head person

A computer program; otherwise programme

use ndash

Proton Synchrotron Booster

Polarizzazione del Vuoto con LASer (Polarisation of Vacuum with LASer), Italy

Acronym doesn’t need spelling out for the CERN Courier

Quantum chromodynamics

Acronym doesn't need spelling out for the CERN Courier

Quark–gluon plasma

Lower case, note the en dash

Any of a number of subatomic particles carrying a fractional electric charge, postulated as building blocks of the hadrons. Quarks have not been directly observed but theoretical predictions based on their existence have been confirmed experimentally.

Quarks have the different states up, down, top, bottom, charm and strange.  Use a space after the state:

Of all the quarks I have studied, I find the up quark the most intriguing.

Unless they are used as compound adjectives:

A quench is an abnormal termination of magnet operation that happens when part of the superconducting coil goes back to its normal (resistive) state. This can happen if the field inside the magnet or the rate of change of field is too large (causing eddy currents and heating in the copper support matrix), or due to a combination of the two. More rarely, a defect in the magnet can cause a quench. 

Readers are entitled to believe that anything appearing within direct quotes are the actual words used by the speaker.

• Remove ums and aahs and correct for grammar 
• If you are unsure of the exact wording use reported speech 
• Open quotes with a colon, and close them after the punctuation mark
• Use says, not said (though said is permissible for famous historical examples)

"I really enjoyed the part about the accelerators," says Joe Bloggs. "It got me interested in physics again."

Radiation to Electronics

no hyphen

Spell out on first mention, then abbreviate to RF cavity

Rutherford Appleton Laboratory

no italics

Research Board