http://www.bbc.co.uk/programmes/b0752f85QuoteProject Greenglow - The Quest for Gravity ControlHorizon, 2015-2016This is the story of an extraordinary scientific adventure - the attempt to control gravity. For centuries, the precise workings of gravity have confounded the greatest scientific minds - from Newton to Faraday and Einstein - and the idea of controlling gravity has been seen as little more than a fanciful dream. Yet in the mid 1990s, UK defence manufacturer BAE Systems began a ground-breaking project code-named 'Greenglow', which set about turning science fiction into reality. On the other side of the Atlantic, Nasa was simultaneously running its own Breakthrough Propulsion Physics Project. It was concerned with potential space applications of new physics, including concepts like 'faster-than-light travel' and 'warp drives'.Looking into the past and projecting into the future, Horizon explores science's long-standing obsession with the idea of gravity control. It looks at recent breakthroughs in the search for loopholes in conventional physics and examines how the groundwork carried out by Project Greenglow has helped change our understanding of the universe. Gravity control may sound like science fiction, but the research that began with Project Greenglow is very much on-going, and the dream of flying cars and journeys to the stars no longer seems quite so distant.The program segment will probably be geo blocked outside the UK. Do trust it will make the jump to open access YouTube.
Project Greenglow - The Quest for Gravity ControlHorizon, 2015-2016This is the story of an extraordinary scientific adventure - the attempt to control gravity. For centuries, the precise workings of gravity have confounded the greatest scientific minds - from Newton to Faraday and Einstein - and the idea of controlling gravity has been seen as little more than a fanciful dream. Yet in the mid 1990s, UK defence manufacturer BAE Systems began a ground-breaking project code-named 'Greenglow', which set about turning science fiction into reality. On the other side of the Atlantic, Nasa was simultaneously running its own Breakthrough Propulsion Physics Project. It was concerned with potential space applications of new physics, including concepts like 'faster-than-light travel' and 'warp drives'.Looking into the past and projecting into the future, Horizon explores science's long-standing obsession with the idea of gravity control. It looks at recent breakthroughs in the search for loopholes in conventional physics and examines how the groundwork carried out by Project Greenglow has helped change our understanding of the universe. Gravity control may sound like science fiction, but the research that began with Project Greenglow is very much on-going, and the dream of flying cars and journeys to the stars no longer seems quite so distant.
MHT1003NR3 arrived. It is a little smaller than I expected. This little 3-pin RF LDMOSFET transistor can output 250 watts @ 2.45Ghz with 32v DC!
Quote from: rfmwguy on 03/14/2016 03:47 pmPaul Kocyla in Aachen, Germany is beginning to test the 24 GHz emdrive on a rotary flotation pad. Unquantified force measurements, appears to be calibration tests:Would appreciate somebody familiar with this testing program to clarify:1) are the battery and the mini-EM-drive integrated together on the testing platform for the Kocyla test? DeltaMass and I had agreed that by far the best proposed test was TheTraveller's proposal to have a battery and the EM Drive on a rotary platform together (rather than having the power be fed from a stationary source to a moving EM Drive which has a big testing flaw: the center of energy-mass is outside the moving EM Drive, therefore measuring an acceleration in such a test is flawed since in space the source of power would need to be in the same spaceship as the EM Drive)2) What is the present testing platform arrangement?
Paul Kocyla in Aachen, Germany is beginning to test the 24 GHz emdrive on a rotary flotation pad. Unquantified force measurements, appears to be calibration tests:
This is the Horizon episode on the BBC 23/03/16 featuring EM drive.http://www.bbc.co.uk/programmes/b0752f85
It looks at recent breakthroughs in the search for loopholes in conventional physics
superconductors (even Type I) have a finite RF resistance and so don't produce infinite Q cavities. Ordinary conductors like Cu and Ag have their surface resistance continuously declining with temperature, extrapolated to 0 resistance at 0K. For *RF* purposes, just cold copper is approaching the performance of a Type 1 superconductor at the low temperatures that would be needed for Type I superconductivity. But, Cu and Ag have the advantage that they do not have a critical temperature where everything falls apart.
This caught my eye on another forum where EM-drive was being discussed (off-topic):Quotesuperconductors (even Type I) have a finite RF resistance and so don't produce infinite Q cavities. Ordinary conductors like Cu and Ag have their surface resistance continuously declining with temperature, extrapolated to 0 resistance at 0K. For *RF* purposes, just cold copper is approaching the performance of a Type 1 superconductor at the low temperatures that would be needed for Type I superconductivity. But, Cu and Ag have the advantage that they do not have a critical temperature where everything falls apart.I don't know if this is true, but if it is it seems quite interesting.R.
Build UpDate,Due to continuing issues with my prostate cancer, there has not been any work done on my test rig. Following discussions with Roger on the poor Q (some shared here), I have decided to stop working with the existing frustum build. Working on a new build that will be machined & commercially polished to the very high standards Roger has set. This design will have spherical end plates and the side walls will be 6mm thick, with minimal 6mm thick end plates.The end plates will be attached as Roger did in his Flight Thruster, so to allow differential pressure around the flange bolts to slightly alter the end plate to end plate alignment so to allow Q tuning with a torque wrench as happens in high Q accelerator cavities.This will not be a cheap or quick build but as I have seen 8mNs of reaction, I have full confidence this build will deliver the min 20mN of reaction force (out of a theoretical 39mN) needed to take this to the independent measurement verification stage and then to release the data....
Alternatively, how about testing instead with your proposed setup having the battery and the EM-drive integrated together on the testing platform?...
Photon collisions creating mass require about 1 MeV of energy, far above a magnetrons power which I would guess is 1 KeV.
Quote from: rfmwguy on 03/16/2016 11:20 amPhoton collisions creating mass require about 1 MeV of energy, far above a magnetrons power which I would guess is 1 KeV.At 2.45Ghz the quantum energy of a microwave photon is 10^-5 eV. I believe hard X-rays approach 1MeV.
Dr. Rodal - I'm still wondering about ratio-ing Ag/CU * copper conductivity to obtain a valid Ag conductivity, but in the mean time, I have a new question for you, and all. meep is converging nicely now to positive Q values but they are still unreal. I just completed a run of the NSF-1701A model and meep calculated Q as 328,441. That's nice but it seems to me that it is about an order of magnitude to large.Is it possible that you or DeltaMass misplaced a decimal point giving conductivity off by a factor of 10? I doubt that you did because in following the symbolic math you provided, I calculated the same number that you did. But we both started with the number for sigma, CU-sigmaSI 3.25E+8. Perhaps that should have been 10^+7 instead. Does that seem reasonable?
3.25E+8 was not the conductivity. 3.25E+8 is the number in SI units that corresponds to the expression used in Meep: it is not the conductivity, it is instead the imaginary part of the relative complex permittivityTherefore 3.25E+8 corresponds instead to epsilon"/epsilon_o = 0.00288/epsilon_o
Well, Dr. Rodal, thank you for that extensive tutorial reply. While waiting, I went ahead and changed the number from 10^8 to 10^7 and as I suspected, it reduced the Q value calculated by meep by one order of magnitude. That is, meep calculated Q = 32,900 with all else being the same as had resulted in Q = 329,436 before. Resonant frequency was the same as before while energy in the fields was reduced. All that is as should be expected.I do need to do a convergence study because I already know that, for this model, the calculated resonant frequency is higher with higher resolution. But that won't happen with this machine as I've noted previously. Not enough of either memory or cpu to double resolution more than once.
using a given geometry (thickness, diameters, length) and using pure copper as material input.
