Modified PARMILA code for new accelerating structures

Takeda, H.; Stovall, J.

doi:10.1109/pac.1995.505554

Cited by 25 publications

(16 citation statements)

References 1 publication

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“…This indicates that a significant contribution to the rms emittance comes from the low intensity halo for the nominal beam optics, contrary to the round beam optics. These measurement results showing significant reduction both in rms emittance and halo are consistent with the multiparticle simulations using the PARMILA code [10]. It is evident that the multiparticle code with space charge routine is adequately simulating the physics process involved.…”

Section: Experimental Verification Of the Halo Formation Mechanismsupporting

confidence: 84%

Evidence of a halo formation mechanism in the Spallation Neutron Source linac

Jeon

2013

Phys. Rev. ST Accel. Beams

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Phys. Rev. ST Accel. Beams 5, 094201 (2002)] are verified experimentally through a series of emittance measurements performed during the drift tube linac tank 1 commissioning of the Spallation Neutron Source. This is a rare experiment evidence of a halo formation mechanism. As the simulation predicts, the emittance measurements clearly show a visible halo reduction as well as a significant rms emittance reduction when the proposed round beam optics is employed. The emittance measurement results are consistent with multiparticle simulations and also consistent with wire scanner results. These measurements serve as a valuable code benchmarking for a beam under an intense space charge effect.

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Section: Experimental Verification Of the Halo Formation Mechanismsupporting

confidence: 84%

Evidence of a halo formation mechanism in the Spallation Neutron Source linac

Jeon

2013

Phys. Rev. ST Accel. Beams

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“…Numerical simulation of a linac is performed with a fairly well matched beam with 50 000 to 100 000 macroparticles using the PARMILA code with a 3D space charge routine [12]. A space charge grid with (N x ¼ 8, N y ¼ 8, N z ¼ 20) is used for the simulation.…”

Section: The 4 ¼ 360 (Or 4 ¼ 1) Resonance For a High Intensity Linacmentioning

confidence: 99%

Fourth order resonance of a high intensity linear accelerator

Jeon

Groening

Franchetti

2009

Phys. Rev. ST Accel. Beams

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It is discovered that, for a high intensity beam, the 4 ¼ 360 (or 4 ¼ 1) resonance of a linear accelerator is manifested through the octupolar term of space charge potential when the depressed phase advance per cell is close to and below 90 but no resonance effect is observed when is just above 90 . To verify that this is a resonance, a frequency analysis is performed and a study of resonance crossing from above and from below the resonance is conducted. It is observed that this fourth order resonance is dominating over the better known envelope instability and practically replacing it. The simulation study shows a clear emittance growth by this resonance and its stop band. A proposal to GSI was made to perform an experiment to measure the stop band of this resonance using the UNILAC. The experiment confirmed this resonance and will be published in a separate paper.

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“…The particles are transported by using PARMILA [11], then the obtained particle distribution is inputted into the GPT simulation. Figure 6 shows the phase-space distribution at the exit of the DLS section, and Figure 7 represents the transverse emittance evolution through the DLS section.…”

Section: Particle Simulationmentioning

confidence: 99%