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| Conference Presentation (After Call) | FZJ-2021-01619 |
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2020
Abstract: <h4 id="description-of-request">Description of request</h4><p>Orbit control is an essential part of COSY operation. Orbit Correction software (OC) was conceived at IKP and integrated in new EPICS control system in collaboration with Cosylab d.d. and has allowed COSY to deliver required orbit parameters to multiple experiments.</p><p>The performance of the Orbit Correction hinges on several components, such as ring steerer control, steerer calibration, beam position monitoring (BPM) system measurements, BPM calibration, orbit response matrix (ORM) modeling and thus COSY optics modeling and ORM measurement.</p><h4 id="goals">Goals</h4><p>During previous OC operation indications arose pointing to non-optimal steerer calibration, precisely for the SH27 and newer BLW-D1/3 steerers. One goal of this beam time is to check steerer calibrations using the BPM data and test with closed orbit bumps. The integration of corrector magnets of the 2 MeV cooler is considered a necessary next step to further improve orbit control.</p><p>A closed orbit correction at injection energy has not yet been performed with the new system. If applied routinely it could improve the injection efficiency and reduce time for machine development. Another goal of this beam time is to characterize the optics model and steerer calibration at injection energy; measure orbit response matrix and compare it to the model; find optimal OC configuration to optimize injection orbit towards higher beam current, and handle injection scenarios e.g. with and without 100keV and 2MeV solenoids active in the optics.</p><p>Matching the model-based and measured ORMs is the final goal of the beam time. Using a selection of energies in the range feasible in COSY a measurement of ORM should be performed and compared to the model-based calculation. Check and optimization of the model would be possible with this data. Tentative selection of momenta are the maximum momentum at 3.0GeV/c, momentum close to the gamma-transition at 2.2GeV/c, momentum used for EDM at 0.97GeV/c, momentum used for PANDA target at 0.8GeV/c. Automation of the ORM measurement can be prepared in this step.</p>
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