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CesrTA Low Emittance Program for Electron Cloud Studies

CesrTA Low Emittance Program for Electron Cloud Studies. Dan Gonnella Advisors: David Rubin, Mark Palmer Cornell University Laboratory for Elementary-Particle Physics. Outline. Project Overview Steps in the Process Theoretical Computations Why it’s Important Plans for the Future.

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CesrTA Low Emittance Program for Electron Cloud Studies

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  1. CesrTA Low Emittance Program for Electron Cloud Studies Dan Gonnella Advisors: David Rubin, Mark Palmer Cornell University Laboratory for Elementary-Particle Physics

  2. Outline • Project Overview • Steps in the Process • Theoretical Computations • Why it’s Important • Plans for the Future Dan Gonnella June 19, 2009 2

  3. Project Overview • GOAL: To understand the relationship between: • Beam Lifetime (Related to the touschek parameter) • Beam Emittance (Size of the beam) • Bunch Charge • Beam Energy Cornell LEPP Template June 19, 2009 3

  4. Project Goals Currently, the goal has been to re-create a plot of the Accelerating Voltage vs. the Touschek Parameter (inverse-lifetime). Cornell LEPP Template June 19, 2009 4

  5. Steps in the Process • Generate/analyze data from a lattice file and bmad/fortran program that does NOT include intrabeam scattering. • Generate/analyze data that does include intrabeam scattering. • The lattice file defines the energy, zero current emittances, damping times, energy spread, etc. • Using a lattice file for 2.085 GeV Cornell LEPP Template June 19, 2009 5

  6. Theoretical Computations • Output 20 sets of data for a given accelerating voltage and dynamic acceptance. • Fit data to the equation: Cornell LEPP Template June 19, 2009 6

  7. Experimental Data • We cam fit experimentally obtained data at different voltages to obtain the touschek parameter. • Data taken in the machine last Friday (6/12) at approximately 5 MV showed a touschek parameter of 0.800. Cornell LEPP Template June 19, 2009 7

  8. Final Data Intrabeam scattering occurs when particles in the beam collide with one another. It generally causes the beam size to grow and thus raise the emittance. Cornell LEPP Template June 19, 2009 8

  9. Why it’s Important • Low emittance operation is essential for the ILC research being done through the CesrTA project. • Ultra-low emittance means a higher particle density in the beam. • Higher particle density causes more particles to interact when collisions take place, resulting in higher luminosity. Cornell LEPP Template June 19, 2009 9

  10. Side by Side Comparison Cornell LEPP Template June 19, 2009 10

  11. Plans for the Future • Troubleshoot the program so the plot more closely matches the previously obtained plot. • Try to match the experimentally obtained touschek parameter to a theoretical emittance and dynamic acceptance. • This will allow us to understand more about the machine since we currently do not have a means of accurately measuring the emittance. Cornell LEPP Template June 19, 2009 11

  12. Questions? Cornell LEPP Template June 19, 2009 12

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