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How to Read MPCVD "Generations": The Eight Parameters That Actually Change, and ENTASK's Confirmed Facts by Generation

"Generation N" has no standard definition in the MPCVD industry - it is each vendor's internal naming, not an industry norm. So asking "which generation is this" yields nothing comparable. The question to ask concerns the eight parameters that genuinely change between generations: microwave frequency and power-source architecture, chamber topology, microwave power, growth-area diameter and crystal growth height, thermal-field and chamber-pressure control precision, control and monitoring architecture, reliability definitions, and single-run yield with batch consistency. This article sets out those criteria and how to verify each, then lists ENTASK's CONFIRMED facts by generation: Gen-2 (entered production 2024, over 300 carats total output, rough thickness reaching 10 mm), Gen-4 (the 10 kW series), and the Gen-4.5 and Gen-5 currently offered (in-house E-MG010K at 2450 MHz, 10 kW / 15 kW; 10 kW gives a 92 mm growth area with 12 mm crystal growth height, 15 kW a 120 mm growth area). It closes with an item-by-item Gen-4 / Gen-4.5 / Gen-5 comparison (growth stage 92 / 102 / 120 mm, maximum growth thickness 12 / 15 / 15 mm, 14 / 20 stones per run, 200 / 300 ct monthly) and flags one inconsistency for the company to settle (Gen-4.5 at 102 mm by generation versus 92 / 120 mm by power); public technical detail on Gen-1 and Gen-3 is genuinely missing, and this article does not fill that gap with conjecture.

MPCVD SystemsPublished 2026-07 · Updated 2026-07-26 · 9 min

01First, Be Clear: "Generation N" Is Vendor Naming, Not an Industry Standard

In MPCVD, no standards body has ever defined what "generation N" means. Each vendor numbers its internal platforms by its own development cadence, and the same "Gen-5" at two vendors may correspond to entirely different power classes, chamber topologies and control architectures. That has a practical consequence: comparing generation labels across vendors is meaningless, and even within one vendor the steps are uneven - one generational gap may be only a control-system upgrade while another is a change of chamber topology. So the right question in a procurement conversation is not "which generation is this" but a translation of the label into parameters: relative to the previous generation, which parameter changed, by how much, and why does that change matter for my product. The eight items below are that translation table. They double as an on-site verification checklist, with a "how to verify" note on each, because the numbers on a specification sheet and the numbers a line can reproduce reliably are frequently not the same.

02Parameters One to Four: The Physical Conditions That Set How Large You Can Grow

**One: microwave frequency and power-source architecture.** The mainstream bands are 2.45 GHz and 915 MHz: the longer wavelength of 915 MHz supports a larger plasma scale but demands more of the site, utilities and safety design. Power sources further divide into magnetron and solid-state, which affects power stability and service life. How to verify: require the frequency, source type and model number, plus that model's power-stability specification. **Two: chamber topology.** Bell-jar, ellipsoidal, clamshell and annular-slot-antenna designs set plasma shape and the ceiling on uniformity - the hardest difference between generations, since changing topology essentially means changing platform. How to verify: inspect the chamber and design drawings, and ask which topology and why. **Three: microwave power.** Power means something only when quoted together with growth area; a kW figure alone does not convert into capacity. **Four: growth-area diameter and crystal growth height.** These two must be asked together: growth area determines how many seeds fit in one run, while growth height determines how thick a single crystal can grow - the first governs output, the second governs whether large-carat polished stones can be cut. How to verify: require the pair "growth-area diameter at a stated power, and crystal growth height under that condition", not a single vague range.

03Parameters Five to Eight: The Control Conditions That Determine Reproducibility

**Five: thermal-field and chamber-pressure control precision.** Chamber-pressure stability directly affects growth-interface stability and stress, making it a leading indicator of yield. How to verify: do not accept the nominal figure alone - request chamber-pressure logs across consecutive runs and look at the amplitude of fluctuation and any drift. **Six: control and monitoring architecture.** Moving from visual inspection through a window to multimodal in-line monitoring - plasma imaging, spectroscopy, thermal-field reconstruction - is the commonest generational upgrade and also the part most easily dressed up in marketing language. How to verify: ask for a live demonstration of the monitoring interface during an actual growth run, and establish what it actually captures, what its alarm logic is, and whether historical data can be exported. **Seven: reliability definitions.** MTBF, full-load continuous runtime, chamber-pressure stability and single-run yield may each be defined and tested differently by different vendors. How to verify: ask for the definition before looking at the number - what counts as a failure for MTBF, under what load it was measured, and whether "full-load continuous operation" means one run or a cumulative total. **Eight: single-run yield and batch consistency.** This is the metric that ultimately lands on cost, and the hardest to dress up: anyone can achieve a best-ever run once, and only what reproduces means anything. How to verify: request raw yield records across consecutive runs rather than the figure from the best run. These four together with the four in the previous section form a checklist that can be written into a technical agreement and acceptance terms.

04ENTASK's Confirmed Facts by Generation (and Where the Gaps Are)

All items below are supplied by the company and have not been independently verified; we recommend confirming each on site using the methods above. **Gen-2**: entered production in 2024, successfully produced diamond rough with total output exceeding 300 carats, marking initial process maturity; rough from this generation reached 10 mm in thickness. **Gen-4**: the 10 kW series. **Gen-4.5 and Gen-5, currently offered**: carrying the in-house E-MG010K industrial microwave power source (2450 MHz, 10 kW / 15 kW); the 10 kW configuration corresponds to a 92 mm growth area with 12 mm crystal growth height, and the 15 kW configuration to a 120 mm growth area; paired with the InsightAction and WiseAction intelligent control systems; control platform Siemens s7-1200 with Profinet and IPC vision; microwave-source MTBF over 10,000 hours, full-load continuous operation beyond 1,500 hours without failure, chamber-pressure stability of plus or minus 0.005 kPa, operating noise under 50 dB, single-run yield at or above 99%, and 200-300 carats per system per month. Gen-5 differs from Gen-4.5 in having a larger growth stage and higher per-run capacity, suiting scaled production, while Gen-4.5 balances stability against unit investment and also suits research and mid-volume work. **Item-by-item comparison of Gen-4 / Gen-4.5 / Gen-5** (company figures; see the generational comparison table on our MPCVD systems page): Gen-4 is the classic model with Gen-4.5 and Gen-5 in current production; all three run at 2450 MHz; power is 10 kW for Gen-4 and Gen-4.5, and 10-15 kW for Gen-5; growth-stage size is 92 mm / 102 mm / 120 mm; maximum growth thickness 12 mm / 15 mm / 15 mm; standard product 20x15x9.5 mm / 21x17x9.7 mm / 24x18x10 mm single crystal; output per run 14 stones / 20 stones / per configuration; monthly capacity 200 ct / 300 ct / per configuration (per system); and microwave-source MTBF above 10,000 hours across all three. One inconsistency worth flagging for the company to settle: the table above states growth-stage size BY GENERATION (Gen-4.5 at 102 mm), whereas the company's other common framing states it BY POWER (92 mm at 10 kW, 120 mm at 15 kW). The two are not contradictory - Gen-4.5 can be read as a cavity improvement to 102 mm at the same power - but having both in circulation makes the numbers look inconsistent, and a single primary framing should be chosen. **What remains missing**: no releasable public technical parameters exist for Gen-1 and Gen-3, and this article does not fill that gap with conjecture. If you need a complete Gen-1 to Gen-5 comparison, request it from the company directly; this page will be updated once releasable data is available.

05Why "Generation" Should Not Be Your Main Selection Criterion

Back to the opening judgement: the label is not an industry standard, so it cannot carry the function of cross-vendor comparison. What actually determines what you can make is how the eight parameters above combine AT YOUR TARGET SPECIFICATION - and that combination can only be assessed once the target product is fixed: rough size band and grade, optical part size and thickness, heat spreader area and thickness. A common selection error is to start from power rating and generation label and work forward to what is possible. The correct order is the reverse: fix the target product and monthly output first, work back to the required growth area, growth height, yield and stability figures, and only then compare which vendor's configuration can supply verifiable evidence on those figures. A further suggestion is to treat "builds its own equipment" as a verifiable item rather than a slogan - request the microwave source model and bill of materials, check whether the patent applications cover the equipment itself rather than only the material, and establish the source and lead time for spares and engineering response. For the full set of criteria see our MPCVD system selection guide on this site, and for the buyer-side verification checklist see our article on verifying a claimed rough size.

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