Общемосковский семинар по релятивистской ядерной физике Институт Ядерных Исследований РАН

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Общемосковский семинар по релятивистской ядерной физике Институт Ядерных Исследований РАН 27 марта 2008 года Концептуальный Проект Ускорительного Комплекса NICA ОИЯИ N uclotron-based I on C ollider f A cility. И.Н.Мешков (от имени Группы NICA ОИЯИ). - PowerPoint PPT Presentation

Text of Общемосковский семинар по релятивистской ядерной...

  • Project leaders: A. Sissakian, A. Sorin

    Accelerator group leaders: I. Meshkov, A. Kovalenko

    JINRN.Agapov, V.Alexandrov, A.Alfeev, O.Brovko, A.Butenko, B.Vasilishin, V.Volkov, E.D.Donets, E.E.Donets, A.Eliseev, I.Issinsky, G.Khodzhibagiyan, V.Karpinsky, V.Kobets, O.Kozlov, A.Kuznetsov, V.Mikhaylov, V.Monchinsky, A.Sidorin, G.Sidorov, V.Shevtsov, A.A.Smirnov, A.V.Smirnov, V.Toneev, G.Trubnikov, V.Zhabitsky.

    IHEPO.Belyaev, Yu.Budanov, I.Zvonarev, A.Maltsev

    INRV.Matveev, L.Kravchuck

    Editors:I.Meshkov A.Sidorin

  • :1. 2. 3. 4. 5. -6. 7. 8. 9. NICA

  • 1. : - 238U92+, p, d. . , 45. , / : 12.6 238U92+: 4.36 "" : 238U92+ , / 1.0 3.5 , -2-1 6.61025 1.11027

  • Existing beam lines(solid target exp-s) 205

  • 2. ()Booster (30 Tm)2(3?) single-turn injections, storage of 3.2109,acceleration up to 50 MeV/u,electron cooling,acceleration up to 400 MeV/uNuclotron (45 Tm)injection of one bunch of 1.1109 ions,acceleration up to 3.5 GeV/u max.Collider (45 Tm)Storage of 15 bunches 1109 ions per ring at 3.5 GeV/u,electron and/or stochastic cooling Injector: 2109 ions/pulse of 238U32+ at energy 6 MeV/uIP-1IP-2Stripping (40%) 238U32+ 238U92+Two superconductingcollider rings215 injection cycles

  • 30 injection cycles of 1109 ions 238U92+ per cycle2 cyclesof injection,electroncooling (?)electroncooling238U32+stripping to238U92+2 x 1.51010 ions of 238U92+

  • 1) : nbunch & Nbuch 2) * "hour-glass effect" minimum lbunch &

  • 3. () 1) : nbunch & Nbuch

    nbunch limitation: "electron cloud" effect, multibunch beam instability, technical parameters of the injection system. Nbunch limitation: Laslett tune shift, Beam-beam effect, Coherent instabilities

  • 3. () 3) = min3.1. = min Nbunch? lbunch? nbunch?

  • 3. () 3) = min3.2. = (t)Intrabeam scattering (IBS) Emittances x,y(t) dp(t)/p L(t)IBS ~ 50 s storage a cooling is required!

  • 3. () Colliding beams parameters

    "" , :

    1. Circumference, m2252. *, m0.53. p/p (one )110-34. Bunch length (), m0.35. Beam emittance (), mmmrad0.266. Bunch intensity(1-2)1097. Bunch number per ring158. Average luminosity for UxU, 3.5 GeV/u, cm-2s-11.11027

  • B [T] Ions Nion/pulse-2 3.0 Au30+ 5108 exp-6 6.0 Au32+ 2109 scaled B2

    Normalized emittance 0.2 mmmrad (BNL)

  • 5. -Booster layout

  • 5. - () :"" ? (V.Mikhailov)Electric parameters

    Red hard for realization, green easily to realise, blue - conventional

    ParameterWarm magnetsSC magnets

    Power consumption, MW2.00.3Peak power12.0 MW(active + reactive)1.8 MVA(reactive)Maximum voltage, kV4.00.3Maximum current, kA3.04.0

  • Mechanical parametersParameterWarm magnetsSC magnetsDipole weight, t3.01.5Dipole cross-section, m20.73 x 0.4Vacuum conditionsDesorption coefficient,molecules/ion104 105 102 104 Residual gasH2, COH2

  • 5. - ()

    Main Booster parametersIons238U32+Circumference, m216Injection/extraction energy, MeV/u6.2/400Magnetic rigidity, Tm2.4/25.0Transition energy, MeV/u3.9Maximum dipole field, T1.8Cycle repetition period, s4.0Vacuum, Torr10-11

  • Main E-cooler parameters Electron energy, keV55 (35?) Ion energy, MeV/u100.0 E-beam current, A1.0 Overall length, m4.0 Cool. section length, m2.5 Solenoid B-field, kG1.5 B-field inhomogeinity110-4 Te / Te||, meV200/0.5

  • ProblemComments 1. SC magnetic system novel, there is prototype 2. Injection scheme rather conventional 3. Space charge at injection rather conventional 4. Beam collimation, desorption, vacuum, etc. novel, no real experience 5. Acceleration conventional 6. electron cooling rather conventional 7. Fast extraction rather conventional 8., Many others rather conventional

  • 6.

    ParameterProject Status (March 2008)1. Circumference, m251.52. Maximum B-field, T2.051.53. Max. magn. rigidity, Tm45334. Cycle duration, s2.05.05. B-field ramp, T/s2.01.06. Accelerated particlespU, p, dp-Fe, d7. Max. energy, GeV/u12.6(p), 4.36( 238U92+)4.1(d), [3.0( 238U92+)]6. Intensity, ions/cycle11011(p), 1109(A/Z = 2) 11011(p),1106(Fe24+) 2108(d)

  • 6. () 2010 . , NICA: A~200, ~ 109 A/, 0.2-0.4 ~ 3.5 / U92+

    RF ,

    - -

    (-)

  • 6. () (-)

  • 6. () - !RF phase and (later) amplitude jumps bunch overturn in phase space (A.Eliseev)Bunch length (phase length)E

  • 6. ()

  • 6. () -6 . . : , ,-, .- (2007-2010): : 2387 k$ + : 3165 k$

  • 7.

    1. Circumference, m2252. Colliding particlesp U, p, d3. Number of interaction points24. Maximum B-field, T5.0 (4.0)5. Max. magn. rigidity, Tm45 (37.5)6. Bunch number per ring157. Bunch intensity(1-2)1098. (x / y)* , m0.5 / 0.59. (Dx, / Dy)* , m0 / 08. Average luminosity for UxU, 3.5 GeV/u, cm-2s-11.11027

  • 7. ()

  • 7. () Bunch number limitation by technical parameters of the injection system(A.B.Kuznetsov)lbunch 0.5(kicker + jitter)ckicker 300 ns nbunch 15

  • 7. () Single bunch parameters limitation

  • Three prototypes

    Main E-cooler parameters Max.electron energy, MeV2.4 E-beam current, A1.0 Cool. section length, m6.0 SC solenoid B-field, T2.0 B-field inhomogeinity210-5 Te / Te||50 eV / 5 meV

  • 7. () Stochastic coolingW band width of the feed backM the mixing factor Hopeless!

  • 7. () Stochastic cooling (contnd)S-cooling with shifted PU electrodes [T.Katayama, I.Meshkov, D.Moehl] It makes sufficient a conventional S-cooling system of 5 GHz band width

  • 8.

  • 8. ()8.1. :3 , 1) ..,2) NICA: ,., ., ., ., ., ., ., 3) ..

  • 8. ()8.1. () : (1 .- = 1 k$), , .8.2. : (paper work), ( ),, - ,- .

  • 8. ()8.1. () : (1 .- = 1 k$), , .8.2. : (paper work), ( ),, - ,- .

  • 8. ()8.3. ,: 1. 1. 2. 2. 3. - 4. 5. - - 1. 6. 2. 7.

  • 8. ()8.4. (US k$)

  • I - (2008-2010) , R&D II (2008-2012)

    III , (2010-2012)

    IV , (2013-2014)9. NICA /MPD

  • 10. NICANICA

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