A half-size prototype of the multi wire drift chamber for the cooling storage ring external-target experiment (CEE) was assembled and tested in the 350 MeV/u Kr + Fe reactions at the heavy-ion research facility in Lanzhou. The prototype consists of six sense layers, where the sense wires are stretched in three directions X, U, and V; meeting <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41365_2024_1628_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="17" /> </InlineMediaObject> <EquationSource Format="TEX">$0^\circ$</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mn>0</mn> <mo>∘</mo> </msup> </math></EquationSource> </InlineEquation>, <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41365_2024_1628_Article_IEq2.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="25" /> </InlineMediaObject> <EquationSource Format="TEX">$30^\circ$</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mn>30</mn> <mo>∘</mo> </msup> </math></EquationSource> </InlineEquation>, and <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41365_2024_1628_Article_IEq3.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="39" /> </InlineMediaObject> <EquationSource Format="TEX">$-30^\circ$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo>-</mo> <msup> <mn>30</mn> <mo>∘</mo> </msup> </mrow> </math></EquationSource> </InlineEquation>, respectively, with respect to the vertical axis. The sensitive area of the prototype is <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41365_2024_1628_Article_IEq4.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="106" /> </InlineMediaObject> <EquationSource Format="TEX">$76 \mathrm{~cm} \times 76 \mathrm{~cm}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>76</mn> <mrow> <mspace width="3.33333pt" /> <mi mathvariant="normal">cm</mi> </mrow> <mo>×</mo> <mn>76</mn> <mrow> <mspace width="3.33333pt" /> <mi mathvariant="normal">cm</mi> </mrow> </mrow> </math></EquationSource> </InlineEquation>. The amplified and shaped signals from the anode wires were digitized in a serial capacity array. When operating at a high voltage of 1500 V on the anode wires, the efficiency for each layer is greater than 95%. The tracking residual is approximately <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41365_2024_1628_Article_IEq5.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="81" /> </InlineMediaObject> <EquationSource Format="TEX">$301 \pm 2 \,{\mu \mathrm{m}}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>301</mn> <mo>±</mo> <mn>2</mn> <mspace width="0.166667em" /> <mrow> <mi>μ</mi> <mi mathvariant="normal">m</mi> </mrow> </mrow> </math></EquationSource> </InlineEquation>. This performance satisfies the requirements of CEE.

Beam test results of the prototype of the multi wire drift chamber for the CSR external-target experiment

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发表日期：

2025年2月25日

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Zhi Qin,
Zhou-Bo He,
Zhe Cao,
Tao Chen,
Zhi Deng,
Li-Min Duan,
Dong Guo,
Rong-Jiang Hu,
Jie Kong,
Can-Wen Liu,
Peng Ma,
Tian-Lei Pu,
Yi Qian,
Xiang-Lun Wei,
Shi-Hai Wen,
Xiang-Jie Wen,
Jun-Wei Yan,
He-Run Yang,
Zuo-Qiao Yang,
Yu-Hong Yu,
Zhi-Gang Xiao

摘要

A half-size prototype of the multi wire drift chamber for the cooling storage ring external-target experiment (CEE) was assembled and tested in the 350 MeV/u Kr + Fe reactions at the heavy-ion research facility in Lanzhou. The prototype consists of six sense layers, where the sense wires are stretched in three directions X, U, and V; meeting $0^\circ$ $0^{\circ}$ , $30^\circ$ $30^{\circ}$ , and $-30^\circ$ $- 30^{\circ}$ , respectively, with respect to the vertical axis. The sensitive area of the prototype is $76 \mathrm{~cm} \times 76 \mathrm{~cm}$ $76 cm \times 76 cm$ . The amplified and shaped signals from the anode wires were digitized in a serial capacity array. When operating at a high voltage of 1500 V on the anode wires, the efficiency for each layer is greater than 95%. The tracking residual is approximately $301 \pm 2 \,{\mu \mathrm{m}}$ $301 \pm 2 μ m$ . This performance satisfies the requirements of CEE.