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TIARA WP8 Status

TIARA WP8 Status. M. Biagini , INFN-LNF, for WP8 TIARA Mid-Term Meeting Madrid, June 13 th 2012. WP8 – HGA WP coordinator: M. Biagini (INFN). WP deputy : A. Gallo (INFN).

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TIARA WP8 Status

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  1. TIARA WP8 Status M. Biagini, INFN-LNF, for WP8 TIARA Mid-Term Meeting Madrid, June 13th 2012

  2. WP8 – HGAWP coordinator: M. Biagini (INFN). WP deputy: A. Gallo (INFN) • Goal: energy upgrade of the Frascati SPARC test-facility linac by designing, constructing and commissioning 2 C-band (f=5712 MHz) TW high-gradient accelerating structures • Partners: INFN, PSI, University of Rome “La Sapienza” as sub-contractor • Duration: 3 years • Work Breakdown: • WP8.1 : Study of SPARC upgrade in Energy (INFN) • WP8.2 : RF Low level Electronics for SPARC (PSI) • WP8.3 : Construction and test of 2 C-band sections (INFN)

  3. SPARC: Photoinjector with lowemittance RF gun, 3 S-band sections for 170 MeVelectrons, undulators for FEL studies SPARC @ LNF

  4. SPARC upgrade (hybrid S-C band) TIARA

  5. Task 8.1, 8.3 – C-band sectionsat LNF: status of design and fabrication The cells of the first acceleratingstructureprototypehavebeenfabricated 2) The input/output couplers of the first acceleratingstructureprototypehavebeenfabricated and the brazing of the input and output couplers with vacuumstainlesssteelflangeshasbeendone

  6. 3) Preliminary RF measurements of pre-assembledstructures (fewcells + input and output couplers) havebeendone (see Fig. A). Theyare used to characterize the cells and monitor the quality of the input and output couplerrealization. An example of measuredacceleratingfield in magnitude and phaseisgiven in Fig. B 4) The cells of the secondacceleratingstructure are still under fabrication 5) The input/output couplers of the secondacceleratingstructure are still under fabrication Fig. B Fig. A

  7. Task 8.3 – C-band sectionsfabrication Cell in the oven for brazing Vacuum leak test after brazing sensibility 10-10

  8. Insert rings for brazing Insert cells into the vacuum oven Stack completed Coupling cells in a stack for brazing

  9. Task: design a flexible and high performance Low Level RF system for 5712 MHz (C-band) The control of high gradient C-band accelerating structures willbeachieved by a digital lowlevel RF (LLRF) system where all RF signals are down-converted to intermediatefrequencieswhich are thendigitized and processed on powerful digital processingplatforms. The drive signal isfinally up-converted to control the RF high power chain This system isstudied and realizedat PSI and willbetestedat SPARC scope of the WP 8.2 T. Schilcher Task 8.2 - RF Low Level Electronics for SPARC System layout

  10. Thistopicwill be discussedby Manuel Broennimann (PSI)in the secondhalf of my time slot

  11. Task 8.2 - LLRF at PSI  Milestonedelayed • Request from PSI to moveMilestone 32 (RF-LLE-P) from Dec. 2012 to June 2013 (seeletter from PSI Task leader T. Schilcher) • Due to the tight specifications of the system the design work tooklongerthanpredicted, and an RF engineer who should have supported the senior RF engineer in the design has left PSI. As a consequence, a replacement needs to be hired and requires about 6 months to resume the work • In the meanwhile, the design tasks of the RF front-end modules can only be processed sequentially instead of parallel as originally foreseen • PSI is confident to deliver a C-band LLRF system which meets the specifications by the latest June 2013 • This delay (ifkept to 6 months) meansthat the LLRF systemwillnot be testedbeforeitsinstallation on SPARC. Thismaynotrepresent a realproblem, but the delay shouldnotexceed the 6 months • Discussion on thistopicwill be carried out during the WP8 parallel session today

  12. Milestones and time schedule

  13. Conclusions • Tasks 8.1 and 8.3 are proceeding on schedule, procurementof hardware accomplished, design of cavitiesaccomplished, assembling and brazing of cellsin progress • Task 8.2, design of LLRF systemdone • Milestone 32 (LLRF prototype ready, PSI): a 6 month delay willallow for delivering the LLRF prototype with allspecificationsmet

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