Historical research guide · 0369 · 2010

DIRD Positron Aerospace Propulsion

DIA / AAWSAP contractor

In one minute

This is the antimatter entry in the thirty-eight-document reading list Hal Puthoff administered for the Defense Intelligence Agency, and it is an engineering paper rather than a survey. Its author takes the highest energy density any known material offers — a microgram of positrons annihilates to 180 megajoules, ten orders of magnitude above chemical fuel, with a hundred percent conversion of mass into electromagnetic energy — and works out what aircraft and spacecraft you could actually build with it. Gamma rays heat tungsten shells, the shells heat air, and the same engine runs as turbojet and ramjet: 150 micrograms would carry a small drone non-stop around the world. A spaceplane reaching orbit needs 86.9 milligrams and lifts off 43 percent lighter than its chemical twin. Mars needs tens of milligrams. The paper is candid that everything turns on two numbers nobody has yet reached: how many positrons a year you can make, and how long you can keep them. Storage stands at ten microseconds; propulsion needs months.

Connection

Chapter 1's evidence ladder rests on what the government actually commissioned, and this is the page of that list where the incumbent architecture — eject mass, gain momentum — is pushed to its physical ceiling by an author who states the ceiling plainly. Read alongside DIRD 15, Puthoff’s spacetime-metric propulsion paper, it shows the same programme costing out both roads at once: the best possible fuel, and no fuel at all.

From the source

Positron annihilation releases 180 megajoules per microgram — ten orders of magnitude more specific energy than chemical fuel — and converts one hundred percent of the mass into electromagnetic energy, with matter and antimatter properties tested identical to roughly one part in ten million.Antimatter, p. 1; Figure 1
Unlike antiprotons and fission, positron annihilation produces only 511 keV gamma rays, which cannot make residual radioactivity in surrounding air or containment vessels, evolves in nanoseconds under predictable electromagnetic forces, and can therefore be throttled.Antimatter, pp. 1–2; Positron-Powered Rockets, p. 11
In a positron turbojet-ramjet engine gamma rays heat concentric tungsten shells and the shells heat the airflow by convection, so the volume a combustion engine spends on burning is spent on heat transfer instead; a 60-kilogram unmanned aircraft with a lift-to-drag ratio of four could circumnavigate Earth on 150 micrograms of positrons.Positron Air-Breathing Propulsion, pp. 2–5; Figures 3, 4 and 6
A positron-powered single-stage reusable vehicle with the same 60,500-kilogram dry mass as a chemical design carries 176,000 kilograms of propellant instead of 368,300, a gross lift-off weight 43 percent lower, and reaches low Earth orbit on a total positron budget of 86.9 milligrams.Tables 1, 2 and 3, pp. 9–10
Three rocket architectures were carried to a full performance comparison for a one-way Mars transit at delta-V of 3.7 kilometres per second: solid core at 650 to 920 seconds specific impulse and 6 to 9 milligrams of positrons, gas core at 1,000 to 2,500 seconds and under 25 milligrams, and a modified Sanger ablation photon rocket at 1,200 to 3,000 seconds and 15 to 40 milligrams.Table 5, p. 17
Positronium stabilised in crossed magnetic and electric fields inside 20-nanometre silica aerogel voids has been held for up to 10 microseconds in the laboratory, with 61 milliseconds predicted for 1,000-nanometre voids; the months-to-years lifetimes propulsion needs wait on oscillating gradient electric fields to keep the atoms off the trap walls.Long-Term Storage of Positronium, pp. 25–27; Conclusions, p. 27

The way in

https://documents2.theblackvault.com/documents/dia/AAWSAP-DIRDs/DIRD_08-DIRD_Positron_Aerospace_Propulsion.pdf

Historical source-access record. This guide links to the original; it does not reproduce the paper text.

Defense Intelligence Reference Document, Acquisition Threat Support. DIA-08-1003-002, 2 March 2010 (ICOD: 1 December 2009), produced under the Defense Intelligence Agency Advanced Aerospace Weapon System Applications (AAWSA) Program. Released under FOIA and published by The Black Vault. AUTHOR. Withheld under FOIA exemption (b)(6), and the preparing office under 10 USC 424. Internal evidence points to Gerald A. Smith of Positronics Research LLC — twenty-two of the seventy-six endnotes are his own AFRL and NIAC final reports, every figure is credited to Positronics Research LLC, the paper says the silicon carbide ablation material was ‘developed at Penn State University by the author and coworkers’, and it describes the 2000 NASA antimatter cost study as one ‘on which this author collaborated’ — but the released copy names no one, so this is an inference and not an attribution. TEXT. Full text below, pages v to 27. The document carries a copyright warning against further dissemination of its photographs, so the twenty-two figures are not reproduced; their captions are kept because several carry the engineering. Table 6, the positron and antiproton cost table, is too damaged in the scan to reproduce faithfully — its two legible figures, 333 dollars per joule and 0.004 dollars per joule, appear in the prose that follows it and are kept there. Micro symbols, exponents and delta-V symbols mangled by the scan are restored; inequality signs are written out in words so the page renders; nothing else is changed.

How to cite it

DIA / AAWSAP contractor (2010) DIRD Positron Aerospace Propulsion https://documents2.theblackvault.com/documents/dia/AAWSAP-DIRDs/DIRD_08-DIRD_Positron_Aerospace_Propulsion.pdf

Where it sits in the curriculum

The reference documents and the institutional record