physics

Greg Hammett

Greg Hammett is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Greg Hammett rather than just read about it. In short: Gregory Wayne Hammett is an American plasma physicist, who is a professor at the Department of Astrophysical Sciences at Princeton University and a principal research scientist at the Princeton Plasma Physics Laboratory. Known for his computational and theoretical studies on plasma turbulence, he received the James Clerk Maxwell Prize for Plasma Physics alongside his former doctoral student Bill Dorland in 2024 "for…

Key takeaways

Greg Hammett belongs to physics; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Greg Hammett to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Greg Hammett from memory before moving on to harder problems.

Reference excerpt

Gregory Wayne Hammett is an American plasma physicist, who is a professor at the Department of Astrophysical Sciences at Princeton University and a principal research scientist at the Princeton Plasma Physics Laboratory. Known for his computational and theoretical studies on plasma turbulence, he received the James Clerk Maxwell Prize for Plasma Physics alongside his former doctoral student Bill Dorland in 2024 "for pioneering work in kinetic plasma turbulence that revolutionizes turbulent transport calculations for magnetic confinement devices and inspires research in astrophysical plasma turbulence." Hammett received B.A. degree in physics from Harvard University and Ph.D. in astrophysical sciences from Princeton University in 1980 and 1986, respectively. He was elected as a fellow of the American Physical Society in 1997. He has been a lecturer with the rank of professor in the Princeton Program in Plasma Physics since 2001 and has been an associate faculty member with the Program in Applied & Computational Mathematics. In 2021, he was named as a Distinguished Scientist Fellow by the United States Department of Energy for his research on plasma turbulence in fusion and astrophysics.

Selected publications Journal articles Hammett, Gregory W.; Perkins, Francis W. (1990). "Fluid moment models for Landau damping with application to the ion-temperature-gradient instability". Physical Review Letters. 64 (25): 3019–3022. doi:10.1103/PhysRevLett.64.3019. Beer, M. A.; Cowley, S. C.; Hammett, G. W. (1995). "Field-aligned coordinates for nonlinear simulations of tokamak turbulence". Physics of Plasmas. 2 (7): 2687–2700. doi:10.1063/1.871232. Waltz, R. E.; Staebler, G. M.; Dorland, W.; Hammett, G. W.; Kotschenreuther, M.; Konings, J. A. (1997). "A gyro-Landau-fluid transport model". Physics of Plasmas. 4: 2482–2496. doi:10.1063/1.872228. Dimits, A. M.; Bateman, G.; Beer, M. A.; Cohen, B. I.; Dorland, W.; Hammett, G. W.; Kim, C.; Kinsey, J. E.; Kotschenreuther, M.; Kritz, A. H.; Lao, L. L.; Mandrekas, J.; Nevins, W. M.; Parker, S. E.; Redd, A. J.; Shumaker, D. E.; Sydora, R.; Weiland, J. (2000). "Comparisons and physics basis of tokamak transport models and turbulence simulations". Physics of Plasmas. 7: 969–983. doi:10.1063/1.873896. Schekochihin, A. A.; Cowley, S. C.; Dorland, W.; Hammett, G. W.; Howes, G. G.; Quataert, E.; Tatsuno, T. (May 2009). "Astrophysical gyrokinetics: Kinetic and fluid turbulent cascades in magnetized weakly collisional plasmas". The Astrophysical Journal Supplement Series. 182 (1): 310–377. arXiv:0704.0044. doi:10.1088/0067-0049/182/1/310.

References

External links Official website

Worked examples

Example 1 — a first encounter with Greg Hammett

Start with the simplest possible case. Write down what Greg Hammett claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Greg Hammett before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Greg Hammett ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Greg Hammett

In research: Greg Hammett appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Greg Hammett in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Greg Hammett is common in secondary-school and first-year university syllabi. It links to neighbouring topics 20th-century American physicists, 21st-century American physicists, American astrophysicists, so understanding it makes those chapters shorter.
In everyday life: Look for Greg Hammett outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Greg Hammett in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Greg Hammett means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Greg Hammett out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Greg Hammett in simple terms?

Why does Greg Hammett matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Greg Hammett?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Greg Hammett.