physics

Kicker magnet

Kicker magnet 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 Kicker magnet rather than just read about it. In short: Kicker magnets are dipole magnets used to rapidly switch a particle beam between two paths. Conceptually similar to a railroad switch in function, a kicker magnet must switch on very rapidly, then maintain a stable magnetic field for some minimum time.

Key takeaways

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

Reference excerpt

Kicker magnets are dipole magnets used to rapidly switch a particle beam between two paths. Conceptually similar to a railroad switch in function, a kicker magnet must switch on very rapidly, then maintain a stable magnetic field for some minimum time. Switch-off time is also important, but less critical. An injection kicker magnet merges two beams incoming from different directions. Most commonly, there is a beam circulating in a synchrotron, in the form of a particle train which only partially fills the arc. As soon as the circulating particle train has passed the kicker, it is switched on so that an additional batch of particles may be appended to the train. The magnet must then be switched off in time to not affect the head of the train when it next rounds the synchrotron. An ejection kicker magnet does the opposite, diverting a circulating beam so it leaves the synchrotron. Almost always, an ejection kicker is used to eject the entire particle train, emptying the synchrotron. This means that it has the entire tail-to-head gap in the synchrotron to function, and the switch-off time is essentially irrelevant. However, it must hold a stable field for longer (one full rotation of the synchrotron), and must generate a stronger magnetic field, as it is used to eject a higher energy beam that has been accelerated in the synchrotron. The magnets are powered by a high voltage (usually in the range of tens of thousands of volts) source called a power modulator which uses a pulse forming network to produce a short pulse of current (usually in the range of a few nanoseconds to a microsecond and thousands of amperes in amplitude). The current produces a magnetic field in the magnet, which in turn imparts a Lorentz force on the particles as they traverse the magnet's length, causing the beam to deflect into the proper trajectory. Because a kicker magnet applies a particular lateral impulse to the beam, to achieve a fixed deflection angle the strength of the kick must be accurately matched to the momentum of the particles. This is part of the power modulator's job.

References Barnes, M.J.; Ducimetière, L.; Fowler, T.; Senaj, V.; Sermeus, L. (8 March 2011). "Injection and extraction magnets: kicker magnets". arXiv:1103.1583 [physics.acc-ph]. Barnes, M.J.; Borburgh, J.; Goddard, B.; Hourican, M. (March 2011). "Injection and extraction magnets: septa". arXiv:1103.1062 [physics.acc-ph].

Illustrations

Worked examples

Example 1 — a first encounter with Kicker magnet

Start with the simplest possible case. Write down what Kicker magnet 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 Kicker magnet 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 Kicker magnet 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 Kicker magnet

In research: Kicker magnet 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 Kicker magnet 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: Kicker magnet is common in secondary-school and first-year university syllabi. It links to neighbouring topics Accelerator physics, Accelerator physics stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Kicker magnet 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 Kicker magnet in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Kicker magnet 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 Kicker magnet out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Kicker magnet in simple terms?

Why does Kicker magnet 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 Kicker magnet?

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 Kicker magnet.