Author: Yang, X.
Paper Title Page
MOPPP050 Physics Results of the NSLS-II Linac Front End Test Stand 673
  • R.P. Fliller, F. Gao, J. Rose, T.V. Shaftan, X. Yang
    BNL, Upton, Long Island, New York, USA
  • G. Blokesch
    PPT, Dortmund, Germany
  • C. Piel
    RI Research Instruments GmbH, Bergisch Gladbach, Germany
  Funding: This manuscript has been authored by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The NSLS-II linac is produced by Research Instruments and will be commissioned in the spring of 2012. As part of the procurement, the linac front end consisting of the gun, prebunching cavity, and diagnostics was delivered early to BNL for testing. We designed a short beamline to supplement the Front End diagnostics to characterize the beam. These tests were instrumental in demonstrating the functioning of the gun, pinpointing technical problems at an early project stage and gaining experience with the linac gun by BNL staff prior to commissioning of the full linac. In this report we show the results of the tests, including charge, bunch length, and transverse emittance measurements and compare them with the relevant linac specifications.
TUPPP090 Studies of Controlled Laser-induced Microbunching Instability at Source Development Laboratory 1798
  • S. Seletskiy, B. Podobedov, Y. Shen, X. Yang
    BNL, Upton, Long Island, New York, USA
  We present the studies of controlled microbunching intentionally induced on the beam by the photocathode laser with modulated longitudinal profile. Varying the depth and frequency of longitudinal modulation of the laser pulse allowed us to observe the development of microbunching instability at BNL Source Development Laboratory (SDL) in the controlled environment. That allowed us to benchmark the model of the microbunching gain for the first time. In addition to that, we demonstrated for the first time a constructive work of a so-called longitudinal space charge amplifier, which in case under consideration can be utilized for enhancement of linac-based sources of THz radiation.