Kawakubo, T. Adachi, T. Ajima, Y. Ishida, T. Kadokura, E. JACoW Publishing Geneva, Switzerland 2226-0358 978-3-95450-254-7 10.18429/JACoW-ICALEPCS1991-S11LLC08 English 399-402 synchrotron acceleration electron vacuum injection Contribution to a conference proceedings 1992 1992-12 https://doi.org/10.18429/JACoW-ICALEPCS1991-S11LLC08 https://jacow.org/icalepcs1991/papers/s11llc08.pdf A mountain view of beam profiles in a synchrotron ring can be taken without any beam destruction by collecting charged particles produced by the circulating beam hitting residual gas in the ring to a sensor. When a rectangular Micro Channel Plate with multi-anodes or lined-up electron multipliers is used as the sensor, the profiles can be measured within one acceleration period, even if the beam intensity is very low and the ring is kept in a high vacuum. We describe this non-destructive profile monitor (NDPM) as well as the momentum spread measurement system by a combination of two sets of NDPM.