First Name: P
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Last Name: Zhou
Full Name: Zhou, P.
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4 papers
| title: | Envelope instability in the Fermilab Booster |
| format: | conference procceeding |
| conference: | 1991 Particle Accelerator Conference |
| year: | 1991 |
| 3 authors: | | | |
| abstract: | The transverse emittance in the FNAL (Fermi National Accelerator Laboratory) Booster grows at a high beam intensity, in a time less than 100 turns. An examination is made of the possible contributions to the fast emittance growth from coherent instability of the beam envelope. Theoretical analysis, through the use of envelope equations, is employed to predict the dependence of envelope instability on the peak current of the Booster beam. These predictions are compared to the results of multiparticle tracking calculations. (11 References). |
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| title: | Ion clearing by cyclotron resonance shaking |
| format: | conference procceeding |
| conference: | 1991 Particle Accelerator Conference |
| year: | 1991 |
| 2 authors: | | |
| abstract: | A new concept in ion clearing for storage rings, that of resonant removal of ions in dipoles by shaking the beam horizontally near the ion cyclotron frequency is discussed. This method of beam shaking is similar to the variations on ion bounce shaking but has advantages in requiring a narrower bandwidth of shaking frequencies and in much higher achievable ion kinetic energies. The results of analytical theory, and computer simulations are discussed. (7 References). |
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| title: | Progress towards a turn-by-turn beam profile monitor for the Fermilab Booster |
| format: | conference procceeding |
| conference: | Second Annual Workshop on Accelerator Instrumentation |
| year: | 1991 |
| 4 authors: | | | | |
| abstract: | Describes the design and pre-installation testing of a turn-by-turn beam profile monitor for the Fermilab Booster. this non-intrusive monitor collects the ions created by beam particle collisions with the residual gas onto a microchannel plate (MCP) detector using a large (50-100 kV/m) clearing field, to obtain a projected image of the beam distribution in a given plane. The output of the MCP is an anode strip array which gives a 48 channel image with 1.5 mm resolution. The strip current signal is digitized on a turn-by-turn basis to potentially generate more than 16000 beam profiles in one Booster cycle. The purpose of this device is to aid in understanding the effects which drive the transverse emittance growth in the Booster, which may have time scales as short as one turn. (6 References). |
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| title: | Envelope Instability in Low-Energy Proton Synchrotrons |
| format: | unknown |
| year: | 1990 |
| 2 authors: | | |
| abstract: | In this paper we investigate the limits on beam intensity in low-energy proton synchrotrons due to the instability of the beam envelope. This instability has been previously examined in the context of space charge dominated ion beams, in particular for inertial confinement fusion applications. We generalize the formalism of beam envelope evolution to include effects found in circular accelerators, i.e. curvature focusing and momentum dispersion. Several example lattices are analyzed to determine intensity limits imposed by onset of envelope instability; it is found that the instability can occur without depressing the phase advance below 90-degrees per cell. |
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