WIR SCHAFFEN WISSEN – HEUTE FÜR MORGEN Steps Towards Beam Commissioning: Timing & Synchronization Group Stephan Hunziker for the Timing & Synchronization Group 8447 presented by Volker Schlott :: Diagnostics Section Head :: Paul Scherrer Institut SwissFEL Commissioning Workshop, 21/22 March 2016 FHNW Campus Brugg-Windisch

Page 2 Main T+S Tasks -generation of mutually (ultra) stable and low noise reference signals (RF, optical) -(ultra) stable and low noise distribution of reference signals/clocks for LLRF, lasers, diagnostics, controls -laser synchronization -beam arrival time monitors (BAMs), (reference/synchronization & detection) -laser arrival time monitors (LAMs), (reference/synchronization & detection) Reference generation, distribution and synchronization system

Page 3 Status T+S -RF and pulsed reference signal generation √ (except opt. amp. for final # links) -phase stabilized optical links for RF signal distribution √ (rest by Oct./2016) -laser synchronization √ -diagnostics and controls ref./clock generation and distribution √ -BAMs and LAMs: see Rasmus’ talk -pulsed optical links for laser sync and BAM/LAM ref.: 1 link available for BAM, remaining links in 2017 (presently temporary solutions) -all systems are monitored extensively (electrical, optical, environmental parameters; phase and amplitude stability, RF/opt. power, alarms …), important parameters can be changed remotely Reference generation, distribution and synchronization system

Page 4 BAM FEBAM BEBAM FEBAM BE … gun LAM FE gun LAM BE Provided by T+S, covered by Rasmus’ talk Reference generation, distribution and synchorization system

Page 5 Reference generation, distribution and synchorization system

Page 6 Ready for installation -RF and optical master oscillators OMO with PLL, Rb standard -stable and ultra low noise RF reference signal extraction for S- and C-band references -24 stabilized optical links («cw links»), 8 x MHz and 16 x 2856MHz -10 free running optical links, 142.8MHz; coax fine distribution -various stable coaxial cables and fibers to Gun-Laser-Room and Technikraum -temporary reference solutions for…: 1 c-band station, x-band station, BAM 1, further BAMs and gun LAM -reserve cw links for laser sync -various environmental and optical / RF power monitors Reference generation, distribution and synchronization system

Page 7 Delayed -WTO call for tender for pulsed reference distribution -optical fiber amplifier (EDFA) → not required for temporary backup solutions (required by Q1/Q2 2017) -pulsed optical links for BAMs, LAMs, x-band RF and laser sync (except 1 PSI prototype for BAM 1) → replaced by temporary solutions -monitoring and control for pulsed system performance w/o pulsed reference distribution is expected to be slightly reduced (phase/timing drift) Reference generation, distribution and synchronization system

We depend on: -quality and delivery plans of vendors/companies -quiet environment (temperature, humidity, mechancial vibrations, EMI) -general installations (optical fibers, RF cables, mains, network) -space (racks, optical tables) -laser safety regulations and installations, clean room installations -clients (mainly the availability of lasers to be synchronized) Interfaces with our „clients“ and other systems / services: -space (racks, optical tables) at clients‘ sites -quiet environment (temperature, humidity, mech. vibrations, EMI) at clients‘ sites -general installations (opt. fibers, RF cables, mains, network) at clients‘ sites -clients‘ specifications for reference signals to be delivered by T+S -getting support (controls, electronics) -laser beam detection and rep rate actuators Our most important interfaces to (dependences on) other expert groups Page 8 (Which other systems are you depending on, which systems depend on you? How are the interfaces organized?) (Welches sind die wichtigsten Abhängigkeiten zu anderen Systemen? Wie sind die Schnittstellen organisiert?)

CategoryItemAvailable by (planning) Installed & ready as planned Delayed, ready by Risk OMO Laser2013 √ -failure → redund. RF MO2014 √ -- Laser PLL1st generation (analog)March 2016 √ -- Laser PLL2nd generation (analog, drift optimized)end 2016 √ -- Laser PLL3rd generation (digital)Q3/2017?? no Optical power amplifier EDFA for pulsed reference distribution2016Q1..Q2/ 2017 add. delay (WTO + ½ yr deliv.) Critical cables/fibers temp./humidity stable coax assemblies (installed by electricians and T+S) Feb... Oct √ -- Digitizer √ IOC hardware √ Crate √ EPICS Server √ Auxiliary controls √ Supporting infrastructure √ Expert panels √ Reference signal generation Page 9

CategoryItemAvailable by (planning) Installed ready as planned Inj. P1 LINAC P2 Delayed, ready by Risk CW optical links s-band March 2016 √ CW optical links c-band (fc/2) Mai 2016 (1 link) Oct √ Freq. doubler / power amplifier Feb (1 unit) Sept √ 1..2 months delay x-band reference distribution CW optical link s-band (fx/4=3GHz) Feb √ x-band reference generation freq. quadrupler / tripler / power amp. 9/12GHz (workaround for Sagnac- loop) Feb √ no (slightly more drift expected) PLOs 9/12GHz (Sagnac-loop) Q2/2017more delay than expected Critical cables/fiberstemp./humidity stable coax assemblies (installed by T+S) March 2016 … √ IOC hardware√ Crate√ EPICS Server√ Auxiliary controls√ Supporting infrastructure√ Expert panelsQ3/2016 …manpower LLRF Reference Distribution Page 10

CategoryItemAvailable by (planning) Installed & ready as planned Delayed, ready by Risk Trunk clock distribution for diagnostics (BLM, BPM, others) CW optical links 142.8MHz √ Fine distribution for diagnostics clock Couplers, splitters for RF sub-distribution √ Power amplifiers for diagnostics clock fine distribution √ IOC hardware √ Crate √ EPICS Server √ Auxiliary controls √ Supporting infrastructure √ Expert panels(√)? ADC Clock Distribution (BPM, BLM, diagnostics) Page 11

CategoryItemAvailable by (planning) Installed & ready as planned Delayed, ready by Risk Ref. distribution for pump laser CW optical link s-band (temporary for pump laser) √ Ref. distribution for gun laser Ultra-stable RF cables and fibers (T+S to gun laser room) √ Ref. distribution for BAM 1 Stab. pulsed optical link (PSI prototype) √ Ref. distribution for gun and pump lasers Stab. pulsed optical links (later for pump, gun laser sync, BAMs and LAMs) Q3/2017more delay than expected Temperature stable cables and fibers (T+S to gun laser room) Pulsed ref. for gun laser LAM √ IOC hardware√ Crate√ Firmwareexternal EPICS Server2017 Auxiliary controls2017 Supporting infrastructure 2017 Expert panelsend 2017 Laser/Pulsed Reference Distribution Page 12

Time window GoalDedicated beam needed Pre-requisitesTime frame 2x1 weekgun laser PLL testsnogun laser available for PLL tests (dedicated) March…April 2016 (1 st gen.) Q4/2016 (2 nd gen. PLL) 2x1 weekpump laser PLL testsnopump laser available for PLL tests (dedicated) March…April 2016 (gen. 1) Q4/2016 (gen. 2 PLL) 2 weeksmeasuring the sensitivity of certain beam parameters on ref. signal phase stability yesbeam, beam parameter measurements pre-FEL system characterization 2017 few weeksinstallation of pulsed ref. distribution noswitch laser sync from temporary to def. solution Q3/2017 Tests and Time for Testing Page 13

Page 14 Use of T+S Systems from Control Room (Operations) -What types of interventions on our system from the control room are required? (apart from monitoring) Sufficient spares -Realistically required degree of redundancy of our system? -We try to keep our sytem as open and flexible as (given the frame conditions) possible. We think that we would need some more spare units for optimum flexibility (e.g. spare stabilized optical links), i.e. to establish good stable (temporary, longer term, bypass …) solutions within short time(?) Sufficient manpower -Sufficient manpower is required for accomplishing the task of SwissFEL reference signal generation, distribution and synchronization system (incl. BAMs and gun laser LAM) as well as operating, continuously upgrading and maintaining the system Questions from our side

Page 15 T+S group Vladimir Arsov (100%, mainly BAM, planning) Florian Buechi (40%, various) Maik Kaiser (100%, various, installation, test) Stephan Hunziker (100%, various, planning, installation) Albert Romann (80%, LAM) Temporary Markus Heiniger (100%, various, installation, test) Uwe Kolb (100%, logistics, infrastructure, electronics/mechanical assembly) Support from other groups, external Andreas Schreiber (varying %, electronics/mechanical assembly, logistics, installation) Ronny Kramert (60%, c-band doubler development) Steffen Schnabel (varying %, laser PLL development support) Team