CCDTL 8th technical meeting for production of 7 CCDTL modules for Linac4 (ISTC contract #3888 and #3889), 3-4 December 2012 at BINP

Participants:

BINP Novosibirsk: Alexey. Tribendis (project manager of the ISTC Projects 3888/89), Ermek. Kenzhebulatov (RF scientist), Yuri Biryuchevskiy (design engineer)

ISTC: Yuri Malakhov (ISTC principal senior project manager)

CERN Geneva: Frank Gerigk (ISTC Projects 3888/89 coordinator at CERN), Maurizio Vretenar (Linac4 project leader)

CCDTL modules 2, 3 tests at CERN:

  • Module 3 was prepared for the high power tests during the visit to CERN of BINP team in October 2012. Since that time the bead pull measurements were performed at CERN resulting in the average E-field / tank within 3% for all 3 tanks which is considered as a good field distribution. The module was connected to the rf power source (klystron) and its conditioning was started. For the moment of the meeting the power delivered to the module already exceeded the nominal value although in short pulses (100 microseconds) so far. The conditioning is in progress.
  • Module 2 failed to get leak tight during the visit to CERN of BINP team. The problem was with a particular joint of the coupling cell between tanks 1 and 2. Since that time the problem was investigated at CERN on dummy pieces with the following results: a) after lathe treatment of the flange surfaces to Ra of 2.5 microns (as recommended by the gasket’s supplier) the joint immediately gets leak tight b) after hand treatment of the flange surfaces with special tool with 4 strips of diamond grinders to Ra of 2.5 microns the joint is leak tight both under compressed (-0.1mm) and at nominal compression of a used gasket. The next step will be to use the modified tool on module 2. So far there is a concern that the technique that worked on dummy pieces where the assembly was done in horizontal position of the gasket might encounter certain problems on the CCDTL module where the assembly has to be done in vertical position of the gasket.

CCDTL modules 1, 4-7 production status at BINP:

  • Module 4 – already packed and ready to be shipped to CERN.
  • Module 5 – the drift tubes and tuners are completed and installed, final rf measurements were made during the meeting, the module packing will start on December 10, 2012.
  • Module 6 – the drift tubes are ready, module assembly and rf measurements will start immediately after the module #5 is removed from the assembly table for packing. All the works with the module should be completed in December 2012.
  • Module 1– final machining of the drift tubes are being done at BINP Workshop, the stems are ready. The drift tubes of the module #1 should be completed (machined and welded) in December, module assembly and rf measurements should be finished in January 2013.
  • Module 7 – final machining of the drift tubes are being done at BINP Workshop, the stems are ready. The drift tubes of the module #7 should be completed (machined and welded) in January 2013, module assembly and rf measurements should be finished in March 2013.

CCDTL modules 1, 4-7 shipment schedule:

  • Modules 4 and 5 should be shipped to CERN in December 2012.
  • Modules 1, 6 and 7 should be shipped to CERN in March 2013.

Schedule of the visits to CERN for the completion of the projects tasks:

  • Beginning of February 2013, 6 weeks, a team of 4-5 BINP experts for assembling and testing the CCDTL modules 4 and 5.
  • Mid-April 2013, 6 weeks, a team of 4-5 BINP experts for assembling and testing the CCDTL modules 1, 6 and 7.
  • End of May, 3-4 days, representatives of BINP, VNIITF and ISTC for a final meeting on the Projects 3888 and 3889.

Availability of the funds remaining in the Projects budgets after formal end of the Projects:

  • The following question was risen during the meeting – both 3888 and 3889 projects should result in successful commissioning of the CCDTL modules at CERN. An additional sum of US$66,318.11 was transferred from the project 2889 to the project 3889p mainly to support the visits of the project participants to CERN for assembling and testing the CCDTL modules. The projects 3888 and 3889 are complementary. The modules are completed within the project 3888. The project 3889 ends 3 months before the end of the project 3889. So it is important to make the funds of the project 3889 available for travels to CERN after formal end of the Project. At the moment the understanding is that it is possible (following certain procedure but without an extension of the Project 3889).
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Topic revision: r1 - 2012-12-10 - FrankGerigk
 
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