First observation of luminosity-driven extraction using channeling with a bent crystal

Carrigan, R. A.; Chen, D.; Jackson, G.; Mokhov, N.; Murphy, C.T.; Baker, S.; Bogacz, S.A.; Cline, D.; Ramachandran, S.; Rhoades, J.; Rosenzweig, J.; Aseev, A.A.; Biryukov, V.M.; Taratin, A.M.; Ellison, James A.; Khanzadeev, A.; Prokofieva, Y.; Samsonov, V.; Solodov, G.; Newberger, Barry S.; Tsyganov, E.; Shih, H.-J.; Gabella, W.; Cox, B. E.; Golovatyuk, V.; McManus, A. P.

doi:10.1103/physrevstab.1.022801

Cited by 33 publications

(13 citation statements)

References 13 publications

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“…Similar extraction experiments were performed at the Tevatron using bent crystals [5]. Channeling efficiencies of 35 11% were obtained during luminosity driven proton extraction, in agreement with simulation and Eq.…”

Section: Channeling Resultssupporting

confidence: 83%

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Results of bent crystal channeling and collimation at the Relativistic Heavy Ion Collider

Fliller

Drees

Gassner

et al. 2006

Phys. Rev. ST Accel. Beams

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Bent crystal channeling has been observed with protons and fully stripped gold ions in the Relativistic Heavy Ion Collider (RHIC). Prior to 2003, a bent crystal was installed in one ring of RHIC as the first stage of a two stage collimation system. The observed channeling efficiency was approximately 25%, less than half of original predictions. We show that this is due to a difference between the model and real Twiss parameters at the crystal location and our improved understanding of the beam halo. Collimation using the crystal was unsuccessful and raised background at the STAR detector by as much as a factor of 2 because of the low channeling efficiency. We give a report of our channeling studies in RHIC and describe our experience using the bent crystal as a collimator. The results are discussed and compared to simulations and theoretical predictions.

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Section: Channeling Resultssupporting

confidence: 83%

“…It is possible to use bent crystal channeling to deflect particle beams [3][4][5][6][7]. If the primary collimator is replaced with a bent crystal, it will be possible to deflect halo particles away from the beam core.…”

Section: Introductionmentioning

confidence: 99%

Results of bent crystal channeling and collimation at the Relativistic Heavy Ion Collider

Fliller

Drees

Gassner

et al. 2006

Phys. Rev. ST Accel. Beams

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“…To take into account the fact that the circulating particles are efficiently removed from the ring by a crystal extraction as well, one would require a recurrent procedure of summation: instead of ΣF k one has to sum ΣF * k , where F * k =F k (1 − F * k−1 ). This "recurrent" correction doesn't practically affect our earlier SPS calculations; for Tevatron it converts 40.8% into 34.1%, whereas the measured value is on the order of 30% [13], and the Monte Carlo simulation predicted about 35% [3].…”

Section: Experimental Checkmentioning

confidence: 83%

Analytical theory of multipass crystal extraction

Biryukov¹,

Murphy²

1997

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An analytical theory for the efficiency of particle extraction from an accelerator by means of a bent crystal is proposed. The theory agrees with all the measurements performed in the broad energy range of 14 to 900 GeV, where the efficiency range also spans over two decades, from ∼0.3% to ∼30%. Possibilities for crystal extraction from sub-GeV accelerators and from muon colliders are discussed. *

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“…For channeling simulations we apply a Monte Carlo code CATCH [16] successfully used for prediction of experiments at CERN SPS [9], IHEP U-70 [6], Tevatron [7], RHIC [8] and KEK [17] and crystal applications at the LHC [10,11].…”

Section: Crystal Efficiencymentioning

confidence: 99%

Crystal channeling of LHC forward protons with preserved distribution in phase space

Biryukov

2007

Physics Letters B

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We show that crystal can trap a broad (x, x', y, y', E) distribution of particles and channel it preserved with a high precision. This sampled-and-hold distribution can be steered by a bent crystal for analysis downstream. In simulations for the 7 TeV Large Hadron Collider, a crystal adapted to the accelerator lattice traps 90% of diffractively scattered protons emerging from the interaction point with a divergence 100 times the critical angle. We set the criterion for crystal adaptation improving efficiency ~100-fold.Proton angles are preserved in crystal transmission with accuracy down to 0.1 µrad. This makes feasible a crystal application for measuring very forward protons at the LHC.

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First observation of luminosity-driven extraction using channeling with a bent crystal

Cited by 33 publications

References 13 publications

Results of bent crystal channeling and collimation at the Relativistic Heavy Ion Collider

Results of bent crystal channeling and collimation at the Relativistic Heavy Ion Collider

Analytical theory of multipass crystal extraction

Crystal channeling of LHC forward protons with preserved distribution in phase space

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