High-efficiency multipass extraction of 70-GeV protons from an accelerator with a short bent crystal

Afonin, A. G.; Архипенко, А. А.; Баранов, В. И.; Biryukov, V.M.; Chesnokov, Yu. A.; Gavrilushkin, V. A.; Gres, V. N.; Kotov, V.I.; Maisheev, V. A.; Minchenko, A. V.; Терехов, В. И.; Troyanov, E. F.; Zelenov, V.A; Chunin, B. A.; Denisov, A.S.; Gordeeva, M. G.; Ivanov, Yu. M.; Petrunin, A.; Skorobogatov, V. V.

doi:10.1016/s0370-2693(98)00940-x

Cited by 42 publications

(28 citation statements)

References 8 publications

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“…In PNPI, the technique of "O"-shaped crystals of small size ( Fig. 2) was applied [20]. In IHEP, "strip" type of crystal deflector was invented ( Fig.…”

Section: High Efficiency Channelingmentioning

confidence: 99%

“…The effect of shortening the crystal on the efficiency of multi-turn extraction is explained by Figure 1, where shown are both the predicted [37] dependence of the IHEP crystal extraction efficiency as a function of the crystal length, and some history of the measurements since 1997 [20][21][22][33][34][35][36][37]. Here, two very fresh and very interesting experimental points (squares) [38] have been added to the plot, obtained with a new bending technique of quasi-mosaic crystals.…”

Section: High Efficiency Channelingmentioning

confidence: 99%

“…[23][24][25][26]. The predictions of this code were earlier successfully tested for variety of channeling-related phenomena like feed-out [27] and feed-in [28], energy losses [29], and in particular for crystal extraction at CERN SPS [8,11,12], Tevatron [15], RHIC [30][31][32], and IHEP U-70 [20][21][22][33][34][35][36][37].…”

Section: High Efficiency Channelingmentioning

confidence: 99%

“…The existence of multi-pass mechanism was confirmed in early experiments at CERN SPS and Tevatron [9,15]. To clarify this mechanism a new experiment was started at IHEP at the end of 1997, with intention to test very short crystals and achieve very high efficiencies of extraction [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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The schemes of proton extraction from IHEP accelerator using bent crystals

Afonin

Baranov

Biryukov

et al. 2005

Nuclear Instruments and Methods in Physics Research Section B:

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Abstract. IHEP Protvino has pioneered the wide practical use of bent crystals as optical elements in high-energy beams for beam extraction and deflection on permanent basis since 1989. In the course of IHEP experiments, crystal channeling has been developed into efficient instrument for particle steering at accelerators, working in predictable, reliable manner with beams of very high intensity over years. Crystal systems extract 70 GeV protons from IHEP main ring with efficiency of 85% at intensity of 10 12 , basing on multi-pass mechanism of channeling proposed theoretically and realised experimentally at IHEP. Today, six locations on the IHEP 70-GeV main ring of the accelerator facility are equipped by crystal extraction systems, serving mostly for routine applications rather than for research and allowing a simultaneous run of several particle physics experiments, thus significantly enriching the IHEP physics program. The long successful history of large-scale crystal exploitation at IHEP should help to incorporate channeling crystals into accelerator systems worldwide in order to create unique systems for beam delivery. We report recent results from the research and exploitation of crystal extraction systems at IHEP.

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“…In PNPI, the technique of "O"-shaped crystals of small size ( Fig. 2) was applied [20]. In IHEP, "strip" type of crystal deflector was invented ( Fig.…”

Section: High Efficiency Channelingmentioning

confidence: 99%

Section: High Efficiency Channelingmentioning

confidence: 99%

Section: High Efficiency Channelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The schemes of proton extraction from IHEP accelerator using bent crystals

Afonin

Baranov

Biryukov

et al. 2005

Nuclear Instruments and Methods in Physics Research Section B:

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“…There has also been experimental evidence that a multipass mechanism is responsible for efficient crystal extraction [5,6]. To clarify this mechanism a new experiment was started at IHEP at the end of 1997, with the intention of testing very short crystals and achieving very high efficiencies of extraction [7,8].…”

mentioning

confidence: 99%

High-Efficiency Beam Extraction and Collimation Using Channeling in Very Short Bent Crystals

et al. 2001

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A silicon crystal was used to channel and extract 70 GeV protons from the U-70 accelerator with an efficiency of 85.3 6 2.8%, as measured for a beam of ϳ10 12 protons directed towards crystals of ϳ2 mm length in spills of ϳ2 s duration. The experimental data follow very well the prediction of Monte Carlo simulations. This demonstration is important in devising a more efficient use of the U-70 accelerator in Protvino and provides crucial support for implementing crystal-assisted slow extraction and collimation in other machines, such as the Tevatron, RHIC, the AGS, the SNS, COSY, and the LHC.

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