A comparative study of profile and scraping methods for emittance measurements in the PS Booster

It is important to have a clear understanding of the transverse emittance i n a circular accelerator in order to achieve optimum brilliance. Experience with comparing emittance data From different instruments has shown that sy stematic errors can be important. In an attempt to detect such errors in th e PS Booster, the emittance measurements are made according to two differen t principles: measurement of density distribution and measurement of amplit ude distribution. In this paper we (i) discuss these two principles and the theory behind them; (ii) show how the data can be compared; (iii) describe the instrumentation used For these measurements; and (iv) present results for typical PS Booster beams.