(on behalf of the beam diagnostics group)
Transcript of (on behalf of the beam diagnostics group)
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Outline
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• Introduction
• Stability Requirements
• General System Requirements
• FOFB Strategy
• Hardware Overview
• Performance Tests: Laboratory Bench
• Performance Tests: SPEAR3 Beam (SLAC/SSRL)
• Final Remarks
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Introduction
LNLS UVX storage ring
1.37 GeV 2nd generation light source
Operating since 1997
Campinas, State of São Paulo, Brazil
Sirius
3 GeV light Source
First beam: mid-2018
Brazilian Center for Research in Energy and Materials 3 of 25
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Introduction
Picture – December 2013March 2014: Earthwork finalized
October 2014: Construction companies selection
LNLS-UVX
Storage Ring
Sirius
3 GeV, 0.28 nm, 5BA
518 meter circumference
Sirius commissioning has been rescheduled and should occur in
the 1st semester of 2018.4 of 25
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Outline
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• Introduction
• Stability Requirements
• General System Requirements
• FOFB Strategy
• Hardware Overview
• Performance Tests: Laboratory Bench
• Performance Tests: SPEAR3 Beam (SLAC/SSRL)
• Final Remarks
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Requirements of Sirius RF BPM electronics.
Parameter Value
Resolution (RMS) @ 0.1 Hz to 1 kHz < 80 nm
Resolution (RMS) @ turn-by-turn full bandwidth
< 3 µm
1 hour position stability (RMS) < 0.14 µm
1 week stability (RMS) < 5 µm
Beam current dependence (decay mode) < 1 µm
Beam current dependence (top-up mode) < 0.14 µm
Filling pattern dependence < 5 µm
Stability Requirements
Energy: 3GeV
Natural emittance: 0.28 nm.rad
RF frequency: ~500 MHz
Natural bunch length: ~ 8.8 ps
Requirements for Sirius RF BPM electronics
**
*
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Outline
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• Introduction
• Stability Requirements
• General System Requirements
• FOFB Strategy
• Hardware Overview
• Performance Tests: Laboratory Bench
• Performance Tests: SPEAR3 Beam (SLAC/SSRL)
• Final Remarks
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• Electron and photon beam position monitoring from accelerator’s control system
• Storage ring Fast Orbit Feedback control: stabilizes beam orbit at sub-micron level
• Orbit interlock: prevents machine from damage due to mis-steered high power photon beams
• Machine studies: turn-by-turn readouts provide valuable information of machine behavior
• Failure diagnostics: beam loss analysis (post-mortem)
• General diagnostics
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General System Requirements
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Outline
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• Introduction
• Stability Requirements
• General System Requirements
• FOFB Strategy
• Hardware Overview
• Performance Tests: Laboratory Bench
• Performance Tests: SPEAR3 Beam (SLAC/SSRL)
• Final Remarks
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FOFB Strategy
< 80 nm10 ~ 30 mslatency
~ 110 kHzUpdate rate
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FOFB Strategy
0 10 20 30 40 50 60 70 800
200
400
600
800
1000
1200
1400
1600
1800
2000
Vacuum chamber bandwidth = 14.80 kHzBPM group delay = 3 FOFB sampling period
Total data distribution delay from/to FOFB controller (ms)
Cro
ssov
er fr
eque
ncy
(Hz)
1 kHz
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Outline
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• Introduction
• Stability Requirements
• General System Requirements
• FOFB Strategy
• Hardware Overview
• Performance Tests: Laboratory Bench
• Performance Tests: SPEAR3 Beam (SLAC/SSRL)
• Final Remarks
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Hardware Overview
RFFE v2: (diagonal channels)
RFFE v1 (block diagram and tests)
R. Biscardi, J. W. Bittner, “Switched Detector for Beam Position Monitor”, PAC’1989
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B. Keil et al., “Development of New
BPM Electronics for the Swiss Light
Source, IBIC’ 2012
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Hardware Overview
FMC standard 130 MSP/s 16-bit ADC board “Standard” features
• External clock input
• Adjustable oscillator’s frequency for internal clock
• FMC standard (FPGA Mezzanine Card)
PLL tuning for internal clock
Optimized for undersampling
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Hardware Overview
Designed by Warsaw University of Technology (WUT) for LNLS
Commercial crate
More info online at:
6th meeting of the xTCA interest group“A MicroTCA system for Sirius BPM”Daniel Tavares (LNLS)
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Outline
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• Introduction
• Stability Requirements
• General System Requirements
• FOFB Strategy
• Hardware Overview
• Performance Tests: Laboratory Bench
• Performance Tests: SPEAR3 Beam (SLAC/SSRL)
• Final Remarks
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Performance Tests: Bench
v2
Block diagram of the setup used for the BPM electronics test
R&S SMA100A RF generator
@ 476 MHz
R&S SMA100ARF generator@ 113 MHz
Ext. ClockSource
ADC clock / RF signals freq.:
UVX: 476 / 113 MHzSirius: 500/ 117 MHz
BPM geometric factor:𝑲 = 𝟏𝟎 mm 17 of 25
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Performance Tests: Bench
Beam Current Dependence – long range
Recent tests with longer buffers
The temperature dependence was kept below 140 nm under a 8 C degrees temperature variation.
~2 days test
RMS X, Y < 140 nm
Data rate: ~10 Hz
Bandwidth: ~2 Hz
Beam Current Dependence – short range
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IBIC’2013 (MOPC09)
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Switching on
Switching off
Performance Tests: BenchDiagonal switching scheme virtually eliminates electronic noise originated in
the RF chain downstream of the switches up to a certain frequency…
-10 dBm ~ 500 mA-20 dBm ~ 160 mA
Switching frequency~ 110 kHz (complete cycle)
Test setup
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Compare Red vs Brown and/or
Blue vs Black
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Switching @ ~ 110 kHz
Performance Tests: BenchThe switching scheme introduces coherence between the diagonal channel
pairs (A-C and B-D) from DC to approximately 40 kHz.
𝐶𝑥𝑦 (𝑓) = 𝑃𝑥𝑦 (𝑓)
2
𝑃𝑥𝑥 (𝑓)𝑃𝑦𝑦 (𝑓)
Test setup
Low frequency range:High coherence (DC-100 Hz)
Medium frequency range:Decreasing coherence(100 Hz - 40 kHz)
High frequency range:No coherence(40 kHz - few GHz)
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Performance Tests: Bench
Wrong FPGA calibration of delays between ADC clock and data paths caused the problem!
Test setup
Test setupNew result
Old result
IBIC’2013 (MOPC09)
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Outline
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• Introduction
• Stability Requirements
• General System Requirements
• FOFB Strategy
• Hardware Overview
• Performance Tests: Laboratory Bench
• Performance Tests: SPEAR3 Beam (SLAC/SSRL)
• Final Remarks
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Performance Tests: Beam
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Block diagram of the setup used for the BPM electronics test
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Testes performed atSPEAR3 (SLAC/SSRL)
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Performance Tests: Beam
Comparing real beam, real beam @ low alpha mode and RF generators
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Low alpha bunch length ~ 4.5 ps
Users beam bunch length ~ 18 ps
Equivalent to ~40 mA
Equivalent to ~500 mA
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Final Remarks
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• Open Hardware repository: www.ohwr.org/projects
• Substantial integration work on the digital back-end will take place in 2015
• The performance of the Sirius BPM electronics “analog” hardware was improved
• Critical specifications are now met with exceeding performance
• BPM electronics design was performed in order to not limit the FOFB performance
• Efforts will be redirected to pre series production of RFFE and ADC boards in the 1st semester of 2015