons from the fill gas which are drifted to the anode pad planes by a static electric field of 500 V/cm. Each volume has a highly segmented anode with 2976 hexagonal readout pads, 2 mm in pitch, and a MICROMEGAS (MICRO MEsh Gaseous Structure) metal mesh [19] held 75 μm above the pads for gas amplification to produce a gain factor of approximately 40 [20]. The drift chamber, filled with 95% argon / 5% isobutane at 550 torr [20], is 15 cm in diameter and each anode is 5.4 cm from the central cathode.…”

Section: Detectormentioning

confidence: 99%

“…Each volume has a highly segmented anode with 2976 hexagonal readout pads, 2 mm in pitch, and a MICROMEGAS (MICRO MEsh Gaseous Structure) metal mesh [19] held 75 μm above the pads for gas amplification to produce a gain factor of approximately 40 [20]. The drift chamber, filled with 95% argon / 5% isobutane at 550 torr [20], is 15 cm in diameter and each anode is 5.4 cm from the central cathode. Each of the anode pads are connected to custom electronic readout cards with a sampling rate of 20 ns.…”

Section: Detectormentioning

confidence: 99%

Neutron Induced Fission Fragment Angular Distributions, Anisotropy, and Linear Momentum Transfer Measured with the NIFFTE Fission Time Projection Chamber

Hensle,

Barker,

Barrett

et al. 2020

Preprint

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The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration has performed measurements with a fission time projection chamber (fissionTPC) to study the fission process by reconstructing full three-dimensional tracks of fission fragments and other ionizing radiation. The amount of linear momentum imparted to the fissioning nucleus by the incident neutron can be inferred by measuring the opening angle between the fission fragments. Using this measured linear momentum, fission fragment angular distributions can be converted to the center-of-mass frame for anisotropy measurements. Angular anisotropy is an important experimental observable for understanding the quantum mechanical state of the fissioning nucleus and vital to determining detection efficiency for cross section measurements. Neutron linear momentum transfer to fissioning 235 U, 238 U, and 239 Pu and fission fragment angular anisotropy of 235 U and 238 U as a function of neutron energies in the range 130 keV-250 MeV are presented.

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Performance of a MICROMEGAS-based TPC in a high-energy neutron beam

Cited by 13 publications

References 24 publications

Fission fragment angular anisotropy in neutron-induced fission of U235 measured with a time projection chamber

Fission fragment angular anisotropy in neutron-induced fission of U235 measured with a time projection chamber

1H(n,el) as a Cross Section Reference in a White Source Neutron Beam With the fissionTPC

Neutron Induced Fission Fragment Angular Distributions, Anisotropy, and Linear Momentum Transfer Measured with the NIFFTE Fission Time Projection Chamber

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