X-Message-Number: 21001 From: Date: Wed, 29 Jan 2003 08:08:03 EST Subject: Flea --part1_164.1ae9e067.2b692c33_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Flea is a project about using lasers for a quantum non-demolition x-rays brain reader.An industrial facility must be built to produce the hardware, one solution was to set it near Paris, another in the Sout-East part of France. The second option has been selected. Financing is by real estate operations, a pilot project is planned, because there are some autorizations to proceed, two options are under consideration. The hope is to have the paperwork ok for investment this summer. The is some new shift in the technical definition. The first idea was to pump a nuclear laser with a dye optical laser, itself pumped by an ordinary laser of the metal vapour kind. At each step the energy coupling is very bad and more than 99% of the energy is lost. that translate into an enormous energy requirement at start. A second option was about using two face to face interferometric mirrors to entangle a large number of optical photons so that a nuclear level pumping was done directly by the metal vapour laser. The problem was about thermal dissipation in the tick gelatin making up the holographic mirrors. No solution has been found and that way was turned down. The current option is simpler on technological ground but more exotic. The dye laser is recovered but the metal vapour one is discarded. Pumping is by entangled radio waves in the centimeter range. The radio wave are produced in a klystron set and send between two mirrors. These have not to be of the interferometric kind, they are made from niobium alloys on a glass support. The output is a slit .1 micrometer wide, something that may be produced and controled with optical instruments. That setting will entangle one million radio wave photons, their collective absorption will pump the dye laser. Using that number of photons reduce the waveband by the square root of one million, that is one thousand. The low conversion energy efficiency of dye lasers comes from bad spectral fit. The pumping radiation is spread over a large spectrum when the dye sees only a narrow band. Using a large number of entangled photons reduce the pumping spectrum spread. Another useful tool is to send a sound wave in the dye so that different parts move at different speed. The resulting Doppler shift allows to scan the pump spectrum and so to collect more energy. The dye laser has a natural bent to work with high modes producing up to 200 entangled photons in up to 200 beams. In each beam a pair of liquid mirrors would further entangle some ten photons so that the final total energy of 2000 UV photons would be in the 10keV range, sufficient to pump a 2 - 3 keV X-ray beam. The big problem is with the coherence lenght of the x-rays, it must be more than 100 000 km, that is it must be produced by a metastabe energy level with half life at least 1/3 of a second long. this is not a problem in nuclear domain, but the waveband is exceedingly narrow, even by dye laser standards. Entanglement help to reduce the spectrum spread by 30 or so, but it will be necessary to vibrate the x-ray lasing medium so that the Doppler shift will give a better coverage of the pumping spectrum. The next step is where to find the technology, if there is a requirement for unobtainium, the entire system fails. The radio power is produced by klystrons, that technology is used in particle accelerator physics so there is an industrial source for them. For tests, an organization such the CERN could sell back old klystrons at good price. A machine to make ultraflat mirrors has been found, cooling the mirrors so that they superconduct is not a big problem. That technology will solve all heat problems in the mirrors. High efficiency dye laser pumping looks as a readilly solvable problem. The mirrors to entangle ten dye laser photons would use 3 liquid elements: mercury for the first mirror, a dense trensparent liquid to propagate the light, this product would be similar to those used in gem stones control. The second mirror would be made of oil with a reflecting coloidal load. A similar product has been used at the Laval University by E. Borra et al. in a liquid mirror. That technology must produce the ten nanometers wide exit slit without using interferometric mirrors. Pumping the x-ray laser would so be brought down to garage technology. Yvan Bozzonetti. --part1_164.1ae9e067.2b692c33_boundary Content-Type: text/html; charset="US-ASCII" [ AUTOMATICALLY SKIPPING HTML ENCODING! ] Rate This Message: http://www.cryonet.org/cgi-bin/rate.cgi?msg=21001