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CNGS Proton Beam Line Instrumentation

CNGS Proton Beam Line Instrumentation. OUTLINE BPM System Update - Requirements - Acquisition system BCT System Update - Requirements - Acquisition system For other systems see NBI2002 talk by R. Jung. Original. 18 Button Electrode BPMs in TT41 60mm Aperture.

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CNGS Proton Beam Line Instrumentation

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  1. CNGS Proton Beam Line Instrumentation OUTLINE • BPM System Update - Requirements - Acquisition system • BCT System Update - Requirements - Acquisition system For other systems see NBI2002 talk by R. Jung NBI2003 - Rh. Jones (CERN - AB/BDI)

  2. Original 18 Button Electrode BPMs in TT41 60mm Aperture 4 Stripline Couplers in TT40 will see both LHC & CNGS beams Modified CNGS Beam Position Monitoring CNGS Beam Position Measurement Requirements Intensity Range: 11012 to 3.51013 NBI2003 - Rh. Jones (CERN - AB/BDI)

  3. CNGS Beam Position Monitoring CNGS Beam Position Measurement Acquisition System • Each signal is compressed by alogarithmic amplifier, filtered and applied to a differential amplifier. • The position response is:Pos  [log(A/B)] = [log(A)-log(B)]  (Vout)where Vout is the voltage difference between the log-amp outputs NBI2003 - Rh. Jones (CERN - AB/BDI)

  4. Logarithmic Amplifiers 2 in parallel per electrode to improve linearity 200MHz BP filters • 1 cable transmits: • H position • V position • Intensity CNGS Beam Position Monitoring CNGS Beam Position Measurement Acquisition System NBI2003 - Rh. Jones (CERN - AB/BDI)

  5. CNGS Beam Position Monitoring CNGS Beam Position Measurement Acquisition System Why this choice?  low cost – as it requires only 1 coax cable per pick-up.  large dynamic range without requiring gain switching.  simple engineering  autotrigger capability Potential Problems:  linearity with position • log amp has inherent non-linearity in the % of aperture range • hopefully improved using a compensation log amp in parallel •  radiation issues with digital electronics in the tunnel • Experience gained from testing LHC components • Attempt to use radiation tolerant components NBI2003 - Rh. Jones (CERN - AB/BDI)

  6. First BCT sees both LHC & CNGS beams • Has to fulfill additional requirement of LHC bunch by bunch capability (i.e. 25ns resolution) CNGS Beam Current Monitoring CNGS Beam Current Monitoring Requirements Two Monitors – one at the beginning & one at the end of the line Absolute Accuracy of 1% for the Intensity Range: 11012 to 3.51013 New development for LHC - Fast BCT (BFCT) • 500MHz Bandwidth • Not required for CNGS • Low droop (~0.1%/ms) • 1% effect for CNGS NBI2003 - Rh. Jones (CERN - AB/BDI)

  7. CNGS Beam Current Monitoring CNGS Beam Current Measurement Acquisition System Analogue Acquisition based on a fast integrator chip • Designed by the Laboratoire de Physique Corpusculaire, Clermont-Ferrand for use in the LHCb Preshower Detector.(Large Hadron Collider beauty experiment for precise measurements of CP violation and rare decays) • Uses interleaved, 20MHz integrators and sample & hold circuitry to give 40MHz data (only total sum required for CNGS) NBI2003 - Rh. Jones (CERN - AB/BDI)

  8. CNGS Beam Current Monitoring CNGS Beam Current Measurement Calibration Fast BCT fitted with calibration winding. Switched current source injects 128mA for 5ms • equivalent to 21010 charges in 25ns • same signal level as a CNGS train of 8.41012 protons Comparison between DCCT and BFCT in the SPS Shaded region represent 2% NBI2003 - Rh. Jones (CERN - AB/BDI)

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