CERN’s Linac4 cesiated surface H− source

Linac4 cesiated surface H− sources are routinely operated for the commissioning of the CERN’s Linac4 and on an ion source test stand. Stable current of 40-50 mA are achieved but the transmission through the LEBT of 80% was below expectations and triggered additional beam simulation and characterization. The H− beam profile is not Gaussian and emittance measurements are larger than simulation. The status of ongoing development work is described; 36 mA H− and 20 mA D− beams were produced with a 5.5 mm aperture cesiated surface ion source. The emittances measured at the test stand are presented. During a preliminary test, the Linac4 proton source delivered a total beam intensity of 70 mA (p, H2+, H3+).

[1]  Enrico Bravin,et al.  Design of a new Emittance Meter for LINAC4 , 2009 .

[2]  F. Roncarolo,et al.  Commissioning of the LINAC4 Ion Source Transverse Emittance Meter , 2010 .

[3]  T. Ropponen,et al.  IBSIMU: a three-dimensional simulation software for charged particle optics. , 2010, The Review of scientific instruments.

[4]  S. Okuda,et al.  Meniscus and beam halo formation in a tandem-type negative ion source with surface production , 2012 .

[5]  J. Borburgh,et al.  NEW PSB H − INJECTION AND 2 GeV TRANSFER TO THE CERN PS , 2015 .

[6]  Richard Scrivens,et al.  Optimization of the beam extraction systems for the Linac4 H− ion source , 2015 .

[7]  Akiyoshi Hatayama,et al.  Kinetic simulations and photometry measurements of the E-H transition in cylindrical inductively coupled plasmas , 2016 .

[8]  U. Fantz,et al.  Determination of the cusp field on the plasma parameters of the Linac4 H– ion source , 2016 .

[9]  U. Fantz,et al.  Influence of the cusp field on the plasma parameters of the Linac4 H ion source , 2016 .

[10]  Alessandra Lombardi.  The LINAC4 Project , 2016 .

[11]  S. Mochalskyy,et al.  Beam formation in CERNs cesiated surfaces and volume H− ion sources , 2016 .

[12]  M Paoluzzi,et al.  Linac4 H⁻ ion sources. , 2016, The Review of scientific instruments.

[13]  Akiyoshi Hatayama,et al.  Investigation of the RF efficiency of inductively coupled hydrogen plasmas at 1 MHz , 2017 .

[14]  U. Fantz,et al.  submitter : Influence of the cusp field on the plasma parameters of the Linac4 H− ion source , 2017 .

[15]  Akiyoshi Hatayama,et al.  Effects of the extraction voltage applied by the puller-electrode on the H− extraction in the Linac4 negative ion source , 2017 .

[16]  Akiyoshi Hatayama,et al.  Numerical Simulation of the RF Plasma Discharge in the Linac4 H- Ion Source , 2017 .