Power Transmission In Space Research Articles

Effect of cell structures on electrical degradation of GaAs laser power convertors after 1 MeV electron irradiation and structure-optimization for improving radiation resistance

Laser wireless power transfer (LWPT) technology holds significant promise for wireless power transmission in space, necessitating that high-efficiency GaAs laser power convertors (LPCs) have strong tolerance to high-energy particle radiation. Therefore, the degradation characteristics of GaAs LPCs with different architectures under 1 MeV electron irradiation were investigated. Experimental and simulation results demonstrate that LPCs with thicker bottom cells suffer from significantly more electrical degradation. The degradation is primarily due to a reduction in electron concentrations in the base of the bottom cells, which is considerably less pronounced as the thickness of the bottom cells decreases. Based on these analyses, thinning the thickness and optimizing the doping profile for the bottom cells are proposed to improve the radiation resistance of the LPCs. Simulations show that the electrical degradation of the optimized four-junction LPCs is notably less than that of the original four-junction LPCs under the same irradiation conditions, indicating that the proposed strategies effectively enhance the radiation resistance of the LPCs.

Laser Source for Wireless Power Transmission in Space

For many years the attempts to create a super long conductive channel were taken in order to study the upper atmosphere and to settle special tasks, related to the energy transmission. There upon the program of “Impulsar” creation represents a great interest, as this program in a combination with high-voltage high repetition rate electrical source can be useful to solve the above mentioned problems. It looks like as some kind of “renaissance of N. Tesla ideas” for the days of high power lasers. In the experiments the GDL CO2-laser and solid state Nd YAG laser systems had been used. Theoretical and experimental investigation of high repetition rate P-P mode of operation for high power lasers (COIL, HF/DF) had been provided. The experimental realization of P-P regime has been demonstrated for 100 KW GDL and 1 kW LD pumped SSL. More than two orders of magnitude ratio of peak to average power with minimal energy loss have been obtained. High efficiency and excellent beam quality of disk laser mean that it can be widely used in modern science and industry. Disk laser idea, suggested by N. G. Basov 52 years ago, after implementation in the mono-module disk geometry can be used effectively for many important challenges faced by science and technological advances of the future. Today we can say that creation of megawatt class mono-module P-P disk laser with a large cross section of the active medium opens up great prospects for its use for solving of the set of problems: small satellites launching by lasers, formation of super-long conducting channels in space (vacuum and atmosphere), cleaning of the near-Earth space from the debris and so on.

Transmission media appropriate laser-microwave solar power satellite system

As a solution to the most critical problems with Solar power Satellite (SPS) development, a system is proposed which uses laser power transmission in space to a receiver high in the atmosphere that relays the power to Earth by either cable or microwave power transmission. It has been shown in the past that such hybrid systems have the advantages of a reduction in the mass of equipment required in geostationary orbit and avoidance of radio frequency interference with other satellites and terrestrial communications systems. The advantage over a purely laser power beam SPS is that atmospheric absorption is avoided and outages due to clouds and precipitation will not occur, allowing for deployment in the equatorial zone and guaranteeing year round operation. This proposal is supported by brief literature surveys and theoretical calculations to estimate crucial parameters in this paper.In relation to this concept, we build on a recently proposed method to collect solar energy by a tethered balloon at high altitude because it enables a low-cost start for bringing the first Watt of power to Earth giving some quick return on investment, which is desperately missing in the traditional SPS concept.To tackle the significant problem of GW-class SPSs of high launch cost per kg mass brought to space, this paper introduces a concept which aims to achieve a superior power over mass ratio compared to traditional satellite designs by the use of thin-film solar cells combined with optical fibres for power delivery. To minimise the aperture sizes and cost of the transmitting and receiving components of the satellite and high altitude receiver, closed-loop laser beam pointing and target tracking is crucial for pointing a laser beam onto a target area that is of similar size to the beam's diameter. A recently developed technique based on optical phase conjugation is introduced and its applicability for maintaining power transmission between the satellite and high altitude receiver is assessed.It was found that the design of the high altitude receiver and the means of transporting the received power through the lower 21km of the atmosphere are inextricably linked. It was concluded that an initial small scale low-cost demonstration flight of the receiver that delivers power using existing technology could be undertaken in the near future.

マイクロ波による無線電力伝送

This paper describes the wireless power transmission via microwave (MPT) system for the Space Solar Power Station/Satellite (SPS). The SPS will be hugest space system and we need high efficient, huge, high accurate, light weight and inexpensive phased array for the SPS. Now we do not have any commercial MPT system on ground. Therefore, we have to consider the roadmap of the MPT system from the ground application to the SPS. We propose three step application of the MPT as follows; 1st Step: Weak Power Wireless Power Transmission (Ubiquitous Power Source, RF-ID, Energy Harvesting) under Present Radio Wave Configuration or High Power Wireless Power Transmission in Closed Area 2nd Step: High Power Wireless Power Transmission to/from Moving Target/Source with Phased Array under New Radio Wave Configuration (Special Frequency for WPT) on Ground 3rd (Final) Step: Wireless Power Transmission in Space (SPS)

Computer simulation on nonlinear interaction of intense microwave with space plasmas

AbstractThe concept of a solar power station (SPS) was proposed 25 years ago. During the intervening years, long‐distance, high‐power transmission microwave technology has advanced. Realization of wireless power transmission in space is now no longer a dream. It has been predicted from three‐way coupling that a static plasma wave is excited when an intense microwave passes through space plasma. the microwave power transmission rocket experiment in an ionosphere carried out by the authors (MINIX, Microwave Ionosphere Nonlinear Interaction experiment) has confirmed this fact. In this experiment, a phenomenon that cannot be explained by the three wave resonance theory has been discovered. In this paper, a computer experiment using plasma has been carried out with an electromagnetic particle code. Static plasma wave excitation and the saturation phenomenon are explained in which not only the simple three‐wave coupling but also the wave‐particle interaction are included.

Propulsion Assisted by Microwave Power

In this paper are presented possible applications of microwaves to propulsion. First, some basic propulsion principles are reviewed to the extent necessary to expose what follows. Next, the functions that can be performed by microwave power in the propulsion field are studied. Areas of possible applicability and their boundaries are analyzed. Among these areas are spacecraft launching, power transmission in space, and ground take-off assist for fuel economy. Power requirements are presented for some specific cases. The problems associated with the use of microwaves as part of the power system are outlined, as are some means of solution.