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Experimental Setup and Measurements for Two-Bunch Plasma Wakefield Acceleration at FACET

This document outlines the experimental setup and measurements taken during the Two-Bunch Plasma Wakefield Acceleration (PWFA) collaboration meeting held on May 20, 2013, by Mike Litos. The setup features a pre-ionized plasma column with specific parameters for both the drive and witness beams. Key focuses include charge and phase measurements, emittance growth, and experimental challenges faced, such as alignment uncertainties and gas pressure variations. The information is crucial for optimizing beam dynamics and enhancing acceleration techniques in PWFA experiments.

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Experimental Setup and Measurements for Two-Bunch Plasma Wakefield Acceleration at FACET

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  1. Two-Bunch PWFA Experimental Measurements & Procedures FACET PWFA Collab. Meeting 5-20-2013 Mike Litos

  2. Experimental Setup • Pre-ionized plasma column from laser • Aligned to e-beam • O(1mm) diameter • Full extent of oven • Beam prepared for two-bunches • “Boring” drive beam – not ionizing gas • Drive: sz ~ 35µm, charge ~ 7E9 • Witness: sz ~ 20µm, charge ~ 3E9 • Separation: 130µm • Lithium oven • plasma length: 30cm flat-top • plasma density: 5E16 cm-3 • Gas • plasma length: determined by laser • plasma density: continuous variation • plasma diameter: thin filament

  3. Experimental Measurements • Beam loading – charge + phase • Charge  Notch + Jaw Collimator • Phase  Notch + Jaw Collimator • Phase  Gas Pressure: fast • E-gain/charge tradeoff • Notch Collimator • Emittance growth measurement • Jaw Collimator • Head erosion (max achievable E-gain) • Emittance  Spoiler Foil • Pre-Ionized vs. Self Ionized  Laser • Transverse offset • TCAV, Dx Knob • Density scaling* • Oven Temp. + Pressure • Gas Pressure: fast • *need to find good Notch Coll. config. for each density

  4. (Potential) Experimental Challenges • Laser ionized buffer gas in ramps? • Trapped charge loading wake? • Loading from low-energy tail? • Transformer ratio measurement when decelerated charge off scale? • Complications due to thin plasma filament in gas? • Immeasurable radial density profile • Significant uncertainty in alignment

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