Tevatron beam halo collimation system: design, operational experience and new methods

Mokhov, N.; Annala, J.; Carrigan, R. A.; Church, M.; Drozhdin, A.I.; Johnson, Todd R.; Reilly, R.E.; Shiltsev, Vladimir; Stancari, G.; Still, D.; Valishev, Alexander; L, Zhang, X; Zvoda, V.

doi:10.1088/1748-0221/6/08/t08005

Cited by 29 publications

(27 citation statements)

References 28 publications

(46 reference statements)

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“…Channeling in bent crystals has been thoroughly studied for protons with the purpose of, e.g., proton extraction at accelerator facilities [1][2][3] and for collimation [4][5][6]. Much less is known about the efficiency of channeling of electrons in bent crystals.…”

Section: Introductionmentioning

confidence: 99%

Channeling, volume reflection, and volume capture study of electrons in a bent silicon crystal

Wistisen

Uggerhøj

Wienands

et al. 2016

Phys. Rev. Accel. Beams

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We present the experimental data and analysis of experiments conducted at SLAC National Accelerator\ud Laboratory investigating the processes of channeling, volume-reflection and volume-capture along the\ud (111) plane in a strongly bent quasimosaic silicon crystal. These phenomena were investigated at 5\ud energies: 3.35, 4.2, 6.3, 10.5, and 14.0 GeV with a crystal with bending radius of 0.15 m, corresponding to\ud curvatures of 0.053, 0.066, 0.099, 0.16, and 0.22 times the critical curvature, respectively. Based on the\ud parameters of fitting functions we have extracted important parameters describing the channeling process\ud such as the dechanneling length, the angle of volume reflection, the surface transmission, and the widths of\ud the distribution of channeled particles parallel and orthogonal to the plane

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Section: Introductionmentioning

confidence: 99%

Channeling, volume reflection, and volume capture study of electrons in a bent silicon crystal

Wistisen

Uggerhøj

Wienands

et al. 2016

Phys. Rev. Accel. Beams

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“…Inbetween the two runs, the collimation system of the Tevatron was upgraded [9]. During Collider Run I, the Tevatron used a single stage collimation system that consisted of 1 m long solid absorbers which allowed the Fermi National Accelerator Lab (Fermilab) to raise the Tevatron efficiency of the fast resonant extraction system by a factor 5 [13].Using this system at Tevatron, one obtained a low cleaning efficiency close to 0.5 [13].…”

Section: Tevatron Collimation Systemmentioning

confidence: 99%

“…During Collider Run I, the Tevatron used a single stage collimation system that consisted of 1 m long solid absorbers which allowed the Fermi National Accelerator Lab (Fermilab) to raise the Tevatron efficiency of the fast resonant extraction system by a factor 5 [13].Using this system at Tevatron, one obtained a low cleaning efficiency close to 0.5 [13]. This system was insufficient and caused operational limitations, such that in Collider Run II, a two-stage automated collimation system was implemented [9]. At Tevatron collimation is a discrete process in which the beam halo is regularly removed.…”

Section: Tevatron Collimation Systemmentioning

confidence: 99%

“…They create a Root Mean Square (RMS) transverse kick of 17 µrad at 980 GeV [11]. The secondary collimators are 1.5 mm steel blocks placed at 6 σ [9]. Additionally a new control system was implemented that would allow the fast processing of beam loss monitor data and a fast beam intensity feedback control, in which the full travel of the collimator took 15 sec [9].…”

Section: Tevatron Collimation Systemmentioning

confidence: 99%

“…The secondary collimators are 1.5 mm steel blocks placed at 6 σ [9]. Additionally a new control system was implemented that would allow the fast processing of beam loss monitor data and a fast beam intensity feedback control, in which the full travel of the collimator took 15 sec [9]. Next to this major upgrade, the system was upgraded on a regular basis, including the installation of a tertiary collimator in 2003.…”

Section: Tevatron Collimation Systemmentioning

confidence: 99%

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Experimental and Numerical Studies on the Proposed Application of Hollow Electron Beam Collimation for the LHC at CERN

Moens

2013

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This thesis work was carried out in the framework of the U.S. LHC Accelerator Research Program (US-LARP), a collaboration between the European Organization for Nuclear Research (CERN) and the U.S. Department of Energy. The first half of the work was completed at Fermilab (USA), the location of the Tevatron, a proton-antiproton collider and the second largest particle collider in the world. The second half was completed at CERN (Switzerland), the location of the largest proton collider in the world (Large Hadron Collider (LHC)).This thesis characterizes a Hollow Electron Beam (HEB) for possible usage at the LHC to enhance its collimation through Hollow Electron Beam Lenses (HEBLs). Collimation is a long established principle in high energy particle accelerators. Hollow Electron Beam Collimation (HEBC) aims to enhance current collimation systems by controlling diffusion of primary halo particles into the limiting aperture. It works on the principle of a transverse radial electric field that kicks the primary halo particles outwards upon each pass in a multi-pass system. The transverse field is produced by a HEB that is coaxially aligned with the accelerator beam, producing a negligible electric field in the center and a strong transverse electric field at amplitudes higher than the inner radius of the electron beam. Ideally, halo particles are affected without perturbation of the beam core. One of the main advantages of this system is to decrease the dependence on instantaneous loss spikes and beam jitter. A solid experimental basis of HEBC was accumulated at the Tevatron. The application of this technique at the LHC is now under investigation.The aim of this thesis is to present a preliminary report to support a future optimal conceptual design report. It characterizes the available hardware in order to facilitate the design of a Hollow Electron Gun (HEG) for the LHC, characterizes the effect on beam diffusion by determining the transverse electric fields of the electron beam and initiates 3D simulations in order to determine the effect of the HEBL on the beam core.

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Emittance Growth and Beam Loss

Carrigan

Lebedev

Mokhov

et al. 2014

Accelerator Physics at the Tevatron Collider

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Tevatron beam halo collimation system: design, operational experience and new methods

Cited by 29 publications

References 28 publications

Channeling, volume reflection, and volume capture study of electrons in a bent silicon crystal

Channeling, volume reflection, and volume capture study of electrons in a bent silicon crystal

Experimental and Numerical Studies on the Proposed Application of Hollow Electron Beam Collimation for the LHC at CERN

Emittance Growth and Beam Loss

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