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NLCTA Facility Capabilities. E. R. Colby 5/18/09. Ti:Sapphire Laser System. E163 Optical Microbuncher. Cl. 10,000 Clean Room. NLCTA Overview. ESB. Counting Room (b. 225). L-1 (SNS). X-3 (2-pack). E-163. RF PhotoInjector. Gun Spectrometer. 30 feet. Space available for experiments.

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Nlcta facility capabilities

NLCTA Facility Capabilities

E. R. Colby 5/18/09


Ti:Sapphire Laser

System

E163 Optical Microbuncher

Cl. 10,000 Clean Room

NLCTA Overview

ESB

Counting Room

(b. 225)

L-1

(SNS)

X-3

(2-pack)

E-163

RFPhotoInjector

Gun Spectrometer

30 feet

Space available for experiments

Next Linear Collider Test Accelerator

Next Linear Collider Test Accelerator

20 feet

S

X-0

X-1

X-2

NLCTA capabilities:

* S-band Injector producing high-brightness 60 MeV beams (to ~100 pC); ultrashort, ultracold

* (4) x-band rf stations and >300 MeV of installed structures

* (2) L-band rf stations

* Skilled operations group with significant in-house controls capability


Capabilities
Capabilities

  • Electron Beam (from injector)

    • 60 MeV, 5 pC, dp/p≤10-4, e~1.5x1.5 mm-mrad, st~0.5 psec

    • Beamline & laser pulse optimized for very low energy spread, short pulse operation

  • Laser Beams

    • 10 GW-class Ti:Sapphire system (800nm, 2 mJ)

      • KDP/BBO Tripler for photocathode (266nm, 0.16 mJ)

    • Active and passive stabilization techniques

    • 5 GW-class Ti:Sapphire system (800nm, 1 mJ)

      • 100 MW-class OPA (1000-3000 nm, 80-20 mJ)

      • 5 MW-class DFG-OPA (3000-10,000 nm, 1-3 mJ)

  • Precision Diagnostics

    • Picosecond-class direct timing diagnostics

      • Micron-resolution beam diagnostics

    • Femtosecond-class indirect timing diagnostics

    • Picocoulomb-class beam diagnostics

      • BPMS, Profile screens, Cerenkov Radiator, Spectrometer

    • A range of laser diagnostics, including autocorrelators, crosscorrelators, profilometers, etc.


Nlcta laser lss
NLCTA Laser & LSS

  • Modest changes required to support EEHG Experiment:

  • Install evacuated transport line (vacuum components in-hand; pumping is in place)

  • Install second laser safety shutter (no new logic; add second driver + shutter)

  • Seek LSC approval for 1-3 micron operation in NLCTA vault and modify SOP


Eehg experiment and diagnostics are similar to the e 163 attosecond bunching experiment
EEHG Experiment and Diagnostics are similar to the E-163 Attosecond Bunching Experiment

  • Experimental Parameters:

  • Electron beam

    • γ = 127

    • Q ~ 5-10 pC

    • Δγ/g = 0.05%

    • Energy Collimated

    • εN = 1.5 mm-mrad

  • IFEL:

    • ¼+3+¼ period

    • 0.3 mJ/pulse laser

    • 100 micron focus

    • Z0 = 10 cm (after center of und.)

    • 2 ps FWHM

    • Gap 8mm

  • Chicane 20 cm after undulator

  • Pellicle (Al on mylar) COTR foil


Attosecond bunch train generation

Inferred Electron Pulse Train Structure Attosecond Bunching Experiment

Bunching parameters: b1=0.52, b2=0.39

Attosecond Bunch Train Generation

800 nm

400 nm

l=800 nm

First- and Second-Harmonic COTR Output as a function of Energy Modulation Depth (“bunching voltage”)

400 nm

800 nm

Left: First- and Second-Harmonic COTR output as a function of temporal dispersion (R56)

C. M. Sears, et al, “Production and Characterization of Attosecond Electron Bunch Trains“, Phys. Rev. ST-AB, 11, 061301, (2008).


Inferred electron beam satellite pulse

Machine stability supports sub-picosecond class e/ Attosecond Bunching Experimentg experiments

e.g. This cross-correlation measurement of the electron bunch profile took 5 minutes.

Inferred Electron Beam Satellite Pulse

sE

800 nm

Electron Beam Satellite!

I(t)

Q(t)

400 nm

Much of the visible spread is due to COTR intensity jitter (~Q2) rather than timing jitter


Preliminary beam quality measurement at eehg experiment location 20 pc 60 mev measured 4 13 09
Preliminary Beam Quality Measurement at EEHG Experiment Location 20 pC, 60 MeV,Measured 4/13/09

EEHG Location

Measurement Locations

  • Dispersion measurement was not yet working in downstream linac! Horizontal emittance had significant residual dispersion contribution

  • Beam at 60 MeV (drifting through all linac x-band structures)


Summary
Summary Location

  • Existing NLCTA laser systems meet EEHG experimental requirements

    • Modest extension of the LSS functionality required (shutter+driver)

    • Laser transport installation required (components in-hand)

  • Existing NLCTA electron beam quality meets EEHG experimental requirementsat 120 MeV, likely also at 60 MeV, with further machine studies.

    • Some additional beam diagnostics ahead of the EEHG experiment would speed commissioning

  • Sub-picosecond-class timing stability has been demonstrated

  • E-163 experience with near-IR e/g experiments is directly relevant and provides significant leverage

    • Experience designing experiments and hardware in this low-charge sub-psec regime

    • Wealth of advanced automated measurement software in LabVIEW and Matlab


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