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A beam line is built after the IHEP RFQ for halo study. To determinetransverse emittance and ellipse parameters of the RFQ output beam, beam sizedata obtained from the first two of 14 wire scanners are employed. By using thetransfer matrix method and the least square method, a set of linear equationswere set up and solved. The solutions were then applied as initial beamparameters in multi-particle simulations to check the method of calculation. Itis shown that difference between the simulated RMS beam size and the measuredone at the measurement location is less than 7%, which is acceptable in ourexperiments.

Determining phase-space properties of the IHEP RFQ output beam using the RMS beam widths from wire-scanners