Print ISSN: 1608-9391

Online ISSN: 2664-2786

Main Subjects : Optic Physics

The Effect of the Geometrical Parameters on the Characteristics of the Saddle Magnetic Deflector

Marwa T. Al-Shamma; Muna A. Al-Khashab

Rafidain Journal of Science, Volume 27, Issue 3, Pages 47-56
DOI: 10.33899/rjs.2018.159389

In this research work the saddle magnetic deflector has been designed, and studied the effect of the geometrical parameters on the characteristics of the magnetic deflector by using one of the simulation programs known as Electron Optical Design (EOD), which is written in Compaq Visual Fortran 6.6 uses the finite elements method. It has been found that the variations of the axial bore diameter and length of deflector have a great effect on its properties as well as the amount of magnetic deflections. The effect of variation of the thickness of deflector was very small. The effect of the angle of the deflector and its excitation was also studied and found that there is a direct effect on the value of a magnetic deflection only.


Calculate and Analysis of Air Mass and Solar Angles of Mosul City

Taha M. Al-Maula; Abdullah I. Al-Abdulla

Rafidain Journal of Science, Volume 27, Issue 3, Pages 57-65
DOI: 10.33899/rjs.2018.159386

The solar radiation energy of the city of Mosul was calculated according to the value of AM = 1.24 on 21 March and September, theoretically using formula 7 and measuring it practically using the radiometer of the intensity of the optical radiation emitted from the solar simulator that was designed in the laboratory. There are values of 982 W / m2 and 996 W / m2 , respectively, comparing these values in Table 1 with published values for other sites. Table (1) AM values and solar radiation intensity theoretically using formula (7) and practically for different angular values.
For the purpose of solar simulators manufacturing, the air mass (AM) were calculated for the city of Mosul at Altitude line (36.35o) and Longitude line (43.100) and at a height of 220 meters above sea level, this required the computation of the Solar inclination angle (δ), the hour angle ( , the Solar elevation angle (h) and the zenith angle (Z), in addition to that, the calculations were studied in specified day, chosen at the 21st of each month From sunrise to sunset, which is the daylight hours. The study showed that, the values of AM become equals to one at twelve o'clock and 1.24 on the 21st of March and September when the sun at the zenith angle 36.35o. Also it has been found that the variation of the angle of solar elevation and daylight hours rise to its maximum values at noon and then decreases gradually with daylight hours even the sunset hours. Also the zenith angle and daylight hour's decreases gradually to its minimum value at solar noon time and then rise again at the sunset hours. also it has been found that the relationship between the air mass values vary daily by changing the values of daylight hours.
The results show Vary daily by changing the values of daylight hours the AM values decreases with the solar elevation angle while its values increase with zenith angle. The values of AM have been computed for both daylight hour and hour angle its value decreases to minimum value at noon and raise the value of AM again at the end of daylight hour. The curves profile of AM variation with solar angle and zenith angle are of similar behavior with the published for other locations. The standard value of AM for Mosul City that adopted in this research work at altitude line 36.35o is equal to 1.24 on the 21st of March and September and 1.03 on the 21st of June and 1.8 on the 21st of December.