Cryptic/Quick Crossword No. 205

[birdie05]

Need help with the following clues please. 4A: Treat food by cooling in vacuum F????? D?Y (6-3)
14A: Electron accelerator ?????R?N (8)
19A: Lots and lots ???L?S (6)
10A: Nerve centres ????L?A (7)
15d: Written works lacking authority ????R?P?A (9)
Thanks in advance

[Fibonacci]

1 freeze dry

[sandyRoe]

freeze dry
10a Ganglia?
15d Apocrypha?

[sandyRoe]

19a Oodles?

[Canary42]

4a freeze dry
19 oodles

[cupid04]

4a] freeze dry

[cupid04]

19a] oodles

[Fibonacci]

14a betatron?

[cupid04]

14a] positron

[birdie05]

Thank you all for your help.

[Fibonacci]

positron - The positron or antielectron is the antiparticle or the antimatter counterpart of the electron.
betatron - A betatron is a cyclotron developed in 1940 to accelerate electrons.

[birdie05]

Thank you Fibonacci for your info.Betatron fits in with the other clues.