dorsal/arxiv
View SchemaDipole Wakefield Suppression In High Phase Advance Detuned Linear Accelerators For The JLC/NLC Designed To Minimise Electrical Breakdown And Cumulative BBU
| Authors | R. M. Jones, N. M. Kroll, T. Higo, Z. Li, R. H. Miller, T. O. Raubenheimer, J. W. Wang |
|---|---|
| Categories | |
| ArXiv ID | physics/0107049 |
| URL | https://arxiv.org/abs/physics/0107049 |
| Journal | Conf.Proc.C0106181:3810-3812,2001 |
Abstract
Recent experiments at SLAC [1,2] and CERN [3] have revealed evidence of significant deformation in the form of "pitting" of the cells of the 1.8m series of structures DDS/RDDS (Damped Detuned Structure/Rounded Damped Detuned Structure). This pitting occurs in the high group velocity (vg /c = 0.012) end of the accelerating structure and little evidence of breakdown has been found in the lower group velocity end of the structure. Additional, albeit preliminary experimental evidence, suggests that shorter and lower group velocity structures have reduced breakdown events with increasing accelerating field strengths. Two designs are presented here, firstly a 90cm structure consisting of 83 cells with an initial vg/c = 0.0506 (known as H90VG5) and secondly, an even shorter structure of length 60cm consisting of 55 cells with an initial vg /c = 0.03 (known as H60VG3). The feasibility of using these structures to accelerate a charged beam over 10km is investigated. The particular issue focussed upon is suppression of the dipole wakefields via detuning of the cell frequencies and by locally damping individual cells in order to avoid BBU (Beam Break Up). Results are presented on beam-induced dipole wakefields and on the beam dynamics encountered on tracking the progress of the beam through several thousand accelerating structures. [1] C. Adolphsen, ROAA003, this conf. [2] R.H. Miller et al, FPAH062, this conf. [3] L. Groening et al, MPPH039, this conf
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"abstract": "Recent experiments at SLAC [1,2] and CERN [3] have revealed evidence of\nsignificant deformation in the form of \"pitting\" of the cells of the 1.8m\nseries of structures DDS/RDDS (Damped Detuned Structure/Rounded Damped Detuned\nStructure). This pitting occurs in the high group velocity (vg /c = 0.012) end\nof the accelerating structure and little evidence of breakdown has been found\nin the lower group velocity end of the structure. Additional, albeit\npreliminary experimental evidence, suggests that shorter and lower group\nvelocity structures have reduced breakdown events with increasing accelerating\nfield strengths. Two designs are presented here, firstly a 90cm structure\nconsisting of 83 cells with an initial vg/c = 0.0506 (known as H90VG5) and\nsecondly, an even shorter structure of length 60cm consisting of 55 cells with\nan initial vg /c = 0.03 (known as H60VG3). The feasibility of using these\nstructures to accelerate a charged beam over 10km is investigated. The\nparticular issue focussed upon is suppression of the dipole wakefields via\ndetuning of the cell frequencies and by locally damping individual cells in\norder to avoid BBU (Beam Break Up). Results are presented on beam-induced\ndipole wakefields and on the beam dynamics encountered on tracking the progress\nof the beam through several thousand accelerating structures.\n [1] C. Adolphsen, ROAA003, this conf. [2] R.H. Miller et al, FPAH062, this\nconf. [3] L. Groening et al, MPPH039, this conf",
"arxiv_id": "physics/0107049",
"authors": [
"R. M. Jones",
"N. M. Kroll",
"T. Higo",
"Z. Li",
"R. H. Miller",
"T. O. Raubenheimer",
"J. W. Wang"
],
"categories": [
"physics.acc-ph"
],
"journal_ref": "Conf.Proc.C0106181:3810-3812,2001",
"title": "Dipole Wakefield Suppression In High Phase Advance Detuned Linear Accelerators For The JLC/NLC Designed To Minimise Electrical Breakdown And Cumulative BBU",
"url": "https://arxiv.org/abs/physics/0107049"
},
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