LLRF for SC Heavy Ion Linear Accelerators Paper study at USPAS17 - - PowerPoint PPT Presentation

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Sep 02, 2022 185 likes •341 views

LLRF for SC Heavy Ion Linear Accelerators Paper study at USPAS17 Qi Chen IMPCAS and LBNL Low Level RF block-diagram Phase / Amplitude Detecting I & Q D e m o d u l a t o r RF LO Some trigonometric equations Low Level RF

SLIDE 1

LLRF for SC Heavy Ion Linear Accelerators

Paper study at USPAS17 Qi Chen IMPCAS and LBNL

SLIDE 2

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Low Level RF block-diagram

SLIDE 4

Phase / Amplitude Detecting

I & Q Demodulator

LO RF

SLIDE 5

Some trigonometric equations

SLIDE 6

Low Level RF block-diagram

SLIDE 7

Phase / Amplitude Modulation

I & Q Modulator

LO RF

SLIDE 8

Some trigonometric equations

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How mixer works

We need new frequency

Ideal Mixer (Multiplier) Local Oscillator Input Signal Output Signal

SLIDE 10

How to get 90° phase shift

When a sinusoidal voltage is applied to either a

simple capacitor or inductor, the resultant current that flows is "in quadrature" with the voltage.

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Low Level RF block-diagram

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I Value Q Value A m p l i t u d e Phase

Phase Diagram

SLIDE 13

I & Q Modulation

I & Q Modulator

Output

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