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LEIR INSTRUMENTATION

LEIR INSTRUMENTATION. M. Chanel AB/ABP. GENERALITIES. I-LHC (main part LEIR) needed for the ions experiments in LHC. Most of instrumentation reshuffled from LEAR or with the experience of LEAR Instrumentation specified in collaboration with BD et BDI (regular meetings)

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LEIR INSTRUMENTATION

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  1. LEIR INSTRUMENTATION M. Chanel AB/ABP

  2. GENERALITIES • I-LHC (main part LEIR) needed for the ions experiments in LHC. • Most of instrumentation reshuffled from LEAR or with the experience of LEAR • Instrumentation specified in collaboration with BD et BDI (regular meetings) • LEAR should have a high priority (AB priority number 3 despite the fact that the instrumentation needed is standard!

  3. LEIR • Seehttp://chanel.home.cern.ch/chanel/Welcome.htm • Lead ions(Z=54,A=208), 109 ions total in 2 bunches, eh,v<0.7mm • Linac3 beam: 15..50mA, 150..500ms, debunched • Multiturn injection(6-D) at 1.13Tm, 4.2 MeV/n, b=0.0945, Trev=2.7ms, dp/p=4 10-3, eh~50...70, ev~30(pmmmrad) • Electron cooling tcool= 200…400ms and stacking (~sp~10-4, eh,v(1s)<5pmmmrad, coasting beam. • Recombinations • With residual gases : asked tlife~30s • With electrons of ecooling: tlife~10…20s (competition with good cooling time in the core) • Acceleration 1 or 2 bunches 1ms to 200ns • Fast Ejection at 4.8Tm,72 MeV/n, b=0.374, trev=700ns, 1 or 2 bunches ~200ns • N=109 ions, eh,v=0.7mm (early scheme 1 bunch 2.5 108 ions) • Machine and EI/EE baked to 300oC

  4. LEAD IONS in LEIR Combined H/V/P multiturn injection Coasting beam Bunched beam

  5. GENERAL LAYOUT

  6. INJECTION • Beam dimensions see DR; all EI is baked • Observation of position and shape based on Scintillator screens and camera • 1 ITE, 4 ETL, 2 EI Tanks and mouvements reshuffled • Scintillators to define as Al2O3+Cr203 screens die with ions. • Observation in CR, CCD if possible • Current transformers(slow) • 2 in ETL(same as for ejection), 1 in EI(all reshufled) • Resolution 1mA

  7. EXTRACTION • Beam dimensions see DR; all EE are baked • Observation of position by Electrostatic Pickups • 2 EE (baked), 4 ETL, 1 ETP,PU reshuffled (2 pairs are rebuilt-gone to AD) • Precision 1mm for 109 charges • Current transformers(fast) • 1 in EE(baked), 2 in ETL(same as for injection), 1 in ETP (all reshufled) • Précision 5% of 109 charges • Screens 1 EE(baked), 1 ETP reshuffled • Emittance measurements • 3 pairs of semwires in ETL

  8. MACHINE LEIR:Current meas. • Continuous current measurement • Imax 50 mA, Imin 10mA (2 108 charges at injection=1 turn injected) • Précision 1% , min 2mA • Nom. Pb : 3mA(inj), 10mA(ej.) • Analog + sampler 1ms, same DSC as scrapers • Old transfo reshuffled Semi-fast current meas. (multiturn injection) • See the accumulation in 50 to 100 turns (stairs) • 1% slope in 100 turns • At zero after 100 ms for the next injection(200ms) • Old transfo reshuffled • Analog and sampled

  9. MACHINE LEIR:orbit meas. • 16 pickups pairs (14 reshuffled, 2 new in ecool) • Meas during ramp every 10ms at max. • Meas. on flat bottom(concomitent with bunching) • Precision 1mm(2 108 charges),0.1mm(109 charges) • Polarisation (up to 50V) • Special measurement for electron beam of ecool (electron beam trajectory modulated at …kHz) • Analog by selection • High level soft. gives DB/B or Dp/p and orbit correction, dispersion….

  10. MACHINE LEIR:Tune meas. • Coasting beam • BTF: one resonant pickup +1 kicker +network analyser ( Very high sensitivity obtained in LEIR) • Schottky (see below) but for cooled beam no Transv. Schottky • Bunched beam (not completely defined) • Kick(fft) or BTF with pickup…every 10ms if possible • Otherwise kick+coupling+fft

  11. longitudinal Schottky Longitudinal Schottky spectrum at injection (blue) and 300 ms later (red).

  12. MACHINE LEIR: Schottky’s • Long. Distribution, transverse emittances, cooling times, coherent effects, pickups reshuffled • Low noise systems • b=0.95 (fixed by Linac3) BW~160MHz • H+M: 12 loop couplers in TWM by cable delays • V: 7 loop couplers in TWM by cable delays • other beta: summed, variable delays :H+M 12 loop couplers; V 8 Loop couplers; BW 400MHz at b=0.3 • Analysis by 3 spectra +FFT • Possibility to use these systems as broadband damper(later)

  13. Transverse Schottky (and BIPM) Horizontal cooling observed on the BIPM. Horizontal Schottky signal.

  14. MACHINE LEIR: WB Long. PU • A wideband pickup exist (300MHz)… • Analog signal on NAOS • Bunch analysis…tomoscope..

  15. MACHINE LEIR: Transverse profiles • BIPM (H,V) for emittance and T. cooling meas. • Measurement from (100,50)pmmmrad for a few109 charges every 20ms. • Note that the dynamic vacuum is in the 10-12 Torr(hope mainly H2) • Resolution as good as 0.5 mm(if possible) • Max dimension H~60mm, V~40mm • Save 100 profiles and online analysis. • H/V scrapers to mesure T amplitude dist. (reshuffled)

  16. MACHINE LEIR: others • Quadrupolar pickup (same as Q pickup?) used in conjonction with a Quad kicker to do BTFQ (used in MD’s to measure incoherent tune shift)-later- • Ions-electrons recombination in the next bending after ecool (scintillator +PM) • ( 4 collimators to capture recombined Pb53+ : same control as previous)

  17. CONCLUSION • The specifications are done in their generalities • The needed hardware in the machine is reshuffled or is being designed (soon for tune meas.). • Regular meetings take place to confront specifications and realities • Despite the « standard  » instrumentation needed, there are very intersesting specificities (injection, cooling, Schotky, BTF’s…)

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