14 min
⚡⚛ My chat (+transcript) with Steve Obenschain of LaserFusionX on laser fusion Faster, Please! — The Podcast
-
- Technology
As private and government interest in nuclear fusion technology grows, an array of startups have arisen to take on the challenge, each with their own unique approach. Among them: LaserFusionX. Today on Faster, Please!—The Podcast, I talk with CEO Stephen Obenschain about the viability of fusion energy, and what sets his approach apart.
Obenschain is the president of LaserFusionX. He was formerly head of the Plasma Physics Division branch at the U.S. Naval Research Laboratory.
In This Episode
* Viability of commercial fusion (0:58)
* The LaserFusionX approach (7:54)
* Funding the project (10:28)
* The vision (12:52)
Below is a lightly edited transcript of our conversation
Viability of commercial fusion (0:58)
Pethokoukis: Steve, welcome to the podcast.
Obenschain: Okay, I'm glad to talk with you. I understand you're very interested in high-tech future power sources, not so high tech right now are windmills…
Well, I guess they're trying to make those more high tech, as well. I recall that when the Energy Department, the National Ignition Laboratory [NIF], they had the—I guess that's over about maybe 15 months ago—and they said they had achieved a net gain nuclear fusion, using lasers, and the energy secretary made an announcement and it was a big deal because we had never done that before by any means. But I remember very specifically people were saying, “Listen, it's a great achievement that we've done this, but using lasers is not a path to creating a commercial nuclear reactor.” I remember that seemed to be on the news all the time. But yet you are running a company that wants to use lasers to create a commercial fusion reactor. One, did I get that right, and what are you doing to get lasers to be able to do that?
I don't know why people would come to that conclusion. I think we are competitive with the other approaches, which is magnetic fusion, where you use magnetic fields to confine a plasma and get to fusion temperatures. The federal government has supported laser fusion since about 1972, starting with the AEC [Atomic Energy Commission]. Originally it was an energy program, but it has migrated to being in support stockpiled stewardship because, with laser fusion, you can reach physics parameters similar to what occur in thermonuclear weapons.
Yeah. So that facility is about nuclear weapons testing research, not creating a reactor—a fusion reactor.
Yeah. All that being said, it does advance the physics of laser fusion energy, and what the National Ignition Facility did is got so-called ignition, where the fuel started a self-sustaining reaction where it was heating itself and increasing the amount of fusion energy. However, the gain was about three, and one of the reasons for that is they use so-called indirect drive, where the laser comes in, heats a small gold can, and the X-rays from that then that drive the pellet implosion, which means you lose about a factor of five in the efficiency. So it's limited gain you get that way.
Your way is different. It sort of cuts out the middleman.
Okay. The better way to go—which, we're not the only ones to do this—is direct drive, where the laser uniformly illuminates the target at the time that Livermore got started with indirect drive, we didn't have the technologies to uniformly illuminate a pellet. First at NRL [Naval Research Laboratories], and then later at University of Rochester in Japan, they developed techniques to uniformly illuminate the pellets. The second thing we're doing is using the argon fluoride laser. The argon fluoride laser has been used in lithography for many years because it's deep UV.
The unique thing we have been trying to do—this was when I was supervising the program at the Naval Research Laboratory—was to take it up to high energy. We started years ago with a similar Krypton fluoride laser, built the largest operating target shooter with that technology, demonstrated the high repetition rate operation that you need for energy an
As private and government interest in nuclear fusion technology grows, an array of startups have arisen to take on the challenge, each with their own unique approach. Among them: LaserFusionX. Today on Faster, Please!—The Podcast, I talk with CEO Stephen Obenschain about the viability of fusion energy, and what sets his approach apart.
Obenschain is the president of LaserFusionX. He was formerly head of the Plasma Physics Division branch at the U.S. Naval Research Laboratory.
In This Episode
* Viability of commercial fusion (0:58)
* The LaserFusionX approach (7:54)
* Funding the project (10:28)
* The vision (12:52)
Below is a lightly edited transcript of our conversation
Viability of commercial fusion (0:58)
Pethokoukis: Steve, welcome to the podcast.
Obenschain: Okay, I'm glad to talk with you. I understand you're very interested in high-tech future power sources, not so high tech right now are windmills…
Well, I guess they're trying to make those more high tech, as well. I recall that when the Energy Department, the National Ignition Laboratory [NIF], they had the—I guess that's over about maybe 15 months ago—and they said they had achieved a net gain nuclear fusion, using lasers, and the energy secretary made an announcement and it was a big deal because we had never done that before by any means. But I remember very specifically people were saying, “Listen, it's a great achievement that we've done this, but using lasers is not a path to creating a commercial nuclear reactor.” I remember that seemed to be on the news all the time. But yet you are running a company that wants to use lasers to create a commercial fusion reactor. One, did I get that right, and what are you doing to get lasers to be able to do that?
I don't know why people would come to that conclusion. I think we are competitive with the other approaches, which is magnetic fusion, where you use magnetic fields to confine a plasma and get to fusion temperatures. The federal government has supported laser fusion since about 1972, starting with the AEC [Atomic Energy Commission]. Originally it was an energy program, but it has migrated to being in support stockpiled stewardship because, with laser fusion, you can reach physics parameters similar to what occur in thermonuclear weapons.
Yeah. So that facility is about nuclear weapons testing research, not creating a reactor—a fusion reactor.
Yeah. All that being said, it does advance the physics of laser fusion energy, and what the National Ignition Facility did is got so-called ignition, where the fuel started a self-sustaining reaction where it was heating itself and increasing the amount of fusion energy. However, the gain was about three, and one of the reasons for that is they use so-called indirect drive, where the laser comes in, heats a small gold can, and the X-rays from that then that drive the pellet implosion, which means you lose about a factor of five in the efficiency. So it's limited gain you get that way.
Your way is different. It sort of cuts out the middleman.
Okay. The better way to go—which, we're not the only ones to do this—is direct drive, where the laser uniformly illuminates the target at the time that Livermore got started with indirect drive, we didn't have the technologies to uniformly illuminate a pellet. First at NRL [Naval Research Laboratories], and then later at University of Rochester in Japan, they developed techniques to uniformly illuminate the pellets. The second thing we're doing is using the argon fluoride laser. The argon fluoride laser has been used in lithography for many years because it's deep UV.
The unique thing we have been trying to do—this was when I was supervising the program at the Naval Research Laboratory—was to take it up to high energy. We started years ago with a similar Krypton fluoride laser, built the largest operating target shooter with that technology, demonstrated the high repetition rate operation that you need for energy an
14 min