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Russian Counterpart of LHC — Accelerator Complex U 70 of IHEP

IHEP. LHC. 2010. INSTITUTE FOR HIGH ENERGY PHYSICS (IHEP) Protvino, Moscow Region, 142281, Russia. Russian Counterpart of LHC — Accelerator Complex U 70 of IHEP. S ergey I vanov. International WS FIRST RESULTS FROM THE LHC AND THEIR PHYSICAL INTERPRETATION October 19–21, 2010

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Russian Counterpart of LHC — Accelerator Complex U 70 of IHEP

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  1. IHEP LHC 2010 INSTITUTE FOR HIGH ENERGY PHYSICS (IHEP)Protvino, Moscow Region, 142281, Russia Russian Counterpart of LHC — Accelerator Complex U70 of IHEP Sergey Ivanov International WS FIRST RESULTS FROM THE LHC ANDTHEIR PHYSICAL INTERPRETATION October 19–21, 2010 Protvino, Russia

  2. Outlook • Generalities • Routine operation • Proton beam • Light-ion program • Further diversification options Project AC-IHB • Conclusion Int. WS IHEP LHC 2010

  3. Layout of accelerator complex U70 • 4 machines (since 10.2007): • 2 p-linacs • 2 p-synchrotrons main gate synchrotrons place of meeting linacs URAL30: 0.1-30 MeV, RFQ (2 MeV) + RFQ DTL I100: Alvarez DTL, 0.7—100 (72.7) MeV p; 16.7 MeV/u d, C (@ 4) Int. WS IHEP LHC 2010

  4. Photo album of machines Alvarez DTL I100 RFQ DTL URAL30 RC PS U1.5 Main PS U70 Int. WS IHEP LHC 2010

  5. Fixed-target physics and BTL network • Beams of • p, , K, e,  • Field of research: • h spectroscopy • spin physics • rare K-decays • h-A interactions • [ physics] • [light-ion physics] • … 90 m Collaborators: IHEP, ITEP, JINR, INR, St.-PNPI, MSU, MEPhI, CERN, FNAL, … Up to 9 HEP experiments per a run, up to 7 beam users per a cycle Int. WS IHEP LHC 2010

  6. Goals of activity • 4 goals: • Regular runs: stable operation and high p-beam availability • Improve p-beam quality (lower ε, higher N, up to 31013 ppp) • Implement a complementary light-ion program, q/A = 0.4–0.5 • Assess medium- and long-term diversification & development options to maintain and develop accelerator and experimental facilities on the IHEP grounds for applied and basic fixed-target research with hadron beams Int. WS IHEP LHC 2010

  7. Routine operation • Statistics: • twice a year • around a 1000 hr long run • 1 week long MD pre-session, 2-3 day mid-run MD, and EoR MD • 50 GeV (–20% in overall power consumption w.r. t. 70 GeV) • Beam availability 83–84% for experimental physics Run 2009/2, 3 hr or 1000 cycles SEB (in-out 90-95%) Int. WS IHEP LHC 2010

  8. Longitudinal feedbacks Accelerating system GRAPHITE, 40 ferrite-loaded 1-gap cavities, RF 5.52–6.06 MHz, 10 kV/gap 6 FB loops: Int. WS IHEP LHC 2010

  9. Beam quality, longitudinally DC CT PU Bunch length 12.2 ns Peak power 0.4–1 TW VRF peak D without 200 MHz spill cavity below tr @ 50 GeV Int. WS IHEP LHC 2010

  10. RF gymnastics 15.8 ns 5.0 ns Int. WS IHEP LHC 2010

  11. 35 kHz f0 Transverse (NB, local) feedback H: 14.7–72.3 kHz, 45 V: 29.4–43.2 kHz Damping factor = 100 w. r. t. natural Int. WS IHEP LHC 2010

  12. Transverse (WB) feedback natural, FB off sweep 100 ms linear FB Damping factor = 20 w. r. t. natural 100 ms Digital “bang-bang” FB Damping factor = 50 w. r. t. natural 8 ms Int. WS IHEP LHC 2010

  13. p-beam intensity Run 2009/1 U70 max-N mode 29 bunches, 11013 ppp Back to 200 MHz spill cavity U70: max 0.7–1.11013ppp, beam loss over acceleration 2–3% bunch 96 – 17 – 20 nsthrough cycle , Н size 9–11 mm (50 GeV, (flying-wire, SS103)) SSEtoBTL 21 (ОКА) 6–9.51012pper spill spill length 1.4–1.85 s U1.5 max 5.31011ppb Int. WS IHEP LHC 2010

  14. Extraction systems • Fast single-turn, 1–29 p-bunches, up to 1.1–1.21013p p p, about 90% efficiency • Slow resonant, up to 51011–11013p p p, spill to 2–3.5 s @ 50 GeV • Conventional, actuation via magnetic optics, lens Q38 • Stochastic, actuation via RF noise @ 200 MHz, since 2006 • Secondary particles from internal targets • Bent crystal (Si) deflectors, 1106–11012p p p,about 85% efficiency Int. WS IHEP LHC 2010

  15. 5 mm 5mm Bent-crystal deflectors Run2007: 3 CD(19, 24, 30) 6 experiments CD19 IT24 IT27 Beam to IHEP-CERN experiment on radiation sustainability of liquid Ar Int. WS IHEP LHC 2010

  16. Slow stochastic extraction CERN Courier vol 47 no 2 March 2007: 63% in 2.9 s.  = 0.40, duty factor Ф2/Ф2 = 0.87. No lines of mains harmonics 3rd integer horizontal resonance 3Qx = 29 200 MHz RF system Int. WS IHEP LHC 2010

  17. Slow extraction & OKA experiment Run 2009/1 Technological data from U70 Data from OKA facility counters Spill 1.85 s long 0.951013p per a spill 50 GeV Int. WS IHEP LHC 2010

  18. Light-ion program (1) Non-destructive w. r. t. p-mode Fully stripped (bare) ions, q = Z Charge-to-mass ratio q/A = 1/2 • Reference ions: • 1H1+ protons, p • 2H1+ deuterons, d • 12C6+ carbon Prospects of going to heavier ions will be assessed later with more experimental data at hands 50 000 23 600 Milestones are accomplished 9-12 mA 12C5+ Int. WS IHEP LHC 2010

  19. Light-ion program (2) I100-U1.5-U70: Huge scope of preliminary work -- DDS MO, technological feedbacks (gain 20 &SNR), beam diagnostics (DCCT), transfer synch, pilot low-intensity p-bunchwith N = 1010, RF system in U1.5 and U70, BTL I100/U1.5? SS#9 of U1.5, injection insert, etc April 27, 2010Deuteronswere accelerated 23.6 GeV/u in the U70 U70: from 41010to 2.51010dpb in-out transition crossing I100: 21 mA d pulsed 40 s91% in-out in BTL U1.5: from 1.41011to 8.61010dpb in-out Int. WS IHEP LHC 2010

  20. Project AC-IHB Accelerator Complex of Intense Hadron Beams • Maintain the entire U70 complex running • Local expertise- and site-specific • Multi-purpose and multi-user • Open to a long-term development • Advanced but proven technologies • Staging (#0, 1, 2, 3, and beyond) • Open to collaborative efforts to many national institutions Int. WS IHEP LHC 2010

  21. Layout of AC-IHB Int. WS IHEP LHC 2010

  22. Linac LU400 Conventional (non-SC) H minus Conventional macro-sectioning Funneling is an upgrade option Int. WS IHEP LHC 2010

  23. RC PS U1.5 (1) Super periodicity 6 No of FODO periods 36 Dipoles 24 Quads 72 (3 families) RF cavities ferrite loaded 36 20 kV @ 2.5 m Fast extraction 2 directions, identical Int. WS IHEP LHC 2010

  24. RC PS U1.5 (2) 1 envelope 4 margin FODO (90 deg) Missing dipoles QBA half-orbit dispersion-free WP (9.15, 7.20) Coulomb Q (-0.08,-0.15) Dipole 4 m, 0.95 T, gap 150 mm. Quad 0.6 m, < 5.6 T/m, radius 102.8 mm Chamber 126 mm  60 mm inner half-axes Int. WS IHEP LHC 2010

  25. Conclusion • Accelerator complex U70 of IHEP-Protvino: • comprises 4 machines (URAL30, I100, U1.5, and U70 proper), • readily ensures running the fixed-target physics program, • is subject to ongoing upgrade program, • has noticeably improved quality of proton beam, • is on a way towards routine acceleration of light-ions to 34 GeV per nucleon (now, U1.5 and U70  PS and LIS machine types) • a new project AC-IHB is developed, and other diversification options are being assessed Welcome to IHEP-Protvino, on behalf of our accelerator community Int. WS IHEP LHC 2010

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