Dynamic aperture evaluation at the current working point for RHIC polarized proton operation

Luo, Yan; Bai,; Beebe-Wang,; Fischer, Monika; Jain,; Montag,; Roser,; Tepikian,; Trobjevic,

doi:10.1109/pac.2007.4440104

Cited by 8 publications

(9 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A realistic nonlinear RHIC model was built by including the complete set of multipole components in the body and ends of all IR magnets fkom either measured or estimated data. The simulation studies using this non-linear model have been performed and are also presented at this conference [5,6].…”

Section: Resultsmentioning

confidence: 99%

Realistic non-linear model and field quality analysis in RHIC interaction regions

Beebe‐Wang¹,

Jain²

2007

2007 IEEE Particle Accelerator Conference (PAC)

Self Cite

View full text Add to dashboard Cite

The existence of multipole components in the dipole and quadrupole magnets is one of the factors limiting the beam stability in the RHIC operations. So, a realistic nonlinear model is crucial for understanding the beam behavior and to achieve the ultimate performance in RHIC. A procedure is developed to build a non-linear model using the available multipole component data obtained h m measurements of RHIC magnets. We first discuss the measurements performed at different stages of manufacturing of the magnets in relation to their current state in RHIC. We then describe the procedure to implement these measurement data into tracking models, including the implementation of the multipole feed down effect due to the beam orbit offset from the magnet center. Finally, the field quality analysis in the RHIC interaction regions (IR) is presented.

show abstract

Section: Resultsmentioning

confidence: 99%

Realistic non-linear model and field quality analysis in RHIC interaction regions

Beebe‐Wang¹,

Jain²

2007

2007 IEEE Particle Accelerator Conference (PAC)

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the design phase, the dynamic aperture (DA), the amplitude of the region in phase space where stable motion occurs, has been a key quantity for the specification of the performance of the CERN LHC; as is also true for all modern colliders and storage rings, such as Tevatron [1][2][3][4], HERA [5][6][7][8][9], RHIC [10], or the Superconducting Super Collider (SSC) [11,12]. The case of synchrotron light sources, damping rings or, in general, lepton machines is somewhat different and is not considered here; the presence of strong damping due to synchrotron radiation, implies that only the so-called "short-term" dynamic aperture, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…This plot represents a set of initial conditions in the polar grid of normalised physical space for one configuration of the LHC machine at 3.5 TeV, Beam 1 and optics with β * corresponding to the injection configuration (see the next Section for more details). The blue markers identify initial conditions that are not stable for up to 10 5 turns. The marker size is proportional to the number of turns for which the motion is bounded.…”

Section: Introductionmentioning

confidence: 99%

“…The marker size is proportional to the number of turns for which the motion is bounded. The red markers identify initial conditions that are stable for up to 10 5 turns. The regions provide a direct indication of the size of the DA (red region) and of the chaotic area (blue region) where the particles feature an increasing amplitude, which eventually leads to the loss of the particles.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic aperture computation for the as-built CERN Large Hadron Collider and impact of main dipoles sorting

Fartoukh

Giovannozzi

2012

Nuclear Instruments and Methods in Physics Research Section A:

View full text Add to dashboard Cite

During the design phase of the CERN Large Hadron Collider the dynamic aperture, i.e., the amplitude of the domain in phase space where the particle motion is stable, was used as one of the most important figures-of-merit to specify the field quality of the various types of superconducting magnets and to quantify the machine performance. The programme of magnetic measurements performed during the production and acceptance testing of the magnets generated a large amount of information, which was used to obtain a best estimate of the dynamic aperture of the actual machine. In this paper the results of massive numerical simulations based on the measured field quality of several optical configurations and beam energies, are presented and discussed. The effect of the sorting of the main dipoles on the final value of the dynamic aperture has also been studied and the results are reviewed in detail. AbstractDuring the design phase of the CERN Large Hadron Collider the dynamic aperture, i.e., the amplitude of the domain in phase space where the particle motion is stable, was used as one of the most important figures-of-merit to specify the field quality of the various types of superconducting magnets and to quantify the machine performance. The programme of magnetic measurements performed during the production and acceptance testing of the magnets generated a large amount of information, which was used to obtain a best estimate of the dynamic aperture of the actual machine. In this paper the results of massive numerical simulations based on the measured field quality of several optical configurations and beam energies, are presented and discussed. The effect of the sorting of the main dipoles on the final value of the dynamic aperture has also been studied and the results are reviewed in detail.

show abstract

“…Currently the nominal uncollisional working points for the Blue and Yellow rings are set to (28.685, 29.695) and (28.695, 29.685, respectively. With bunch intensity 2.0 × 10 11 or larger, there will be no enough tune space to hold the beam-beam tune spread [1,2]. During the summer shutdown of RHIC 2006, the number of the power supplies for the arc chromatic sextupoles were doubled from 12 to 24 to allow correction of the second order chromaticities [3,4].…”

Section: Introductionmentioning

confidence: 99%

Dynamic aperture evaluation of the proposed lattices for the RHIC 2009 polarized proton run

Luo¹,

Bai²,

Beebe‐Wang³

et al. 2009

Self Cite

View full text Add to dashboard Cite

show abstract

Dynamic aperture evaluation at the current working point for RHIC polarized proton operation

Cited by 8 publications

References 2 publications

Realistic non-linear model and field quality analysis in RHIC interaction regions

Realistic non-linear model and field quality analysis in RHIC interaction regions

Dynamic aperture computation for the as-built CERN Large Hadron Collider and impact of main dipoles sorting

Dynamic aperture evaluation of the proposed lattices for the RHIC 2009 polarized proton run

Contact Info

Product

Resources

About