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It is possible to create a pulsed plasma rocket based on thermal modeling.

Thermal Modeling of a Pulsed Plasma Rocket Shows It Should Be Possible To Create One

We’ve reported on a technology called pulsed plasma rockets (PPRs) here at UT a few times. Several research groups have worked on variations of them. They are so popular partly because of their extremely high specific impulse and thrust levels, and they seemingly solve the trade-off between those two all-important variables in space exploration propulsion systems. Essentially, they are an extremely efficient propulsion methodology that, if scaled up, would allow payloads to reach other planets in weeks rather than months or years. However, some inherent dangers still need to be worked out, and overcoming some of those dangers was the purpose of a NASA Institute for Advanced Concepts (NIAC) project back in 2020.

Originally granted to Howe Industries, a design shop that has received several NIAC grants (including two in 2020 itself), the purpose of this project was to model the design of a fully functional PPR in modeling software to see if the necessary materials and power systems are available for a rocket that can provide 100 kN of thrust and over 5,000 seconds of specific impulse.

In essence, a PPR takes a fuel pellet made out of some form of fissionable material (in this case, uranium), and zaps it into a plasma, then emits the plasma out the back for a forceful thrust. Rockets with this design can carry much less fuel than standard chemical rockets, but their design must be significantly larger due to the heating constraints put on the system by creating the plasma in the first place.

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SciShow discusses a scaled down version of the PPR proposed in the paper.
Credit – SciShow Space

Those heating constraints were one of the Phase I NIAC study’s main focal points in 2020. In particular, this study focused on analyzing the barrel the fuel pellet is released into to see if it could withstand the extreme temperatures created by handling a plasmatized uranium pellet.

To do this modeling, the team at Howe Industries used a modeling software called MCNP6 to check where particles went in the system and thereby calculate how much heat would be collected on other parts of the system where it wasn’t desired. MCNP6 uses a Monte Carlo simulation methodology, which calculates where neutrons will be created from the fission reaction that makes the plasma and where those neutrons will impact the rest of the spacecraft.

Those plasmas would have to be created about once every second, according to the calculations done by Howe Industries, and each pulse must reach an energy level of around 1 keV – much smaller than industrial-level nuclear fission reactors but a relatively high number for a spacecraft propulsion system. That energy is turned into heat, and while some of the heat is effectively used to eject the plasmatized uranium out as a thrust propellant, the rest is absorbed by other parts of the system.

Troy Howe, one of the paper’s authors, discusses his research into the PPR.
Credit – Interstellar Research Group YouTube Channel

The barrel was a part of that system that is particularly important in these thermal calculations. The modeled barrel was made out of low-enriched uranium but of a different type than the projectile, allowing the energy to heat the projectile and not the barrel itself. However, a small part of the barrel would be made of highly enriched uranium, allowing for rapid plasma propagation in an otherwise relatively stable system.

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That’s not to say that none of the heat generated by the fission reaction would end up in the barrel. Still, by the author’s calculations as part of their final report, an active cooling system should be enough to lower the temperature to a point where at least the barrel itself wouldn’t melt. Other parts of the system, such as the nozzle and a rotating drum that helps handle the fuel pellet, will be modeled in future work.

Additional future work would include building benchtop prototypes of these systems to test them out, though the prospect of working with highly enriched uranium as part of this process seems daunting. However, NIAC hasn’t yet funded a Phase II study of the PPR system, so for now, it is resigned to a nicely modeled project and another step forward in an idea that has plenty of history. Maybe someday, it will find its time to shine.

Learn More:
Howe et al. – Pulsed plasma rocket- developing a dynamic fission process for high specific impulse and high thrust propulsion
UT – Magnetic Fusion Plasma Engines Could Carry us Across the Solar System and Into Interstellar Space
UT – Plasma Thruster Could Dramatically Cut Down Flight Times to the Outer Solar System
UT – Plasma Rocket Could Help Pick Up Space Trash

Lead Image:
Model of the PPR design proposed in the paper.
Credit – Howe et al.

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Is now the right time to invest in gold as prices have cooled?

Now may be the time to buy gold following a recent lull in its price.

Getty Images/iStockphoto

The price of gold has climbed to record highs recently and has remained strong through much of April. And, that growth continued until the precious metal traded at around $2,390 per ounce on April 19, 2024. But since, growth in the price of the precious metal has cooled, with gold’s price now hovering around $2,300 per ounce.

This lull in gold’s price may represent an investment opportunity.

In general, investing is centered around buying assets when prices are low and selling them when prices are high – generating a profit on the difference between the two. So, considering the declines in gold’s price over the past few days, now may be the time to make your investment. But is buying gold during this lull in prices really a good idea?

Compare your gold investment options among leading brokers now.

Gold prices have cooled. Should you buy in now?

With gold’s price down from recent highs, you may be wondering if now is the right time to buy in. There are several reasons the dip in gold’s price may represent an opportunity to buy. Here are some of the biggest:

Prices may rise again

If looking at a gold price chart shows anything for certain, it shows that changes in the overall growth of the medal come in fits and spurts. Periods of price growth are typically followed by periods of declines and vice versa.

But with inflation rising in recent months – and with gold’s reputation as a safe-haven asset that can hedge against inflation – it only makes sense that the price of the precious metal will eventually start to head up again in the future. While attempting to time that directional change may be tricky, buying the precious metal while the price is down gives you the opportunity to take advantage of any upward movement that may be ahead.

Add gold to your portfolio now before prices have a chance to rise.

You may be able to make a quick profit

Gold isn’t known as an asset in which you can earn a quick return, but in today’s market, that may be the case. Don’t forget that in January, gold was trading at just $2,000 per ounce. And, by mid-April, the commodity’s price had climbed to around $2,400 per ounce. That’s about 20% growth in a matter of months, much of which happened since March 1 – an impressive climb for any investment asset.

Perhaps more importantly, gold’s price growth through the beginning of 2024 shows that the commodity doesn’t have to be a buy and hold style investment that you keep in a safety deposit box or precious metal depository for years to come. There’s also the possibility that the commodity’s price could climb further ahead, making it a compelling way to potentially generate a quick profit.

There are other benefits of investing in gold

There are other benefits of investing in gold that have little to do with the price growth seen thus far in 2024 – or the lull in prices seen over the past couple of days. Those benefits include:

Inflation protection: Gold has long been considered an inflation hedge, and for good reason. When inflation drives the prices of consumer goods and services up – and the value of the dollar down – gold’s price tends to rise. So, it could be used to maintain the value of your portfolio during inflationary economic conditions. That’s important in today’s economic environment as stubborn inflation continues to weigh on the value of the dollar.
Portfolio diversification: Gold’s price doesn’t always move in the same pattern that bonds or stocks do. So, mixing a reasonable amount of gold into your portfolio (up to 10% of your portfolio assets) as a diversifier could protect you from losses should one or more of your traditional portfolio assets fall in value. “If you have less than 5% – 10% of your net worth in commodities & FX (forex), you should absolutely consider adding exposure to gold and other precious metals,” says Vijay Marolia, money manager and managing partner at the wealth management firm, Regal Point Capital.

The bottom line

Gold’s price has fallen from recent highs – which may represent an opportunity to tap into growth ahead. However, gold isn’t simply a “buy while it’s low and sell while it’s a high” kind of investment opportunity. The commodity can also protect your portfolio from the stubborn inflation we’ve seen thus far in 2024 while acting as a diversification tool that could increase your risk-adjusted portfolio returns. So, consider adding gold to your portfolio today while it has the potential to grow in value.

Joshua Rodriguez

Joshua Rodriguez is a personal finance and investing writer with a passion for his craft. When he’s not working, he enjoys time with his wife, two kids, two dogs and two ducks.