1. High speed LWL connections for WP02
Holger Schlarb DESY
on behalf of
Wojciech Wierba
How to edit the title slide
Upper area: Title of your talk, max. 2 rows of the defined size (55 pt)
Lower area (subtitle): Conference/meeting/workshop, location, date, your name and affiliation, max. 4 rows of the defined size (32 pt)
Change the partner logos or add others in the last row.

2. Fast Interconnections XSIN/XTL
Contact person LLRF: Wojciech Wierba / Tomasz Jezynski
Assume that all Ethernet connections for LLRF have been taken into account
-> Infrastructure requirement document from Wojciech Wierba
Document does not contain LWLs for high speed data exchange:
Point-to-point connections between neighboring RF stations: 24
Bidirectional, daisy chain, minimum latency, SFPs, always 2 fibers
A1.I1 <-> A2.L1 <-> A3.L2 <->A4.L2<->A5.L2 <-> A6.L3<-> …<->A25.L3
Point-to-point connections to semi-central station:
4 x 6 RF stations grouped in L3 + interconnection, star topology
Fast distribution of charge readout from Toroids to L1/L2/L3 25
New, BPM system is not capable to deliver required charge resolution
Different topologies feasible
Longitudinal intra-train FBs (7)
Monitor -> Pre-procession unit -> LLRFn & LLRFn+1
Not considered: transverse IBTF/signals from photon diag & user exp.
Before you start editing the slides of your talk change to the Master Slide view: Menu button “View”, Master, Slide Master:
Edit the following 2 items in the 1st slide: 1) 1st row in the violet header: Delete the existent text and write the title of your talk into this text field 2) The 2 rows in the footer area: Delete the text and write the information regarding your talk (same as on the Title Slide) into this text field.
If you want to use more partner logos position them left beside the DESY logo in the footer area Close Master View

3. Upgrade of synchronization system
XSE -> XTL
directly to LO RF station
standard SMF fibers, but temperature stable enviroment
CW version of optical synchronization (sub 50fs…)
Number of connections (40)
1 fiber sufficient
Before you start editing the slides of your talk change to the Master Slide view: Menu button “View”, Master, Slide Master:
Edit the following 2 items in the 1st slide: 1) 1st row in the violet header: Delete the existent text and write the title of your talk into this text field 2) The 2 rows in the footer area: Delete the text and write the information regarding your talk (same as on the Title Slide) into this text field.
If you want to use more partner logos position them left beside the DESY logo in the footer area Close Master View

4. Layout longitudinal FBs for European XFEL
OXC
BBF Charge
BBF Osc.
BBF BBO
3 feedback loops to stabilize photoinjector laser & charge
Laser
Toroid
OXC
Gun I1
3rd
BC0
BC1
BC2 L1 L2 L2 L2 ~ L3
BAM
A/
A/
BCM EO
A/
BAM
BAM
BCM EO
A/
A/
A/
BAM
BAM
BCM
SPEC
LLRF
LLRF
uTCA
LLRF
LLRF
uTCA
LLRF
LLRF
LLRF
uTCA
BBF Gun
BBF I1
BBF L1
BBF L2
4 feedback loops to stabilize arrival times, compression, shape & energy
Before you start editing the slides of your talk change to the Master Slide view: Menu button “View”, Master, Slide Master:
Edit the following 2 items in the 1st slide: 1) 1st row in the violet header: Delete the existent text and write the title of your talk into this text field 2) The 2 rows in the footer area: Delete the text and write the information regarding your talk (same as on the Title Slide) into this text field.
If you want to use more partner logos position them left beside the DESY logo in the footer area Close Master View ~ L3 L3
COLL
BAM A A
BPMs
BAM
BPMs
BPMs
BPMs
BAM
LLRF
LLRF
uTCA
BBF L3
1 feedback loop to stabilize final beam energy

5. Interconnection between RF stations
Beam direction
51m
RF Station n-1
RF Station n
RF Station n+1
L3(n-1_1)
L3(n-1_2)
L3(n-1_3)
L3(n-1_4)
L3(n_1)
L3(n_2)
L3(n_3)
L3(n_4)
L3(n+1_1)
L3(n+1_2)
L3(n+1_3)
L3(n+1_4)
Slave
Master
Slave
Master
Slave
Master
Option 2
Option 1
Latency:
SFP in-> SPF out 130ns
LWL 60m RF(n) to RF(n+1) 300ns
Option 1: Master An ->Master An+1 430ns ideal
Option 2: Master An -> Master An+1 560ns acceptable, has additional advances
Option 1: Master An-> Master An+2 860ns
Option 2: Master An-> Master An ns
Option 1: Master A6-> Master A25 8.6us
Option 2: Master A6-> Master A us
Before you start editing the slides of your talk change to the Master Slide view: Menu button “View”, Master, Slide Master:
Edit the following 2 items in the 1st slide: 1) 1st row in the violet header: Delete the existent text and write the title of your talk into this text field 2) The 2 rows in the footer area: Delete the text and write the information regarding your talk (same as on the Title Slide) into this text field.
If you want to use more partner logos position them left beside the DESY logo in the footer area Close Master View

6. Central control unit for RF stations
Beam direction
LP1 - VS
LP2 - VS
LP3 - VS
LP4 - VS
A06
A07
A08
A09
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
A23
A24
A25
LLRF
Sub-central
LLRF
Sub-central
LLRF
Sub-central
LLRF
Sub-central
255m
Latency:
5 Station grouped 4*130ns+2*2*300ns = 1.72us
10 stations grouped 4*130ns+2*5*300ns = 3.5 us
20 station grouped 4*130ns+2*10*300ns = 6.5 us
Before you start editing the slides of your talk change to the Master Slide view: Menu button “View”, Master, Slide Master:
Edit the following 2 items in the 1st slide: 1) 1st row in the violet header: Delete the existent text and write the title of your talk into this text field 2) The 2 rows in the footer area: Delete the text and write the information regarding your talk (same as on the Title Slide) into this text field.
If you want to use more partner logos position them left beside the DESY logo in the footer area Close Master View

7. Charge signal from toroids
Beam direction
LP1 - VS
LP2 - VS
LP3 - VS
LP4 - VS W
A06
A07
A08
A09
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
A23
A24
A25
uTCA …
LLRF
Sub-central
LLRF
Sub-central
LLRF
Sub-central
LLRF
Sub-central
Latency:
Direct: 1*130ns+4000ns – 2660ns =1.46us + Toroid Elect.
255m
Before you start editing the slides of your talk change to the Master Slide view: Menu button “View”, Master, Slide Master:
Edit the following 2 items in the 1st slide: 1) 1st row in the violet header: Delete the existent text and write the title of your talk into this text field 2) The 2 rows in the footer area: Delete the text and write the information regarding your talk (same as on the Title Slide) into this text field.
If you want to use more partner logos position them left beside the DESY logo in the footer area Close Master View

8. LLRF SFP connections
Circa August muessen die Anforderung stehen
Juli
Before you start editing the slides of your talk change to the Master Slide view: Menu button “View”, Master, Slide Master:
Edit the following 2 items in the 1st slide: 1) 1st row in the violet header: Delete the existent text and write the title of your talk into this text field 2) The 2 rows in the footer area: Delete the text and write the information regarding your talk (same as on the Title Slide) into this text field.
If you want to use more partner logos position them left beside the DESY logo in the footer area Close Master View

9. Feedback concept for XFEL (test at FLASH)
Actuator
Digital FB
Controller
Q, X, Y
A/
Electron beam RF
Monitors
Preprocessing
& corrections
real time
Actuator
Digital FB
Controller
Q, X, Y
A/
Electron beam RF
Monitors
Preprocessing
& corrections
real time
Current structure at FLASH:
BBF acts real time only on set-points for RF field stabilization (no conflict)
Drawback: MIMO controller optimized for RF measurements
For beam based signals larger gain (different controller) possible
Action: MIMO controller which includes beam based signals (acts on SP & FF)
Before you start editing the slides of your talk change to the Master Slide view: Menu button “View”, Master, Slide Master:
Edit the following 2 items in the 1st slide: 1) 1st row in the violet header: Delete the existent text and write the title of your talk into this text field 2) The 2 rows in the footer area: Delete the text and write the information regarding your talk (same as on the Title Slide) into this text field.
If you want to use more partner logos position them left beside the DESY logo in the footer area Close Master View
Upstream FB can cause significant signal change on downstream monitor
Drawback: FB chain reduces gains for downstream FB & increases system latency
Some parameters can be measured with hire accuracy downstream
Action: Distributed FB structure, BBF signal are sent in parallel to downstream FB
FB state are exchange to one another
Preprocessing at LLRF station (and incomplete) -> integral part of monitor

10. Thanks for your attention
uTCA LLRF system (first test July 11)
Example XFEL uTCA base LLRF system
Calibration box of down-converter
To remove slow drifts (<100Hz)
Acknowledgement:
LbSyn Team
M. Bock, M. Bousonville, M. Felber, P. Gessler, T. Lamb, S. Ruzin, K.-H. Matthiesen, B. Schmidt, S. Schulz, …
LLRF Team
K. Czuba, M. Hoffmann, T. Jeyznski, F. Ludwig, W. Koprek,C. Schmidt, H. Weddig, ...
Front
Back
16bit ADCs
108 MHz
Before you start editing the slides of your talk change to the Master Slide view: Menu button “View”, Master, Slide Master:
Edit the following 2 items in the 1st slide: 1) 1st row in the violet header: Delete the existent text and write the title of your talk into this text field 2) The 2 rows in the footer area: Delete the text and write the information regarding your talk (same as on the Title Slide) into this text field.
If you want to use more partner logos position them left beside the DESY logo in the footer area Close Master View
Thanks for your attention
Additive jitter down-converter < 1mdeg (2.1fs)
Additive jitter from LO < 1.6fs (10Hz-10MHz)
SNR > 80dB, Isolation > -80dB, ADC clock jitter < 200 fs => signal integrity uTCA crate !!!

11. LLRF SFP connections Slave TC Master TC Master Slave
Previous RF station
Next RF station
BPM?
Toroid
Central unit
BBF
Before you start editing the slides of your talk change to the Master Slide view: Menu button “View”, Master, Slide Master:
Edit the following 2 items in the 1st slide: 1) 1st row in the violet header: Delete the existent text and write the title of your talk into this text field 2) The 2 rows in the footer area: Delete the text and write the information regarding your talk (same as on the Title Slide) into this text field.
If you want to use more partner logos position them left beside the DESY logo in the footer area Close Master View