Chapter 1382 Oddly symmetrical shape


    In order to implement this ground closed-loop nuclear magnetic fluid power generation verification plan, Factory 504 deployed a server with very powerful performance in advance.


    As a result, the formal engineering renovation has not yet begun, and the equipment has been used first...


    Later that day.


    As Chang Haonan''s fingers tick the keyboard quickly, the generated three-dimensional magnetic field model simulated on the screen is constantly distorted and reorganized as the parameter adjustments.


    Of course, the magnetic wire does not really exist, but even the professional researchers have to admit that this thing is simple and intuitive.


    Located in the control room next door, the young engineer held his breath and watched the red alarm sign flash repeatedly at some critical value.


    “Reduce the current of the fifth and eighth coils to 85% of the rating.”


    Chang Haonan suddenly spoke, his eyes still locked in the magnetic footprint picture presented on the screen.


    The operator immediately executed the instructions, and the originally restless magnetic field waveform slightly flattened, but the dark red abnormal area was still looming at the edge of the disc power generation channel.


    “Reducing the magnetic induction intensity will alleviate the disorder of the magnetic field topology…but this is the obvious part, and nothing has changed in essence…”


    He shook his head to himself.


    The atmosphere in the room fell into silence again.


    Han Chenfeng walked in from the door at this time, holding a laptop in his hand:


    "Academician Chang, I re-checked the coil assembly parameters and found that there was an assembly error of about 10 microns in the yoke frame."


    He said and called out two sets of comparison data:


    "When designing, I considered that the impact on the static magnetic field could be ignored, but if simulated according to dynamic disturbances, this asymmetry would be amplified by resonance... about two to three orders of magnitude."


    Although I didn''t continue, the meaning was already very obvious.


    However, Chang Haonan shook his head decisively:


    "Not mentioning the cost and tolerance problems caused by further improving installation accuracy, these two to three orders of magnitude amplification levels sound scary, but in fact, it is less than one ten thousandth of the magnetic field position and shape accuracy. Levels will not be the root cause of the disorder of the magnetic field topology."


    If you want to say that things like electromagnetic devices are precise, they are indeed precise.


    But this precision is often not reflected in mechanical precision visible to the naked eye.


    For example, the International Thermal Nuclear Fusion Experimental Reactor (ITER) that has just been launched recently, the allowable errors during permanent magnet installation are even sub-millimeters or even millimeters, and there will be no obvious interference.


    Such an exaggerated change in the magnetic field structure in front of us must be the fault of the electromagnetic conversion process itself.


    "Academician Chang!"


    At this time, the laboratory door was pushed open suddenly, and Peng Juexian walked in with a work clothes stained with oil:


    "The resonance disturbance spectrum and Poincaré chart you want have come out. In addition, I also checked the harmonic interference of the factory backup power supply, which has no correlation with the magnetic field disturbance frequency."


    Chang Haonan didn''t care at all about the latter news.


    The harmonic interference of irrelevant power supplies can almost be regarded as a metaphysical concept, which is equivalent to the source of electricity affecting the sound quality of the headphones. The reason why Peng Jue first checked it is to hold on to the idea of ??"hitting three poles" if you have dates or not." That''s it.


    The key is still the first half.


    "Open the resonance perturbation spectrum first!"


    Chang Haonan ordered in the direction of the control room next door.


    Soon, an energy map with blue and green intersecting and slightly similar structure to an alien face appeared on the big screen.


    “…”


    He glanced at the system interface that was still calling the alarm, and suddenly reached out and pressed the emergency brake button.


    As the low buzzing sound gradually weakened, a row of alarm lights on the system interface also went out or turned green one after another.


    This action made Peng Jue''s eyelids twitch:


    "Academician Chang, a sudden interruption of plasma flow will cause."


    “It will cause damage to the iridium alloy electrode worth eight million, I know.”


    Chang Haonan said with a plain face:


    "But the cost is controllable than allowing the random layer to expand to destroy the cavity itself."


    Immediately afterwards, he pointed his hand at the dark blue patches on the left and right corners of the screen:


    "See? The area with a Chirikov factor exceeding 0.8 already accounts for 17% of the channel cross-section."


    Now, not only Peng Juexian, but also Han Chenfeng, who was stepping a little behind, was shocked:


    "Um?"


    The Chirikov factor is not a data displayed directly on the image, but requires a little secondary processing.


    The "a little" here is for computers. It seems a bit exaggerated to rely on the human brain to make judgments in such a short time.


    Of course, in fact, if it weren''t for the system''s reminder, Chang Haonan really did not notice this problem at the first time. But this matter cannot be explained in detail, so he quickly returned to the topic just now:


    "You see, the most intense part of the disturbance spectral type just coincides with the equilibrium magnetic surface, and in theory, strong resonance means that the resonant magnetic surface will be subjected to greater radial disturbances, resulting in an increase in the width of the magnetic island, thus Generate a larger Chirikov factor, and the width of the random layer will be larger..."


    Sure enough, everyone''s attention followed him and turned his attention to the screen again.


    But Chang Haonan''s speech was very fast just now, and the description was a bit abrupt, and no one could react for a while.


    Only Peng Juexian came back a little:


    "It means... the magnetic line can connect the target plate of the upper outer filter and the plasma area, causing a large number of particles to directly bombard the upper filter and trigger an alarm?"


    This is still a description of the phenomenon, not a root cause analysis.


    Fortunately, the equipment has been suspended, so there is no need to worry about this moment.


    "Now, bringing up the Poincaré diagram of the magnetic field topology, I guess some magnetic island chains should be found relatively close to the plasma core, and near the X point of the boundary, a stable and non-stable manifold will form mutually The crossed bar epitaxial structure…may be similar to a crushed hexagram.”


    Speaking of this, Chang Haonan smiled and turned his head, half-jokingly said:


    "Does anyone want to make a bet?"


    In fact, everyone is still skeptical about his description.


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    But I have to say that I stand up and make a bet.


    No one answered.


    Let’s not talk about gambling.


    If you lose, wouldn’t that be embarrassing?


    And if you win, will the leader be embarrassed and can you still have good results?


    In order to avoid the discontinuation, the operator sitting outside the door quickly transferred out the Poincalaitu that Chang Haonan asked for.


    “Oh~”


    A low scream suddenly sounded in the crowd.


    The line style presented on the picture is almost exactly the same as what Chang Haonan said.


    Although due to the setting of the axis, the overall figure is so flat that it is a bit abstract.


    But the six sharp corners that are clearly protruding can still be seen.


    Chang Haonan grabbed the laser pen on the table, drew a few sharp lines on the screen, and looked at Han Chenfeng:


    "Lao Han, is the design plan you proposed before based on theoretical prediction of equilibrium formant?"


    "Yes, mirror symmetry through adjacent magnetic islands..."


    The latter suddenly stopped halfway through his speech, and his pupils contracted slightly:


    "etc…"


    He took the laser pointer and circled several key points on the topology diagram:


    "It seems to be reversed... When the magnetic surface rotation angle forms a rational number relationship with the disturbance frequency, the even symmetric arrangement that should have suppressed the expansion of the random layer may instead be due to the coherence of the position of the normalized magnetic flux, resulting in stronger Resonance?”


    "It should be."


    Although Chang Haonan gave a positive answer, the expression on his face did not relax, and he was obviously still considering longer-term issues.


    Han Chenfeng has already thought of a new solution:


    "So, if the current phase of the upper and lower groups of active control coils is controlled at 180° and an odd-symmetric coil shape is obtained, wouldn''t the degree of distortion of the magnetic field topology that is greatly weakened?"


    Chang Haonan''s temple was thundering, and there was no answer immediately, but he just re-releases the video surveillance when the alarm occurred on the computer.


    I saw crystal indigo blue fluorescence appearing on the inner wall of the disc generator.


    This is a sign that ionic liquid penetrates into the weak zone of magnetic constraint.


    After thinking for a long time, Chang Haonan nodded and agreed to the plan proposed by the other party:


    "At this stage... we can first improve as Lao Han said."


    Han Chenfeng''s expression was happy at first, but his expression quickly solidified on his face.


    Since we say "at this stage", it means that there will be major changes in the future.


    And Chang Haonan also quickly explained:


    "In the simulation stage, as long as the apparent topology of the magnetic field can be maintained stable, if it really doesn''t work, it can be shut down and restarted, and it will not delay the necessary operating parameters and acquisition... But if the magnetic surface instability problem cannot be fundamentally solved, only the coil positioning will be changed In other words, it is equivalent to exchanging precious ionizing seed consumption for temporary smooth operation."


    "And it must also be considered that a true closed-loop nuclear magnetic fluid power generation system does not have one or two circuits. Even if the cost is not considered, it is impossible to open the lid of the nuclear reactor and add ionization seeds into it, so this is unacceptable for practical applications. of…"


    (End of this chapter)