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Application of independent component analysis to ac dipole based optics measurement and correction at the Relativistic Heavy Ion Collider
/ Shen, X. (Indiana U.) ; Bai, M (Brookhaven) ; Lee, S.Y (Indiana U.) ; Luo, Y (Brookhaven) ; Marusic, A (Brookhaven) ; Robert-Demolaize, G (Brookhaven) ; Tomás, R (CERN) ; White, S (Brookhaven)
Correction of beta-beat is of great importance for performance improvement of high energy accelerators, like the Relativistic Hadron Ion Collider (RHIC). At RHIC, using the independent component analysis method, linear optical functions are extracted from the turn by turn beam position data of the ac dipole driven betatron oscillation. [...]
2013 - 10 p.
- Published in : Phys. Rev. Spec. Top. Accel. Beams 16 (2013) 111001
APS Published version, local copy: PDF;
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2.
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AC dipole based optics measurement and correction at RHIC
/ Shen, X (Indiana U.) ; Lee, S Y (Indiana U.) ; Bai, M (Brookhaven) ; White, S (Brookhaven) ; Robert-Domolaize, G (Brookhaven) ; Luo, Y (Brookhaven) ; Marusic, A (Brookhaven) ; Tomas, R (CERN)
Independent component analysis (ICA) was applied to the AC dipole based optics measurement at RHIC to extract beta functions as well as phase advances at each BPM. Existence of excessive beta-beat was observed in both rings of RHIC at polarized proton store energy. [...]
2013
Published version from JACoW: PDF;
In : North American Particle Accelerator Conference, Pasadena, CA, USA, 29 Sep - 04 Oct 2013, pp.526-528
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3.
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Optics Measurements and Corrections at RHIC
/ Bai, M (Brookhaven) ; Aronson, J (Brookhaven) ; Blaskiewicz, M (Brookhaven) ; Luo, Y (Brookhaven) ; Robert-Demolaize, G (Brookhaven) ; White, S (Brookhaven) ; Vanbavinckhove, G (CERN)
The further improvement of RHIC luminosity performance requires more precise understanding of the RHIC modeling. Hence, it is necessary to minimize the beta-beat, deviation of measured beta function from the calculated beta functions based on an model. [...]
2012 - 3 p.
- Published in : Conf. Proc.: C1205201 (2012) , pp. TUPPC056
External link: Published from JaCoW
In : 3rd International Particle Accelerator Conference, New Orleans, LA, USA, 20 - 25 May 2012, pp.1299-1301
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4.
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Optics Corrections at RHIC
/ Vanbavinckhove, G (CERN) ; Bai, M (Brookhaven) ; Robert-Demolaize, G (Brookhaven)
Excessive beta-beat, deviation of measured beta function from the calculated beta functions based on an model, in high energy colliders can lead to large deviation of beta function at collision point as well as other adverse ef- fects. The segment-by-segment technique was successfully demonstrated in the LHC operation for reducing the beta- beat. [...]
CERN-ATS-2011-159.-
Geneva : CERN, 2011 - 3 p.
Fulltext: PDF; External link: Published version from JACoW
In : 2nd International Particle Accelerator Conference, San Sebastian, Spain, 4 - 9 Sep 2011, pp.WEPC031
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5.
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Impact of Arc Phase Advance Tuning on Chromatic Optics in the RHIC*
/ Calaga, R (Brookhaven) ; de Maria, R ; Miyamoto, R (Brookhaven) ; Robert-Demolaize, G (Brookhaven) ; Tomas, R (CERN) ; Vanbavinckhove, G (NIKHEF, Amsterdam) ; White, S (Brookhaven)
The phase advance between the two interaction points in RHIC is optimized for dynamic aperture for a initial design beta-star. This may not hold true as RHIC presently operates with a considerably reduced beta-star. [...]
CERN-ATS-2011-178.-
Geneva : CERN, 2011 - 3 p.
Fulltext: PDF; External link: Published version from JACoW
In : 2nd International Particle Accelerator Conference, San Sebastian, Spain, 4 - 9 Sep 2011, pp.TUPZ034
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6.
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LHC beam-beam compensation studies at RHIC
/ Fischer, W (Brookhaven) ; Luo, Y (Brookhaven) ; Abreu, N (Brookhaven) ; DeMaria, R (Brookhaven) ; Calaga (Brookhaven) ; Montag, C (Brookhaven) ; Robert-Demolaize, G (Brookhaven) ; Kim, H J (Fermilab) ; Sen, T (Fermilab)
Long-range and head-on beam-beam effects are expected to limit the LHC performance with design parameters. To mitigate long-range effects current carrying wires parallel to the beam were proposed. [...]
FERMILAB-CONF-09-722-APC.-
2010
Fulltext: HTML; Published version from PAC09: PDF;
In : Particle Accelerator Conference 2009, Vancouver, Canada, 04 - 08 May 2009, pp.WE3PBI03
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7.
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Procedures and accuracy estimates for beta-beat correction in the LHC
/ Tomás, R ; Brüning, Oliver Sim ; Calaga, R ; Fartoukh, Stéphane David ; Franchi, A ; Giovannozzi, Massimo ; Papaphilippou, Y ; Peggs, S ; Zimmermann, Frank
The LHC aperture imposes a tight tolerance of 20% on the maximum acceptable beta-beat in the machine. An accurate knowledge of the transfer functions for the individually powered insertion quadrupoles and techniques to compensate beta-beat are key prerequisites for successful operation with high intensity beams. [...]
LHC-PROJECT-Report-941; CERN-LHC-Project-Report-941.-
Geneva : CERN, 2006 - 4 p.
Access to fulltext document: PDF; External link: Published version from JACoW
In : 10th European Particle Accelerator Conference, Edinburgh, UK, 26 - 30 Jun 2006, pp.2023
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8.
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RHIC BBLR measurements in 2009
/ Calaga, R (Brookhaven) ; Fischer, W (Brookhaven) ; Robert-Demolaize, G (Brookhaven)
Long range beam-beam experiments were conducted during the Run 2009 in the Yellow and the Blue beams of the RHIC accelerator with DC wires. The effects of a long-range interaction with a DC wire on colliding and non-colliding bunches with the aid of beam losses, orbits, tunes were studied. [...]
CERN-ATS-2010-035.-
Geneva : CERN, 2010 - 3 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.MOPEC024
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9.
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Halo removal experiments with hollow electron lens in the BNL Relativistic Heavy Ion Collider
/ Gu, X (Brookhaven) ; Fischer, W (Brookhaven) ; Altinbas, Z (Brookhaven) ; Drees, A (Brookhaven) ; Hock, J (Brookhaven) ; Hulsart, R (Brookhaven) ; Liu, C (Brookhaven) ; Marusic, A (Brookhaven) ; Miller, T A (Brookhaven) ; Minty, M (Brookhaven) et al.
A hollow electron beam has been proposed as an active control tool to remove the beam halo from high-energy, high-current hadron or ion machines (such as the High-Luminosity Large Hadron Collider). To study the halo removal rate and assess the effect on the ion beam core, one of the two electron lenses in the Relativistic Heavy Ion Collider was changed from a Gaussian beam profile to a hollow profile. [...]
2020 - 15 p.
- Published in : Phys. Rev. Accel. Beams 23 (2020) 031001
Fulltext: PDF;
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