1 / 8

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.

erikb
Télécharger la présentation

CNGS Proton Beam Line Instrumentation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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)

More Related