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VERSION:2.0
PRODID:-//Memento EPFL//
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SUMMARY:H- ion source for CERN’s Linac4 accelerator: simulation\, experi
 mental validation and optimization of the  hydrogen plasma
DTSTART:20170727T103000
DTEND:20170727T113000
DTSTAMP:20260410T135100Z
UID:6d37877ff3f494a03d53a154fc7986d56b3ec19a35edc0f2f583ee9e
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. S. Mattei\, CERN-Geneva & SPC-EPFL\nLinac4 is the new nega
 tive hydrogen ion (H-) linear accelerator of the EuropeanOrganization for 
 Nuclear Research (CERN). Its ion source operates on the principle of Radio
 -Frequency Inductively Coupled Plasma (RF-ICP) and it is required to provi
 de 50 mA of H- beam in pulses of 600 μs with a repetition rate up to 2 Hz
  with ratio of e-/H-<8. We have developed a Particle-In-Cell Monte Carlo C
 ollision (PIC-MCC) code to simulate the RF-ICP heating mechanism and perfo
 rmed optical emission spectroscopy measurements to validate the simulation
 s. The code self-consistently solves the interaction between the RF fields
  and the plasma response. We present an analysis of the capacitive to indu
 ctive transition characteristic of the initial phase of the discharge as w
 ell as a parametric study of the RF current\, hydrogen pressure and magnet
 ic configuration (cusp and filter fields) in the high density regime (1019
  m-3)\, representative of the nominal operation of the Linac4 ion source d
 uring beam extraction. The simulation results\, confirmed by experimental 
 data\, provide guidelines for the optimization of the ion source operation
 al and design parameters.\n 
LOCATION:PPB019
STATUS:CONFIRMED
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