Athos Machine commissioning workshop 01 02 2019 Summary

Athos Machine commissioning workshop 01. 02. 2019 Summary

• Christophe: • • • AMO will be modular: KB optic is mandatory. E-ions spectrometer will be available. • • Spectroscopy exp. Involving chirality molecules => need a pump source (when ? ) Single shot spectrum (or averaged) could be measured. Auger spectroscopy or ion yield spectroscopy ---- 4 Ideas of experiments ---At first First experiments => Short pulses of few fs and then Pump Laser; Q: What diagnostics needed ? 2 fs pulses with few fs delay (10 fs) (similar color or different) – Non linear spectroscopy (one fs to as and broad bandwidth (4 -8 e. V)) -> resolution of X TCAV TW pulse needs Moench detector

• Didier: • Achievements 2018 • Independent Athos shifts: some systems have to be checked • Up to 7 – 8 shifts for Athos until april: to be checked • Tools & panels: • Shifts in parallel to photon delivery: parallel operation at other lab like CERN (take experience)

Eduard • Beam dynamics: • Priority on 2 color modes ! (but also short pulses). • 69 shifts to 92 shifts (does it fit in 2019 -2020): How many shifts per year -> Didier has to fit these in DUO • Scan of the energy in TW mode? few % only • Specification for photon diagnostics • First CHIC Mode: Optical Klystron • Second chic mode: 2 colors mode in Oct 2020; TW mode for Dec 2020 • Table of available FEL parameters in 2020. (e. g. : SASE short 1 nm, 50 u. J, 2 -3 fs) • Important photon diagnositic: spectrum, time, • SW tools list to be done by Beam Dynamics

Sven • Switchyard commissioning: 13 shifts • matching into the septum (needs the WSC) -> Task 1 could be done before April • Feedback tool (not so easy because orbit & energy are mixed) • Quadrupoles also control compression: different settings for different FEL modes • Wire scanner preffered than screens (screen is 1 Hz) • R 56 control needs the BAM in the straight section (energy feedback on linac 2 => how much it affects Aramis)

Simona • Dechirpers: removal of residual chirp of compression (~30 Me. V) • LCLS have a gap of 1. 5 mm • 6 Dechirpers in Nov. 2019

Eugenio • Undulator Commissioning: • Define straight golden orbit: better than 5 um • Closed dispersion is mandatory for lasing; • K calibration: have a K-shell edge from a metal foil, where in front end? Optical hutch? • Polarization: polarizer and Analyzer; is chirality experiment feasible without polarimeter • TGU: monochromator or Spectrum from AMO

Carlo • Laser for 2 bunches: • Save Jaguar lifetime; What will be the rep. rate of Athos for 1 st lasing ? • 1 st lasing will be with the Jaguar • Best efforts for Jaguar: help in April Shutdown (from Timing Synch. And Control).

Qiao • Shifting C band by 12 -16 ns otherwise (2. 7 % and 1. 5 deg difference) • Proposal: Interface giving delta voltage and delta phase for 2 nd bunch • Implementation will take 3 -4 shifts before april ! Priority Task ! Knobs: RF pulse slopes Flattening the C band phase & amplitude in injector C band amplitude centering (=> lost of 1%) Extra step for second bunch control in amplitude and phase: Tuning by 10% ; +/-0. 6 deg (step ratio=1. 2 => step is 20% larger than macropulse) • Jitter due to slope ? ? ? • • •

Didier – 2 bunch timing • 49 timing events • MPS masking: losses => off beam events independent Aramis and Athos • Minimum requirements: few more events so that MPS is independent for April • Events should be discussed with photonics

Martin • Test of kickers : • Septum polarity • Kickers stability: 1. 7 ppm amplitude stability • Septum • Modes checking logic might be required for MPS.

Boris • Priority list for BPMs (minimum required for 1 st lasing): 11 or 9 • But also the BPM 8 (10 units) are needed for • 36 BPM required ; BPM 5 (only for one bunch); • New electronic: cheaper and more contact • Pickups are on time • Low Q BPM electronic : schedule OK • BPM 5 Electronic: Priority to second half of Undulator line ! • Commissioning: 4 shifts for BPM calibration in Nov. 2019 !

Gian Luca • BCM: state machine have to be updated; 2+2 shifts needed • Loss monitors & ICT: needs 2 bunches in Athos • Screens: mandatory for 1 st lasing • WSC: ½ commissioning shift for those in the dogleg • High level application: x % ready • D-SRM: fast camera ordered to distinguish 2 bunches (100 Hz)-> 2020 • Vacuum Ressources for ACHIP ?

Eike • Problem: BAG has to be informed when we change DRPS alarm • New thresholds: needs to identify the expected losses • Increase of DRPS alarm: a factor 5 at best; after additional shielding and more detectors.

Florian • MPS: ready in SY; Help from Operation for Panels; Losses in Athos provoke a delay in Athos Laser Event ! • Energy feedback after C band of Athos ? • Kick angle feedback for Athos • Orbit feedback in the SY: mix of orbit and dispersion; needs special approach

Paolo • • • C band: +/- 240 Me. V Polari. X: deflecting plane can be changed; Prototype structure are mechanically within specs; Athos X band structure: ready in 2019; Deflecting voltage proportional to longitudinal gradient X band BOC: X band deflector: resolution: 0. 8 fs at 55 MV Screen at 100 Hz: going on with BAG. Aperture of 8 mm needs good alignment. X band modulator design => C band delayed to spring 2020 X band modulator

Thomas • UE 38: polarization control; Kmax=3. 8 • To be controlled: K vs Gap; kick errors depending on shifts; Br=1. 12 T for radial magnet • Axial Magnet have better permeability (to reduce shift dependant kicks • CHIC Phase adavance: up to 2. 5 um ;

Tine • No major issues on ressources • BS data: • Camera servers are ready • Cabling: schematic required by electricians => problem for new systems (schematic mandatory) • Athos photonics: Ressource issues • Cameras: currently under devt

Chris • Gas monitors: to be installed in May 19; what electronics? • Low pulse energy 10 n. J has to be looked at. • Screen: can integrate K edge metallic foil • Spectrometer: spectrometer at AMO with 300 me. V resolution => spectral width and central wavelength; control is required • Pulse duration: not for day 1; we should rely on Polari. X • Polarization: Cookie box might not be the best device; not main priority

Claude • Front End: Aperture for pumping stages ? 6 mm ? • No Movable beam pipe as Alvra.

Christian • DCR 003: exchange pair of offset mirrors with a rollable half spherical mirror; add a mirror near FURKA for horizontal propagation • Science: correlated systems (charge, spin, orbitals); needs pump probe experiments; • RIXS: measure spectrum and direction of outcoming photons in a time resolved way; • Integrate low T (<10 K); high B field 1 T for XMCD; 5 m long spectrometer arm with 120 deg travel range (resolution 30 me. V at 1000 e. V). • 2 D RIXS map: spatially chirped FEL pulse on sample => 2 D RIXS • Avoid monochromator to minimize photon losses: autocorrelation with and without sample • Timeline: 1 Q 2021 for dummy chamber; Preffered mode for 1 st experiment: attosecond and 2 colors • WTO, CDR for vacuum chamber.

Kirsten • AMO: charged particle detection • Day 1: Injectors for gas phase (needle with rare gas); pair of KB mirrors; • Spectrometer: ion TOF: gives pulse duration but needs pulse energy • Photoelectron spectroscopy + hemispherical analyser: electron energies gives FEL bandwidth; energy; spectrum • Ion momentum spectroscopy: COLTRIMS => fragmentation studies • X ray spectrometer: under discussion • Requirements: <5 fs; tunable duration; >10 u. J; 2 colors; C, N, O

Summary 1/2 Ideal Experiment: Short pulses of few fs; 2 colors pulses Shifts Until April: 4 LLRF; 1 BD (Sven); diagnostic BCM (parallel to LLRF); Parallel Operation: lessons from other labs (CERN) Beam dynamics First Athos Mode= 2 Color Mode; TW mode in Dec 20 Wire scanner preferred than screens in Dogleg (more DRPS compatible? ) Dechirpers: priority for production and installation Aramis / Athos is required ! Undulator commissioning: metal foil for K-shell measurements; CHIC 1 st lasing laser will be the jaguar; November SD might be too short for Mizar acceptance test • LLRF: 3 -4 shifts required before april! Interface for step amplitude and phase control acting on bunch 2 • Timing: minimum requirements to have independent MPS Athos / Aramis feasible; Discussion on timing events with photonics is required ! • •

Summary 2/2 • • • BPM 5 and BPM 8 electronics on critical path ! Priorities ? • • Front End: Aperture for pumping stages ? 6 mm ? Some Diagnostics shifts require dedicated machine shifts DRPS: we loose a factor 2 or more in respect to current situation Switchyard Orbit feedback: special tools due to dispersion X & C band for spring 2020; 0. 8 fs resolution expected for X band; no mover for alignment UE 38 series: will be limited by magnet production Control Photonics Diagnostics: maybe ressources issues; no new camera server Photon Diagnostic Pulse duration: not for day 1; we should rely on Polari. X Undulator K calibration: what diagnostic ? spontaneous radiation divergence/ aperture? Pump laser Beam Dump Screen at 100 Hz ! DCR 003: exchange pair of offset mirrors with a rollable half spherical mirror; add a mirror near FURKA for horizontal propagation AMO: Requirements: <5 fs; tunable duration; >10 u. J; 2 colors; C, N, O AMO Spectro Day 1: pulse duration estimation