commissioning and measurements

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Presentation transcript:

commissioning and measurements LINAC4 RFQ commissioning and measurements alessandra lombardi – 20 Nov 2013 – GSI

RFQ beam commissioning The time allocated for this talk is longer than the time it took to commission the RFQ ……. Talk outline RFQ beam commissioning Layout -1 min Source measurements-2 min Beam thru the RFQ-3min Measurements -4 min Conclusions and discussion -5 min Set solenoids to nominal value- 1min Open beam stopper and vacuum valve-30 sec Empirically optimise steerers - 2 min See beam at 3 MeV :

45 kev to 3 Mev source : 45 keV LEBT 2 solenoids, 2 steerers Beam current Beam profile Slit and grid emitt (temporary) RFQ : 3 MeV MEBT 11 quads 3 bunchers 2 choppers Beam current at 2 locations Wire scanners ion source RFQ chopper line Diagnostics line spectrometer beam dump

Movable Diagnostic bench Low energy bench (up to 12 MeV) Spectrometer (0.2 %) Slit and Grid Emittance ToF (calibration) Bunch Shape Monitor Halo Monitor (chopping eff.)

Beam at the source-45kev Measured emittance, includes H0. Measured current : 16mA for 200µsec. Comparison of measured emittance (yellow) and RFQ acceptance (pink). The expected transmission (PARMTEQ + TOUTATIS) is 75%.

10mA H- accelerated to 3 MeV First beam thru the RFQ Wednesday 13/03/13 at 16h10 10mA H- accelerated to 3 MeV

Transmission vs. RF power for different pressure in the LEBT (neutralisation)

Transverse emittance-direct Yellow = measured, pink = simulations

Long emittance -indirect BU.1 fixed BU.2 varying BU.3 OFF BSM Measurement Reconstruction RFQ

Long emittance -indirect Expected : 21 keV Reconstructed : 22 keV Reconstruction technique and diagnostic performance were validated !

JUST LUCKY OR…? The beam commissioning was very swift because of a strong collaboration between mechanics, RF and beam dynamics during the manufacturing phase AND a thorough work of simulations and measurements on the LEBT We have developed a tool to generate a particle beam distribution FROM MEASURED data. We find that the simulations with a computer generated beam with the same rms emittance doesn’t represent the measurements as well. Indirect measurements (transverse emittance via wire scanner; longitudinal via Bunch Shape Monitor) are sufficiently accurate, provided we use as input the measured beam at 45keV. SOMEWHERE A SLIT AND GRID EMITTANCE MEASUREMENT IS NEEDED! alessandra lombardi