1/34 Status of the Nuclotron-NICA project Nearest Plans. G.Trubnikov Sarantsev seminar, September 17, 2011 Alushta, Ukraine

ЛФВЭЛФВЭЛФВЭЛФВЭ ЛФВЭЛФВЭЛФВЭЛФВЭ ОИЯИОИЯИОИЯИОИЯИ ОИЯИОИЯИОИЯИОИЯИ Вид на площадку с вертолета Синхрофазотрон Нуклотрон ( сверхпроводящий синхротрон ) Нуклотрон ( сверхпроводящий синхротрон ) Схема комплекса НИКА

Предложена в рамках « Дорожной Карты » научных исследований ОИЯИ Основные области : Релятивистская физика тяжелых ионов : поиск и изучение фазовых переходов и новых состояний ядерной материи, включая смешанную фазу и критическую точку ; Спиновая физика малонуклонных систем : изучение спин - зависимых процессов ; Физика ароматов : проверка правила OZI, поиск многокварковых состояний ( пентакварки ) поиск и изучение экзотических ядер ( гиперядра ); Инновационные проекты : медицинские пучки, биология. Научная программа на ускорительном комплексе физики высоких энергий ОИЯИ 3/34

Ускорительный комплекс ЛФВЭ SPI – d­ EBIS – N, Ar, Fe, Kr, Xe, … Laser – Li, B, C, F, Mg, … Duoplasmotron – p, d, a, 3He SPI – d­ EBIS – N, Ar, Fe, Kr, Xe, … Laser – Li, B, C, F, Mg, … Duoplasmotron – p, d, a, 3He 4/34

1 этап : Нуклотрон - М Руководители : Г. В. Трубников, А. Д. Коваленко, Требуемые НИРиОКР – приоритет при проведении сеансов Этот этап д. б. завершен в 2010 демонстрацией : - Ускорение тяжелых ионов с A ~ 100 ÷ 200 -интенсивность ~ 107 A/ имп -Энергия пучка > 3,5 ГэВ / н -Развитая инфраструктура Цель– достичь в 2010 году параметров Нуклотрона, необходимых для реализации проекта НИКА за счет: Модернизации инжекционного комплекса (нет АСУ и диагностики, потери k=3) Модернизации ВЧ системы (нестабильность, нет диагностики, 0.6 Т/с) Обновление диагностики и систем управления (на уровне середины 90-х) Модернизации вакуумной системы (10е-7 Торр) Реконструкции систем питания и криогенного обеспечения (2 нет АСУ) Развития необходимой инженерной инфраструктуры (уровень конца 80-х годов) Тема /2010 5/34 Слайд с заседания УС 2008 г.

Estimation of the average vaccum in the Nuclotron ring measuring circulating deutron beam lifetime at Е=5 MeV/u corresponds to the vacuum pressure not worse than 4* Тоrr. (it means that since 2007 we improved vacuum by >2 orders) Estimation of the average vaccum in the Nuclotron ring measuring circulating deutron beam lifetime at Е=5 MeV/u corresponds to the vacuum pressure not worse than 4* Тоrr. (it means that since 2007 we improved vacuum by >2 orders) Magnetic field, T Beam intensity, particles 6/34 Nuclotron-M Results

7/34 Automatic beam orbit correction system (kit of 28 correctors) Nuclotron Run February - 22 March 2011 MCP detector for residual gas ions registration Beam profile evolution at acceleration (transverse and longitudinal)

8 New digital system for on-line beam orbit measurment Nuclotron Run February - 22 March 2011 Beam signal amplitude evolution from pick-ups (Acceleration. Field rising from 300 to 1000 Gs) 8/34

4.5÷ 5·10 10 (d) at 300 MeV/u For the first time at Nuclotron had been performed beam slow extraction at 3,1 GeV/u 9/34 Nuclotron-M Results

10/34 10 First 6 turns (about 50 s), deutron beam after orbit correction. Blue - injected beam, Red - signal from pick-up. Circulating beam signals during 1150 ms. Small increasing of the signal amplitude is connected to beam de-bunching Nuclotron-M Results

Сеана 41, март 2010 Пучок Xe (A=124, Z=42+) был ускорен до 570 МэВ / н и 1 ГэВ / н, и успешно выведен для физиков. Изображение выведенного пучка Xe ( Е = 0,6 ГэВ / н ) на фотопластине Сигнал ускоренного пучка Xe с датчика низкоинтенсивного циркулирующего пучка След от пучка Xe (1 ГэВ / н ) в фотоэмульсии ( эксперимент Беккерель ) Kr, Xe впервые получены на источнике Результаты модернизации КРИОН, ЛУ -20, ВЧ систем, вакуума 11/34 Результаты: Нуклотрон - М

Полномасштабная реконструкция системы питания всего ускорительного комплекса 12/34 Результаты: Нуклотрон - М I_max = 6kA B_max = 20 kGs dB/B = 0.1Gs df/f (RF) = 1e-5

13/34 Результаты: Нуклотрон - М

14/34 Nuclotron-NICA foreinjector Cascade transformer up to 0,7 MeV p,d laser ESIS d Recent: Maximum HILAC energy is reduced from 6.2 MeV/u to ~ 3 MeV/u Доклад К.Левтерова

9/36 Injection complex Heavy Ion Linear Accelerator Design at IHEP (Protvino) and JINR m ~0.85 m Fabrication and test assembling at VNIIEF (Sarov) Presently in there – technology analysis and cost estimate Recent: Maximum HILAC energy is reduced from 6.2 MeV/u to ~ 3 MeV/u

16/36 Heavy Ion Source KRION-6T Nuclotron-NICA Assembling of electron/ion optics system: view from the ion extraction side. Superconducting test coil (L=19 cm, 32 layers of SC wire) : preparation for testing in a liquid helium. Magnetic field (T) versus current (A) for SC solenoids; experimental and expected data. 1) 26 layers (green line, 21 Jan.11) – 7.41T at I_crit.=131 A (experimental data); 2) 32 layers (top green line, 25 Apr.11) – 7.81T at I_crit=114 A (experimental data); 3) red line: critical current for SC wire according its manufacturer data; 4) blue line: expected for Krion-6T ESIS – 22 layers, L=120 cm, B=6 T at I_working=118 A. Should be ready in September 2011.

11/36 Source of polarized particles (p, d, H) JINR+INR RAS Nuclotron-NICA We plan to assemble and TEST SPP at Nuclotron with d in the end of 2012 V.Fimushkin

Booster synchrotron 18/36

19 NICA Project Concept & Status SC Booster-Synchrotron Booster scheme Booster Parameters Particles ions A/Z 3 Injection energy, MeV/u3 Maximum energy, GeV/u 0.6 Magnetic rigidity, T·m Circumference, m211.2 Fold symmetry4 Quadrupole periodicity24 Betatron tune5.8/5.85 Design and construction of the Booster RF System is under development at Budker INP (G.Kurkin and team)

20 NICA Project Concept & Status SC Synchrotron Nuclotron ParameterProject Status (April 2011) Max. magn. field, T2.05 Magn. rigidity, T m45 Cycle duration, s B-field ramp, T/s Accelerated particlesp–U, p, d p-Xe, d Max. energy, GeV/u 12.6(p), 5.87(d) 4.5( 197 Au 79+ ) 3.5 (d), 1.5 ( 124 Xe 42+ ) Intensity, ions/cycle 1E11(p,d), 1E9 (A > 100) 5E10 (p,d), 1E10 (d ) 1E5 ( 124 Xe 24+ ) 20/34

SC experiment at Nuclotron 21/34 Circumference, m251.5 Ionsup to A=56 Energy, GeV3.5 Rev.frequency, MHz1.2 Vacuum, Torr10^-10 Intensity10^11(p)-10^9(C12) Ring slippage factor0,0322 dp/p10^-3

Simulations of stochastic cooling 22/34 Expected evolution of particle distribution function and rms value of dP/P for protons. Expected evolution of particle distribution function and rms value of dP/P for carbon ions (C6+) Доклад Н.Шурхно

23/34 Nuclotron-NICA Stochastic cooling system prototype at Nuclotron Vacuum chamber for kicker Vacuum chamber for pick-up Slot-coupler structures, manufactured at IKP FZJ Slot-coupler structures, manufactured at IKP FZJ We plan to assemble and TEST stochastic cooling system prototype at Nuclotron in the end of 2011 (depends on electronics delivery)

Stochastic cooling 24/34 Total and partial slip-factors of the ring as the function of ion energy. At such position of the kicker the condition gives for the acceptable upper frequency of the band the value of about 20 GHz (at the momentum spread equal to the ring dynamic aperture ±0.01). The luminosity of cm 2 s 1 corresponds to about ions per bunch, the effective ion number is about To provide required cooling time the cooling bandwidth can be chosen from 3 to 6 GHz W = 3-6 GHz Kicker - 48 meters upstream the IP-point PU meters upstream the Kicker Slice overlapping (by D.Moehl) 3..6GHz: Tsc~0,5Tibs 2..4 GHz: Tsc~Tibs

Electron cooling 25/34 Dependence of the cooling times for transverse and longitudinal degrees of freedom Recombination supression: a) Increasing T_tr_e b) Shift of electron energy Conclusions: T_ecool ~ 0,05 Tibs at 1 GeV/u Electron transverse temperature [eV] required to obtain ion life-time = 10 hours. T_tr_e = 1 eV

26/34 IBS DR SC DR Summary final

27/34 Magnets for the Booster: Prototype dipole magnet had been manufactured and successfully tested in May of this year. The first results of the tests had been obtained. The iron yoke of model quadrupole lens had been manufactured. Completion of the lense is planned for August Multipole corrector magnet, a cryostat for the lense and the corrector are under construction. Completion of their construction is planned for November Cryogenic tests of the tandem lense + corrector in the common cryostat is scheduled for the end of this year. Development of the first stage of the system for magnetic measurements scheduled for the end of this year. Collider Magnets: The iron yoke for model dipole magnet had been manufactured. Two coils and cryostat for magnet must be completed in June. Cryogenic test is planned for August - September Manufacturing of the iron yoke for model quadrupole lense and tooling for its coil winding had been started. Status of NICA SC magnets

28/34 Installation of the cryostat with the magnet on the bench for the cryogenic test. Cryogenic test facility for superconducting magnets AC losses as a function of the field ramp rate at magnet operation in triangular cycle The quench history of the magnet First test results for booster dipole Доклад Г.Кузнецова

29/34 The first quench was occurred at 7705 A. After 13 th quench current reach nominal value 9690 A. This corresponds to the magnetic field induction in the gap of 1.8 T. Further training was stopped because of the limitation of the power supply. The measured static (at zero current) heat flow to the magnet was 5.8 W. AC losses of 12 W were determined by the calorimetric method during magnet operation at triangular cycle with field ramp rate 1.2 T/s without pause. This value agrees well with the calculation and confirms the correct grade of steel for the magnet yoke. Hydraulic resistance of the cooling channel was 2 times higher calculated value due to the fact that the inner tube diameter was 2.6 mm instead of 3 mm. First test results for booster dipole Доклад Г.Кузнецова

30/34 Finished yoke of the quadrupole magnet Booster quadrupole magnet manufacturing

31/34 Test on vacuum tightness of the tubes for cooling the yoke Manufacturing of the winding (0,9 mm wires) Collider dipole magnet manufacturing

32/34 Important: - dedicated test bench for injection system (inflector plates) into Booster is in operation; - dedicated prototype of HV platform for Ion sources (PS 225kV/3A) is under assembly; - new system of the whole complex synchronization is under design and construction; - new thermometry and quench detection system for Nuclotron is in progress; - development of electron cooling system for booster is in active phase (could be designed and constructed at BINP). HV electron cooling system for collider is under design with All-Russian Electrotechnical Inst + FZJ + BINP; - … PLANS: Next run at Nuclotron with prolonged period (~1,5 months) is planned for November-December 2011 and beam will be delivered mainly for physicists. Nuclotron-NICA

частицы Интенсивности, частиц/имп ЭнергияGSI (SIS18) Nuclotron-M (2010) Ожидается на Nuclotron-N (2012) Ожидается с новым ионным источником и бустером ( ) p 4,5 GeV d 2,2 GeV He d (SPI) 7 Li C MeV Mg MeV Ar MeV Fe Ni MeV Kr 34+ 0,3 -1 GeV Xe 48/42+ 0,3 -1 GeV Ta GeV Au 65/ U 28+/73+ 0,05-1 GeV /

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