Download - EuCard WP10.6 – LLRF at FLASH
EuCARD-SRF Annual Review, IPN Orsay, 4-5.05.201
EuCardWP10.6 – LLRF at FLASH
Development of Fast ADC Card for the LLRF System
Samer Bou Habib
EuCARD-SRF Annual Review, IPN Orsay, 4-5.05.201
Agenda
● Main goal and applications● Function in LLRF● Hardware● System concept● Measurement Result● Future plans
EuCARD-SRF Annual Review, IPN Orsay, 4-5.05.201
Main goal and Applications
● Fast ADC testing for LLRF● Applications
– Direct Sampling (IQ detection)– Digital phase detection– Amplitude detection
EuCARD-SRF Annual Review, IPN Orsay, 4-5.05.201
LLRF at FLASH
EuCARD-SRF Annual Review, IPN Orsay, 4-5.05.201
LLRF system with DWCs
Timing
to LO
8 x cavityMaster Oscillator
A & F
PS
klystron RF power transmition
Down-converters
ADC
LO
ADC
LO
ADC
LO
ADC
LO8 x
ADC
LO
ADC
LO
ADC
LO
ADC
LO8 x
ADC
LO
ADC
LO
ADC
LO
ADC
LO8 x
8x forward and reflected power
8x transmitted
Digital/analog feedback controller
DSP/FPGA
DAC
DAC
Vector modulator
EuCARD-SRF Annual Review, IPN Orsay, 4-5.05.201
LLRF system with Fast ADCs
Timing
DSP/FPGA
PS
DAC
DAC
Master Oscillatorklystron RF power transmition
8 x cavity
Digital/analog feedback controller
A & F
Vector modulator
8x forward and reflected power
ADC
ADC
8 x
ADC
ADC
8 x
ADC
ADC
8 x
8x transmitted
EuCARD-SRF Annual Review, IPN Orsay, 4-5.05.201
Benefits
● Replacing DWCs and data-analyzing boards with single design Lower cost Removing problems with DWCs (non-
linearities and drifts)
● Eliminating complex LO generation
EuCARD-SRF Annual Review, IPN Orsay, 4-5.05.201
Hardware
● Actual– 2 x ATCA board
● 12-bit 500 MSPS 2.3 GHz BW● 14-bit 400 MSPS 1.4 GHz BW
● Future– uTCA Version– Amplitude detector for ADCM– Optical signals phase measurement
EuCARD-SRF Annual Review, IPN Orsay, 4-5.05.201
System Concept for Actual Hardware
FPGA (IQ detection,
Pre-processing)
Trigger
Diagnostics
ADCADCADC
8 x
ADCADCADCADCADC
DopasowanieDopasowanieDopasowanieDopasowanieDopasowanieDopasowanieDopasowanieMatching
Pamiec SRAM
Pamiec SRAM
Pamiec SRAMSRAM
1.3 GHz Signal
Reference clock Clock synthesis and distribution
USER
ATCA
External Interfaces
Processor daughter board
EuCARD-SRF Annual Review, IPN Orsay, 4-5.05.201
PCB
EuCARD-SRF Annual Review, IPN Orsay, 4-5.05.201
Measurement Result
● Amplitude stability ~2e-4
0 1 2 3 4 5 6 7
x 104
0.0834
0.0834
0.0834
0.0834
0.0834
0.0835
0.0835
0 1 2 3 4 5 6 7
x 104
-80
-60
-40
-20
0
20
40
RF input
CLK reference
To PC
● IQ detection
EuCARD-SRF Annual Review, IPN Orsay, 4-5.05.201
Future Plans
● Finish tests for the ATCA boards● Test performance and effect on
FLASH● Prepare boards for the new
standards (uTCA) / future applications
