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Advanced Development of CCDTL Accelerating Section of Linac4 Project

Within projects #3888 and #3889p, this initiative aims to enhance and test the CCDTL accelerating section of Linac4. The collaborative effort involves design, manufacturing, and testing of 21 accelerating cavities in 7 modules with a total length of ~25m. The focus is on improving production processes, such as brazing drift tubes, adaptable tube connections, and alignment methods, along with R&D advancements like vacuum pumping and cooling optimizations. The project's execution involves various phases at VNIITF, BINP, and CERN, ensuring comprehensive development and meticulous testing. The current status highlights progress in drift tube mock-ups, auxiliary tools, and assembly preparations at BINP, and technological enhancements and manufacturing progress at VNIITF.

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Advanced Development of CCDTL Accelerating Section of Linac4 Project

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  1. Complementary ISTC Projects #3888, 3889p for the construction of CCDTL accelerating section of Linac4 Within these 2 projects it is foreseen to develop, manufacture and test CCDTL accelerating section of Linac4 (21 accelerating cavities in 7 modules, ~25m). ►►► The developments and results of the project 2875 will be fully exploited ◄◄◄ Distribution of works will be similar: 1 The design of Linac4 CCDTL accelerating section will be developed jointly by all the participating parties. Tanks and support frames will be built at VNIITF. After copper plating and a test assembly the modules will be shipped to BINP. 2 BINP will build and install the drift tubes and take care of the rf tuning and final assembly. 3 Rf conditioning and high power tests of all the 7 modules will be done at CERN. Slide from kick-off meeting on the ISTC Linac4 Projects held at CERN on October 29, 2009

  2. Complementary ISTC Projects #3888, 3889p for the construction of CCDTL accelerating section of Linac4 Although the CCDTL prototype built within the ISTC Project 2875 performed good, certain design and production technology improvements will be implemented to the CCDTL modules to be built. • Drift tube will be brazed rather than EB-welded. • Drift tube to tank connection will be dismountable rather than permanently welded. • Alignment concept and procedure will be different. + modifications in the vacuum pumping scheme, optimization of the water cooling scheme This calls for more R&D activities, which are in progress now. We still believe we can follow the schedule in general 304L OFHC Cu Auxiliaries Tanks VNIITF  BINP M 1 M 7 M 2,3 M 4,5,6 M 6,7 Modules BINP CERN M 4,5 M 1 M 2,3 Slide from kick-off meeting on the ISTC Linac4 Projects held at CERN on October 29, 2009

  3. Complementary ISTC Projects #3888, 3889p for the construction of CCDTL accelerating section of Linac4 Current status • BINP • Drift tube mock-ups and a test vacuum vessel with drift tube girder are being made and should be finished in Dec. 2009 • Auxiliary tools. • Assembly table is being made and should be finished in Dec. 2009 • Drift tube alignment tools are being made and should be finished in Dec. 2009 • Aluminum dummy drift tubes for measuring resonant frequencies of the cavities upon their arrival from VNIITF should be finished in Dec. 2009 • Test and measurement area should be finished in Dec. 2009 • As soon as the materials for drift tubes and tuners are delivered to BINP, manufacturing will start. Final machining will be done after rf measurements of actual tanks received from VNIITF. • VNIITF • Galvanic shop upgrade (aimed at handling large half-tanks of high energy modules) is in progress • Technological tools have been designed, procurement of the materials for the tools and procurement of standard tools are in progress. • Execution drawings of the tanks and coupling cells are prepared and will be transferred to the Workshop as soon as all the design modifications are finalized. • Manufacturing will start as soon as the materials for tanks and coupling cells are delivered to VNIITF. Slide from kick-off meeting on the ISTC Linac4 Projects held at CERN on October 29, 2009

  4. Complementary ISTC Projects #3888, 3889p for the construction of CCDTL accelerating section of Linac4 Current status • BINP • Drift tube mock-ups and a test vacuum vessel with drift tube girder are being made and should be finished in Dec. 2009 – completed in February 2010 • Auxiliary tools. – completed by December 2009 • Assembly table is being made and should be finished in Dec. 2009 • Drift tube alignment tools are being made and should be finished in Dec. 2009 • Aluminum dummy drift tubes for measuring resonant frequencies of the cavities upon their arrival from VNIITF should be finished in Dec. 2009 • Test and measurement area should be finished in Dec. 2009 – completed in March 2010 • As soon as the materials for drift tubes and tuners are delivered to BINP, manufacturing will start. – materials arrived in January 2010, during this meeting we expect to agree on the DT design and production technology. Final machining will be done after rf measurements of actual tanks received from VNIITF. • VNIITF • Galvanic shop upgrade (aimed at handling large half-tanks of high energy modules) is in progress • Technological tools have been designed, procurement of the materials for the tools and procurement of standard tools are in progress. • Execution drawings of the tanks and coupling cells are prepared and will be transferred to the Workshop as soon as all the design modifications are finalized. • Manufacturing will start as soon as the materials for tanks and coupling cells are delivered to VNIITF.

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