Raparia, D. Atoian, G. Lehn, T. LoDestro, V. Mapes, M. McNerney, A. Ritter, J. Zelenski, A. JACoW Publishing Geneva, Switzerland 2226-0366 978-3-95450-194-6 10.18429/JACoW-LINAC2018-MOPO100 English 214-216 MOPO100 proton linac rfq ion-source dipole Contribution to a conference proceedings 2019 2019-01 https://doi.org/10.18429/JACoW-LINAC2018-MOPO100 http://jacow.org/linac2018/papers/mopo100.pdf Doubly stripped H⁻ in the low energy beam transport are capture 180 degree apart in the RF of RFQ and accelerated to the full energies. These protons are bend in the opposite direction of H⁻ after the 200 MeV drift tube linac and caused vacuum leak. A new beam dump for these stripped protons is planned