PeeD
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On the nuclear technology day, Iran officially disclosed the history and structure of its gas centrifuge program.
I will lay out the extracted details here:
IR1: First generation production URENCO machine (3-4 generation Zippe design), via Pakistans P1. Relative small diameter aluminium rotor but mechanically advanced 4-Rotor design.
IR2: Larger diameter 2-rotor design based on Urenco second generation design, via Pakistans P2. Unlike Pakistan, Iran could not import the maraging steel rotors and bellows. This lead to discontinuing this path.
IR3: Two stage maraging steel rotor of the IR2 was replaced with a increased length single rotor carbon fiber rotor.
IR2M: After mastering IR3 single rotor design, a 2-rotor variant was mastered via functioning carbon fiber bellows. Resulting in a design that was basically a 2nd gen. Urenco centrifuge (P2) but with faster spinning carbon fiber rotos.
IR4: Probably a 2-rotor variant of the IR3, run in parallel to the IR2M program. Despite increased rotor length compared to the IR2M, producebility and lower speed, gave it no advantage over the IR2M.
IR5: Ambitious 3-4 rotor design. The first after the IR1 (which was extensively studied for two decades to master the difficulties of such designes). Difficulties with mastering producibility of such a advanced design, lead to a generation of larger diameter machines.
IR6S: Larger diameter design. To master the larger diameter this design is single rotor (S for short). Its performance is not better than the mature IR2M.
IR6: 2-rotor variant of the IR6S. It has the same enrichment capability as the complex IR5 but as the IR2M was well mastered and sufficiently mature. It got twice as powerful as the IR2M.
IR7: 3-4 rotor variant of the IR6. After the IR1 and IR5, this became the 3rd 3-rotor design. Its early success lead to a direct jump to a next generation design, the IR8.
IR8: After the success with the IR7 prototype, this was the first machine that skipped single and twin rotor steps and directly went for a 3-4 rotor design (indicating that problems regarding 3-4 rotor machines have been understood and mastered).
In terms of diameter, this is the 4th generation of Iranian machines and mastering the larger diameter is the main hurdle of the IR8.
The IR8 will be the final machine for the industrial scale work, performing at ~24-times the level of the "industrial scale" IR1.
This is the machine that will give Iran a latent nuclear capability, as a small number of such powerful machines in a nuclear-hardened enrichment facility will be able to enrich HEU in days from LEU.
The key issue now is mastering a production variant of the IR8 that has a sufficiently long life-time. Since this mastering of producibility is so difficult, it can be expected to be ready in 2-5 years, at the end of the Barjam/JCPOA restrictions.
As for now, the production ready machines in Iran are:
IR1 (2000 production but perfected only in 2010-2015)
IR2M (mastered 2010-2015)
IR6 (mastered 2015-2020)
Current state of the art URENCO machines operate ~4-times better than the IR8. But for a latent HEU enrichment capability IR8 is sufficient. At nuclear-strike resistent Fordow, a 2000 machine cascade of IR8 could produce several warheads worth of HEU withing a few days after the order is given.
I hope to see a high-grade carbon fiber mass production line becoming operational for the IR8 to enable serial production in the 2020-2025 time frame.
I will lay out the extracted details here:
IR1: First generation production URENCO machine (3-4 generation Zippe design), via Pakistans P1. Relative small diameter aluminium rotor but mechanically advanced 4-Rotor design.
IR2: Larger diameter 2-rotor design based on Urenco second generation design, via Pakistans P2. Unlike Pakistan, Iran could not import the maraging steel rotors and bellows. This lead to discontinuing this path.
IR3: Two stage maraging steel rotor of the IR2 was replaced with a increased length single rotor carbon fiber rotor.
IR2M: After mastering IR3 single rotor design, a 2-rotor variant was mastered via functioning carbon fiber bellows. Resulting in a design that was basically a 2nd gen. Urenco centrifuge (P2) but with faster spinning carbon fiber rotos.
IR4: Probably a 2-rotor variant of the IR3, run in parallel to the IR2M program. Despite increased rotor length compared to the IR2M, producebility and lower speed, gave it no advantage over the IR2M.
IR5: Ambitious 3-4 rotor design. The first after the IR1 (which was extensively studied for two decades to master the difficulties of such designes). Difficulties with mastering producibility of such a advanced design, lead to a generation of larger diameter machines.
IR6S: Larger diameter design. To master the larger diameter this design is single rotor (S for short). Its performance is not better than the mature IR2M.
IR6: 2-rotor variant of the IR6S. It has the same enrichment capability as the complex IR5 but as the IR2M was well mastered and sufficiently mature. It got twice as powerful as the IR2M.
IR7: 3-4 rotor variant of the IR6. After the IR1 and IR5, this became the 3rd 3-rotor design. Its early success lead to a direct jump to a next generation design, the IR8.
IR8: After the success with the IR7 prototype, this was the first machine that skipped single and twin rotor steps and directly went for a 3-4 rotor design (indicating that problems regarding 3-4 rotor machines have been understood and mastered).
In terms of diameter, this is the 4th generation of Iranian machines and mastering the larger diameter is the main hurdle of the IR8.
The IR8 will be the final machine for the industrial scale work, performing at ~24-times the level of the "industrial scale" IR1.
This is the machine that will give Iran a latent nuclear capability, as a small number of such powerful machines in a nuclear-hardened enrichment facility will be able to enrich HEU in days from LEU.
The key issue now is mastering a production variant of the IR8 that has a sufficiently long life-time. Since this mastering of producibility is so difficult, it can be expected to be ready in 2-5 years, at the end of the Barjam/JCPOA restrictions.
As for now, the production ready machines in Iran are:
IR1 (2000 production but perfected only in 2010-2015)
IR2M (mastered 2010-2015)
IR6 (mastered 2015-2020)
Current state of the art URENCO machines operate ~4-times better than the IR8. But for a latent HEU enrichment capability IR8 is sufficient. At nuclear-strike resistent Fordow, a 2000 machine cascade of IR8 could produce several warheads worth of HEU withing a few days after the order is given.
I hope to see a high-grade carbon fiber mass production line becoming operational for the IR8 to enable serial production in the 2020-2025 time frame.
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