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Title: INSTABILITY ISSUES AT THE SNS STORAGE RING

Abstract

The impedance and beam instability issues of the SNS storage ring is reviewed, and the effort toward solutions at the BNL is reported. Some unsettled issues are raised, indicating the direction of planned works.

Authors:
Publication Date:
Research Org.:
Brookhaven National Lab., Upton, NY (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
755046
Report Number(s):
BNL-67299; KA040301
R&D Project: AD004ADRD; KA040301; TRN: US0005131
DOE Contract Number:
AC02-98CH10886
Resource Type:
Conference
Resource Relation:
Conference: WORK ON INSTABILITIES OF HIGH INTENSITY HADRON BEAMS IN RINGS, UPTON, NY (US), 06/28/1999--07/01/1999; Other Information: PBD: 28 Jun 1999
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; PARTICLE BEAMS; BNL; IMPEDANCE; INSTABILITY; STORAGE RINGS; BEAM DYNAMICS

Citation Formats

ZHANG,S.Y. INSTABILITY ISSUES AT THE SNS STORAGE RING. United States: N. p., 1999. Web.
ZHANG,S.Y. INSTABILITY ISSUES AT THE SNS STORAGE RING. United States.
ZHANG,S.Y. 1999. "INSTABILITY ISSUES AT THE SNS STORAGE RING". United States. doi:. https://www.osti.gov/servlets/purl/755046.
@article{osti_755046,
title = {INSTABILITY ISSUES AT THE SNS STORAGE RING},
author = {ZHANG,S.Y.},
abstractNote = {The impedance and beam instability issues of the SNS storage ring is reviewed, and the effort toward solutions at the BNL is reported. Some unsettled issues are raised, indicating the direction of planned works.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1999,
month = 6
}

Conference:
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  • The impedance and beam instability issues of the SNS storage ring is reviewed, and the effort toward solutions at the BNL is reported. Some unsettled issues will be raised, indicating the direction of planned works.
  • The recent widespread interest in B Factories with very high (>10/sup 33/ cm/sup -2/ -sec/sup -1/) luminosity has encouraged proposals from organizations in several continents. Storage ring based machines have the advantage of many machine-decades of experience upon which to base designs. Peak luminosities of 10/sup 32/ cm/sup -2/ -sec/sup -1/ have been achieved at a storage ring operating at energies appropriate for B meson production. The high currents necessary for these luminosities present the most diffucult technical problems in operating such a machine. Large higher mode power, synchrotron radiation power, and fundamental RF power coupled to the beam pushmore » technology well beyond that achieved in present machines. In addition, careful control of optics in double rings is required to achieve maximum luminosity.« less
  • In the Spallation Neutron Source (SNS) storage ring, the machine cycle is dominated by the multiturn injection. Therefore, the beam loading issues are quite different from the conventional beam loading. The evolution of the particle distribution due to beam loading needs attentions. If not corrected, the beam loading effect will lead to a bunch to bucket mismatch in the injection, causing bunch leakage into the interbunch gap. The bunch leakage will increase the extraction beam loss, and lower the e-p instability threshold. On the other hand, the control of bunch leakage necessitates the beam loading factor to be small. Therefore,more » beam stabilities associated with the beam loading automatically satisfied. In this article, the simulation of the SNS beam loading effect (together with the space charge effect) will be presented. Same method has been applied to the PSR, where some beam loading effect is shown.« less
  • This paper concentrates on generic R D and design issues of asymmetric colliders via a specific example, namely a 9 GeV {times} 3 GeV collider based on PEP at SLAC. An asymmetric e{sup +}-e{sup -} collider at the Y(4s) and with sufficiently high luminosity (10{sup 33}-10{sup 34} cm{sup -2} s{sup -1}) offers the possibility of studying mixing, rare decays, and CP violation in the B{bar B} meson system, as well as beautiful'' tau-charm physics, and has certain qualitative advantages from detection and machine design points of view. These include: the energy constraint; clean environment ({approximately}25% B{sup +}B{sup -}, B{sup 0}{barmore » B}{sup 0}); large cross section (1 nb); vertex reconstruction (from the time development of space-time separated B and {bar B} decays due to moving center-of-mass); reduced backgrounds; greatest sensitivity to CP violation in B {yields} CP eigenstate; the possibility of using higher collision frequencies, up to 100 MHz, in a head-on colliding mode using magnetic separation. It is estimated that for B {yields} {Psi}K{sub s}, an asymmetric collider has an advantage equivalent to a factor of five in luminosity relative to a symmetric one. There are, however, questions with regard to the physics of the asymmetric beam-beam coulomb interaction that may limit the intrinsic luminosity and the possibility of realizing the small beam pipes necessary to determine the vertices. 16 refs., 2 figs.« less
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