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Booster Dampers Update. Nathan Eddy PIP Meeting 4/30/14. Transverse Damper. RF Lock – No loss of lock since “fix” New Firmware with Timofey Zolkin’s n-turn filter coefficients installed Testing and verification underway Basic Timing, Filter Algorithm, Tune Monitor. Longitudinal Damper.

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Presentation Transcript
booster dampers update

Booster Dampers Update

Nathan Eddy

PIP Meeting

4/30/14

transverse damper
Transverse Damper
  • RF Lock – No loss of lock since “fix”
  • New Firmware with TimofeyZolkin’s n-turn filter coefficients installed
  • Testing and verification underway
    • Basic Timing, Filter Algorithm, Tune Monitor
ld block diagram
LD Block Diagram

NCO

cos

NCO

cos

CIC

Dec

BP FIR

-45°

CIC

Interp

4*RF

~211MS/s

4*RF

~211MS/s

x

x

+

ADC

DAC

Σ

~25KHz

+ -

CIC

Dec

BP FIR

+45°

CIC

Interp

x

x

NCO

sin

NCO

sin

Same NCO generates sin, cos for I,Q mixing

NCO frequency is centered on rev harmonic of interest

Set CIC decimation so that notches on RevF

BP FIR is a N tap filter for signal conditioning

Mɸ correspond to programmable magnitude/phase shift

For output sum, +/- select upper/lower sideband (SSB)

Will also suppress carrier

Note, this same firmware design can be used for “direct sideband” detection by adjusting the NCO frequency and modifying the FIR filter coefficients

test installation
Test Installation

Notch

Filter

RF Ref

TCLK

BP

Filter

Mode N

Pickup

Digital

Damper

RF Ref

WCM

Phase Pickup

Mode 1

raw data
RAW Data

15ms

MODE 50

raw data zoom
RAW Data Zoom

After 90MHz LP Filter

summary
Summary

NCO

cos

NCO

cos

CIC

Dec

BP FIR

-45°

CIC

Interp

4*RF

~211MS/s

4*RF

~211MS/s

x

x

+

ADC

DAC

Σ

~25KHz

+ -

CIC

Dec

BP FIR

+45°

CIC

Interp

x

x

NCO

sin

NCO

sin

ADC through CICdec implemented and tested in Booster

CICint and DAC tested on bench

Design as shown under checkout right now

Expect to begin testing in Booster this week

To Do List

Develop complete Matlab Simulation

Allow ability to optimize filtering

Implement Beam Transfer Function Measurement

for open and closed loop measurements

Straightforward method to optimize gain/phase

Demonstrate damping on single Booster Mode