Quadrupole Centering and Beam Steering in the Next Linear Collider Main Linacs1
نویسندگان
چکیده
Accurate measurement of quadrupole-to-BPM center offsets and use of this information in an autosteering algorithm are two essential components of emittance preservation in the Next Linear Collider main linac. We present the results of an analytic/simulation study of possible statistical and systematic limitations on the measurement of quad-BPM center offsets. These results are incorporated in a simulation study of a potential main linac steering algorithm which relies entirely on remote-controlled magnet and RF-structure positioning devices to minimize emittance dilution. The effects of ground motion during the alignment process are also considered. Contributed to Twentieth International Linac Conference, Monterey, California August 21 – 25, 2000 1Work supported by the Department of Energy, Contract DE-AC03-76SF00515. QUADRUPOLE CENTERING AND BEAM STEERING IN THE NEXT LINEAR COLLIDER MAIN LINACS P. Tenenbaum, T.O. Raubenheimer, SLAC, Stanford, CA 94309 USA
منابع مشابه
Quadrupole Centering and Beam Steering in the next Linear Collider Main Linacs
Accurate measurement of quadrupole-to-BPM center offsets and use of this information in an auto-steering algorithm are two essential components of emittance preservation in the Next Linear Collider main linac. We present the results of an analytic/simulation study of possible statistical and systematic limitations on the measurement of quad-BPM center offsets. These results are incorporated in ...
متن کاملDevelopments in Beam-based Alignment and Steering of the next Linear Collider Main Linac
The Next Linear Collider main linacs are 13 km linear accelerators which each contain approximately 750 hybrid iron/permanent-magnet quadrupoles in a FODO array. The small amount of vertical emittance dilution permitted in the main linacs implies a tight tolerance on the RMS distance between the beam and the centers of the quads. We describe two methods for measuring the offsets between the qua...
متن کاملWakefield and Beam Centering Measurements of a Damped and Detuned X-band Accelerator Structure
We present wakefield measurements of a prototype Next Linear Collider (NLC) accelerator structure that was built with dipole mode damping and detuning to suppress the long-range transverse wakefield induced by a beam. In addition, we describe beam centering tests that use as a guide the dipole power coupled out of the structure for damping purposes.
متن کاملQuadrupole Alignment and Trajectory Correc- Tion for Future Linear Colliders: Slc Tests of a Dispersion-free Steering Algorithm
The feasibility of future linear colliders depends on achieving very tight alignment and steering tolerances. All proposals (NLC, JLC, CLIC, TESLA and S-BAND) currently require a total emittance growth in the main linac of less than 30-100% [1]. This should be compared with a 100% emittance growth in the much smaller SLC linac [2]. Major advances in alignment and beam steering techniques beyond...
متن کاملNext-generation Linear Collider Final Focus System Stability Tolerances*
The design of final focus systems for the next generation of linear colliders has evolved largely from the experience gained with the design and operation of the Stanford Linear Collider (SLC) and with the design of the Final Focus Test Beam (FFTB). We will compare the tolerances for two typical designs for a next-generation linear collider final focus system. The chromaticity generated by stro...
متن کامل