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Could powerful lasers power a working reactor?

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Could powerful lasers power a working reactor?
Damien Jemison A technician adjusts some of the optical equipment of the National Ignition Facility.Damien Jemison

The National Ignition Facility in California uses powerful lasers to spark fusion reactions

Deep under the Nevada desert in the 1980s the US conducted secret nuclear weapons research.

Among the experiments was an effort to see if nuclear fusion, the reaction which powers the sun, could be sparked on earth in a controlled setting.

The experiments were classified, but it was widely known among physicists that the results had been promising.

That knowledge caught the attention of two young graduate students working at the Los Alamos National Laboratory in the late 2000s, Conner Galloway and Alexander Valys.

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The Los Alamos lab was originally set up in 1943 as a top-secret site to develop the first nuclear weapons. Located near Santa Fe, New Mexico it is now a US government research and development facility.

“When Alex and I learned about those tests at Los Alamos, our reaction was like ‘wow, inertial fusion has already worked!’. Laboratory-scale pellets were ignited, the details were classified, but enough was made public that we knew that ignition was achieved,” says Mr Galloway.

Nuclear fusion is the process of fusing hydrogen nuclei together, which produces immense amounts of energy. The reaction creates helium and not the long-lived radioactive waste of the fission process which is used in existing nuclear power stations.

If fusion can be harnessed, then it promises abundant electricity, generated without producing CO2.

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Those tests in the 1980s led to the US government building the National Ignition Facility (NIF) in California, a project to see if nuclear fuel pellets could be ignited using a powerful laser.

After more than a decade of work, in late 2022 researchers at NIF made a breakthrough. Scientists conducted the first controlled fusion experiment to produce more energy from the reaction than that supplied by the lasers which sparked it.

A graphic showing the fusion reaction

While physicists around the world marvelled at that breakthrough, it had taken the scientists at NIF much longer than expected.

“They were energy starved,” says Mr Galloway.

He doesn’t mean they needed more snacks, instead the NIF laser was only just powerful enough to ignite the fuel pellet.

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Mr Galloway and Mr Valys think that more powerful lasers will make it possible to build a working fusion reaction that can supply electricity to the power grid. To do that they founded Xcimer, based in Denver.

NIF had to make do with a laser that could pump out two megajoules of energy. Mr Galloway and Mr Valys are planning to experiment with lasers that can supply up to 20 megajoules of energy.

“We think 10 to 12 [megajoules] is the sweet spot for a commercial power plant,” says Mr Galloway.

Such a laser beam would hit the fuel capsule with a powerful punch. It would be like taking the energy of a 40-tonne articulated lorry travelling at 60mph and focussing it on the centimetre-sized capsule for a few billionths of a second.

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More powerful lasers will allow Xcimer to use larger and simpler fuel capsules than NIF, which found it difficult to perfect them.

Xcimer Conner Galloway (left) and Alexander Valys stading in the big empty factory which will one day house their laser-based fusion project.Xcimer

Conner Galloway (left) and Alexander Valys founders of fusion firm Xcimer

Xcimer joins dozens of other organisations around the world trying to build a working fusion reactor.

There are two main approaches. Smashing a fuel pellet with lasers falls under the category of inertial confinement fusion.

The other way, known as magnetic confinement fusion, uses powerful magnets to trap a burning cloud of atoms called plasma.

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Both approaches have daunting engineering challenges to overcome.

In particular, how do you extract the heat generated during fusion so you can do something useful with it, like drive a turbine to make electricity?

“I suppose my scepticism is, I haven’t yet even seen a persuasive conceptual diagram of how you manage the process of taking energy out while keeping the fusion reaction going,” says Prof Ian Lowe at Griffith University in Australia.

He has spent his long career working in energy research and policy. While Prof Lowe supports the development of fusion technology, he just argues that a working fusion reactor won’t come fast enough to help bring down CO2 emissions and tackle climate change.

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“My concern is that even the most optimistic view is that we’d be lucky to have commercial fusion reactors by 2050. And long before then we need to have decarbonized the energy supply if we’re not going to melt the planet,” he says.

Another challenge is that the fusion reaction produces high energy particles that will degrade steel, or any other material that lines the reactor core.

Getty Images A truck exits the Los Alamos national laboratory, in New Mexico. A sign in the foreground says: "No Trespassing."Getty Images

Secret fusion tests were conducted at the Los Alamos National Laboratory in the 1980s

Those in the fusion industry don’t deny the engineering challenges, but feel they can be overcome.

Xcimer plans to use a “waterfall” of molten salt flowing around the fusion reaction to absorb the heat.

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The founders are confident that they can fire the lasers and replace the fuel capsules (one every two seconds) while keeping that flow going.

The flow of molten salt will also be thick enough to absorb high energy particles that could potentially damage the reactor.

“We just have two relatively small laser beams coming in from either side [of the fuel pellet]. So you only need a gap in the flow big enough for those beams, and so you don’t have to turn off and turn on the entire flow,” says Mr Valys.

But how quickly can them make such a system work?

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Xcimer plans to experiment with the lasers for two years, before building a target chamber, where they can target the fuel pellets.

The final stage would be the working reactor, which they hope would be plugged into the electricity grid in the mid-2030s.

To fund the first phase of their work, Xcimer has raised $100m (£77m) . The money will be used to build a facility in Denver and the prototype laser system.

Hundreds of millions dollars more will be needed to build a working reactor.

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But for the founders of Xcimer, and other fusion start-ups, the prospect of cheap, carbon-free electricity is irresistible.

“You know, it’ll change the trajectory of what’s possible for humanity’s progress,” says Mr Valys.

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NASA outlines backup plan to get Starliner crew back to Earth from International Space Station if Boeing ship can’t bring them home

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NASA outlines backup plan to get Starliner crew back to Earth from International Space Station if Boeing ship can't bring them home


As NASA debates the safety of Boeing’s Starliner spacecraft in the wake of multiple helium leaks and thruster issues, the agency is “getting more serious” about a backup plan to bring the ship’s two crew members back to Earth aboard a SpaceX Crew Dragon, officials said Wednesday.

In that case — and no final decisions have been made — Starliner commander Barry “Butch” Wilmore and co-pilot Sunita Williams would remain aboard the International Space Station for another six months and come down on a Crew Dragon that’s scheduled for launch Sept. 24 to carry long-duration crew members to the outpost.

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Boeing’s Starliner spacecraft docked to the forward port of the International Space Station as the lab complex approached Egypt and the Nile delta.

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NASA


Two of the four “Crew 9” astronauts already assigned to the Crew Dragon flight would be bumped from the mission and the ship would be launched with two empty seats. Wilmore and Williams then would return to Earth next February with the two Crew 9 astronauts.

Shortly before the Crew Dragon launch, the Starliner would undock from the station’s forward port and return to Earth under computer control, without any astronauts aboard. The Crew Dragon then would dock at the vacated forward port.

Two earlier Starliner test flights were flown without crews and both landed successfully. The current Starliner’s computer system would need to be updated with fresh data files, and flight controllers would need to brush up on the procedures, but that work can be done in time to support a mid September return.

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If that scenario plays out, Wilmore and Williams would end up spending 268 days — 8.8 months — in space instead of the week or so they planned when they blasted off atop a United Launch Alliance Atlas 5 rocket on June 5.

Based on uncertainty about the precise cause of the thruster problems, “I would say that our chances of an uncrewed Starliner return have increased a little bit based on where things have gone over the last week or two,” said Ken Bowersox, NASA’s director of space operations.

“That’s why we’re looking more closely at that option to make sure that we can handle it.”

But he cautioned that no final decisions will be made on when — or how — to bring the Starliner crew home until the agency completes a top-level flight readiness review.

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No date has been set, but it could happen by late next week or the week after.

“Our prime option is to return Butch and Suni on Starliner,” said Steve Stich, manager of NASA’s Commercial Crew Program. “However, we have done the requisite planning to make sure we have other options open. We have been working with SpaceX to ensure that they’re ready to (return) Butch and Suni on Crew 9 if we need that.

“Now, we haven’t approved this plan (yet). We’ve done all the work to make sure this plan is there … but we have not turned that on formally. We wanted to make sure we had all that flexibility in place.”

Before the Starliner was launched, NASA and Boeing engineers knew about a small helium leak in the spacecraft’s propulsion system. After ground tests and analysis, the team concluded the ship could be safely launched as is.

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Starliner co-pilot Suni Williams, left, and commander Barry “Butch” Wilmore, seen during a space-to-ground news conference last month. The two astronauts are now 63 days into a missions originally expected to last a little more than one week.

NASA


The day after launch, however, four more helium leaks developed and five aft-facing maneuvering thrusters failed to operate as expected. Ever since, NASA and Boeing have been carrying out data reviews and ground tests in an effort to understand exactly what caused both issues.

The Starliner uses pressurized helium to push propellants to the thrusters, which are critical to keeping the spacecraft properly oriented. That’s especially important during the de-orbit braking “burn” using larger rocket engines to slow the ship down for re-entry and an on-target landing.

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To clear the Starliner for a piloted return to Earth, engineers must develop acceptable “flight rationale” based on test data and analyses that provides confidence the ship can make it through re-entry and landing with the required level of safety.

“The Boeing team (is) very confident that the vehicle could bring the crew home right now with the uncertainty we’ve got,” said Bowersox. “But we’ve got other folks that are probably a little more conservative. They’re worried that we don’t know for sure, so they estimate the risk higher and they would recommend that that we avoid coming home (on Starliner) because we have another option.

“So that’s a part of the discussion that we’re having right now. But again, I think both views are reasonable with the uncertainty band that we’ve got, and so our effort is trying to reduce that uncertainty.”

Boeing adamantly argues the Crew Dragon backup plan isn’t needed and that tests and analyses of helium leaks in the Starliner’s propulsion system and initial trouble with maneuvering thrusters show the spacecraft has more than enough margin to bring Wilmore and Williams safely back to Earth.

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The helium leaks are understood, Boeing says, they have not gotten worse and more than enough of the pressurized gas is on board to push propellants to the thrusters needed to maneuver and stabilize the spacecraft through the critical de-orbit braking burn to drop out of orbit for re-entry and landing.

Likewise, engineers believe they now understand what caused a handful of aft-facing maneuvering jets to overheat and fire at lower-than-expected thrust during rendezvous with the space station, causing the Starliner’s flight computer to shut them down during approach.

Ground tests of a new Starliner thruster, fired hundreds of times under conditions that mimicked what those aboard the spacecraft experienced, replicated the overheating signature, which was likely caused by multiple firings during tests of the capsule’s manual control system during extended exposure to direct sunlight.

The higher-than-expected heating likely caused small seals in thruster valve “poppets” to deform and expand, the analysis indicates, which reduced the flow of propellant. The thrusters aboard the Starliner were test fired in space under more normal conditions and all operated properly, indicating the seals had returned to a less intrusive shape.

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New procedures are in place to prevent the overheating that occurred during the rendezvous. Additional manual test firings have been ruled out, no extended exposure to the sun is planned and less frequent firings are required for station departure compared to rendezvous.

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The Starliner capsule in Boeing’s processing facility at the Kennedy Space Center. The Service Module is the white lower section housing critical helium propellant pressurization tanks and plumbing along with maneuvering thrusters in four rectangular engine pods, or “doghouses,” spaced around the exterior.

William Harwood/CBS News


In a statement Wednesday, Boeing said, “We still believe in Starliner’s capability and its flight rationale. If NASA decides to change the mission, we will take the actions necessary to configure Starliner for an uncrewed return.”

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The helium plumbing and thrusters are housed in the Starliner’s service module, which will be jettisoned to burn up in the atmosphere before the crew capsule re-enters for landing. As such, engineers will never be able to examine the hardware first hand to prove, with certainty, what went wrong.

At this point, that uncertainty appears to support bringing Wilmore and Williams back to Earth aboard the Crew Dragon. But it’s not yet a certainty.

“If we could replicate the physics in some offline testing to understand why this poppet is heating up and extruding and then why it’s contracting, that would give us additional confidence to move forward, to return Butch and Sonny on this vehicle,” Stich said.

“That’s what the team is really striving to do, to try to look at all the data and see if we can get a good physical explanation of what’s happening.”

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In the meantime, the wait for a decision, one way or the other, drags on.

“In the end, somebody – some one person – designated to be the decision maker, that person has to come to a conclusion,” Wayne Hale, a former shuttle flight director and program manager, wrote in a blog post earlier this week.

“The engineers will always always always ask for more tests, more analysis, more time to get more information to be more certain of their conclusions. The decider also has to decide when enough has been done. The rub in all of this … is that it always involves the risk to human life.”

Hale concluded his post by saying: “I do not envy today’s decision makers, the ones weighing flight rationale. My only advice is to listen thoroughly, question effectively, ask for more data when necessary. But when it is time, a decision must be made.”

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Back Market lays out its plan to make refurbished phones go mainstream

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Back Market onstage demo

Back Market held a press conference on Thursday morning in Paris to talk about upcoming product launches and give an update on the company’s current situation. If you’re not familiar with the French startup, it operates a marketplace of refurbished electronics devices — mostly smartphones. It has attracted a lot of investor cash in recent years but has also been through tougher times.

In 2021, just like many large tech companies, Back Market rode the wave of zero-interest rate policies around the world and raised an enormous amount of money: a $335 million Series D round was followed by another $510 million Series E round mere months later.

After reaching a valuation of $5.7 billion, Back Market realized that the economy was slowing down. It conducted a small round of layoffs in late 2022, telling French newspaper Les Échos it was “the best way to achieve profitability in the coming years.”

Fast-forward to Thursday’s press conference and the company was keen to demonstrate its focus is back on product launches and new projects. Back Market said it wants to find new distribution channels and go premium so that more people think about buying a refurbished device instead of a new one.

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Finding customers where they are already

Over the past 10 years, Back Market hasn’t just captured a decent chunk of the secondhand electronics market, it has expanded the market for refurbished smartphones. The pitch is simple: A refurbished device is cheaper than a new one and it’s also better for the planet. Moreover, when it comes to smartphones, it has become much harder to define why this year’s model is better than last year’s — so why shell out lots of money buying new to get only an incremental upgrade?

The company doesn’t handle smartphones and other electronic devices directly. Instead, it partners with 1,800 companies that repair and resell old devices. So it’s essentially a specialized services marketplace. Since its inception, it has sold 30 million refurbished devices to 15 million customers.

Most Back Market customers buy devices on its website or through its mobile app. But the company has recognized it’s sometimes constrained by its partners’ inventory. This is why it wants to expand supply and demand with strategic partnerships.

For instance, it’s partnering with Sony for PlayStation consoles. “A lot of people are coming to Back Market to try and purchase their PlayStation,” said co-founder and CEO Thibaud Hug de Larauze. But the issue is that Back Market is constrained when it comes to supplies for this type of device.

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While many people think about smartphone trade-ins, most people don’t think about selling their old consoles. “With this partnership with PlayStation by Sony, we are the only partner to trade in every PlayStation within Sony’s website, within the Sony PlayStation store,” he noted.

As a result, people buying a new PlayStation get a discount with trade-ins at checkout and Back Market is no longer out of stock for old PlayStation consoles. This is a good example of what Back Market has in mind for future partnerships.

Image Credits: Romain Dillet / TechCrunch

“This is one of the first [partnerships of this kind] but we really want to bring it everywhere where customers are actually shopping new. We want to get them where they are, in order to get their old tech — in order to serve it to people who want access to refurbished tech,” Hug de Larauze added.

On the smartphone front, trade-ins are already quite popular. However, customers visiting a phone store usually end up buying a new device along with a long-term plan.

Back Market is going to partner with telecom companies so that customers can also get a discount on refurbished devices in exchange for a long-term plan. The first two partners for this are Bouygues Telecom in France and Visible, a subsidiary of Verizon Wireless in the U.S.

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A new premium tier with official parts

Quality remains the main concern when it comes to buying refurbished devices. In addition to allowing returns, the company is constantly tracking the rate of faulty devices on its platform and trying to bring that number down. Back Market now has a defective rate of 4%, meaning that one in every 25 phones doesn’t work as expected in one way or another.

When customers buy a smartphone on Back Market, they can choose between a device in “fair,” “good,” or “excellent” condition. The company has now rolled out a new top tier — called “premium.”

The main difference between smartphones with no signs of use and premium refurbished devices is that Back Market certifies that premium devices have been repaired with official parts exclusively.

In addition to this new premium tier, Back Market is working on an app update to turn it into a smartphone companion. You can register your smartphone with your Back Market account to receive tips to keep your device in good shape for longer. They are also working on gamification features, including badges and rewards.

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Similarly, Back Market will make it easier to check the value of your current phone. “You open the Back Market app, you shake your phone and you’ll find out,” chief product officer, Amandine Durr, explained. This feature will launch around Black Friday.

Finally, Back Market is going to use generative AI to make it easier to browse the catalog. It can be hard to compare two smartphone models to understand which one is better for you. In a few months, you’ll be able to select two phones and get an AI-generated summary of how the two models compare.

Profitability in Europe this year

When thinking about growth potential, instead of focusing on the smartphone industry, Back Market said it draws inspiration from the car industry.

“Nine people out of 10 are purchasing a pre-owned car today,” said Hug de Larauze. “Everything has been created and lined up for that — the availability of spare parts for everyone, you’re not forced to repair your car where you purchased it.”

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Similarly, repairability is changing for smartphones and spare parts, starting with the European Union. By June 2025, manufacturers will be forced to sell their spare parts to people and companies who want to fix devices themselves.

The shift to refurbished devices is also already well underway in Europe. “Back Market is going to be profitable for the first time in Europe in 2024,” said Hug de Larauze. “This is a big milestone for us because when we created the company and until very recently… we had that label that said: ‘OK, this is an impact company.’ Impact means good feelings, but the money is not there.

“Well it’s not the case, it’s actually making money,” he added. Now, let’s see if Back Market can become the go-to destination for refurbished devices in more countries, starting with the U.S.

Image Credits: Romain Dillet / TechCrunch

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Drones setting a new standard in ocean rescue technology

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Drones setting a new standard in ocean rescue technology


Last month, two young paddleboarders found themselves stranded in the ocean, pushed 2,000 feet from the shore by strong winds and currents. Thanks to the deployment of a drone, rescuers kept an eye on them the whole time and safely brought them aboard a rescue boat within minutes.

In North Carolina, the Oak Island Fire Department is one of a few in the country using drone technology for ocean rescues. Firefighter-turned-drone pilot Sean Barry explained the drone’s capabilities as it was demonstrated on a windy day. 

“This drone is capable of flying in all types of weather and environments,” Barry said. 

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Equipped with a camera that can switch between modes — including infrared to spot people in distress — responders can communicate instructions through a speaker. It also can carry life-preserving equipment.

The device is activated by a CO2 cartridge when it comes in contact with water. Once triggered, it inflates into a long tube, approximately 26 inches long, providing distressed swimmers something to hold on to.

In a real-life rescue, after a 911 call from shore, the drone spotted a swimmer in distress. It released two floating tubes, providing the swimmer with buoyancy until help arrived.

Like many coastal communities, Oak Island’s population can swell from about 10,000 to 50,000 during the summer tourist season. Riptides, which are hard to detect on the surface, can happen at any time.

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Every year, about 100 people die due to rip currents on U.S. beaches. More than 80% of beach rescues involve rip currents, if you’re caught in one, rescuers advise to not panic or try to fight it, but try to float or swim parallel to the coastline to get out of the current.

Oak Island Fire Chief Lee Price noted that many people underestimate the force of rip currents.

“People are, ‘Oh, I’m a good swimmer. I’m gonna go out there,’ and then they get in trouble,” Price said.

For Price, the benefit of drones isn’t just faster response times but also keeping rescuers safe. Through the camera and speaker, they can determine if someone isn’t in distress.

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Price said many people might not be aware of it. 

“It’s like anything as technology advances, it takes a little bit for everybody to catch up and get used to it,” said Price.

In a demonstration, Barry showed how the drone can bring a safety rope to a swimmer while rescuers prepare to pull the swimmer to shore.

“The speed and accuracy that this gives you … rapid deployment, speed, accuracy, and safety overall,” Price said. “Not just safety for the victim, but safety for our responders.”

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Netflix teases its animated Splinter Cell series

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Netflix teases its animated Splinter Cell series

It’s been quite some time since we heard anything about Netflix’s animated adaptation of Splinter Cell — but the streamer has finally provided some details on the show. The reveal comes in the form of a very brief teaser trailer, which shows a little bit of the show, but mostly showcases Liev Schreiber’s gravelly take on lead character Sam Fisher. We also have a proper name now: it’s called Splinter Cell: Deathwatch.

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Horseshoe crabs: Ancient creatures who are a medical marvel

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Horseshoe crabs: Ancient creatures who are a medical marvel


Horseshoe crabs: Ancient creatures who are a medical marvel – CBS News

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Correspondent Conor Knighton visits New Jersey beaches along the Delaware Bay to learn about horseshoe crabs – mysterious creatures that predate dinosaurs – whose very blood has proved vital to keeping humans healthy by helping detect bacterial endotoxins. He talks with environmentalists about the decline in the horseshoe crab population, and with researchers who are pushing the pharmaceutical industry to switch its use of horseshoe crab blood with a synthetic alternative used in medical testing.

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NYT Strands today — hints, answers and spangram for Friday, September 20 (game #201)

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NYT Strands homescreen on a mobile phone screen, on a light blue background

Strands is the NYT’s latest word game after the likes of Wordle, Spelling Bee and Connections – and it’s great fun. It can be difficult, though, so read on for my Strands hints.

Want more word-based fun? Then check out my Wordle today, NYT Connections today and Quordle today pages for hints and answers for those games.

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