Seeman, J.T. Beam Instrumentation Needs for a Future Electron-Positron Collider Based on PEP-II Observations JACoW Geneva, Switzerland 978-3-95450-187-8 10.18429/JACoW-eeFACT2016-WET1H1 English 157-163 WET1H1 ion luminosity vacuum feedback instrumentation Contribution to a conference proceedings 2017 2017-07 https://doi.org/10.18429/JACoW-eeFACT2016-WET1H1 http://jacow.org/eefact2016/papers/wet1h1.pdf Future e⁺e⁻ colliders will operate with many bunches, short bunch lengths, small emittances, high currents, and small interaction point betas. The stability of the colliding beams with these characteristics will depend on detailed, high precision, and continuous measurements. The various beam measurement requirements and techniques will be discussed using PEP-II observations as a starting point.