dorsal/arxiv
View SchemaEnergy stabilization of 1.5 GeV S-Band linac
| Authors | M. Kuriki, H. Hayano, T. Naito, T. Okugi, V. Vogel |
|---|---|
| Categories | |
| ArXiv ID | physics/0008034 |
| URL | https://arxiv.org/abs/physics/0008034 |
| Journal | eConf C000821 (2000) THA11 |
Abstract
KEK-ATF is studying low emittance, multi-bunch electron beam for the future linear collider. The energy instability of the 1.5 GeV linac has been a problem making the beam injection to the damping ring unstable. Because the unstable beam generates also large amount of the radiation, the beam current is limited by the KEK radiation safety policy much lower than what we expect. Stabilizing the S-band linac is therefore important not only to improve the beam quality, but also to clear the radiation safety limit to start the multi-bunch operation. We have made various modifications to solve the problem on the electron gun, modulator, klystron etc. For the modulator, we have developed a feed-forward controlled De-Q module. This module compensates the voltage jitter by controlling the deQ timing with a feed-forward circuit because the amount of the excessive charge up is strongly correlated to the charge up slope that can be measured prior to the deQ timing. The energy stability was examined and was improved by a factor of 3, from 0.6% to 0.2% of itself. Modification for the feed-forward circuit to get more stability was made. The test for the new circuit is in progress. For the long term instability, phase-lock system for klystron RF is being installed. In the test operation, it showed a good performance and compensate the phase drift less than 1 deg.
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"abstract": "KEK-ATF is studying low emittance, multi-bunch electron beam for the future\nlinear collider. The energy instability of the 1.5 GeV linac has been a problem\nmaking the beam injection to the damping ring unstable. Because the unstable\nbeam generates also large amount of the radiation, the beam current is limited\nby the KEK radiation safety policy much lower than what we expect. Stabilizing\nthe S-band linac is therefore important not only to improve the beam quality,\nbut also to clear the radiation safety limit to start the multi-bunch\noperation.\n We have made various modifications to solve the problem on the electron gun,\nmodulator, klystron etc. For the modulator, we have developed a feed-forward\ncontrolled De-Q module. This module compensates the voltage jitter by\ncontrolling the deQ timing with a feed-forward circuit because the amount of\nthe excessive charge up is strongly correlated to the charge up slope that can\nbe measured prior to the deQ timing. The energy stability was examined and was\nimproved by a factor of 3, from 0.6% to 0.2% of itself. Modification for the\nfeed-forward circuit to get more stability was made. The test for the new\ncircuit is in progress. For the long term instability, phase-lock system for\nklystron RF is being installed. In the test operation, it showed a good\nperformance and compensate the phase drift less than 1 deg.",
"arxiv_id": "physics/0008034",
"authors": [
"M. Kuriki",
"H. Hayano",
"T. Naito",
"T. Okugi",
"V. Vogel"
],
"categories": [
"physics.acc-ph"
],
"journal_ref": "eConf C000821 (2000) THA11",
"title": "Energy stabilization of 1.5 GeV S-Band linac",
"url": "https://arxiv.org/abs/physics/0008034"
},
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