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n STORM Beam Instrumentation First ideas

n STORM Beam Instrumentation First ideas. Lars Søby on behalf of the CERN Beam Instrumentation Group. Overview. Specifications and beam parameters Beam observables: Intensity Beam position Beam profile Tune Beam loss Energy Summery. Beam parameters.

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n STORM Beam Instrumentation First ideas

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  1. nSTORM Beam InstrumentationFirst ideas Lars Søby on behalf of the CERN Beam Instrumentation Group

  2. Overview • Specifications and beam parameters • Beam observables: • Intensity • Beam position • Beam profile • Tune • Beam loss • Energy • Summery Lars Søby nuSTORM 26-03-2013

  3. Beam parameters Continuous multi turn (~9 turns) injection. No RF Injecting on top of circulation bunches NOT foreseen yet, i.e. 200MHz plus any frequency above is possible. Structure in beam unknown for the moment Lars Søby nuSTORM 26-03-2013

  4. What is asked for More complete specifications are needed  • Turn by turn measurements are requested • 1us time resolution? or synchronized to revolution frequency? Lars Søby nuSTORM 26-03-2013

  5. Intensity measurements • L4 Beam Current Transformer L4 16mA, 400us FIRST BEAM LEIR Semi-fast BCT [100us/div] Lars Søby nuSTORM 26-03-2013

  6. Beam position measurements Possible beam spectra Button Pick-ups • Simple design  • Cheapest solution  • Big buttons needed  f 400MHz ~1MHz 200MHz • Bunch length 4ns (4) • Bunch intensity 5E8 • BW=200MHz • Button diameter 10cm 50uV/mm LHC buttons D=25mm Single turn resolution ~10mm with S/N=10 Cost ~10-15kCHF…depending on quantity Lars Søby nuSTORM 26-03-2013

  7. Beam position measurements Possible beam spectra Inductive BPM • Sensitive , captures all image current • Less sensitive to beam loss  • Intensity measurement  • Big ceramics, costly  f 400MHz ~1MHz 200MHz Iaverage=50mA N=25 BW=200MHz Electrodes Current transformers Single turn resolution ~1.5mm with S/N=10 Cost ~35kCHF…depending on quantity Ceramic chamber Lars Søby nuSTORM 26-03-2013

  8. Profile measurements • Only non destructive device is the Ionization Profile Monitor (IPM) but not enough • time / intensity to ionize gas and obtain a profile. • Other detectors based on ionization (MWPC, IC, GEM) are destructive (and complicated) • No synchrotron light • Wire scanners too slow • SEM strips and Scintillation screens are options A large FIXED scintillating screen for the LHC dump line Al2O3..CRO2 screen Standard CERN MTV system but In/out mechanism has to be added. Cost ~50kCHF Lars Søby nuSTORM 26-03-2013

  9. Profile measurements Power full in/out mechanism needed! Resolutions of 1 cm is possible SEM strips L~10cm 60cm Lars Søby nuSTORM 26-03-2013

  10. Tune measurements • Will use existing BPM(s) • Based on known BBQ technique • Required resolution? : Determines number of PU’s needed. • Excitation probably not needed (injection coherent oscillations) ADC + FFT Betatron oscillations Cost ~10kCHF Lars Søby nuSTORM 26-03-2013

  11. Ionization Chamber and Secondary Emission Monitor Secondary Emission monitor Ionization Chamber • Stainless steal cylinder • Parallel electrodes distance 0.5 cm • Diameter 8.9 cm • Voltage 1.5 kV • Low pass filter at the HV input Diamond pCVD+sCVD • IC: Total losses at aperture restrictions • Al electrodes • Length 60 cm • Ion collection time 85 us • N2 gas filling at 1.1 bar • Sensitive volume 1.5 l • Sensitivity 54 uC/Gy • Dynamic range 9 orders of magnitude • CVD: Fast losses at injection • Poly or Single Crystal chemical Vapor Deposition diamonds • Signal amplitude comparable to 1.5 litre ionisation chamber • Radiation tolerant amplifier near to detector • Response time below 1 ns Slide by Bernd Dehning Sensitive to charges particles: Electrons, muons, pions… Cost ~5-8kCHF Lars Søby nuSTORM 26-03-2013

  12. Energy and polarization measurements • Energy: • Magnetic spectrometers measure the particle momentum by precisely determining the angle of deflection in a dipole magnet. • Use Scintillating screens / SEM-grids in arcs combined with collimator (well known position), well known magnet fields (spectrometer magnet) and beam optics: • Polarization measurement: • The precession of the spin associated with each muon in a magnetic field is governed by the Thomas-BMT equation. At every turn this precession is given by the spin tune which is a function of the muonenergy. • No experience in the CERN BE/BI group. Pol. MUON POLARIMETER IN A NEUTRINO FACTORY DECAY RING M. Apollonio∗, Imperial College, London, UK, D. J. Kelliher, ASTeC, STFC Rutherford Appleton Laboratory, UK A. Blondel, DPNC, Universite´ de Gene`ve, CH WEPE053, Proceedings of IPAC’10, Kyoto, Japan 50 turns Lars Søby nuSTORM 26-03-2013

  13. BI proposals Lars Søby nuSTORM 26-03-2013

  14. Summery • More precise specifications are needed to refine instrument choices. • Structured beam is a plus for BI, and knowledge about bunch lengths, injection scheme and intensities is needed. • Turn clock timing signal, for synchronized measurements ? • Big is expensive: Ceramics, screens, in-out… Lars Søby nuSTORM 26-03-2013

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