Plasma characterization of the superconducting proton linear accelerator plasma generator using a 2 MHz compensated Langmuir probe

Journal Article · Wed Feb 15 00:00:00 EST 2012 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3672109· OSTI ID:22063876

Schmitzer, C ^[1]; CERN, 1211 Geneva 23 ^[2]; Kronberger, M; Lettry, J; Sanchez-Arias, J ^[3]; Stoeri, H ^[1]

---

1. Vienna University of Technology, Institute of Applied Physics, Wiedner Hauptstrasse 8-10, 1040 Vienna (Austria)
2. Switzerland
3. CERN, 1211 Geneva 23 (Switzerland)

The CERN study for a superconducting proton Linac (SPL) investigates the design of a pulsed 5 GeV Linac operating at 50 Hz. As a first step towards a future SPL H{sup -} volume ion source, a plasma generator capable of operating at Linac4 or nominal SPL settings has been developed and operated at a dedicated test stand. The hydrogen plasma is heated by an inductively coupled RF discharge e{sup -} and ions are confined by a magnetic multipole cusp field similar to the currently commissioned Linac4 H{sup -} ion source. Time-resolved measurements of the plasma potential, temperature, and electron energy distribution function obtained by means of a RF compensated Langmuir probe along the axis of the plasma generator are presented. The influence of the main tuning parameters, such as RF power and frequency and the timing scheme is discussed with the aim to correlate them to optimum H{sup -} ion beam parameters measured on an ion source test stand. The effects of hydrogen injection settings which allow operation at 50 Hz repetition rate are discussed.

• OSTI ID: 22063876
• Journal Information: Review of Scientific Instruments, Vol. 83, Issue 2; Conference: ICIS 2011: 14. international conference on ion sources, Giardini-Naxos, Sicily (Italy), 12-16 Sep 2011; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM INJECTION
CERN
CUSPED GEOMETRIES
DISTRIBUTION FUNCTIONS
ELECTRON TEMPERATURE
ELECTRONS
ENERGY SPECTRA
GEV RANGE
HYDROGEN IONS 1 MINUS
ION BEAMS
ION SOURCES
ION TEMPERATURE
LANGMUIR PROBE
LINEAR ACCELERATORS
MHZ RANGE
PLASMA GUNS
PLASMA POTENTIAL
PROTONS
TIME RESOLUTION