@misc{oai:ir.soken.ac.jp:00000623,
 author = {Foguel, Vladimir and フォーゲル, ウラジミール and FORGUEL, Vladimir},
 month = {2016-02-17, 2016-02-17},
 note = {The design of future multi-bunch e+e- linear collider is based on beams accelerated in very high gradient accelerator structures and having extrernely small beam sizes in the collision point.  For preservation of an emittance growth along the linear collider, high resolution and high accuracy BPMs are necessary.  The requirements for BPMs in a LC depend on which part of LC they are installed in and do also on many other factors.  In main linacs, where the number of BPMs will be around 4000, the cost of BPMs and their electronic circuits and the impedance of the BPM are most important factors.  The resolution and accuracy of BPMs in this part should be comparable with the machining accuracy of accelerator structures and will be about 0.2-0.3 micrometer.  It is preferable if some of these BPMs are capable of measuring the beam angle as well.  For this purpose, a closed cavity BPM operated at frequency of 6424 MHz was proposed, and calculations and experiments for study of the beam position and angle measurement resolutions were made.  In the final focus system, where the beam size comes down to a few nanometers, the required BPM resolution is about one nanometer and thus a special type of high resolution BPM is needed.  This BPM also should be able to identify the position of each bunch in a multi-bunch train.  A cavity sensor was proposed, which has a position resolution of about 1 nm.  Another type of special cavity sensor was also proposed for measurement of the bunch position in a train relative to each other.  To have the required high accelerating gradient along a linac and to produce an energy spread required by the BNS damping, we have to keep the phase between a beam and the RF accelerating voltage within an accuracy of about 1 degree.  For many usages, we also need to know the bunch length distribution along a linac.  This information is especially important when we first time start the beam operation.  A special phase and bunch length sensor was proposed, which has combined functions of both of them in one device.  Calculations and experimental results are presented., 総研大乙第113号},
 title = {Beam instrumentation in linacs for a Linear Colleder (LC)},
 year = {}
}