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Warm Coupler Conditioning Completed - ESS Accelerator Prepares for Cold Operation | ESS
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</div> <main class="site-content" role="main"> <a id="main-content" tabindex="-1"></a> <div id="block-content"> <div class="article"> <div class="article__main"> <div class="row"> <header class="article__main-header col-12 col-md-8 col-xl-9"> <h1 class="article__title">Warm Coupler Conditioning Completed - ESS Accelerator Prepares for Cold Operation</h1> <div class="article__created-date"> <time datetime="2024-11-04T15:18:08+01:00" class="date date--primary"><time datetime="2024-11-04T15:18:08+01:00" title="Monday, November 4, 2024 - 15:18">November 4, 2024</time> </time> </div> </header> </div> <div class="row"> <div class="article__main-content col-12 col-md-8 col-xl-9"> <div class="article__image"> <div class="media media-image media-image--article-lead"> <div class="media__content"> <picture> <source srcset="/sites/default/files/styles/article_image/public/images/media/2024-11/WCC%20completion.png?itok=bZLyQXM6 1x" media="(min-width: 576px)" type="image/png" width="1281" height="404"/> <img class="image" loading="eager" class="image" src="/sites/default/files/styles/article_image/public/images/media/2024-11/WCC%20completion.png?itok=bZLyQXM6" width="1281" height="404" alt="WCC team" /> </picture> </div> <footer class="media__footer"> <div class="caption"> A significant team effort: Celebrations in the ESS Main Control Room after the completion of the warm coupler conditioning of the 27 cryomodules needed for Accelerator Commissioning. </div> </footer> </div> </div> <div class="article__sections"> <section class="layout-section layout-section--primary layout-section--one-columns"> <div class="layout-section__row"> <section class="section section--text"> <h3>With the completion of聽the warm conditioning of all 82 couplers in the聽spoke,聽medium beta and high beta sections, all 27聽cryomodules in the聽superconducting linac (SCL) section of the ESS聽accelerator聽have been declared ready for cooldown.聽</h3> </section> </div> </section> <section class="layout-section layout-section--primary layout-section--one-columns"> <div class="layout-section__row"> <section class="section section--text"> <p><a href="/article/2024/07/03/warm-coupler-conditioning-starts-ess-superconducting-linac" data-entity-type="node" data-entity-uuid="163c9718-d0b1-4027-93f5-81617bc8b513" data-entity-substitution="canonical">The warm coupler conditioning started in June this year</a>, with the first coupler in the spoke section receiving the first radio-frequency (RF) pulse. Thanks to聽extensive collaboration between multiple teams and partner institutions, this crucial phase was successfully completed on October 18, setting the stage for the start of cold operation of the linac.</p><p>Coupler conditioning is a critical step in the integration of multiple, independently tested systems. It involves synchronising cryomodules, RF systems, power converters, vacuum systems, cooling infrastructure, and control software, ensuring they operate in harmony with local protection systems to safeguard the correct configuration of the accelerator's components. This phase not only verifies the hardware's performance but also provides a valuable opportunity for procedural testing and cross-team training, essential in preparation for beam commissioning in 2025.</p> <div data-entity-type="media" data-entity-uuid="d077de20-0c67-40fd-86d1-04a9ac85e9eb" data-embed-button="media" data-entity-embed-display="view_mode:media.custom" data-langcode="en" data-entity-embed-display-settings="[]" class="embedded-entity embedded-media embedded-media-image embedded-media-image--custom"> <div class="media media-image media-image--custom"> <div class="media__content"> <img class="image" src="/sites/default/files/styles/custom/public/images/media/2024-11/G01%20SCL-2.jpeg?itok=HHbn4kpN" width="5240" height="4024" alt="ESS SCL" loading="lazy" /></div> <footer class="media__footer"><div class="caption"><p>Cryomodules in the ESS Superconducting Linac.</p> </div> </footer></div> </div> <p>In the coming weeks, efforts will shift towards preparing the machine for cooldown. This will involve completing the commissioning of the backup compressor, conducting final leak checks on all cryogenic lines, verifying control systems, and completing pre-start reviews. The cold conditioning process will begin once all 27 cryomodules reach a stable temperature of 2K in the tunnel, marking the final step before the cavities can be declared ready for beam operations.</p><p>This milestone represents a substantial collaborative achievement, with contributions from various teams across ESS and its partner institutions. The elliptical cryomodules (medium and high beta) were assembled at CEA (France), and the spoke cryomodules at IJCLab (France), with cavities provided by INFN (Italy), STFC (UK), and IJCLab. The spoke cryomodules underwent testing at the FREIA lab at Uppsala University (Sweden), and the elliptical cryomodules were tested at聽an on-site聽test stand, in close collaboration with IFJPan (Poland). The conditioning process was led by the Linac Group in the Accelerator Division, with significant support from the RF, Power Converters, and Vacuum Groups, as well as Controls in ICS, Radiation Protection (RP), and the Main Control Room (MCR) in Operations.</p><p>This achievement is a significant step toward ESS assuming full ownership of these critical accelerator components for reliable facility operations.</p> </section> </div> </section> <section class="layout-section layout-section--primary layout-section--two-columns"> <div class="layout-section__row"> <section class="section section--text"> <div data-entity-type="media" data-entity-uuid="9228874d-0bf1-4a6f-a030-b17025ec0bcd" data-embed-button="media" data-entity-embed-display="view_mode:media.custom" data-langcode="en" data-entity-embed-display-settings="[]" class="embedded-entity embedded-media embedded-media-image embedded-media-image--custom"> <div class="media media-image media-image--custom"> <div class="media__content"> <img class="image" src="/sites/default/files/styles/custom/public/images/media/2024-11/wcc%20graph-1.jpeg?itok=wupkSN9V" width="768" height="1024" alt="WCC pic-1" loading="lazy" /></div> <footer class="media__footer"><div class="caption"><p><strong>Conditioning in action! </strong>Scope traces of forward power to the cavity (yellow), the arc light (red) and electron pickup signals (purple) in the coupler vacuum envelope, indicating formation of a low density plasma performing the surface cleaning process. Interlock levels are set to avoid abrupt discharges during the process and gently prepare the coupler surfaces to handle the full nominal power needed for operation.</p> </div> </footer></div> </div> </section> <section class="section section--text"> <div data-entity-type="media" data-entity-uuid="4c1f87dc-f549-46b1-ab30-1cf159d0eaf1" data-embed-button="media" data-entity-embed-display="view_mode:media.custom" data-langcode="en" data-entity-embed-display-settings="[]" class="embedded-entity embedded-media embedded-media-image embedded-media-image--custom"> <div class="media media-image media-image--custom"> <div class="media__content"> <img class="image" src="/sites/default/files/styles/custom/public/images/media/2024-11/wcc%20graph-2.png?itok=MeKM2arI" width="890" height="582" alt="WCC pic-2" loading="lazy" /></div> <footer class="media__footer"><div class="caption"><p>The conditioning application, fully developed at ESS by the SRF team with strong support from the Integrated Control System (ICS) division. It allows the running of the process聽in a controlled way according to a predefined sequence which increases the RF pulse energy up to full nominal conditions for operation. The same tool will be used for the starting phase of the cold conditioning operation, where the sequences will be performed once more to properly achieve coupler surface conditioning before tuning the cavities and starting the cavity conditioning process itself.</p> </div> </footer></div> </div> </section> </div> </section> <section class="layout-section layout-section--primary layout-section--one-columns"> <div class="layout-section__row"> <section class="section section--text"> <hr /><p><em>This spotlight article is part of the series聽<strong>"Road to Beam on Dump"</strong>聽where we highlight all the systems required to commission the ESS accelerator.</em></p><p><em>Previous updates:</em></p><ul><li><a href="https://confluence.ess.eu/pages/viewpage.action?pageId=542191075">ESS Linac Under Vacuum</a></li><li><a href="https://confluence.ess.eu/pages/viewpage.action?pageId=542185064">The Power to Accelerate: RF Power Stations up and running</a></li><li><a href="https://confluence.ess.eu/pages/viewpage.action?pageId=541098339">Installation and Testing of the 2 MW RF Scope Completed</a></li><li><a href="https://confluence.ess.eu/pages/viewpage.action?pageId=524659989">Focus on Beam Instrumentation: Completion of Beam Current Monitors Installation in the ESS Accelerator</a></li><li><a href="https://confluence.ess.eu/pages/viewpage.action?pageId=523829970">First Insertable Beam Stop installed in the ESS superconducting linac</a></li><li><a href="https://confluence.ess.eu/pages/viewpage.action?pageId=516021504">Magnets Ready to Focus and Steer the Proton Beam</a></li><li><a href="https://confluence.ess.eu/pages/viewpage.action?pageId=516008011">Warm Coupler Conditioning starts in the ESS Superconducting Linac</a></li></ul> </section> </div> </section> </div> </div> <aside class="article__sidebar col-4 col-xl-3"> <div class="read-next-block"><div class="read-next-block__inner"> <h4 class="read-next-block__title">Top stories</h4> <div><div 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