Libera BLD

Libera BLD is a compact, high-performance beam loss detector with multi-particle sensitivity and wide dynamic range. It works best when powered and controlled by Libera BLM, making it ideal for fast, precise diagnostics in demanding accelerator environments.

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Benefits:

  • Detection of a wide range of lost particles (Gamma, X-Ray, Neutrons)
  • Controlled and powered via  Libera BLM, providing real-time pulse sampling and loss evaluation using advanced processing algorithms
  • Compact and easy to install
  • Can be calibrated in-situ

How it works: 

Photons are generated when lost particles (gammas, X-rays, neutrons, etc.) pass through the scintillating material. The Photo-Multiplier Tube transforms the photons into electrical pulses and amplifies them. The readout electronics samples the electrical pulses and applies real-time processing algorithms that evaluate the loss and provide it to user in forms of numbers/counts and plots.

Example of a Libera BLD and Libera BLM set-up: 

Libera BLM provides the power and gain control voltage to up to 4 beam loss detectors via standard flat cable (6 wires). High voltage is generated inside the photo-multiplier tube (PMT). Output signal from the PMT to the Libera BLM is provided through a standard 50 Ohm coaxial cable.

Beam loss detector must be exposed to the electromagnetic shower. The scintillator is located in the upper part of the detector, about 11 cm from top. Orientation of the detector with reference to the vacuum chamber shall be decided after tests. Typically, it is positioned vertically  or horizontally and fitted to the vacuum chamber directly.

The Libera BLM is installed outside the tunnel. Cable lengths for the beam loss detectors can range up to 100 meters (tested).

Specifications of Libera BLD
Beam Loss Detector (BLD)
General product codeLBLD1.000.001LBLD1.000.002 / LBLD1.000.003LBLD1.000.004
Scintillator material Scintillating rodOptical fiberScintillating rod
Sensitivity to particlesElectrons, Protons, Neutron, Gamma, X-ray, Ionsdepends on usersSpecial for fast neutrons, nearly insensitive to gamma
Peak wavelenght of the scintillator 425 nmdepends on users450 nm
Peak wavelenght of the PMT400 nm400 nm400 nm
Rise time of the PMT 0,57 ns0,57 ns0,57 ns
Supply voltage5 V5 V5 V
Gain control voltage0 to 1 V0 to 1 V0 to 1 V
Outside dimensions (HxDxD) mmapprox. 220x25x25, without the fitting holderapprox. 106x25x25, without the fitting holderapprox. 220x25x25, without the fitting holder
Weight 210 g without the lead cover150 g without the lead cover180 g without the lead cover
Operating temperature+10°C to +40°C+10°C to +40°C+10°C to +40°C

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Commissioning of the Libera Beam Loss Monitoring system at SPEAR3*
Optimized Beam Loss Monitor System For The ESRF

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Libera BLD is used at the following labs:

  • ALS – Lawrence Berkeley National Laboratory (LBNL), USA

  • CHESS – Cornell University, USA

  • Diamond I – Diamond Light Source, United Kingdom

  • ESRF – The European Synchrotron Radiation Facility (ESRF), France

  • BESSY II – Helmholtz-Zentrum Berlin, Germany

  • HiSOR – Hiroshima Synchrotron Radiation Center, Japan

  • RAON – Institute for Basic Science (IBS), South Korea

  • CSR, HIRFL, ADS, BNCT, HEERF – Institute of Modern Physics Chinese Academy of Sciences (IMP-CAS), China

  • Jagiellonian Synchrotron – Jagiellonian University, Poland

  • SPring-8, SACLA – Japan Synchrotron Radiation Research Institute (JASRI), Japan

  • KAERI Facilities – Korea Atomic Energy Research Institute (KAERI), South Korea

  • ALS – Lawrence Berkeley National Laboratory (LBNL), USA

  • SLS, SwissFEL – Paul Scherrer Institute (PSI), Switzerland

  • PLS II, EUV – Pohang Accelerator Laboratory (PAL), South Korea

  • SESAME – The Synchrotron-light for Experimental Science and Applications in the Middle East (SESAME), Jordan

  • SSRF – Shanghai Synchrotron Radiation Facility (SINAP), China

  • SPEAR3 – Stanford Linear Accelerator Center (SLAC), USA

  • SLRI – Synchrotron Light Research Institute (SLRI), Thailand

  • Synchrotron SOLEIL – Synchrotron SOLEIL, France

  • COSY – Forschungszentrum Jülich GmbH, Germany

  • ANKA – Karlsruhe Institute of Technology (KIT), Germany

  • TPS – National Synchrotron Radiation Research Center (NSRRC), Taiwan

  • Cyclotron – ADAM SA / Advanced Oncotherapy PLC, Switzerland / United Kingdom

  • Australian Synchrotron – Australian Nuclear Science and Technology Organisation (ANSTO), Australia

  • C-ADS, CSNS – Institute of High Energy Physics (IHEP), China

  • MAX IV – MAX IV Laboratory, Sweden

  • HUST – Huazhong University of Science & Technology, China

  • SIGMAPHI Test Facilities – Sigmaphi Magnets and Beam Transport, France

  • Nucrad Research – Nucrad Technology Limited, United Kingdom

  • RI Test Facilities – RI Research Instruments GmbH, Germany

  • NUSANO Test Beam – NUSANO, USA

  • NSRL – National Synchrotron Radiation Laboratory (NSRL), China

  • LNL, Milano – Istituto Nazionale di Fisica Nucleare (INFN), Italy

  • MedAustron – MedAustron International GmbH, Austria

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