The experiments to measure dynamic aperture and beam energy spread of the VEPP-4M collider [1] are described. The optical diagnostics of the accelerator were applied for that purpose.·¥¤¸É ¢²¥´Ò ·¥ §Ê²ÓÉ ÉÒ Ô±¸ ¶¥·¨³¥´Éμ¢ ¶μ¨ §³¥·¥´¨Õ ¤¨´ ³¨Î¥¸±μ° ¶¥·ÉÊ·Ò¨Ô´¥·£¥É¨Î¥¸-±μ£μ · §¡·μ¸ ¶Êα ´ ±μ²² °¤¥·¥ ‚-4OE.ˆ §³¥·¥´¨Ö ¶·μ¢μ¤¨²¨¸Ó ¶·¨ ¶μ³μÐ¨μ ¶É¨Î¥¸±¨Ì ¤¨ £´μ¸É¨± ʸ±μ·¨É¥²Ö.

A new fast beam profile monitor has been developed at the Budker Institute of Nuclear Physics. This monitor is based on the Hamamatsu multianode photomultiplier with 16 anode strips and provides turn-by-turn measurement of the transverse beam profile. The device is equipped with an internal memory, which has enough capacity to store 131,072 samples of the beam profile. The dynamic range of the beam profile monitor allows us to study turn-by-turn beam dynamics within the bunch charge range from 1 pC up to 10 nC. Using this instrument, we have investigated at the VEPP-4M electron-positron collider a number of beam dynamics effects which cannot be observed by other beam diagnostics tools.

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