The facilities ot A roomie National Laboratory are ov^ned by the United Mat ment Under the terms, ot a contract (W-it-10 li-Kn£-^s ' between the I' .s Kiu-rii\ Ke Development Administration. A rg untie L'ni vet 1 >it :vs A.-jM^uiUnn ,mii 1 he Unn er-> uy the University employs the stall and operates the Laboratory ;n aaurd.i IK e w ith p programs formulated, approved and re\ lewed by the A-> MH :.
Table I. The Intenae Pulled Neutron Source (IPNS) accelerator system haa managed a 40Z Increase In time average bean current over the last two years. Currenta of up to 15.6 uA (3.25 x 10 protons at 30 Hz) have been successfully accelerated, and cleanly extracted. Our high current operation deaanda low loaa beaa handling to permit hands-on maintenance.Synchrotron beaa handling efficiencies of iOX are routine. A new HĨ on aource which was installed .in March of 1983 offered the opportunity to get above 8 pA but an Instability caused unacceptable loaaea when attempting to operate at 10 uA and above.Siaple techniques to control the instabilities were Introduced and have worked well. These techniques are discussed below. Other iaproveaents in the regulation of various power supplies have provide'* greatI7 Improved low energy orbit stability and contributed substantially to the Increased beam current. These improvements are discussed in a paper 1 presented at this conference.
A series of machine studies has been done with the Zero Gradient Synchrotron (ZGS) at Argonne National Laboratory in order to better understand the phenomena associated with the acceleration of polarized protons and to determine the feasibility of acceleration to energies higher than the 12 GeV/c available at the ZGS. We also investigated the question of how long polarized protons can remain in storage rings without losing excessive polarization. The three topics investigated were: 1. The adiabatic crossing of an intrinsic depolarizing resonance. 2. The depolarization due to imperfection resonances. 3. The survival time of polarization on a long flattop. This paper is a preliminary report of these three investigations. ADIABATIC CROSSING OF AN INTRINSIC DEPOLARIZING RESONANCE The purpose of this test was to determine whether the beam polarization v~ uld simply change sign without changing its magnitude when a very strong depolarizing resonance was crossed1%2~% slowly enough. This was predicted by some theoretical mod~s:' "-' Such a spin flip could provide a relatively simple technique "for crossing the strong depolarizing resonances in strong focussing accelerators. This would be much easier than the quadrupole *Work supported by U.S. Energy Research and Development A dminist ration.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.