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A standard FODO lattice with adjustable momentum compaction

Description: An existing lattice made of identical FODO cells can be modified to have adjustable momentum compaction. The modified lattice consists of repeating superperiods of four FODO cells where every two cells have different horizontal phase advance. In existing FODO cell rings an additional quad bus is required for every two consecutive cells. This allows tuning of the momentum compaction or {gamma}{sub t} could be an imaginary number. A drawback of this modification is relatively large values of the dispersion function (two or three times larger than in the regular FODO cell design).
Date: July 1, 1997
Creator: Trbojevic, D. & Courant, E.
Partner: UNT Libraries Government Documents Department

A study of betatron and momentum collimators in RHIC

Description: The Relativistic Heavy Ion Collider (RHIC) has two interaction regions where {beta}* = 1--2m, with large detectors PHENIX and STAR. The transverse and longitudinal emittances are expected to double in size between one to two hours due to intra-beam scattering which may lead to transverse beam loss. Primary betatron collimators are positioned in the ring to allow efficient removal of particles with large betatron amplitudes. The authors have investigated distributions and losses coming from the out-scattered particles from the primary collimators, as well as the best positions for the secondary momentum and betatron collimators.
Date: July 1, 1997
Creator: Trbojevic, D.; Stevens, A.J.; Harrison, M.A.; Dell, F. & Peggs, S.
Partner: UNT Libraries Government Documents Department

A proton driver for the muon collider source with a tunable momentum compaction lattice

Description: The future Muon Collider will have a luminosity of the order of 10{sup 35} cm{sup {minus}2{minus}1} during 1,000 turns when the muons decay. This requires 10{sup 12} muons per bunch. The muon source is a 30 GeV proton driver with 2.5 10{sup 13} protons per pulse. The proton bunch length should be of the order of 1 ns. Short bunches could be created by a tunable momentum compaction lattice which would bring the momentum compaction to zero in a short time. This isochronous conduction would allow bunches to shear and become very short in time. The authors present a lattice where the momentum compaction is a tunable parameter at fixed horizontal and vertical betatron tunes. The values of the maxima of the dispersion function are kept small. They examine two kinds of lattices, with combined function as well as normal dipole and quadrupole magnets.
Date: July 1, 1997
Creator: Trbojevic, D.; Brennan, J.M.; Courant, E.D.; Roser, T.; Peggs, S.; Ng, K.Y. et al.
Partner: UNT Libraries Government Documents Department

Preparing accelerator systems for the RHIC sextant commissioning

Description: The Relativistic Heavy Ion Collider (RHIC) construction is progressing steadily towards completion in 1999 when beams will circulate in both collider rings. One of the major tests of the RHIC project was the commissioning of the first sextant with gold ion beams in early 1997. This is a report on preparation of the RHIC accelerator systems for the first sextant test. It includes beam position monitors, timing, injection correction through the magnetic septum and kickers, current transformers, flags and the ionization beam profile monitors, beam loss monitors, beam and quench permit link system, power supply controls, and the configuration database system. The software and hardware development and coordination of the different systems before commissioning were regularly checked during bi-weekly, and (later) weekly, progress report meetings.
Date: July 1, 1997
Creator: Trbojevic, D.; Pilat, F. & Ahrens, L.
Partner: UNT Libraries Government Documents Department

A lattice for the muon collider demonstration ring in the RHIC tunnel

Description: The future {mu}{sup +}{mu}{sup {minus}} Muon Collider should have a luminosity of the order of 10{sup 35} cm{sup {minus}2} s{sup {minus}1}, and the energy of 2 x 2 TeV. The authors present here a demonstration machine at a lower energy to test the feasibility of all components involved, which could be placed inside the existing Relativistic Heavy Ion Collider (RHIC) tunnel. The maximum energy of the muons in the RHIC tunnel depends on the maximum attainable field in the dipoles. The maximum energy in the existing RHIC rings for protons is 250 GeV, where the strength of the magnetic field in the dipoles is 3.5 T. A design of the storage ring lattice for a 50 GeV muon demonstration machine is also presented.
Date: July 1, 1997
Creator: Trbojevic, D.; Palmer, R.B.; Courant, E.D.; Gallardo, J.; Peggs, S.; Tepikian, S. et al.
Partner: UNT Libraries Government Documents Department

Alignment of the high beta magnets in the RHIC interaction regions

Description: The betatron functions inside the triplet quadrupoles in the Relativistic Heavy Ion Collider-RHIC are of the order of 1,500 m, necessitating additional attention in the alignment procedure. On each side of the interaction regions eight cryogenic elements (six quadrupoles and two horizontal bending dipoles) are placed inside large cryostats. The quadrupole magnetic centers are obtained by antenna measurements with an accuracy of {+-} 60 {micro}m. The signals from the antenna were cross calibrated with the colloidal cell measurements of the same magnet. The positions of the fiducials are related to the magnet centers during the antenna measurements. Elements are positioned warm inside the cryostats, with offsets to account for shrinkage during the cool down. The supports at the middle of the two central quadrupoles are fixed, while every other element slides longitudinally inside the cryostat during cool down or warm up.
Date: July 1, 1997
Creator: Trbojevic, D.; Jain, A.; Tepikian, S.; Grandinetti, R.; Ganetis, G.; Wei, J. et al.
Partner: UNT Libraries Government Documents Department

RHIC sextant test: Accelerator systems and performance

Description: One sextant of the RHIC Collider was commissioned in early 1997 with beam. We describe here the performance of the accelerator systems, instrumentation subsystems and application software. We also describe a ramping test without beam that took place after the commissioning with beam. Finally, we analyze the implications of accelerator systems performance and their impact on the planning for RHIC installation and commissioning.
Date: August 1, 1997
Creator: Pilat, F.; Trbojevic, D. & Ahrens, L.
Partner: UNT Libraries Government Documents Department

A study of betatron and momentum collimators in RHIC

Description: Two separate accelerator rings in the Relativistic Heavy Ion Collider (RHIC) will provide collisions between equal and unequal heavy ion species up to the gold ions, including the two polarized proton beams. There are six interaction points with two regions with {beta}* = 1--2 m occupied by the large detectors PHENIX and STAR. The transverse and longitudinal emittances of the gold ions are expected to double in size between one to two hours due to intra-beam scattering which may lead to transverse beam loss. Primary betatron collimators are positioned in the ring where the betatron functions have large values to allow efficient removal of particles with large betatron amplitudes. In this report the authors investigated distributions and losses coming from the out-scattered particles from the primary collimators, as well as the best positions for the secondary momentum and betatron collimators. Additional studies of the detector background due to beam halo and other details about the collimation in RHIC are reported elsewhere, while more information about the momentum collimation was previously reported in Momentum Collimation at Q9 by S. Peggs and G.F. Dell.
Date: December 1, 1997
Creator: Trbojevic, D.; Stevens, A.J. & Harrison, M.
Partner: UNT Libraries Government Documents Department