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Accelerator Seminars

Accelerator Seminar Committee:
  Chair: Joe Grames / Past Chair: Anne-Marie Valente

    Members: Carlos Hernandez- Garcia, Gianluigi Ciovati, Vasiliy Morozov and
Steve Benson

 Accelerator Seminars will be scheduled weekly on Thursdays from 11:00 a.m. - 12:00 p.m.
If you would like to schedule a seminar, please contact Joe Grames for approval.


DATE: Wednesday, April 1, 2015

TITLE:The Beam-Beam Effect and Its Consequences for High Energy e-p Colliders such as the Lhec and FCC-he

SPEAKER: Edward Nissen, CERN Laboratory

TIME: 2:30 p.m.

LOCATION: CEBAF Center Auditorium

ABSTRACT: High energy e-p colliders like the proposed Large Hadron electron Collider (LHeC), and the proposed Future Circular Collider hadron-electron (FCC-he) collide high energy hadron beams with high energy electron beams for nuclear physics research. The beam-beam effect can have severe repercussions for both the electron and hadron beams in these colliders, and are modelled here using the strong-strong code Guinea-Pig. This work focuses on how the luminosities of the linac-ring designs for both the LHeC and FCC-he react to different waist shifts, bunch charges, and IR beta-functions. Simulations are also performed to measure the emittance growth of the stored hadron beams as they are repeatedly collided with an electron beam that is experiencing an offset jitter. The ramifications for the spent electron beam are also examined.


DATE: Thursday, April 2, 2015

TITLE:A High-Peak and High-Average Current, Low Emittance, Long Lifetime Electron Source for ERL Applications

SPEAKER: Xiangyun Chang, Far-Tech

TIME: 11:00 a.m.

LOCATION: CEBAF Center, Room F113

ABSTRACT: This research is to develop a replacement for the standard photocathode/laser source with a phase controlled thermionic source that eliminates the electron back-bombardment and the poor quality beam associated with the normal use of thermionic sources in RF guns. The source would only emit electrons during the peak portion of the RF electric field. The source would be CW, filling every RF bucket in the gun section, and capable of high peak and average current, low emittance beam. As an example this technique is applied in generation of JLab's magnetized beam for ion beam electron cooling. Some preliminary proof of principle experiment results are presented.


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