dorsal/arxiv
View SchemaMinimization of Transverse Wakefields in the NLC Accelerator Structures
| Authors | R. M. Jones, R. H. Miller, J. W Wang |
|---|---|
| Categories | |
| ArXiv ID | physics/0208066 |
| URL | https://arxiv.org/abs/physics/0208066 |
Abstract
The progress of a multiple bunches of electrons through several thousand accelerator structures results in a wakefield which if left unchecked will kick successive bunches off the axis of the accelerator and can at the very least dilute the final luminosity of the final colliding beams, or at worst can lead to a BBU (Beam Break Up) instability. In order to damp the wakefields to acceptable levels for travelling wave structures we detune the frequencies of the cells and we couple out the field to four adjacent manifolds. Optimizing the manifold-cell coupling for several hundred cells and changing the bandwidth parameters of the distribution has in previous structures been achieved by a process of trial and error. Here, we report on an optimized Fortran code that has been specifically written with the aim minimizing the sum of the squares of the RMS and standard deviation of the sum wakefield. Sparse matrix techniques are employed to reduce the computational time required for each frequency step. The wakefield is minimized whilst ensuring that no significant local surface heating occurs due to slots cuts into the accelerator cells to couple out the wakefield.
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"abstract": "The progress of a multiple bunches of electrons through several thousand\naccelerator structures results in a wakefield which if left unchecked will kick\nsuccessive bunches off the axis of the accelerator and can at the very least\ndilute the final luminosity of the final colliding beams, or at worst can lead\nto a BBU (Beam Break Up) instability. In order to damp the wakefields to\nacceptable levels for travelling wave structures we detune the frequencies of\nthe cells and we couple out the field to four adjacent manifolds. Optimizing\nthe manifold-cell coupling for several hundred cells and changing the bandwidth\nparameters of the distribution has in previous structures been achieved by a\nprocess of trial and error. Here, we report on an optimized Fortran code that\nhas been specifically written with the aim minimizing the sum of the squares of\nthe RMS and standard deviation of the sum wakefield. Sparse matrix techniques\nare employed to reduce the computational time required for each frequency step.\nThe wakefield is minimized whilst ensuring that no significant local surface\nheating occurs due to slots cuts into the accelerator cells to couple out the\nwakefield.",
"arxiv_id": "physics/0208066",
"authors": [
"R. M. Jones",
"R. H. Miller",
"J. W Wang"
],
"categories": [
"physics.acc-ph"
],
"title": "Minimization of Transverse Wakefields in the NLC Accelerator Structures",
"url": "https://arxiv.org/abs/physics/0208066"
},
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