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COMMISSIONING of the ALBA LINAC M.Pont XVI ESLS 27-28 November 2008

COMMISSIONING of the ALBA LINAC M.Pont XVI ESLS 27-28 November 2008. SCHEDULE. 10/2005 Contract signed with THALES Communications (turn-key system) 09/2006 Design report approved 10/2007 Linac ready at THALES ….. CELLS building not ready for installation

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COMMISSIONING of the ALBA LINAC M.Pont XVI ESLS 27-28 November 2008

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  1. COMMISSIONING of the ALBA LINAC M.Pont XVI ESLS 27-28 November 2008

  2. SCHEDULE 10/2005 Contract signed with THALES Communications (turn-key system) 09/2006 Design report approved 10/2007 Linac ready at THALES ….. CELLS building not ready for installation 02/2008 Linac installation at CELLS …. Additional waiting for conventional facilities 05/2008 Start conditioning 07/2008 First beam 10/2008 Site Acceptance Tests

  3. Linac specifications

  4. Main components: • Electron Gun : Thermionic (Pierce type), 90 kV DC gun with grid modulator at 500 MHz • Bunching Section: Pre-buncher: single cell @ 500MHz • Pre-buncher: single cell @ 3 GHz • Buncher: 1 SW bunching section @ 3GHz • Energy at the bunching section output = 16 MeV • 2 Acc. sections: TW 2/3πConstant Gradient3 GHz. • Energy gain= 55 MeV @ 20MW nominal input power. • 2 Klystron modulators: 35 MW each klystron at 3GHz. • The first one feeds the 3 GHz bunching section and the 1st acc. structure. • The second one feeds the second accelerating structure E-gun electronics Buncher Accelerating structure klystron

  5. LINAC installation done by THALES

  6. E-gun 500 MHz pre-buncher Service Area 1st accelerating structure Cooling loop

  7. LT installation done by CELLS FCUP (Beam Dump) to Booster SCR FSOTR2 BCM2 FCT-LiDia Diagn. Line (LiDia) FSOTR1 BPM2 AE Vac. Valve (Linac End)

  8. Conditioning started May 08 After 3 weeks of conditioning P = 32.5 kV POUT = 29.10 MW V = 244 kV PAS1 = 17.60 MW I = 249 A Pbuncher = 5.20 MW • Requeriments for a 100 MeV beam • PAS1 = 15 MW • Pbuncher = 5 MW • PAS2 = 10 MW  AS1 AS2 POUT = 18.0 MW PAS2 = 16.7 MW • Break down, no recovery • At last window broke • Fast replacement thanks to SOLEIL Buncher focusing ON 1 Hz 3 Hz

  9. FIRST BEAM IN THE LINAC 02.07.08 Q=0.2 nC Pulse length 240 ns

  10. FCT4 AE Li-BPM LT-BPM FIRST BEAM IN THE LT 03.07.08 FCT1 FCT2 FCT3

  11. PULSES: Time characterisation SBM, 2 nC in 8 pulses (zoom on 1st pulse) 4 % amplitude reduction 420ps specs <1ns Jitter: 28 ps (rms) Specs < 100 ps (rms)

  12. Energy and energy spread Bending Linac SCRH BCM2 BCM1 • Energy scan through bending magnet or scraper offset • Log BCM ratios (before and after bending) Plotting BCM ratio vs energy provides E0 and DE/E0: E MBM DE/E0 = 0.2 % SBM DE/E0 = 0.3 % FWHM

  13. Beam optimisation at 108 MeV, MBM Beam loading compensation to reduce the energy spread The beam is injected during the filling time of the 2nd structure Measured energy spread is 1.55 MeV FWHM (no beam loading comp.) After using beam loading compensation New energy spread is 0.5 MeV FWHM Beam loading compensation allows for a reduction of the energy spread by a factor 3

  14. Emittance measurements FS/OTR Q triplet Linac • Scan one Q (usually Q1) around a beam waist at FS/OTR • Record beam size vs Q strength • YAG FS vs OTR • Online & offline analysis Typical fitted beam profile

  15. Emittance measurements MBM, 112 ns, 3.8 nC, 106.5 MeV OTR screen

  16. RESULTS OF SAT * Beam dynamics optimised ** Limited by instrumentation noise *** Operation at 5 Hz is not required (Booster runs at 3 Hz max)

  17. CONCLUSIONS • The tests on the Linac have been very succesful • Specifications achieved in the different operation modes: SBM and MBM in terms of charge, energy spread and emittance • Final Acceptance to be signed before end of the year (waiting for the final documentation) • After restarting the Linac in spring 2009 more measurements are needed in order to fully characterize the beam (improve transmission, look for max E achievable, re-measure emittance …)

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