RESUMO
The objective of linear IFMIF prototype accelerator is to demonstrate 125 mA/CW deuterium ion beam acceleration up to 9 MeV. The injector has been developed in CEA Saclay and already demonstrated 140 mA/100 keV deuterium beam [R. Gobin et al., Rev. Sci. Instrum. 85, 02A918 (2014)]. The injector was disassembled and delivered to the International Fusion Energy Research Center in Rokkasho, Japan. After reassembling the injector, commissioning has started in 2014. Up to now, 100 keV/120 mA/CW hydrogen and 100 keV/90 mA/CW deuterium ion beams have been produced stably from a 10 mm diameter extraction aperture with a low beam emittance of 0.21 π mm mrad (rms, normalized). Neutron production by D-D reaction up to 2.4 × 10(9) n/s has been observed in the deuterium operation.
RESUMO
The first long pulse production of high power D(-) ion beams has been demonstrated in the JT-60 U negative ion sources, each of which was designed to produce 22 A, 500 keV D(-) ion beams. Voltage holding capability and the grid power loading were examined for long pulse production of high power D(-) ion beams. From the correlation between voltage holding and the light intensity of cathodoluminescence from the Fiber Reinforced Plastic insulators, the acceleration voltage for stable voltage holding capability was found to be less than 320-340 kV where the light was sufficiently suppressed. By tuning the extraction voltage, the grid power loadings in the ion sources were decreased to the allowable levels for long pulse injection without a significant reduction of the beam power. After tuning the acceleration and extraction voltages, D(-) ion beams of 12.5 and 9.8 A were produced at 340 keV with cesium seeding at a rate of approximately 14 microg/s into the ion sources. The pulse duration of these D(-) ion beams was extended step by step, and then was successfully extended up to 18 s without degradation of the negative ion production. The D(-) ion beams were neutralized to yield 3.6 MW D(0) beams by a gas cell, and then injected into the JT-60 U plasma. Further, a slight reduction of D(-) ion beam power allowed the longer injection duration of 21 s at a D(0) beam power of 3.2 MW. The success in the long pulse production of a high power D(-) ion beam shows that negative ion beams can be produced during a few tens of seconds without degradations of negative ion production and the voltage holding in a large Cs-seeded negative ion source.
RESUMO
Peak latencies of pattern electroretinogram (PERG) were compared between glaucomatous eyes and non-glaucomatous eyes. Contrast threshold for motion perception (CTMP) was also measured with a new device in addition to routine static contrast sensitivity, static visual field and visual acuity. In the present recording, configurations for PERG, i.e. low reversal rate, low mean luminance and presence of background illumination, the PERG peak and trough (P1 and N2, respectively) latencies, were significantly prolonged in the glaucomatous eyes. Although both of the two PERG latencies were strongly correlated with the CTMP, only the P1 peak latency was strongly correlated with the perimetric indices. These results suggest that the P1 and N2 latencies reflect different aspects of signal processing in the retina, especially for moving targets.
Assuntos
Sensibilidades de Contraste , Eletrorretinografia , Glaucoma de Ângulo Aberto/fisiopatologia , Percepção de Movimento , Limiar Sensorial , Adolescente , Adulto , Idoso , Criança , Potenciais Evocados Visuais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Tempo de Reação , Valores de Referência , Acuidade Visual , Testes de Campo VisualRESUMO
A new and highly sensitive reagent is proposed for spectrophotometric determination of cadmium. alpha,beta,gamma,delta-Tetrakis (4-N-trimethylaminophenyl) porphine forms a chelate with cadmium in alkaline solution with a molar absorptivity of 5.77 x 10(5)l. mole(-1).cm(t1), the largest value reported to date for a cadmium complex. An extraction method is described for selective separation of cadmium.
