1–6 Jun 2025
Taipei International Convention Center (TICC)
Asia/Taipei timezone

Experimental investigation of longitudinal scraping of H- bunches via photo-detachment

WEPS016
4 Jun 2025, 16:00
2h
Exhibiton Hall A _Salmon (TWTC)

Exhibiton Hall A _Salmon

TWTC

Poster Presentation MC5.D09 Emittance manipulation, Bunch Compression and Cooling Wednesday Poster Session

Speaker

Parker Landon (Boston University)

Description

Longitudinal emittance growth is a significant challenge in RF linacs, especially for poorly bunched beams. This stems from particles occupying outer synchrotron oscillation orbits in the LBET, causing unwanted bunch-bunch interactions and degraded beam quality. To address this, we proposed using temporally spaced laser pulses to selectively photo-detach electrons from the longitudinal head and tail regions of H- ion bunches. This approach aims to reduce particle density in extreme orbits, enhancing beam uniformity and limiting emittance growth. Our experiments employed Fermilab's 'LaserNotcher' system at the font end of the linac, delivering 1.6 MW peak power with sub-nanosecond precision. By neutralizing the first and last half-nanosecond of several H- bunches, we measured their propagation injection into the booster. Measurements of pulse width, average height, and temporal spacing over booster cycles were compared between the scraped and unscraped bunches. Statistical analysis evaluated the results’ significance, highlighting the feasibility of laser-based scraping for future linac designs to achieve higher beam energies with improved emittance control.

Funding Agency

This work was supported by the U.S. Department of Energy under award No. DE-SC0015628

Region represented America
Paper preparation format LaTeX

Author

Parker Landon (Boston University)

Co-authors

Chandra Bhat (Fermi National Accelerator Laboratory) David Johnson (Fermi National Accelerator Laboratory) Todd Johnson (Fermi National Accelerator Laboratory) Jinhao Ruan (Fermi National Accelerator Laboratory)

Presentation materials

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