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M. Ferianis feb UCLA Overview of FERMI Diagnostics.

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Presentation on theme: "M. Ferianis feb UCLA Overview of FERMI Diagnostics."— Presentation transcript:

1 M. Ferianis feb UCLA Overview of FERMI Diagnostics

2 M. Ferianis feb UCLA ELETTRA

3 M. Ferianis feb UCLA FERMI footprint

4 M. Ferianis feb UCLA FERMI main parameters

5 M. Ferianis feb UCLA FERMI layout (...work in progress) Laser heater X-band linearizer spreader Energy/  H, V collimators dump

6 M. Ferianis feb UCLA  accurate photo-injector characterisation: emittance, charge profile, energy spread  seeded FEL scheme: whole bunch / fresh bunch (bunch core) calls for slice measurements: longitudinal charge profile, emittance, energy spread  transverse and longitudinal overlap between e - beam and laser high resolution BPM and bunch arrival monitors shot-to-shot feedbacks  stability of output FEL radiation  mm to sub-mm bunch length; currently two options: medium bunch: L B = 0.21mm (700fs)short FEL pulse long bunch: L B = 0.57mm (1.9ps)long FEL pulse Guidelines of diagnostics for FERMI

7 M. Ferianis feb UCLA Some relevant beam parameters for diagnostics *calculated assuming a normalized emittance of 1.2 mm mrad Medium Bunch Energy [MeV] Charge [nC] Bunch Length [ps / mm, FWHM] Transverse Size* 3x  x, v [mm] Entrance BC / Exit BC / Entrance BC / Exit BC / Long Bunch Entrance BC / Exit BC / Entrance BC / Exit BC /

8 M. Ferianis feb UCLA  Injector diagnostic beamline  BC1 diags  1 st RF 220MeV (down-stream BC1)  BC2 diags  2 nd RF 1.2 GeV  pre-FEL diagnostic station (downstream the spreader)  post-modulator diagnostic station  intra-radiator diagnostics (multipurpose pop-ins)  post radiator diagnostic station (FEL diags) Guidelines of diagnostics for FERMI

9 M. Ferianis feb UCLA Currently addressed issues on Diagnostics  review of FERMI parameters for diags.  the ELETTRA: dynamically growing...  overview of main FERMI diagnostics and associated measurements  integration of diagnostics into the machine, i.e. defining: dedicated machine optics vacuum chamber x-sections alignment strategy RF power needs for diags optical clock (laser pulse)  Conceptual Design Report write-up

10 M. Ferianis feb UCLA GunS0A/B Laser Heater X LINAC1 BC1 BC2 LINAC2 LINAC3LINAC4 SPRD FEL1 FEL2 Gun / injector Diagnostics Gun: Energy/energy spread Charge Spot size Position Bunch length Thermal emittance

11 M. Ferianis feb UCLA GunS0A/B Laser Heater X LINAC1 BC1 BC2 LINAC2 LINAC3LINAC4 SPRD FEL1 FEL2 Laser heater based diagnostics 775 nm seed laser derived from 1550 nm timing signal 120 kW, 10 ps Cross-polarized 5-period undulators Matching quads into heater Matching quads into linac YAG scree n, BPM Laser Heater : Electron beam timing relative to optical pulse Electron beam current profile Slice emittance W.Graves, MIT S.Spampinati, ELETTRA

12 M. Ferianis feb UCLA Energy, Energy jitter, Vertical slice emittance: BMP –collimator -screen Bunch length monitor: CSR output power detection to feedback loop Micro-bunching: CSR output for detection by THz spectrometer. Bunch arrival time measurements: fs Streak camera (ref pulse) wide band ring electrode with EO acquisition Bunch length, compressor tuning: BC1:1 st RF Deflector, streak camera for OSR BC2:2 nd RF deflector, EO sampling GunS0A/B Laser Heater X LINAC1 BC1 BC2 LINAC2 LINAC3LINAC4 SPRD FEL1 FEL2 BC1 & BC2 Diagnostics

13 M. Ferianis feb UCLA Diagnostics station at the end of linac : Vertical and Horizonthal RF deflecting cavity: Slice emittance CSR effect on horizonthal emittance Slice Energy Spread EOS bunch arrival time monitor: Bunch arrival time Arrival time jitter Bunch length Features: single shot (SLAC spatial convertion scheme, 100fsec resolution, MLO or SEED laser pulses as a probe) Overview of Elattra Diagnostics GunS0A/B Laser Heater X LINAC1 BC1 BC2 LINAC2 LINAC3LINAC4 SPRD FEL1 FEL2 DIAGS

14 M. Ferianis feb UCLA FEL 1&2 : Entrance of modulators: X,Y position and divergence: high precision cavity BPM Intra - radiators: e-beam and FEL radiation position and spot size: pop-in station with YAG screens e-beam X,Y position: cavity or button BPM microbunching and power growth: OTR/CTR monitorinig during operation CDR Exit of last radiator FEL radiation: (under development by user group): Single shot Spectral distribution monitor FEL radiation arrival time by respect to user laser determined by cross correlation techniques (De Silvestri) and advanced streak cameras. Overview of Elattra Diagnostics GunS0A/B Laser Heater X LINAC1 BC1 BC2 LINAC2 LINAC3LINAC4 SPRD FEL1 FEL2 DIAGS

15 M. Ferianis feb UCLA E B = 240 MeV;  n =1.5 mm mrad; a=20 mm  v g /c= (  L=1m =100ns) a=12.5 mm;  v g /c=0.0123(  L=1m =270ns) f RF =2.998 GHz;  D =45 m;  S =45 m;  =90 deg; Traveling wave deflector performances for low energy case Long bunch: 1.5 mm Short bunch: 0.4 mm L def =2m

16 M. Ferianis feb UCLA E B = 1.2 GeV;  n =1.5 mm mrad; a=20 mm,  =1   F =0.85  s a=12.5 mm,  =1   F =1.0  s f RF =2.998 GHz;  D =45 m;  S =45 m;  =90 deg; Standing wave deflector: performances for high energy case

17 M. Ferianis feb UCLA Cavity BPM in collaboration with M Poggi, INFN PD Beam pipe radius: to be defined according to Vacuum & Z beam current value R=6mm; ID gap (vacuum side) calls for R=3.5mm Extraction waveguide radial position: to be checked with simulation Optimum position for the RF connecotr on the waveguide Signal amplitude dependance on Q bunch (analytical eval.) Achievable mechanical accuracy on prototype: 10  m Setting up the RF test bench (Network BPM rigidly fixed to support coaxial moving wire, over ±1mm, acuracy and reproducibility <2  m prototype issues: no UHV, flanged + RF sliding contacts, equipped with SMA connectors (DC to 18 GHz)

18 M. Ferianis feb UCLA Principle: Isolated impedance-matched Ring Electrode installed in a „thick Flange“ Broadband, Position independent Signal One installed after the Gun, each magnetic Chicane (both BCs, the Collimator + before Undulator) BC´s: Energy Fluctuations -> Phase Fluctuations TOF Measurement: Resolution ≈ 0.2° or 0.4 ps Fast timing signals with sub ps resolution Very simple design of pickup Two output signal provided (left & right) ~550 mV/ps Phase Monitor Phase monitor (collaboration with Desy) Courtesy: H. Schlarb, F.Löhl

19 M. Ferianis feb UCLA EO acquisition of the wide band ring electorde signal ~ 1.3 GHz DAC DOOCS Master Laser Oscillator piezo- fiber- stretcher piezo- controller ~ ~ ~ 1.3 GHz10 GHz 200 MHz ~ ~ ~ 81 MHzlimiter ADC 100 MHz 12 / 14 Bit clock trigger DOOCS phase monitor EOM 200 MHz bias- voltage 10 kHz VM Courtesy: H. Schlarb, F.Löhl ~550 mV/ps 12 dB MLO RF master BPhM Mach-Zehnder interferometer Later: limiter

20 M. Ferianis feb UCLA Impact from vacuum chamber sections TypeDimensions LinaccircularD=30 mm CompressorsrectangularW=60mm, H=30mm UndulatorellipticalH=7mm W= tbd (vacuum)

21 M. Ferianis feb UCLA Timing and Synchronization


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