dorsal/arxiv
View SchemaBeam Diagnostics Systems For The National Ignition Facility
| Authors | R. D. Demaret, R. D. Boyd, E. S. Bliss, A. J. Gates, J. R. Severyn |
|---|---|
| Categories | |
| ArXiv ID | physics/0111049 |
| URL | https://arxiv.org/abs/physics/0111049 |
| Journal | eConf C011127 (2001) FRAT002 |
Abstract
The National Ignition Facility laser focuses 1.8 Mega-joules of ultraviolet light (wavelength 351 nano-meters) from 192 beams into a 600-micro-meter-diameter volume. Effective use of this output in target experiments requires that the power output from all the beams match within 8% over their entire 20-nanosecond waveform. The scope of NIF beam diagnostics systems necessary to accomplish this task is unprecedented for laser facilities. Each beam line contains 110 major optical components distributed over a 510 meter path, and diagnostic tolerances for beam measurement are demanding. Total laser pulse energy is measured with 2.8% precision, and the inter-beam temporal variation of pulse power is measured with 4% precision. These measurement goals are achieved through use of approximately 160 sensor packages that measure the energy at five locations and power at 3 locations along each beamline using 335 photodiodes, 215 calorimeters and 36 digitizers. Successful operation of such a system requires a high level of automation of the widely distributed sensors. Computer control systems provide the basis for operating the shot diagnostics with repeatable accuracy, assisted by operators who oversee system activities and setup, respond to performance exceptions, and complete calibration and maintenance tasks.
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"abstract": "The National Ignition Facility laser focuses 1.8 Mega-joules of ultraviolet\nlight (wavelength 351 nano-meters) from 192 beams into a\n600-micro-meter-diameter volume. Effective use of this output in target\nexperiments requires that the power output from all the beams match within 8%\nover their entire 20-nanosecond waveform. The scope of NIF beam diagnostics\nsystems necessary to accomplish this task is unprecedented for laser\nfacilities. Each beam line contains 110 major optical components distributed\nover a 510 meter path, and diagnostic tolerances for beam measurement are\ndemanding. Total laser pulse energy is measured with 2.8% precision, and the\ninter-beam temporal variation of pulse power is measured with 4% precision.\nThese measurement goals are achieved through use of approximately 160 sensor\npackages that measure the energy at five locations and power at 3 locations\nalong each beamline using 335 photodiodes, 215 calorimeters and 36 digitizers.\nSuccessful operation of such a system requires a high level of automation of\nthe widely distributed sensors. Computer control systems provide the basis for\noperating the shot diagnostics with repeatable accuracy, assisted by operators\nwho oversee system activities and setup, respond to performance exceptions, and\ncomplete calibration and maintenance tasks.",
"arxiv_id": "physics/0111049",
"authors": [
"R. D. Demaret",
"R. D. Boyd",
"E. S. Bliss",
"A. J. Gates",
"J. R. Severyn"
],
"categories": [
"physics.ins-det"
],
"journal_ref": "eConf C011127 (2001) FRAT002",
"title": "Beam Diagnostics Systems For The National Ignition Facility",
"url": "https://arxiv.org/abs/physics/0111049"
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