physics

SACLA

SACLA 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 SACLA rather than just read about it. In short: The SPring-8 Angstrom Compact Free Electron Laser, referred to as SACLA (pronounced さくら (Sa-Ku-Ra)), is an X-ray free-electron laser (XFEL) in Harima Science Garden City, Japan, embedded in the SPring-8 accelerator and synchrotron complex. When it first came into operation 2011, it was the second XFEL in the world and the first in Japan.

Key takeaways

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

Reference excerpt

The SPring-8 Angstrom Compact Free Electron Laser, referred to as SACLA (pronounced さくら (Sa-Ku-Ra)), is an X-ray free-electron laser (XFEL) in Harima Science Garden City, Japan, embedded in the SPring-8 accelerator and synchrotron complex. When it first came into operation 2011, it was the second XFEL in the world and the first in Japan.

Design

Like other XFELs, SACLA uses self-amplified spontaneous emission to achieve extremely high intensities of X-rays. SACLA uses in-vacuum, short-period undulators, which is one of the unique factors in its design that allows it to achieve sub-Ångstrom wavelengths of 0.6 Å at a relatively much shorter distance of 0.7 km, compared to other similar XFELs like LCLS (2 km) or the European XFEL (3.4 km). An 8.5 GeV electron beam is used as the source.

Animated short films SACLA has released a number of animated short films to promote its research capabilities to the public. In July 2013, SACLA released two animated short films titled "Picotopia", which discussed the cellular biology, and "Wasureboshi", which is about conception. On December 3, 2013, another animated short titled "Mirai Koshi: Harima SACLA" was released to promote the XFEL's ability to detect atoms and molecules.

References

Further reading SACLA home page First Light at SACLA

Worked examples

Example 1 — a first encounter with SACLA

Start with the simplest possible case. Write down what SACLA 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 SACLA 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 SACLA 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 SACLA

In research: SACLA 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 SACLA 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: SACLA is common in secondary-school and first-year university syllabi. It links to neighbouring topics Accelerator physics stubs, Free-electron lasers, Harima Science Garden City, so understanding it makes those chapters shorter.
In everyday life: Look for SACLA 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study SACLA in 20 minutes

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

Frequently asked questions

What is SACLA in simple terms?

Why does SACLA 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 SACLA?

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 SACLA.