LLRF & Synchronization System + Roadmap On behalf of the LLRF and Laser based Synchronization team Presented by H. Schlarb 1

LLRF upgrades and developments at FLASH Outline LLRF upgrades and developments at FLASH - Decision to keep MO frequency at 9MHz => Software & Hardware will be identical to XFEL => Implementation of uTCA based system at FLASH 2011/2012 => XFEL software development has basically started! Highlights from FLASH operation Overview on synchronization + some recent results Roadmap (Tuesday …) 2

~ ~ Overview on LLRF systems at FLASH Station until 2009 Laser ~ ~ BC3 Gun ACC1 3rd BC2 ACC2 ACC3 ACC4 ACC4 ACC4 ACC7 A  A  A  A  A  A  LLRF LLRF LLRF LLRF LLRF LLRF Station until 2009 After upgrade 09/10 Shutdown 11/12 RF gun Simcon3.1 SimconDSP uTCA ACC1 SimconDSP (250kHz) ACC39 - (54MHz) ACC23 DSP (250kHz) ACC45 DSP/ATCA (250kHz/54MHz) (semi-dist.) ACC67 3

Upgrade of LLRF system Upgrade of all RF stations using SimconDSP controller Gun/ACC23/ACC45/ACC67 IF=250kHz, IQ-sampling scheme Sampling rate 81MHz (use averaging) RF control for 3.9GHz Probe, forward and reflected signals New RF down converter & LO generation with IF=54MHz, non IQ-sampling, LO = 3954MHz Sampling rate 81MHz 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 10 Channel 14bit ADCs 81 MHz clock rate 8 DAC, 14 bits 2 Gigalinks FPGA: XILINX Virtex II pro 4 4

Upgrade of LLRF system Upgrade of all RF stations using SimconDSP controller RF control for 3.9GHz New cabling in injector racks MO1 & MO2 cabling completed New rack & cabling for RF gun New rack & cabling for ACC1/ACC39 Enclosed racks for better temperature stability Parallel cabling for development system Careful noise investigation and power level adjustment of LO and RF signals RF gun ACC39 ACC1 MO ACC39 DWC 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 5 5

Upgrade of LLRF system Upgrade of all RF stations using SimconDSP controller RF control for 3.9GHz New cabling in injector racks Upgrade & unified FPGA controller firmware Multiple feed forward table (main/beam loading/correction) Multiple setpoint table (main/beam based correction) Model based Multiple In Multiple Out (MIMO) controller Charge correction & intra-train beam based feedback Exception & Error handling, limiters Error and status displays Scheme of LLRF RF controller Feed forward table architecture 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 6

Upgrade of LLRF system Upgrade of all RF stations using SimconDSP controller RF control for 3.9GHz New cabling in injector racks Upgrade & unified controller firmware Unified and new control software New C++ architecture for front end server LLRF library based on SysML approach Unified naming convention Automatic firmware downloads Finite State Machine for automation High level software: diagnostics, calibration… DAQ integration Model based learning feed forward (LFF) Loop phase/gain correction Piezo control for cavity detuning comp. … Voltage [MV] Phase [deg] LFF off 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 LFF on 1st bunch 7 7

Upgrade of LLRF system Upgrade of all RF stations using SimconDSP controller RF control for 3.9GHz New cabling in injector racks Upgrade & unified controller firmware Unified and new control software Beam signals integrated Charge signals Bunch Arrival time Pyro signal Real time FB with matrix Limiter on Ampl/Phase corr. IIRF filters Rep. rate adaption Charge scaling of beam load compensation table Control software ~ 90 % completed Most of features are commissioned 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 8

Upgrade of LLRF system Upgrade of all RF stations using SimconDSP controller RF control for 3.9GHz New cabling in injector racks Upgrade & unified controller firmware Unified and new control software Beam signals integrated Piezo drivers new driver for ACC1 / ACC7 DAQ server for detuning measurements Several piezo studies performed Active compensation of ringing DC voltage added for static detuning Control software ~ 80 % completed But many features not fully commissioned 9

Upgrade of LLRF system 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 10 10

LLRF Control Tables – software philosophy - Process control via FSM Operator & FSM & LLRF expert Setpoints: A, & Parameters: timing, … - As larger impact on cavity/coupler the more restriction on table/table generation - Separation of physics cause of effect - Easier exception handling Static detuning correction Dyn. detuning SP filling correction Resonance filling Slow BBF correction VM offset corr. DCW calibration BLC adaptation Beam based SP correction Model based FF & SP tables ratio ≤ Learning Feed forward Bunch Pattern SP_BBF table SP_USER table SP_CORR table ≤ SP table FF table FF_CORR table FF_BLC table ≤ ≤ ≤ Slow FB loops for parameter optimization Q MPS + + Q - Beam signals a b c d Rot FF-total table Loop G/ MPS ≤ - + Field detection Controller Rot ≤ DAC DAC 11

On-crest acceleration phase Definition and adjustment (min. energy spread/ max acceleration) Drifts of down converter + cables (~1-2deg) -> hardware changes 2011 Difference between Setpoint and Vectorsum -> software done To some extend drifts from laser arrival time + conv. -> hardware changes 2011 On-crest phases a dominated by operation set-point (support panel) Remark: 1% ACC1 gradient change  3.5 phase difference for all downstream modules 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 12 12

FLASH results: Learning Feed Forward 13

FLASH results: Learning Feed Forward 4 ps 0.5 ps 14

FLASH results: with MIMO (ACC39) Value Repetitive error (aver. 100 macro-pulses) Pulse to pulse (each time stamp) Abs. Rms PKPK Limited by ADC bit noise 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 LFF off 15 15

FLASH results: Performance LLRF Arrival time measurements Typically values 60-100fs rms from injector 60-80fs rms behind BC2 50-60fs rms exit LINAC Pulse to pulse about factor of 2 better than last year Across bunch train dA/A~7e-4 (LFF was off 250kHz@0.5nC) RMS timing jitter 400fs 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 16 16

FLASH results: Gradient stability ACC1/ACC39 shutdown shutdown 17

Intended working point FLASH results: Performance at 4.5mA operation Beam Current (mA) 1 2 3 4 5 Gradient change over 400us (%) -3 -5 +3 +5 Gradient Tilts vs Beam Current (ACC7) Intended working point ~2.5% Characterisation of solution by scanning beam current model benchmarking Flat gradient solution achieved 4.5 mA beam

FLASH results: Performance at 4.5mA operation 15 consecutive studies shifts (120hrs), and with no downtime Time to restore 400us bunch-trains after beam-off studies: ~10mins Energy stability with beam loading over periods of hours: ~0.02% Individual cavity “tilts” equally stable Energy stability over 3hrs with 4.5mA ~0.02% pk-pk 9 Feb 2011 Concept with toroid based BLC scaling worked excellent (at least up to 4.5mA) 19

~ ~ FLASH results: Beam base FB (with MIMO & LFF) Laser ~ ~ BC3 Gun ACC1 3rd BC2 ACC2 ACC3 ACC4 ACC7 Latency of system Exit of linac & out-of-loop Both intra-train FB on MIMO controller Repetitive pkpk deviation < 100fs < 22 fs 20

Open software developments: Next steps (till end of FLASH run) Firmware & Software for RF gun (consistent to SRF) Automation and permanent usage of DC/AC piezo operation MIMO controller including BBF Setpoint correction during filling / resonance filling using phase slopes Forward peak power reduction Improved error handling Rapid VS calibration Improved DAQ implementation and long term statistics Error budget management & optimization of loops for LLRF parameters LO table correction

Layout of uTCA LLRF system 1. Project phase (19“ modules, uTCA without backplane) 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 Complicated cable management - LLRF RTM backplane concept 22 22

Layout of uTCA LLRF system 2. Project phase (19“ modules, uTCA with backplane) 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 Higher risk of signal degradation … (for main linac eventually only) TT Interne Diskussion Frank Ludwig, Tomasz Jezynski, DESY 23 23

Activities and milestones scheduled for Jan. 11 -> Jun. 11 Main components of uTCA based LLRF system: Typically 2-3 revision required for each, 3-6 month per revision Components With whom Status Expected uTCA crate (EMI/PS noise/…)* indu./indu. rev1/prod. Jun/Jan11 ADC board (16bit/10Ch)* with industry revision 1 Mar. 2011 Low noise DCW* in-house/indu. start rev 1. May 2011 Vector modulator* collaboration routing Mar. 2011 AMC controller collaboration production Feb. 2011 LO generation (19’’)* collabr./in-house design May 2011 LO distribution (19’’) collabr./in-house design Mar. 2011 LO generation (RTM)* industry contacted Aug. 2011 Calibration unit (19’’)* collabr./in-house design Apr. 2011 uTCA back plane* collabr./indu. production May 2011 Piezo driver board collabr. design June 2011 * Indicates ultra high performance (<150dBc/Hz , clk ~200fs , <10fs stab., -80dB cx-talk) usually not available in industry (close collaboration / exchange important / few companies)

Software developments uTCA 2011 Most important is the transition from SimconDSP -> uTCA!!! Firmware & Communication protocols & Front-end server Middle layer server can be move to front-end CPU Implementation of new Timing/Clock 2012 New software developments feasible Down-converter calibrations (directly into performance) Make us of Pfor/Pref within controller (e.g. real time quench det./model) 30Hz operation with 9MHz tables & 96 channels (DSP???) AMTF software developments for routine measurements Upgrade of beam base feedbacks … 2013/2014 Control software for 25 RF stations XFEL Energy management …

uTCA based LLRF Systems & schedule 2011 REGAE (May-July) 1 Crate (8) FLASH ACC1/ACC39 (June-Sep) 1 Crate (24/12) Shutdown 12.09. PITZ TDS (Aug-Sep) 1 Crate (8) CMTB (Sep) 1 Crate (24) FLASH ACC23/ACC45 (Sep-Dec) 2 Crates (48/48) DWC/ADC? 2012 Freeze final LLRF design FLASH ACC67 1 Crate (48) FLASH ACC45 1 Crate (48) Semi-distr. AMTF (March) 3 Crates (24/24/24) Final revision (Oct.) Start mass production 2013 XFEL L0 2 Crates (36/36) 2014 XFEL L1-L3 50 Crates (96)

~ ~ ~ Synchronization system approaches t f = t f 1) RF distribution f ~ 100MHz …GHz ~ 2) Carrier is optically ~ MZT f ~ GHz 3) Carrier is optically + detection ~ f ~ 200 THz 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) Pulsed source f ~ 5 THz OXC Mode locked Laser 27 27

Hybrid system for FEL facilities Reliability RF System CW optical Pulsed system Performance Costs 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 28 28

Layout of XFEL Synchronization System 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 29 29

Optical synchronization system EDFL, soliton, t~200fs, f=216MHz SESAM, P > 100mW, phase noise < 5fs (1kHz) Laser MLO MO-RF Narrow Band. Free space distribution + EDFA Distribution Dispersion comp., Polarization contr., Collinear bal. opt. cross-corr. Optical link Optical link Optical link <5fs <5fs <5fs Other lasers Direct End-station LO-RF Two color bal. Opt. cross-corr. EOMs/ Seeding Direct/ Interferometer 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 Laser pulse Arrival beam/laser DWC/Kly FB A &  cavity Desired point-to-point stability ~ 10 fs Main issue: robustness, stability and maintainability  Prototype at FLASH 09.12.2010, Daresbury, “Rule of lasers in particle beam research” Holger Schlarb, MSK, DESY 30 30

Optical Synchronization System Installation at FLASH Master Laser Oscillator (RF locked to MO) Free space distribution system to 16 ports Optical Links: 6 stabilized using OXC & 1 passive Front-ends 4 Bunch arrival time monitors (BAM) OXC for INJ / TiSA lasers RF locked for TiSA (HHG) (not yet completed) 31

Bunch Arrival Monitor Detector 32

Bunch Arrival Monitors Front-end Electronics Top view to LLRF Bottom view 33

Fiber Link Stabilization (RF based) Time domain Frequency domain Every odd harmonic destructively interfere Amplitude detection with mixer (sign) of high harmonics (45th) allow to measure link delay variations Scheme RF link 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 34 34

Fiber link stabilization (RF based) Optics section 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 LO generation In-loop Detector branch Digital FB loop Out-of-loop Detector branch 35 35

Fiber link stabilization (RF based) Error between in-loop and out of loop ~ 0.8fs rms, 4.8 fs pkpk, (30 m long fiber in laboratory, not stabilized, only monitored) In-loop / 2 Out-of-loop 38 hours difference 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 overcomes AM-PM conversion in photo-detectors several advantages compared to OXC link (low opt. power, monitoring possible, simple disp. comp.) low cost version link with still high performance 36 36

~ ~ ~ RF generation from optical pulses f = n*frep PD BPF frep Time domain Frequency domain Phase noise 100fs Photo Detector Bandwidth PD T = 5ns = 1/frep frep Direct conversion with photo detector (PD) Low phase noise (to be proven at end-station) Temperature drifts (0.4ps/C°) AM to PM conversion (0.5-4ps/W) Potential for improvement (corporation with PSI) laser pulses f = n*frep PD BPF ~ ~ ~  frep f = n*frep Sagnac loop interferometer balanced optical mixer to lock RF osc. insensitive against laser fluctuation Very low temperature drifts Results: f=1.3GHz jitter & drift < 10 fs rms limited by detection Remark: much easier at hire frequencies … MZI based balanced RF lock new scheme, under investigation 37 37

Results double balanced MZI-L2RF Sensitive to environment 2fs pkpk But insensitive to laser power But 0.8 ps/K temperature dependence 38 38

Thanks for your attention 39

~ ~ Beam Based Feedback Installation Beam Based Feedbacks: Laser ~ ~ BC3 Gun ACC1 3rd BC2 ACC2 ACC3 ACC4 ACC7 Toroid Toroid Toroid A  A  A  A  BAM BAM BCM BAM BCM BAM LLRF LLRF LLRF LLRF LLRF Beam Based Feedbacks: BAM before BC2 corrects phase in RF-Gun BAM and BCM after BC2 simultaneously correct amplitude and phase in ACC1 and 3rd harmonic BAM and BCM after BC3 correct amplitude and phase in ACC23 Results from BBF running at BC2 40

Master Laser Oscillator (MLO) Pulse generation and distribution Promising: OneFive ORIGAMI-15 Repetition rate: 216,66MHz Average power: > 100mW Pulse duration: p < 150 fs Integrated timing jitter < 5 fs in the interval [1 kHz; 10MHz] Mechanically robust, easy to maintain 41

Fiber Link Stabilization (optically) 216 MHz Er-doped fiber laser Det 1 Det 2 - Balanced optical cross-correlator 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 J. Kim et al., Opt. Lett. 32, 1044-1046 (2007) 42

Fiber Link Stabilization (optically) 3 generation of opto-mechanics typical in loop jitter ~ 1-2 fs rms (also smaller) Experience: Operate reliably Ampl. FB to be add Smaller open questions XFEL: Dispersion management need to be improved Delay stage too short for long links and large temp. changes 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 Courtesy: M. Bock 43 43

Low Level RF Control Systems Intra-train BBF Implementation Toroid LLRF Control Tables Charge Measurement Qtoroid ADC9 Pyro SP Table LLRF SP Table BCM I Q ΔU ΔΦ Peak Detection Gating Charge Correction ADC10 - Transfer Matrix SP Signal Modulation BAM tsample Qnom ΔA/A Δt Optical Link I Q FPGA MPS 44

BBF Calibration Transfer Matrix Determination BC2 Gun ACC1 ACC39 ? BAM Pyro A/ A/ t C/z Actuators Monitor system scanning measure ACC1 ACC39 extract 45

Open issues: observation QL changes Voltage change ACC45 from 67MV to 255MV (~4MV/m -> ~15MV/m) ACC4 ACC5 Decay over time No change at all 17MV/m 2.6 -> 3.0 (16%) 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 2MV/m 10 min 10 min Cause need to be investigated (likely main coupler antenna position change due to thermal expansion) 46 46

Open issues: Cavity pre-detuning using DC piezo voltage Successfully used to change pre-detuning 10V 0V 0V 10V Is accompanied with Ql changes => detuning via Lorenz force detuning For some cavities orbit changes are observed  reduces SASE, but simple corrector sufficient  global orbit FB essential for reproducibility of machine operation Several studies on detuning compensation during macro-pulse Since 4 weeks PZT for ACC67 in operation (DC/AC) 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 47 47