dorsal/arxiv
View SchemaTransverse Beam Envelope Measurements and the Limitations of the 3-Screen Emittance Method for Space-Charge Dominated Beams
| Authors | J. G. Power, H. Wang, M. E. Conde, W. Gai, R. Konecny, W. Liu, Z. Yusof |
|---|---|
| Categories | |
| ArXiv ID | physics/0410013 |
| URL | https://arxiv.org/abs/physics/0410013 |
| DOI | 10.1016/j.nima.2005.02.034 |
| Journal | Nucl.Instrum.Meth.A546:345-355,2005 |
Abstract
In its normal mode of operation the Argonne Wakefield Accelerator Facility uses a high charge (10-100 nC), short pulse (3-5 psec) drive bunch to excite high-gradient accelerating fields in various slow-wave structures. To generate this bunch, we designed a 1.5 cell, L-band, rf photocathode gun with an emittance compensating solenoid to give optimal performance at high-charge; it has recently completed commissioning. More recently, we have begun to investigate the possibility of using this gun in a high-brightness, low-charge operating mode, with charge equal to approximately 1 nC, for high-precision measurements of wakefields. Two related measurements are reported on in this paper: (1) measurements of the transverse beam envelope are compared to predictions from the beam dynamics code PARMELA; and (2) investigations into the use of a modified 3-screen emittance measurement method that uses a beam envelope model that includes both space-charge and emittance effects. Both measurements were made for the 1 nC, 8 MeV beam in the drift region directly following the rf photocathode gun.
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"abstract": "In its normal mode of operation the Argonne Wakefield Accelerator Facility\nuses a high charge (10-100 nC), short pulse (3-5 psec) drive bunch to excite\nhigh-gradient accelerating fields in various slow-wave structures. To generate\nthis bunch, we designed a 1.5 cell, L-band, rf photocathode gun with an\nemittance compensating solenoid to give optimal performance at high-charge; it\nhas recently completed commissioning. More recently, we have begun to\ninvestigate the possibility of using this gun in a high-brightness, low-charge\noperating mode, with charge equal to approximately 1 nC, for high-precision\nmeasurements of wakefields. Two related measurements are reported on in this\npaper: (1) measurements of the transverse beam envelope are compared to\npredictions from the beam dynamics code PARMELA; and (2) investigations into\nthe use of a modified 3-screen emittance measurement method that uses a beam\nenvelope model that includes both space-charge and emittance effects. Both\nmeasurements were made for the 1 nC, 8 MeV beam in the drift region directly\nfollowing the rf photocathode gun.",
"arxiv_id": "physics/0410013",
"authors": [
"J. G. Power",
"H. Wang",
"M. E. Conde",
"W. Gai",
"R. Konecny",
"W. Liu",
"Z. Yusof"
],
"categories": [
"physics.acc-ph"
],
"doi": "10.1016/j.nima.2005.02.034",
"journal_ref": "Nucl.Instrum.Meth.A546:345-355,2005",
"title": "Transverse Beam Envelope Measurements and the Limitations of the 3-Screen Emittance Method for Space-Charge Dominated Beams",
"url": "https://arxiv.org/abs/physics/0410013"
},
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