Ma, P.F. Du, C.T. Guan, X. Guo, Q.K. Lei, Y. Tang, R. Wang, B.C. Wang, X.W. Xing, Q.Z. Zheng, S.X. JACoW Publishing Geneva, Switzerland 2226-0366 978-3-95450-194-6 10.18429/JACoW-LINAC2018-THPO036 English 763-766 THPO036 DTL rfq alignment emittance linac Contribution to a conference proceedings 2019 2019-01 https://doi.org/10.18429/JACoW-LINAC2018-THPO036 http://jacow.org/linac2018/papers/thpo036.pdf The Compact Pulsed Hadron Source (CPHS) at Tsinghua University is one multi-purpose pulsed neutron source. The injector of the CPHS is a linac, which mainly consists of a source, a low-energy beam transport line (LEBT), a radio frequency quadrupole (RFQ) and a drift tube linac (DTL). The error study of the DTL for CPHS is presented in this paper. The error study can provide the field tolerances in the DTL cavity and the alignment tolerance between the RFQ and DTL.