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Direct Measurement of EEX: Matrix Elements & Bunch Length Analysis

In this study, preliminary EEX transfer matrix data and dispersion data along a line are analyzed. Direct measurements of EEX bunch length show resolution limits of less than 3pSec. A calibration method corrects observed signals for accurate bunch length derivation. Further efforts include refining output analysis and completing matrix element measurements. This is work in progress towards graduation goals.

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Direct Measurement of EEX: Matrix Elements & Bunch Length Analysis

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  1. EEX Update June 18 2008 Tim Koeth

  2. Data that we have • Preliminary EEX transfer matrix • (10/16 good) • Dispersion data along line - TBA • Prelimary ex ez direct measurement • Prelimary eZ eX raw data - TBA

  3. X3 (HTBX03)  BPM 28 Matrix

  4. Matrix 2 = redo

  5. Direct Measurement of EEX

  6. Bunch Length Measurements 5 cell off: 5pSec 5 cell on: </=3pSec ! Resolution limit of entire setup Thank you Jinhao & Alex ! Did not see a drastic reduction in momentum spread.

  7. Additional Broaden caused by limiting resolution caused by slit width Intensity Group velocity dispersion Time(ps) Very short OTR signal from e-bunch Broadened OTR signal from e-bunch Shown on the streak camera screen Just before the streak camera Immediate after the OTR screen

  8. Assume a real bunch length first (red line) • Modeled the observed OTR bunch length by streak camera by adding the influence of group velocity dispersion and limiting resolution due to slit width (Blue circles) • Use sum of the terms in quadrature to correct the observed signal and derive the real bunch length (blue dot)

  9. This is the calibration done for Range 1 (0.32ps/channel) with 550 nm LP filter

  10. Take upper limit as 1 pSec with TM110 Cavity On

  11. 86 keV rms

  12. OUTPUT HORIZONTAL EMITTANCE A work in progress X23 SPOT TM110 OFF X23 SPOT TM110 ON

  13. Tim’s to do list for graduation • Finish the Matrix Elements Measurements • X3 (HTBX03)  BPM 28 Transfer matrix • Dispersion measurement throughout entire line • Attempt at a direct EEX measurement • Complete EEX horizontal output analysis • Refine bunch length measurement ?

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