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CERN Document Server 8 záznamov nájdených  Hľadanie trvalo 0.61 sekúnd. 
1.
The Role of Hydrogen Incorporation into Amorphous Carbon Films in the Change of the Secondary Electron Yield / Bundaleski, Nenad (New Lisbon U.) ; Adame, Carolina F. (New Lisbon U.) ; Alves, Eduardo (IST, Lisbon ; Lisbon U.) ; Barradas, Nuno P. (IST, Lisbon ; Lisbon U.) ; Cerqueira, Maria F. (Minho U.) ; Deuermeier, Jonas (New Lisbon U.) ; Delaup, Yorick ; Ferraria, Ana M. (IST, Lisbon) ; Ferreira, Isabel M.M. (New Lisbon U.) ; Neupert, Holger (CERN) et al.
Over the last few years, there has been increasing interest in the use of amorphous carbon thin films with low secondary electron yield (SEY) to mitigate electron multipacting in particle accelerators and RF devices. Previous works found that the SEY increases with the amount of incorporated hydrogen and correlates with the Tauc gap. [...]
2023 - 20 p. - Published in : Int. J. Molecular Sci. 24 (2023) 12999 Fulltext: PDF;
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2.
Amorphous carbon thin films: Mechanisms of hydrogen incorporationduring magnetron sputtering and consequences for the secondary electronemission / Adame, C F ; Alves, E (Lisbon, IST) ; Barradas, N P (Lisbon, IST) ; Costa Pinto, P (CERN) ; Delaup, Y (CERN) ; Ferreira, I M M ; Neupert, H (CERN) ; Himmerlich, M (CERN) ; Pfeiffer, S (CERN) ; Rimoldi, M (CERN) et al.
Amorphous carbon (a-C) films, having low secondary electron yield (SEY), are usedat CERN to suppress electron multipacting in the beam pipes of particleaccelerators. It was already demonstrated that hydrogen impurities increase theSEY of a-C films. [...]
2023 - 14 p. - Published in : J. Vac. Sci. Technol. A 41 (2023) 043412 Fulltext: PDF;
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3.
Rapid accurate automated analysis of complex ion beam analysis data / Marriott, P K ; Barradas, N P ; Jenkin, M ; Jeynes, C ; Sealy, B J ; Webb, R P
1998
In : 15th International Conference on the Applications of Accelerators in Research and Industry, Denton, TX, USA, 4 - 7 Nov 1998, pp.592-596
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4.
RBS/simulated annealing and FTIR characterization of BCN films deposited by dual cathode magnetron sputtering / Barradas, N P ; Evetts, J E ; Hutchings, I M ; Jeynes, C ; Kusano, Y
1998
In : 15th International Conference on the Applications of Accelerators in Research and Industry, Denton, TX, USA, 4 - 7 Nov 1998, pp.504-507
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5.
High precision measurement of the hyperfine fields of substitutional and defect associated Cd in single crystalline hcp cobalt / Correia, J G ; Barradas, N P ; Melo, A A ; Soares, J C /ISOLDE Collaboration
The hyperfine fields of Cd in single crystalline hcp Co were measured after simultaneous implantation of 111mCd and 111In. High statistics measurements could be done separately for each parent isotope combining the e--g and g-g PAC techniques. [...]
CERN-OPEN-2002-069.- Geneva : CERN, 1996 - 5 p. - Published in : Hyperfine Interact. C: 1 (1996) , pp. 37 Access to fulltext document: PDF; - CERN library copies
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6.
Electric-field gradients at the $^{111}In$ and $^{111m}Cd$ sites in undoped and Mg-doped $LiNbO_{3}$ / Hauer, B ; Vianden, R ; Marques, J G ; Barradas, N P ; Correia, J G ; Agulló-López, F ; Diéguez, E
The quadrupole interaction of 111Cd in undoped (congruent) and Mg-doped LiNbO3 single crystals has been studied using the perturbed angular correlation technique after implantation of 111In and 111mCd. A stepwise-annealing procedure shows the lattice to be fully reconstructed at 773 K. [...]
CERN-OPEN-2002-065.- Geneva : CERN, 1995 - 6 p. - Published in : Phys. Rev. B 51 (1995) 6208-6214 APS Published version, local copy: PDF; Access to fulltext document: PDF; - CERN library copies
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7.
Radiation tests on commercial instrumentation amplifiers, analog switches & DAC's / Agapito, J A ; Barradas, N P ; Cardeira, F M ; Casas, C ; Fernandes, A ; Franco, F J ; Gomes, P ; Gonçalves, I C ; Cachero, A H ; Lozano-Bahilo, J et al.
A study of several commercial instrumentation amplifiers (INA110, INA111, INA114, INA116, INA118 & INA121) under neutron and vestigial gamma radiation was done. Some parameters (Gain, input offset voltage, input bias currents) were measured on-line and bandwidth, and slew rate were determined before and after radiation. [...]
Geneva : CERN, 2001 Published version from CERN: PDF;
In : 7th Workshop on Electronics for LHC Experiments, Stockholm, Sweden, 10 - 14 Sep 2001, pp.117-121 (CERN-2001-005)
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8.
Instrumentation amplifiers and voltage controlled current sources for LHC cryogenic instrumentation / Agapito, J A ; Barradas, N P ; Cardeira, F M ; Casas-Cubillos, J ; Fernandes, A ; Franco, F J ; Gomes, P ; Gonçalves, I C ; Cachero, A H ; Lozano-Bahilo, J et al.
Geneva : CERN, 2000 Published version from CERN: PDF;
In : 6th Workshop on Electronics for LHC Experiments, Krakow, Poland, 11 - 15 Sep 2000, pp.275 (CERN-2000-010)
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