View
221
Download
0
Category
Preview:
Citation preview
XFELThe EuropeanX-Ray Laser Project X-Ray Free-Electron Laser
Review of LLRF system based on ATCA standard, Dec 3-4, 2007
Piezodriver and piezo controlWork Package 1.4
P. Sekalski, M. Grecki, T. Pozniak, K. Przygoda
Department of Microelectronics and Computer Science, Technical University of Lodz, Poland
Przemek Sekalski, Department of Microelectronics and Computer Science, Technical University of Lodz, PolandReview of LLRF system based on ATCA standard, Dec 3-4, 2007 2
XFELThe EuropeanX-Ray Laser Project X-Ray Free-Electron Laser
The agenda
The main aim of the piezocontrol system
General requirements and assumptions of piezocontrol system
Overview of the piezocontrol system in regard of LLRF system
Piezocontroller architecture
Piezodriver scheme
Piezo read-out architecture
Przemek Sekalski, Department of Microelectronics and Computer Science, Technical University of Lodz, PolandReview of LLRF system based on ATCA standard, Dec 3-4, 2007 3
XFELThe EuropeanX-Ray Laser Project X-Ray Free-Electron Laser
The main aim of piezocontrol system
Drive the piezoelements assembled in fast tuners frames to minimize the Lorentz force and microphonics effects
On-line frequency detuning calculation
Microphonics measurement (i.e. diagnostics of cryogenic system)
Przemek Sekalski, Department of Microelectronics and Computer Science, Technical University of Lodz, PolandReview of LLRF system based on ATCA standard, Dec 3-4, 2007 4
XFELThe EuropeanX-Ray Laser Project X-Ray Free-Electron Laser
General requirements and assumptions of piezocontrol system
Lorentz force detuning during flat-top Δflat top< 10 Hz for field up to 30 MV/m(compensation up to 600 Hz)
Maximal repetition rate of RF pulse under 10 Hz (20 Hz optional)
Standalone box for piezodriver, DAC and ADC boards(no-ATCA due to power consumption) 2 x EuroCrate 6U
PiezoController compatible with ATCA carrier board
Optical link between PiezoController and DACs and ADCs cards
System suitable for 64 PI’s and/or NOLIAC’s piezoelements (4 modules x 8 cavities x 2 piezoelements each)
26 Piezocontrol systems (101 modules, 808 cavities, 1616 Piezos)
Przemek Sekalski, Department of Microelectronics and Computer Science, Technical University of Lodz, PolandReview of LLRF system based on ATCA standard, Dec 3-4, 2007 5
XFELThe EuropeanX-Ray Laser Project X-Ray Free-Electron Laser
Controller
Low Level Application
High Level Application
Control System
8 8 8 8 8 8 8 8 8 8 8 8
Overview of the piezocontrol system
ForwardReflected Probe
Przemek Sekalski, Department of Microelectronics and Computer Science, Technical University of Lodz, PolandReview of LLRF system based on ATCA standard, Dec 3-4, 2007 6
XFELThe EuropeanX-Ray Laser Project X-Ray Free-Electron Laser
Overview of the piezocontrol system
Controller
Low LevelApplication
High LevelApplication
Control System
8 8 8 8 8 8 8 8 8 8 8 8
Piezo ControllerATCA compatible
8 ch PZD amplifier8 ch PZD amplifier8 ch PZD amplifier
8 in 1 PZD
amplifier
ADC32 in 1
8 88 88 888
Low Level Application
Control System
x4
DAC 32 in 1
DAC
Przemek Sekalski, Department of Microelectronics and Computer Science, Technical University of Lodz, PolandReview of LLRF system based on ATCA standard, Dec 3-4, 2007 7
XFELThe EuropeanX-Ray Laser Project X-Ray Free-Electron Laser
Requirements for PiezoController
Hardware requirements:
Lorentz Force:
FSM, adder, multiplier, bram-blocks
Microphonics:
NLMS filter of order 32/64 (up to 64 multipliers) Adders 5x32
FPGA Spartan 3 xc3s2000
ATCA Carrier Board compatible (PCI Express)
OptoLink to Controller (TLK 2501) OptoLink to DACs and ADCs cards (TLK 2501)
Przemek Sekalski, Department of Microelectronics and Computer Science, Technical University of Lodz, PolandReview of LLRF system based on ATCA standard, Dec 3-4, 2007 8
XFELThe EuropeanX-Ray Laser Project X-Ray Free-Electron Laser
Piezocontroller architecture – 2 FPGA for 8 cavities
PZD
Δt, f, Aref_table
PZSΔ 32 in 1
Control System
DAC
LLA
FPGATimingtrig
DAC PZD
PZS
Control System
Piezo diagnosticInterlocks
…
4x 8 in 132 in 1
ATCA
ADC
ADC
Przemek Sekalski, Department of Microelectronics and Computer Science, Technical University of Lodz, PolandReview of LLRF system based on ATCA standard, Dec 3-4, 2007 9
XFELThe EuropeanX-Ray Laser Project X-Ray Free-Electron Laser
Piezocontroller - FPGA
Sine generator
Δt, f, Aref_table
reference errors signal (microphonics) f(UPiezo_sens)PID controllerΔ reference error signal
(LFD) f(Δ)
Upiezo sens
LF/piezoΔA
trig
x8
Piezo diagnosticInterlocks
K1
K2
K3
Upiezo act
Przemek Sekalski, Department of Microelectronics and Computer Science, Technical University of Lodz, PolandReview of LLRF system based on ATCA standard, Dec 3-4, 2007 10
XFELThe EuropeanX-Ray Laser Project X-Ray Free-Electron Laser
PiezoController architecture
The feedback loop’s latencies < 0.5 ms
The piezo-to-piezo feedback loop based on PID controller (vibration cancellation between the pulses)
The detuning-to-piezo loop based on adaptive feed-forward (short RF pulse in comparison to mechanical action of cavity)
OptoLink to DAC board and ADC board
Piezo diagnostic (i.e. capacitance measurement)
Interlocks (protection when module is warm)
Przemek Sekalski, Department of Microelectronics and Computer Science, Technical University of Lodz, PolandReview of LLRF system based on ATCA standard, Dec 3-4, 2007 11
XFELThe EuropeanX-Ray Laser Project X-Ray Free-Electron Laser
Low Level Application
FPGA implementation of detuning algorithm for 8 cavities
probefor
probe
forprobe
U
U
dt
d
sin22
12/1
Ufor is a magnitude of forward signal,for is a phase of forward signal,Uprobe is a magnitude of probe signal,probe is a phase of probe signal,1/2 cavity half-bandwidth
Forward signal and reflected signal must be decoupled (signal callibration)
Przemek Sekalski, Department of Microelectronics and Computer Science, Technical University of Lodz, PolandReview of LLRF system based on ATCA standard, Dec 3-4, 2007 12
XFELThe EuropeanX-Ray Laser Project X-Ray Free-Electron Laser
Piezo Read-out
Main objective: – read and adjust the impedance of piezoelements, which
work as sensors in fast tuners
General overview:– Standalone box (no ATCA, EuroCrate), – close to PZD for exchanging piezostack functionality– 32 analog input channels (for 4 cryomodules),– 32 channel ADC (sampling higher than 10 kHz/channel)– Opitcal Link to PiezoController for data exchange and
board monitoring
Przemek Sekalski, Department of Microelectronics and Computer Science, Technical University of Lodz, PolandReview of LLRF system based on ATCA standard, Dec 3-4, 2007 13
XFELThe EuropeanX-Ray Laser Project X-Ray Free-Electron Laser
DAC board
Optolink to PiezoController (Spartan support for TLK 2501) for data exchange and board monitoring
DAC 32 channels (14 bits)
Output voltage ± 1 V
Mounted in EuroCrate 6U close to PZD
Przemek Sekalski, Department of Microelectronics and Computer Science, Technical University of Lodz, PolandReview of LLRF system based on ATCA standard, Dec 3-4, 2007 14
XFELThe EuropeanX-Ray Laser Project X-Ray Free-Electron Laser
Piezodriver main parameters
Suitable for both types of piezostacks up to 5µF:
Physik Instrumente (P-888.90 PIC255); C2K4,4 µF
NOLIAC (SCMAS/S1/A/10/10/20 /200/42/6000); C2K 2,4 µFMaximal supply voltage up to ± 150 V (nominal ±80V)Input voltage ± 1 V
Amplifier gain Gu= 100V/V,
Operational temperature Tc < 75°C (Tj <125 °C)Pass-band frequency up to 5 kHz (for load 5uF)Need dedicated Power Supply
Single channel PiezoDriver with Power Booster PB518 channels PZD on single boardUp to 4 periods of sinus wave input signal 200 Hz, 10 Hz repetition rate,
Przemek Sekalski, Department of Microelectronics and Computer Science, Technical University of Lodz, PolandReview of LLRF system based on ATCA standard, Dec 3-4, 2007 15
XFELThe EuropeanX-Ray Laser Project X-Ray Free-Electron Laser
Piezodriver scheme
Inputs
Outputs
Voltagesense output
Current sense output
8x Piezo Drivers
Przemek Sekalski, Department of Microelectronics and Computer Science, Technical University of Lodz, PolandReview of LLRF system based on ATCA standard, Dec 3-4, 2007 16
XFELThe EuropeanX-Ray Laser Project X-Ray Free-Electron Laser
Piezodriver scheme
Input
PreamplifierOP177
Power BoosterPB51
+15V
-15V
+Vss
-Vss
Output
Przemek Sekalski, Department of Microelectronics and Computer Science, Technical University of Lodz, PolandReview of LLRF system based on ATCA standard, Dec 3-4, 2007 17
XFELThe EuropeanX-Ray Laser Project X-Ray Free-Electron Laser
Thank you for your attention
Recommended