dorsal/arxiv
View SchemaRoom temperature accelerator structures for linear colliders
| Authors | R. H. Miller, R. M. Jones, C. Adolphsen, G. Bowden, V. Dolgashev, N. Kroll Z. Li, R. Loewen, C. Ng, C. Pearson, T. Raubenheimer R. Ruth, S. Tantawi, J. W. Wang |
|---|---|
| Categories | |
| ArXiv ID | physics/0108063 |
| URL | https://arxiv.org/abs/physics/0108063 |
| Journal | Conf.Proc.C0106181:3819-3821,2001 |
Abstract
Early tests of short low group velocity and standing wave structures indicated the viability of operating X-band linacs with accelerating gradients in excess of 100 MeV/m. Conventional scaling of traveling wave traveling wave linacs with frequency scales the cell dimensions with l. Because Q scales as l1/2, the length of the structures scale not linearly but as l3/2 in order to preserve the attenuation through each structure. For NLC we chose not to follow this scaling from the SLAC S-band linac to its fourth harmonic at X-band. We wanted to increase the length of the structures to reduce the number of couplers and waveguide drives which can be a significant part of the cost of a microwave linac. Furthermore, scaling the iris size of the disk-loaded structures gave unacceptably high short range dipole wakefields. Consequently, we chose to go up a factor of about 5 in average group velocity and length of the structures, which increases the power fed to each structure by the same factor and decreases the short range dipole wakes by a similar factor. Unfortunately, these longer (1.8 m) structures have not performed nearly as well in high gradient tests as the short structures. We believe we have at least a partial understanding of the reason and will discuss it below. We are now studying two types of short structures with large apertures with moderately good efficiency including: 1) traveling wave structures with the group velocity lowered by going to large phase advance per period with bulges on the iris, 2) pi mode standing wave structures
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"abstract": "Early tests of short low group velocity and standing wave structures\nindicated the viability of operating X-band linacs with accelerating gradients\nin excess of 100 MeV/m. Conventional scaling of traveling wave traveling wave\nlinacs with frequency scales the cell dimensions with l. Because Q scales as\nl1/2, the length of the structures scale not linearly but as l3/2 in order to\npreserve the attenuation through each structure. For NLC we chose not to follow\nthis scaling from the SLAC S-band linac to its fourth harmonic at X-band. We\nwanted to increase the length of the structures to reduce the number of\ncouplers and waveguide drives which can be a significant part of the cost of a\nmicrowave linac. Furthermore, scaling the iris size of the disk-loaded\nstructures gave unacceptably high short range dipole wakefields. Consequently,\nwe chose to go up a factor of about 5 in average group velocity and length of\nthe structures, which increases the power fed to each structure by the same\nfactor and decreases the short range dipole wakes by a similar factor.\nUnfortunately, these longer (1.8 m) structures have not performed nearly as\nwell in high gradient tests as the short structures. We believe we have at\nleast a partial understanding of the reason and will discuss it below. We are\nnow studying two types of short structures with large apertures with moderately\ngood efficiency including: 1) traveling wave structures with the group velocity\nlowered by going to large phase advance per period with bulges on the iris, 2)\npi mode standing wave structures",
"arxiv_id": "physics/0108063",
"authors": [
"R. H. Miller",
"R. M. Jones",
"C. Adolphsen",
"G. Bowden",
"V. Dolgashev",
"N. Kroll Z. Li",
"R. Loewen",
"C. Ng",
"C. Pearson",
"T. Raubenheimer R. Ruth",
"S. Tantawi",
"J. W. Wang"
],
"categories": [
"physics.acc-ph"
],
"journal_ref": "Conf.Proc.C0106181:3819-3821,2001",
"title": "Room temperature accelerator structures for linear colliders",
"url": "https://arxiv.org/abs/physics/0108063"
},
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