The measuring systems of the wire tension for the MEG II Drift Chamber by means of the resonant frequency technique

被引：1

作者：

Baldini, A. M. ^{[5
]}

Benmansour, H. ^{[5
,6
]}

Cavoto, G. ^{[1
,2
]}

Cei, F. ^{[5
,6
]}

Chiappini, M. ^{[5
]}

Chiarello, G. ^{[5
]}

Chiri, C. ^{[4
]}

Cocciolo, G. ^{[3
,4
]}

Corvaglia, A. ^{[4
]}

Cuna, F. ^{[1
,2
]}

Francesconi, M. ^{[5
,6
]}

Galli, L. ^{[5
]}

Grancagnolo, F. ^{[4
]}

Grassi, M. ^{[5
]}

Meucci, M. ^{[1
,2
]}

Miccoli, A. ^{[4
]}

Nicolo, D. ^{[5
,6
]}

Panareo, M. ^{[3
,4
]}

Papa, A. ^{[5
,6
,8
]}

Pinto, C. ^{[3
,4
]}

Raffaelli, F. ^{[5
]}

Renga, F. ^{[2
]}

Signorelli, G. ^{[5
]}

Tassielli, G. F. ^{[7
]}

Venturini, A. ^{[5
,6
]}

Vitali, B. ^{[5
,6
]}

Voena, C. ^{[2
]}

机构：

[1] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[2] Ist Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy

[3] Univ Salento, Dipartimento Matemat & Fis Ennio De Giorgi, Via Arnesano, Lecce, Italy

[4] Ist Nazl Fis Nucl, Sez Lecce, Via Arnesano, Lecce, Italy

[5] Ist Nazl Fis Nucl, Sez Pisa, Largo B Pontecorvo 3, I-56127 Pisa, Italy

[6] Univ Pisa, Dipartimento Fis, Largo B Pontecorvo 3, I-56127 Pisa, Italy

[7] Univ Bari, Dipartimento Fis, Campus Univ,Via Amendola 173, I-70125 Bari, Italy

[8] Paul Scherrer Inst PSI, CH-5232 Villigen, Switzerland

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2023年 / 1045卷

关键词：

Drift Chambers; Thin wires; Resonance; Measurement of mechanical tensio;

D O I：

10.1016/j.nima.2022.167534

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The ultra-low mass cylindrical drift chamber designed for the MEG II experiment is a challenging apparatus made of 1728 phi = 20 mu m gold plated tungsten sense wires, 7680 phi = 40 mu m and 2496 phi = 50 mu m silver plated aluminium field wires. Because of electrostatic stability requirements all the wires have to be stretched at mechanical tensions of similar to 25, similar to 19 and similar to 29 g respectively which must be controlled at a level better than 0.5 g. This chamber is presently in acquisition, but during its construction similar to 100 field wires broke, because of chemical corrosion induced by the atmospheric humidity. On the basis of the experience gained with this chamber we decided to build a new one, equipped with a different type of wires less sensitive to corrosion. The choice of the new wire required a deep inspection of its characteristics and one of the main tools for doing this is a system for measuring the wire tension by means of the resonant frequency technique, which is described in this paper. The system forces the wires to oscillate by applying a sinusoidal signal at a known frequency, and then measures the variation of the capacitance between a wire and a common ground plane as a function of the external signal frequency. We present the details of the measuring system and the results obtained by scanning the mechanical tensions of two samples of MEG II cylindrical drift chamber wires and discuss the possible improvements of the experimental apparatus and of the measuring technique.

引用

页数：11

共 46 条

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