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This topic is inspired by posts of Calliban about possible use of a magnetic field to keep gas molecules near a small body with insufficient gravity hold them.
Star Trek was science fiction, and it incorporated many concepts already well known to science fiction writers, and it added a number of forward looking concepts on it's own.
This topic is offered for New Mars members who might wish to contribute to a body of knowledge about how the force field notion shown in Star Trek might be realized.
Two examples of use of the field are:
1: the shuttle bay door
The shuttle bay was open to space via a transparent energy field of some kind, which kept ship's atmosphere inside.
2: The brig ... the individuals to be confined were directed to a room, and the room was secured by a transparent wall through which nothing could pass.
Of the two examples, the shuttle bay door is the more immediately pertinent, because it's primary purpose was to keep molecules of gas at ship's pressure from escaping into space.
The thickness of the shield was not revealed, but the theatrical illusion created was that it was like a pane of glass.
I will note that in the case of the shuttle bay door, that field had to hold ship's pressure over a significant distance, and it had to perform that function for long periods of time when the ship was not in flight or engaged in battle.
In Post #3, Gemini reported upon power requirements, and special features that allowed shuttles to traverse the shield without loss of air.
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This post is reserved for an index to posts that may be contributed by NewMars members.
Index:
Post #3: Gemini lookup about Star Trek shuttle bay door
Post #4: Follow up review of a plasma window invented in the US for use with an accelerator
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I asked Gemini to see what it could find in available literature about the force fields used for the shuttle bay doors. I had forgotten about the episode where the door failed, or might have missed it.
Please render your helpful answer in BBCode for our forum. Our parser is limited so please use 'list' to set items for viewing, use text for equations or chemical formulae, and 'h' with no parameters such as size to create large font.
Atmospheric Containment Fields in Star Trek
In the Star Trek universe, the transparent barrier securing open shuttle bays is formally designated as an Atmospheric Containment Field, a specialized variant of force field technology designed to maintain structural and environmental integrity.
Core Mechanics & Operating Principles
Localized Graviton Generation: The field is established using emitter arrays integrated into the perimeter of the shuttle bay door frame. These emitters project a high-density, localized spatial distortion across the opening.
Selective Pressure Permeability: Unlike tactical deflector shields—which are optimized to deflect high-velocity kinetic impacts and directed energy weapons—an atmospheric field acts as a selective pressure membrane.
Differential Particle Resistance: The field reflects fast-moving, low-mass gaseous molecules (such as diatomic nitrogen, N2, and oxygen, O2) to prevent rapid decompression into vacuum. Conversely, slow-moving, high-mass objects like a shuttlecraft can pass directly through the barrier.
Frequency Synchronization: Departing or arriving vessels synchronize their localized Structural Integrity Field (SIF) or navigational shields to the precise electromagnetic/graviton frequency of the bay doors. This allows the ship to pass through without disrupting the pressure seal.
Auxiliary Physical Barriers: Due to the continuous energy expenditure required to sustain the graviton field, starships feature heavy mechanical doors that close over the bay during warp travel or combat engagements.
In-Universe Examples
Star Trek: The Next Generation ("Disaster"): A complete power failure disables the shuttle bay containment field, causing immediate explosive atmospheric venting until manually secured.
Star Trek: First Contact: Crew members stand directly at the edge of an open shuttle bay while in deep space, fully protected from the vacuum by the active force field.
Real-World Scientific Parallels
Modern physics utilizes a similar concept known as a plasma window. By using magnetic fields to bind ionized gas (plasma) across an opening, laboratories can separate atmospheric pressure from a vacuum chamber while allowing particle beams or physical probes to pass through the barrier.
What would you like to do next?
Explore the physics behind real-world plasma windows
Compare Star Trek force fields to defensive shields
Analyze other ship containment systems in Star Trek
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In this post I asked Gemini to report on the plasma window invented for use with an accelerator ...
Thank you for the BBCode presentation of your research. It seems to me that the features of the shield are speculative in 2026. We were aware of a force field of some kind patented by an agency of the US government. My recollection is that the "shield" of interest was designed to permit particles to exit the vacuum chamber of a mass accelerators without allowing atmosphere molecules to enter the accelerator. Please refresh my memory of that invention.
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The technology you are remembering is the Plasma Window, invented and patented in 1995 by Dr. Ady Hershcovitch at Brookhaven National Laboratory (U.S. Patent 5,578,831).It was specifically designed to solve the challenge of transmitting high-energy particle beams out of a high-vacuum accelerator into normal atmospheric pressure without using a physical solid foil or barrier, which would otherwise degrade, overheat, or scatter the beam.
Key Mechanics of the Brookhaven Plasma Window
Ionized Gas Barrier: Instead of a solid window, the system creates a short, highly localized arc of helium or argon plasma (ionized gas) constrained within a narrow discharge channel.
Thermal Differential & Pressure Resistance: The plasma reaches extreme temperatures—around 12,000 Kelvin (~11,700°C / 21,000°F). Because gas density decreases dramatically as temperature rises, the hot plasma acts like an extremely dense wall to incoming cooler gas molecules.
Viscosity & Magnetic Confinement: At these extreme temperatures, the plasma's viscosity increases sharply while strong magnetic fields pinch and stabilize the ionized column. This prevents room-temperature atmospheric air from leaking into the vacuum chamber.
Beam Permeability: Charged particles or high-energy electron beams generated inside the vacuum accelerator pass right through the short plasma core with virtually zero resistance or beam degradation, as there are no physical atoms in a lattice (like glass or titanium) to cause beam dispersion.
Primary Applications
Particle Accelerator Egress: Allowing intense electron or ion beams to exit vacuum tubes into ambient air for industrial material processing, radiation treatment, or electron-beam welding without destroying a physical window.
Non-Destructive Testing: Transporting charged particle beams into high-pressure target environments for specialized physical and chemical analysis.
While it does not yet have the structural rigidity to stop solid macro-scale objects (like a Star Trek shuttlecraft), it remains the closest real-world analog to a selective atmospheric force field!
What would you like to do next?
Explore industrial uses of electron beam welding with plasma windows
Compare plasma window density mechanisms to mechanical vacuum pumps
Examine Dr. Ady Hershcovitch's 1995 Brookhaven plasma window patent
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Interesting. When solar radiation and cosmic rays interact with the upper atmosphere, they will naturally produce plasma through ionisation. These charged ions will thermalise through collision, giving rise to a relatively cold plasma. Presumably, the charged plasma particles will be trapped by a magnetic field. The plasma layer should then present an impermeable layer to the gas molecules underneath.
The problem I can see is that a strong magnetic field would be needed to do this. The magnetic pressure must exceed the dynamic pressure exerted on the plasma by the gas molecules.
Last edited by Calliban (2026-08-20 12:29:41)
"Plan and prepare for every possibility, and you will never act. It is nobler to have courage as we stumble into half the things we fear than to analyse every possible obstacle and begin nothing. Great things are achieved by embracing great dangers."
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