downconverter cavity field detection for the atca system
DESCRIPTION
Downconverter Cavity Field Detection for the ATCA System. F.Ludwig , M.Hoffmann, DESY K.Suchecki, WUT-ISE H. PielCryoelectra GmbH. Outline. Cavity Field Detection Requirements Downconverter for LLRF Achieved Performance from FLASH studies - PowerPoint PPT PresentationTRANSCRIPT
XFELThe EuropeanX-Ray Laser Project
X-Ray Free-Electron Laser
1
Frank Ludwig, DESY
XFEL-LLRF-ATCA Meeting, 3-4 December 2007
DownconverterCavity Field Detection for the ATCA System
F.Ludwig, M.Hoffmann, DESYK.Suchecki, WUT-ISEH. Piel Cryoelectra GmbH
2
Frank Ludwig, DESY
XFEL-LLRF-ATCA Meeting, 3-4 December 2007
XFELThe EuropeanX-Ray Laser Project
X-Ray Free-Electron Laser
Outline
• Cavity Field Detection Requirements
• Downconverter for LLRF
• Achieved Performance from FLASH studies
• Main and Booster Section Downconverter
• Injector and 3rd Harmonic Section Downconverter
• Most important problems
• Automated Drift Calibration
• Project status and plans
3
Frank Ludwig, DESY
XFEL-LLRF-ATCA Meeting, 3-4 December 2007
XFELThe EuropeanX-Ray Laser Project
X-Ray Free-Electron Laser
Cavity Field Detection Requirements
deg 0.1 %, 1.0A/A
rms
rms
deg 0.03 %, 03.0A/A
rms
rms
deg 0.01 %, 01.0A/A
rms
rms
GHz3.1fCAV
Amplitude andPhase stability :
Requirements for different LLRF-stations:
(ACC4,ACC5,ACC6)
4
Frank Ludwig, DESY
XFEL-LLRF-ATCA Meeting, 3-4 December 2007
XFELThe EuropeanX-Ray Laser Project
X-Ray Free-Electron Laser
Downconverter for LLRF
Relevant sections for the detection of the cavity field :
- Reference- Mixer- ADCs- Timing
5
Frank Ludwig, DESY
XFEL-LLRF-ATCA Meeting, 3-4 December 2007
XFELThe EuropeanX-Ray Laser Project
X-Ray Free-Electron Laser
Downconverter for LLRF
Intermediate frequency [10MHz, 50MHz]:
Master-Oscillator
ADC
LO-input
ADC clock
BPFRF-input
f
sf
Digital
I,Q-Detection
IFf
CIC
Filter
Receiver CH1
LNA
Sampling and Field Detection
LO and CLK Generation
Input
Calibration
,A
Muti-channel downconverter
Sample frequency [50MHz-130MHz]
Single cavity field in amplitude and phase
6
Frank Ludwig, DESY
XFEL-LLRF-ATCA Meeting, 3-4 December 2007
XFELThe EuropeanX-Ray Laser Project
X-Ray Free-Electron Laser
Achieved Performance from FLASH studies
Multi-channel downconverter :
8 channel Gilber-mixer receiver VME based+ SIMCON DSP (14-bit ADCs) VME based
Stability results (single channel) :- Shortterm, bunch-to-bunch (800us) :
egd 0.0092 %, 015.0A/A rmsrms
- Midterm, pulse-to-pulse (10min) : egd 0.0147 %, 016.0A/A rmsrms
- Longterm, drifts (1hour) : deg 0.05 %, 09.0A/A pkpkpkpk
Pulse-to-Pulse Beam Stability :
θA = 2e-3/°C, θ
P = 0.2°/°C
(Need for drift calibration)
0.022%
0.016%
Desired XFEL value
Main and Booster section requirements are fulfilled -Injector and 3rd harmonic requirements only nearly.
Can the ATCA system fulfill this too?
7
Frank Ludwig, DESY
XFEL-LLRF-ATCA Meeting, 3-4 December 2007
XFELThe EuropeanX-Ray Laser Project
X-Ray Free-Electron Laser
Main and Booster Section Downconverter
Rear Transition Module (RTM)
Receiver : LT5527 (Gilbert-Mixer)RF: 1300MHz , <10dBmLO: [1310MHz, 1350MHz], 0dBmIF : [10MHz, 50MHz], diff. Outputs
Cavity Signals (24 channels)forward, reflected, probe
Reference (3 channels)Klystron Linearization (3 channels)
Local Oscillator
Control :- Signal Diagnostic (Level, cable,PWR)- Frontend Attenuator- Slow Timing Drift Calibration
X 4
Receiver REF
Receiver CH1
Receiver CH2
Receiver CH3
Receiver CH4
Receiver CH5
Receiver CH6
Receiver CH7
Receiver CH8
LO Distribution
IPMI
PWR
8
Boa
rdD
iagn
ostic
Frontend ADCsLO Generation& Distribution
RF-Reference RF-Calibration Signal
- mixer method- VCOs- Laser to RF
Number of : 4x8, 4x12 or 4x16 dependingReceivers on receiver cell size and PCB routing
8
Frank Ludwig, DESY
XFEL-LLRF-ATCA Meeting, 3-4 December 2007
XFELThe EuropeanX-Ray Laser Project
X-Ray Free-Electron Laser
Injector and 3rd Harmonic Section Downconverter
Cavity Signalsforward, reflected, probe
24
Universal IO
Upconverter
ADCs
fs LaserReference
LO Generation& Distribution
Receiver
Laser toRF-Reference
ATCA Crate
Piezo Driver
LO
LO
RF Reference
IF Signalsforward, reflected, probe
24x4
Drift Calibration+ Reference
Calibration Line
1 Timing
24 2424
Rack Layout :
‚Pizza boxed‘ ATCA System or SIMCON-DSP, ESECON, ACB
9
Frank Ludwig, DESY
XFEL-LLRF-ATCA Meeting, 3-4 December 2007
XFELThe EuropeanX-Ray Laser Project
X-Ray Free-Electron Laser
Injector and 3rd Harmonic Section Downconverter
High Level Downconverter 1.3GHz Injector Receiver : Passive high level mixerRF: 1300MHz , 20dBmLO: 1313MHz, 20dBmIF : 13MHz (propose), single ended
Features :
- Needs more than +20dBm LO Power
- Required space more than VME sized (Stripline design, directional coupler...)
- Amplitude/Phase noise <0.01%, <0.01 deg
- Easy servicing and investigation of LO and IF
- Individual Power Supplies
3.9GHz Injector Receiver :Passive high level mixerRF: 3900MHz , 20dBmLO: 3939MHz, 20dBmIF : 39MHz (propose), single ended
Receiver
or for prototyping...
10
Frank Ludwig, DESY
XFEL-LLRF-ATCA Meeting, 3-4 December 2007
XFELThe EuropeanX-Ray Laser Project
X-Ray Free-Electron Laser
Automated Drift CalibrationA drift compensation is needed to compensate drifts from- Cavity pickup cables (4 module)- Downconverter (mixer)- LO generation (dividers, amplifiers, filters)- ADC CLK generation (timing system, less critical)
1) Injection of the reference signal : 2) Reflection at the cavity :
K1T 25m),( K 125fs ,Km fs5 -1-1-1 θ
A = 2e-3/°C, θ
P = 0.2°/°C
+ Diagnostic+ Compensates connectors
Cavity „Flattop“
t
Beam pause
(Injector)
ADC
Calibration LineRF Reference
LO
ADC
LO
Receiver
to have a robust machine operation.
ADC
LO
ADC
LO
Receiver
ReceiverChannel
In discussion
11
Frank Ludwig, DESY
XFEL-LLRF-ATCA Meeting, 3-4 December 2007
XFELThe EuropeanX-Ray Laser Project
X-Ray Free-Electron Laser
Problems to be solved
- Interference from high-speed digital circuits
- RTM | ATCA | AMC diff. / single ended interfacing ?
ADC
CM
CM
ADC
Distribution within crates :
ADC ADCLPF
,
Lowpass filteringof distortions
12
Frank Ludwig, DESY
XFEL-LLRF-ATCA Meeting, 3-4 December 2007
XFELThe EuropeanX-Ray Laser Project
X-Ray Free-Electron Laser
Project status and plansRTM module1st Version : 4x8, 4x12or 4x16 raw channels, Design, Prototype, Performance Tests (05/08)2nd Version : incl. IPMI + board diagnostic (09/08) Drift calibration frontend (couplers based on transformers)Manpower : H.Piel, Cyroelectra GmbH
Automated Drift calibration1st Version : “Proof of principle“ using discrete Hardware incl. Software (02/08)2st Version : Design calibration and reference crate (10/08)3st Version : Performance comparison for the Injector in Lab & Injector (10/08)Manpower : F.Ludwig/2, G.Möller, W.Koprek, W.Jalmzna (DESY), Fermilab ?
LO-Generation and Distribution1st Version : 1309, 1354 LO-Generation Prototype (11/07) ok2st Version : 3x1.3GHz Reference Multiplication (Design, Prototype,Tests) (05/08) ???3st Version : LO Generation Crate (Design,Tests) (05/08)Manpower : H.Weddig, K. Czuba, (DESY), Fermilab ?