The test results of the Silicon Tungsten Tracker of DAMPE

Gallo, V.; Ambrosi, G.; Asfandiyarov, R.; Azzarello, P.; Bernardini, P.; Bertucci, Bruna; Bolognini, A.; Cadoux, F.; Caprai, M.; Mitri, I. De; Domenjoz, M.; Yifan, Dong; Duranti, M.; Rui, Fan; Fusco, P.; Gargano, F.; Gong, Ke; Guo, Dengji; Husi, C.; Ionica, M.; Marra, D. La; Loparco, Francesco; Marsella, G.; Mazziottai, Mario Nicola; Nardinocchi, Andrea; Nicola, L.; Pelleriti, G.; Peng, Wenxi; Pohl, M.; Postolache, V.; Qiao, Rui; Surdo, A.; Tykhonov, A.; Vitillo, S.; Wang, Huan‐Yu; Weber, M.; Wu, Di; Wu, Xin; Fei, Zhang

doi:10.22323/1.236.1199

Cited by 6 publications

(8 citation statements)

References 5 publications

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“…The resulting track-hit residual distributions for helium candidates are shown in Figures 11 and 12 for internal (2)(3)(4)(5) and external (1,6) x layers of the STK respectively, and associate fit values for the σ 1 and σ 12 parameters of the double-Gaussian functions are reported in Table 4. The residuals for the y layers exhibit a similar behavior.…”

Section: Position Resolution With Heliummentioning

confidence: 99%

Internal alignment and position resolution of the silicon tracker of DAMPE determined with orbit data

Tykhonov

Ambrosi

Asfandiyarov

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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The DArk Matter Particle Explorer (DAMPE) is a space-borne particle detector designed to probe electrons and gamma-rays in the few GeV to 10 TeV energy range, as well as cosmic-ray proton and nuclei components between 10 GeV and 100 TeV. The silicon-tungsten tracker-converter is a crucial component of DAMPE. It allows the direction of incoming photons converting into electron-positron pairs to be estimated, and the trajectory and charge (Z) of cosmic-ray particles to be identified. It consists of 768 silicon micro-strip sensors assembled in 6 double layers with a total active area of 6.6 m 2 . Silicon planes are interleaved with three layers of tungsten plates, resulting in about one radiation length of material in the tracker. Internal alignment parameters of the tracker have been determined on orbit, with non-showering protons and helium nuclei. We describe the alignment procedure and present the position resolution and alignment stability measurements. NUDBGO STK PSD z x y Figure 1: Schematic view of the DAMPE detector. Sensitive detectors and support structures are shown. The z-axis of the DAMPE coordinate system is oriented to the zenith, orthogonal to the STK planes and y points to the Sun.10 GeV to 100 TeV, with excellent energy resolution and direction precision [1,2]. The main objectives of DAMPE are the identification of possible indirect signatures of Dark Matter annihilation or decay, improving the understanding of the origin and propagation mechanisms of high energy cosmic rays and gamma-ray astronomy. It consists of four sub-detectors ( Figure 1) stacked together as follows, moving from top to bottom. First is a Plastic Scintillator-strip Detector (PSD), which measures the cosmic ray charge (Z) and provides the veto signal for charged particles in gamma-ray detection. It is followed by a Silicon-Tungsten tracKer-converter (STK), that is described in detail in the next section. Next, there is an imaging calorimeter made of 14 layers of Bismuth Germanium Oxide (BGO) bars in a hodoscopic arrangement with a total thickness of about 32 radiation lengths, which provides a precise energy measurement and particle identification for electron/hadron separation. The BGO is aided by the NeUtron Detector (NUD), a borondoped plastic scintillator detecting delayed neutrons coming from hadronic interactions at high energies, which serves to improve the electron/hadron separation power.The STK is a key component of DAMPE, allowing the trajectory and absolute ion charge (Z) of incoming particles to be reconstructed and measured respectively. Moreover, thanks to its high position resolution, the direction of incoming photons converting into electron-positron pairs in the STK's tungsten plates can be precisely reconstructed. In order to fully exploit the trajectory reconstruction capabilities of the STK, a precise alignment of the instrument is needed, as explained in this paper.The paper is organized as follows. In Section 2 the STK is briefly described. Section 3 provides the details of the on-orbit data and simulati...

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Section: Position Resolution With Heliummentioning

confidence: 99%

Internal alignment and position resolution of the silicon tracker of DAMPE determined with orbit data

Tykhonov

Ambrosi

Asfandiyarov

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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“…At ICRC 2015, the japanese-led CALET detector [35] and the chinese-led DAMPE satellite [36] were presented in some detail: they will explore an energy range up to several TeV with unprecedented resolution. CALET has been installed on the ISS in august 2015 while DAMPE is scheduled for launch in december 2015.…”

Section: Dark Mattermentioning

confidence: 99%

Dark matter phenomena

Cirelli¹

2016

Proceedings of the 34th International Cosmic Ray Conference — PoS(ICRC2015)

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“…Position resolution of silicon sensors of STK depends on the track impact angle and is as low as 40 µm for the vertical angles [8]. in order to fully exploit this resolution, positions of silicon sensors in the STK must be evaluated (aligned) with precision of about 10 µm.…”

Section: Preliminary Alignment Of the Silicon Tracker Of Dampementioning

confidence: 99%

“…In the STK, the silicon sensors are mounted into so-called ladders. There are 192 ladders, each bearing 4 sensors [8]. Taking into account possible shifts (2 degrees of freedom) and rotations (3 degrees of freedom) of each silicon sensor with respect to the expected ideal position, this yields 192 · 4 · 5 = 3840 alignment parameters to be evaluated.…”

Section: Pos(leptonphoton2015)104 Pos(leptonphoton2015)104mentioning

confidence: 99%

Offline and CAD-GEANT4 software of the DAMPE mission

Tykhonov¹

2016

Proceedings of XXVII International Symposium on Lepton Photon Interactions at High Energies — PoS(LeptonPhoton2015)

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An overview is given for the offline software framework of the DAMPE satellite mission. In particular, the problem of converting CAD detector model into the GEANT4-compatible format, GDML, is solved. The geometry of the DAMPE payload is implemented as GDML from the corresponding CAD drawings of the detector. The output of CAD-GDML conversion is parsed further to identify sensitive parts of the detector and convert them into simple geometries instead of tessellated ones. The GDML model is used both by the simulation and reconstruction jobs, and all other algorithms that may deal with the detector geometry. Next, preliminary results of the alignment of silicon tracker of DAMPE are presented. The alignment algorithm uses tracks that are reconstructed with the DAMPE offline software. It is performed with the cosmic data and relies on the minimisation of global χ 2 of reconstructed tracks.

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The test results of the Silicon Tungsten Tracker of DAMPE

Cited by 6 publications

References 5 publications

Internal alignment and position resolution of the silicon tracker of DAMPE determined with orbit data

Internal alignment and position resolution of the silicon tracker of DAMPE determined with orbit data

Dark matter phenomena

Offline and CAD-GEANT4 software of the DAMPE mission

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