Exploration of grid scheme for Frisch-grid ionization chamber

Li, Meng; Yang, Yan; Ma, P.; Jun-wei, Zhang; Qin, Z.; Wei, Xianglun; Xiao, Chen; Qiu, Tianli; He, Zhoubo; He, Zhixuan; Lu, Chengpeng; Hu, Rong-Jiang; Yang, Herun; Fang, Y.; Zhang, Xiao; Wang, Hongwei; Hou, Y.; Duan, Limin; Ong, Hooi Jin

doi:10.1140/epjc/s10052-021-09879-y

“…The simulated electron transmittance is the proportion of the number of electrons collected by the anode to the original number of electrons. The experimental value of the electron transmittance as a comparison is the ratio of the tested anode pulse height to its saturation pulse height [18]. The simulation results of the 60-mesh and 40-mesh SSWWM grid shown in figure 9 are basically consistent with the experimental results that verifies the reliability of the simulation method.…”

Section: Jinst 17 P08038supporting

confidence: 75%

Grid ionization chamber based on stainless steel woven wire mesh

Li

¹

,

He

²

,

Xiao

³

et al. 2022

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The grid electrode of the grid ionization chamber (GIC) is devoted to eliminating the dependence of the anode pulse amplitude on the initial position and orientation of the ionization. The traditional methods of grid production require cumbersome processes and advanced instruments. In this paper, a bonded stainless steel woven wire mesh (SSWWM) grid electrode manufacturing method is proposed. Compared with the traditional grid electrode, the SSWWM grid features the advantages of simple fabrication, low cost, and high mechanical strength. The energy resolutions of the 40-mesh, 60-mesh and 80-mesh SSWWM grids and orthogonal mesh grid realized by the traditional wire winding method were tested using an 241Am source (around 5.486 MeV). The results show that the optimum energy resolution of the SSWWM and orthogonal mesh grids is approximately 47 keV full width at half-maximum (FWHM). The optimal energy resolutions of the 40-mesh and 60-mesh SSWWM grids are comparable, but the initial operating voltages corresponding to the energy resolution plateau are different, mainly because of the effect of the different geometric parameters of the SSWWM grid on the electron transmittance. A simulation program was used to study the electron transmittance of the SSWWM grid. The simulation results are in agreement with the experimental results, indicating that the simulation program can be used as a reference for the selection of the geometric parameters of the SSWWM grid.

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“…To achieve a homogeneous electric field inside the field cage, 1.5 mm wide and 2 mm pitch parallel copper strips are etched on both sides of the FR4 substrate [36,37]. The copper strips on opposite sides are half-pitch staggered as shown in Fig.…”

Section: Field Cagementioning

confidence: 99%

Development of a semi-cylindrical time projection chamber prototype for ($$^{3}{\textrm{He}},t$$) charge exchange reaction experiment

He,

Li,

Bu

et al. 2023

Eur. Phys. J. C

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The charge exchange (CE) reaction is an effective probe to study the structure of atomic nuclei in the isospin dimension, which has been studied for decades. To expand the range of nuclei studied by CE reactions to a wider range and research the structure characteristics of unstable nuclei, including the isospin symmetry, spin-isospin excitation, and nuclear symmetry energy, a semi-cylindrical time projection chamber (scTPC) prototype was designed and constructed to probe ($$^{\textrm{3}}$$ 3 He,t) CE reactions in inverse kinematics. The 266 nm UV laser was used to achieve electron-drift-velocity calibration. The scTPC has an energy resolution (FWHM) of 5.6% for $$\alpha $$ α particles emitted by $$^{\textrm{241}}$$ 241 Am radioactive source. The position resolution of scTPC is described by the residual method. The spatial resolution on the pad plane is 409 $$\upmu $$ μ m. And the position resolution in the drift direction is 326 $$\upmu $$ μ m, equivalent to an angular resolution of 0.4$$^\circ $$ ∘ . These performances suggest that the scTPC can measure $$\Delta E $$ Δ E and particle tracks precisely. The successful development of the scTPC prototype provides better conditions for the next step of experimental data analysis and processing.

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“…The operation voltages of the detector were determined following the pioneering FG-IC work by Li et al [24], which provides a relation between optimum electron transmittance and electric field ratio (E c : E a ) for different wire gate; here E c and E a are the electric field strength between the cathodegrid and anode-grid regions, respectively. In this article, the accurate electric field ratio is 1:2.2 (E d : E c ) for a Frisch grid with gold-plated tungsten wires of 50-μm diameter and a 500-μm pitch.…”

Section: Working Gas and Voltage Settingmentioning

confidence: 99%

“…Figure 6 presents the energy spectra obtained at 700 mbar of the P10 gas with an 241 Am source for the different sealed windows. The red lines represent the best-fitted Gaussian peak taking into account the known alpha peak energies and branching ratios The energy resolution was calculated using the full width at half maximum (FWHM) and peak position of the main alpha (5.48556 MeV) decay branch with a branching ratio of 84.8% [24]. Throughout all of the measurements, we used identical methods to determine the FWHM and the peak position.…”

Section: Comparison Of Total Energy Deposition For α Sourcementioning

confidence: 99%

New trapezoid-shaped Frisch-grid ionization chamber for low-energy particle measurements

Qiu

¹

,

Yang

²

,

Yuan

³

et al. 2022

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A new trapezoid-shaped Frisch-grid ionization chamber (TFG-IC) has been built as a part of a $$\varDelta {E}-E$$ Δ E - E telescope system for the detection and identification of charged particles at energies down to a few MeV. To study the effect of the drift electric field uniformity, two types of sealed windows, namely a pair of SSA (split-strip aluminized mylar film) and a pair of DSA (double-sided aluminized mylar film) sealed windows have been investigated. The detector’s performances were studied using a standard $$^{241}$$ 241 Am source at different gas pressures, and the total energy-deposit resolution achieved is about 1.1%(FWHM). The $$\varDelta {E}-E$$ Δ E - E telescope, which was composed of TFG-IC and a DSSSD (double-sided silicon strip detector), has been tested using a three-component $$\alpha $$ α source and the $$^{241}$$ 241 Am source under laboratory conditions. The results show that the energy resolution with the SSA sealed windows which provide uniform drift electric field has a smaller fluctuation than that with the DSA ones; the fluctuations are about 1% and 4% for the former and the latter, respectively. Simulations using the COMSOL software also confirmed the electric-field distortion at the edge of the detector with the DSA windows. A correlation curve between energy resolution and energy deposit of charged particles at various gas pressures and for two gas species is derived for TFG-IC with the SSA sealed windows using the measurement with the $$^{241}$$ 241 Am source. Incorporating the above results, we performed Monte Carlo simulations to evaluate the particle-identification capability of the telescope. The results show that the telescope can be extended to the identification of low-energy particles.

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Exploration of grid scheme for Frisch-grid ionization chamber

Cited by 4 publications

References 15 publications

Grid ionization chamber based on stainless steel woven wire mesh

Grid ionization chamber based on stainless steel woven wire mesh

Development of a semi-cylindrical time projection chamber prototype for ($$^{3}{\textrm{He}},t$$) charge exchange reaction experiment

New trapezoid-shaped Frisch-grid ionization chamber for low-energy particle measurements

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