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Browsing by Author "Pawlik, Bogdan"

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    A proposal for the mechanical design of the LumiCal detector
    (Institute of Nuclear Physics Polish Academy of Sciences, 2006) Błocki, Jacek; Daniluk, Witold; Gil, M.; Moszczyński, Arkadiusz; Oliwa, Krzysztof; Pawlik, Bogdan; Suszycki, Leszek; Wierba, Wojciech; Zawiejski, Leszek
    The LumiCal calorimeter [1] will be located in very forward region of the future detector at the International Linear Collider (ILC) [2] . It is compose of tungsten plates and thirty silicon detector planes. It will be used for precisely luminosity measurement. The requirement for the position stability of the silicon detectors is very high. The actual position of each silicon detector plane relative to each other and of the calorimeter relative to the beam line and the interaction point should be known with accuracy of a few micrometers. To achieve this goal the structure of the calorimeter has to be very stiff. Moreover, the support and the temperature of the calorimeter have to be stable. The aim of this paper is to describe the mechanical structure of the detector which can fulfill the requirement of the structure stiffness. For the proposed structure appropriate calculations of deformations under the dead load have been carried out. From presented here results of calculations it is concluded that the proposed structure can be accepted from the stiffness point of view.
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    CMOS optical sensor and readout electronics for LumiCal Alignment System
    (Institute of Nuclear Physics Polish Academy of Sciences, 2007) Błocki, Jacek; Daniluk, Witold; Gil, M.; Kielar, Eryk; Moszczyński, Arkadiusz; Oliwa, Krzysztof; Pawlik, Bogdan; Słomiński, Wojciech; Suszycki, Leszek; Wierba, Wojciech; Zawiejski, Leszek
    The silicon-tungsten calorimeter LumiCal, located in very forward region of the future detector at the International Linear Collider, is proposed for precisely luminosity measurement. One of the requirements to fulfil this task is available information on the actual position of the calorimeter relative to the beam interaction area which should be known with accuracy of a few micrometers. In this paper we present project measurement unit for the positioning of the LumiCal electron detector by optical method using a laser beam and a CMOS sensor.
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    Higgs physics at the CLIC electron–positron linear collider
    (The European Physical Journal C, 2017) Daniluk, Witold; Krupa, Beata; Kucharczyk, Marcin; Lesiak, Tadeusz; Moszczyński, Arkadiusz; Pawlik, Bogdan; Sopicki, Paweł; Wojtoń, Tomasz; Zawiejski, Leszek
    The Compact Linear Collider (CLIC) is an option for a future e+e− collider operating at centre-of-mass energies up to 3 TeV, providing sensitivity to a wide range of new physics phenomena and precision physics measurements at the energy frontier. This paper is the first comprehensive presentation of the Higgs physics reach of CLIC operating at three energy stages: √s = 350 GeV, 1.4 and 3 TeV. The initial stage of operation allows the study of Higgs boson production in Higgsstrahlung (e+e− → ZH) and WW-fusion (e+e− → Hνe ¯νe), resulting in precise measurements of the production cross sections, the Higgs total decay width ΓH, and model-independent determinations of the Higgs couplings. Operation at √s > 1 TeV provides high-statistics samples of Higgs bosons produced through WW-fusion, enabling tight constraints on the Higgs boson couplings. Studies of the rarer processes e+e− → t¯tH and e+e− → HHνe ¯νe allow measurements of the top Yukawa coupling and the Higgs boson self-coupling. This paper presents detailed studies of the precision achievable with Higgs measurements at CLIC and describes the interpretation of these measurements in a global fit.
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    Laser measurement of the LumiCal detector displacement
    (Institute of Nuclear Physics Polish Academy of Sciences, 2006) Błocki, Jacek; Daniluk, Witold; Gil, M.; Karbowiak, Michał; Moszczyński, Arkadiusz; Oliwa, Krzysztof; Pawlik, Bogdan; Słomiński, Wojciech; Suszycki, Leszek; Wierba, Wojciech; Zawiejski, Leszek
    The silicon-tungsten calorimeter LumiCal, located in very forward region of the future detector at the International Linear Collider, is proposed for precisely luminosity measurement. One of the requirements to fulfil this task is available information on the actual position of the calorimeter relative to the beam interaction area which should be known with accuracy of a few micrometers. In this paper we discuss the possible solutions for the positioning of the LumiCal electron detector by optical method. The results of the displacement measurement using a laser beam and a CCD camera are described. The measurements were performed on a proof-of-principle basis and achieved the accuracy of about ± 1 μm in x, y and ± 3 μm in z direction.
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    Silicon sensors for the LumiCal for the Very Forward Region
    (Institute of Nuclear Physics Polish Academy of Sciences, 2007) Błocki, Jacek; Daniluk, Witold; Dąbrowski, Władysław; Gil, M.; Harder, U.; Idzik, Marek; Kielar, Eryk; Moszczyński, Arkadiusz; Oliwa, Krzysztof; Pawlik, Bogdan; Suszycki, Leszek; Wierba, Wojciech; Zawiejski, Leszek
    The silicon-tungsten calorimeter LumiCal, located in very forward region of the future detector at the International Linear Collider, is proposed for the precise luminosity measurements based on the Bhabha scattering process. For this purpose, the precise measurement of the scattering polar angles is crucial. A silicon–tungsten sandwich calorimeter with fine–segmented silicon sensors has been designed for this purpose. This paper describes two slightly different designs of silicon sensors for the LumiCal based on available silicon technologies and especially on the possibility of cutting silicon wafers on curved lines.
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    The optical alignment system for luminosity detector at ILC
    (Institute of Nuclear Physics Polish Academy of Sciences, 2014) Banaś, Elżbieta; Daniluk, Witold; Kielar, Eryk; Kotuła, Jerzy; Krupa, Beata; Moszczyński, Arkadiusz; Oliwa, Krzysztof; Pawlik, Bogdan; Wierba, Wojciech; Zawiejski, Leszek
    The possibility to use semi-transparent silicon detectors to measure the displacement detector luminosity LumiCal, planned for the future linear accelerator ILC / CLIC, was studied using an optical laser system based on these detectors. Preliminary results of measurements were achieved using the prototype of this system provided in the displacement measurement values of the X and Y directions with an accuracy of a few microns.