dorsal/arxiv
View SchemaMeasuring and Controlling the Energy Spread in CEBAF
| Authors | G. A. Krafft, J. -C. Denard, R. W. Dickson, R. Kazimi, V. A. Lebedev, M. G. Tiefenback |
|---|---|
| Categories | |
| ArXiv ID | physics/0009087 |
| URL | https://arxiv.org/abs/physics/0009087 |
| Journal | eConf C00082:TH205,2000 |
Abstract
As compared to electron storage rings, one advantage of recirculating linear accelerators is that the beam properties at target are no longer dominated by the equilibrium between quantum radiative diffusion and radiation damping because new beam is continually injected into the accelerator. This allows the energy spread from a CEBAF-type machine to be relatively small; the measured energy spread from CEBAF at 4 GeV is less than 100 parts per million accumulated over times of order several days. In this paper, the various subsystems contributing to the energy spread of a CEBAF-type accelerator are reviewed, as well as the machine diagnostics and controls that are used in CEBAF to ensure that a small energy spread is provided during routine running. Examples of relevant developments are (1) stable short bunches emerging from the injector, (2) precision timing and phasing of the linacs with respect to the centroid of the beam bunches on all passes, (3) implementing 2 kHz sampling rate feedback systems for final energy stabilization, and (4) continuous beam energy spread monitoring with optical transition radiation devices. We present measurement results showing that small energy spreads are achieved over extended periods.
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"abstract": "As compared to electron storage rings, one advantage of recirculating linear\naccelerators is that the beam properties at target are no longer dominated by\nthe equilibrium between quantum radiative diffusion and radiation damping\nbecause new beam is continually injected into the accelerator. This allows the\nenergy spread from a CEBAF-type machine to be relatively small; the measured\nenergy spread from CEBAF at 4 GeV is less than 100 parts per million\naccumulated over times of order several days. In this paper, the various\nsubsystems contributing to the energy spread of a CEBAF-type accelerator are\nreviewed, as well as the machine diagnostics and controls that are used in\nCEBAF to ensure that a small energy spread is provided during routine running.\nExamples of relevant developments are (1) stable short bunches emerging from\nthe injector, (2) precision timing and phasing of the linacs with respect to\nthe centroid of the beam bunches on all passes, (3) implementing 2 kHz sampling\nrate feedback systems for final energy stabilization, and (4) continuous beam\nenergy spread monitoring with optical transition radiation devices. We present\nmeasurement results showing that small energy spreads are achieved over\nextended periods.",
"arxiv_id": "physics/0009087",
"authors": [
"G. A. Krafft",
"J. -C. Denard",
"R. W. Dickson",
"R. Kazimi",
"V. A. Lebedev",
"M. G. Tiefenback"
],
"categories": [
"physics.acc-ph"
],
"journal_ref": "eConf C00082:TH205,2000",
"title": "Measuring and Controlling the Energy Spread in CEBAF",
"url": "https://arxiv.org/abs/physics/0009087"
},
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