Measurement of the Electron Loss Cross Sections for Negative Hydrogen Ions on Carbon at 200 MeV

Abstract

The beam diagnostic equipment in the injection area of the Fermi lab Booster accelerator has been used to measure the cross sections of electron loss for Hiens on carbon. The details of the method are described. Preliminary results and comparison to theoretical calculations are presented.

Stripping efficiency and lifetime of carbon foils

“…Several cross section measurements of H -ion incident on carbon foil at different energies have been reported [6][7][8][9][10][11]. For example, Figure 5 shows the data at 200 MeV measured by Webber and Hojvat [8] and Figure 6 the data measured by Gulley et al at 800 MeV [7].…”

“…For example, Figure 5 shows the data at 200 MeV measured by Webber and Hojvat [8] and Figure 6 the data measured by Gulley et al at 800 MeV [7].…”

Effects of injection beam parameters and foil scattering for CSNS/RCS

“…In addition, x = N • τ /A, where N • is the Avogadro's constant, A is the atomic number of the carbon foil, and τ is the area density. The percent of the H − beam traverses the carbon foil without stripping is given by [14] …”

160 MeV H^- injection into the CERN PSB

“…The estimated beam loss due to inelastic nuclear scattering is ~3 × 10 -4 and the normalised emittance increase due to multipleCoulomb scattering is 0.34 and 0.18 π.mm·mrad for the CNGS and LHC beams, respectively. The foil should strip ~99 % of the H -to H + , leaving about 1% of H 0 and less than 0.1 % of H - [5]. For operational efficiency, it must be possible to exchange foils remotely.…”