Monte Carlo simulation of transmission of relativistic H{sup {minus}} beams through thin carbon foils

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:199617

Gervais, B ^[1]

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1. CIRIL Laboratoire, Caen (France)

The conversion of relativistic H{sup {minus}} to H{sup +} beams by stripping in a thin carbon foil plays an important role in the injection of high-energy proton accelerators and storage rings. The residual portion of neutral hydrogen in excited states determines the beam loss and the level of radiation near the first turn of the ring. The understanding of the stripping is therefore of crucial importance for the optimisation of the injection. The authors have performed a classical Monte Carlo simulation of the transport of H{sup {minus}} and of excited H(n) states through carbon foils at relativistic energies. The transport of bound and free electrons in a presence of the Coulomb field of the nucleus as well as the multiple scattering of the solid is taken into account. The authors analyze the relativistic modifications of the collision kernel and find that transverse excitations are not yet important at moderate {gamma} ({gamma} {le} 2). The distribution of excited states of H and of survival H{sup {minus}} are presented as a function of the thickness of the foil and compared to experimental data from LAMPF.

• OSTI ID: 199617
• Report Number(s): CONF-941129--
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BEAM STRIPPERS
CARBON
ELECTRON LOSS
HYDROGEN 1 MINUS BEAMS
MONTE CARLO METHOD
RELATIVISTIC RANGE