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RISS 인기검색어
- 검색키워드
- 저자 : Gad Khaled M. M. (검색결과 3 건)
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M. KHALED,M. GAD EL RAB,F. HACHEM,H. ELHAGE,A. ELMARAKBI,F. HARAMBAT,H. PEERHOSSAINI 한국자동차공학회 2016 International journal of automotive technology Vol.17 No.4
Fans are often tested without downstream blockage and, thus, the performance is considerably different when the fan is mounted in a vehicle as part of a cooling system and where high blockage effect is present downstream. The aim of the present work is to analyze by laser Doppler velocimetry LDV measurements the topology of the flow induced by a fan incorporated in a simplified underhood model reproducing engine blockage and to study the blockage effect of the engine positioning on the flow induced by the fan. The distance between the fan and the engine block affects the mean flow axial velocity U. The vertical velocity component W is greatly influenced by the variation of the distance between the fan and the engine block, both in magnitude and topology.
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Technical design of an axial injection low-energy carbon beam line
Gad Khaled M. M.,Namgoong Ho,Ghergherehchi Mitra,Chai Jong-Seo 한국물리학회 2024 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.84 No.9
Ongoing research and development eff orts are being conducted at Sungkyunkwan University—Korea with the objective of creating an Atomic Mass Spectrometer (AMS) cyclotron that presents a more compact and cost-eff ective alternative to the conventional Tandem AMS system. The construction of cyclotrons frequently encounters diffi culties, mostly arising from instabilities and substantial losses of ion beams, particularly during the injection phase that usually depends on an axial injection mechanism. In this paper, we undertake an in-depth investigation into the comprehensive design exploration of a low-energy carbon ion beam line. The optimization processes were done using Trace3D, TOSCA, and OpticExpert codes. The TOSCA software, in particular, enabled the use of three-dimensional simulations related to the complicated behavior of ion beams. The presented paper off ers an in-depth examination of the beam line, illustrating the engineering elements of essential optical parts, such as quadrupoles and dipoles. Following the production process, all of the beam line parts were subjected to extensive testing. The fi nal results, including magnetic fi eld measurements and fi eld gradients, showed an excellent match with our physical models. At the same time, a thermal study of the air-cooled quadrupole coils was carried out using the ANSYS APDL program. The construction of beam line has been done. An analysis of beam measurements will be carried out and subsequently compared to the calculated models. The objective of this comparison analysis is to ascertain the most optimal design method, with a focus on achieving effi ciency and reliability in the fi nal beam line system.
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Improvement of the RF cavity for the SKKUCY-10 cyclotron
Lee Jongchul,Ghergherehchi Mitra,Gad Khaled M. M.,Ha Donghyup,Namgoong Ho,Lee Seunghyun,Song Ho Seung,Karatas Berat Can,Chai Jong-Seo 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.79 No.9
The SKKUCY-10 cyclotron based on 83.2 MHz, 40 kV half-wave RF cavity was developed at Sungkyunkwan University for the production of medical radioisotopes. The resonant frequency fRF of the cyclotron and the RF coupling coefficient βc of the RF cavity system were measured at various vacuum, and temperature conditions. The normalized multi-pacting intensities at four positions in the power coupler were analyzed to predict the multi-pacting power. Differences, ΔfRF and Δβc , caused by the vacuum, and temperature conditions were modified based on the coupler and tuner gap distances. During the RF conditioning, a constant 15 kW pulse mode and a variable 1 to 15 kW continuous wave mode were employed. The values of the reflection coefficient Γ and βc were 1.2% and 0.8, respectively, when the cavity dissipation power was 12.4 kW at 83.2 MHz. Good agreement between the simulation and experimental data was obtained.
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