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  • richardmitnick 9:56 am on May 28, 2018 Permalink | Reply
    Tags: CALICE collaboration, Calorimeter systems, Calorimeters measure the energy of passing particles from a collision, , Hadronic calorimeter, , , Testing calorimeters at CERN   

    From DESY: “Detector prototype sees beam” 

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    From DESY

    Optimised from top to bottom: new calorimeter produces good results in the test beam.

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    The calorimeter was assembled at DESY. Image: DESY

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    Test beam crew at CERN. Image: Jiri Kvasnicka, Prag

    Particle physics will always need calorimeters, so particle physicists are always trying to optimise, tweak and update their calorimeter systems for the best possible measurements. The CALICE collaboration plays a leading role in this, and their most recent prototype for a hadronic calorimeter has just been completed and is currently at CERN for a round of tests in the test beam.

    The project leaders are Katja Krüger and Felix Sefkow from DESY, who coordinated the development and production of all parts for the new prototype. They made sure it all came together in the detector lab at DESY and used the local expertise of many different groups to check that it worked wand set off with it to CERN. And it’s not only DESY electronics expertise that was involved: the calorimeter made the journey packaged in neat crates designed and custom-made by the DESY carpenters.

    The calorimeter prototype, whose role it is to measure the energy of passing particles from a collision, consists of 38 layers of 72 by 72 centimetres of active material. 22 000 scintillator tiles, each with its own silicon photomultiplier (SiPM), measure the passing particles, and in contrast to previous prototypes everything is included in the structure: photosensors, readout chips, LEDs for calibration, voltage adjustment, trigger, storage, amplifiers, energy and time digitisers, you name it. All of the data recorded by the detectors leaves the structure via one neat cable – just like it would have to if it were part of a complete high-energy physics particle detector where there’s no space for racks and lots of cables.

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    Representation of particles in the detector. No image credit.

    Coordinator Felix Sefkow explains what makes this calorimeter so special. “It’s got the 4D position information and timing of an imaging detector and it’s a calorimeter at the same time.” The new prototype is the culmination of years of developing and testing various technologies and combinations of technologies in labs and test beams to find the optimal system combinations and use the latest developments from semi-conductor industry. With its mature technology it could in principle be installed in a detector for the ILC tomorrow. So far things have gone well in the test beam that just finished after two weeks at CERN.

    Assembly of the detector had started in October last year with the participation of many groups around the world, using mass-production technologies. The scintillator tiles themselves were injection-moulded in Russia, automatically wrapped like candies in Hamburg and glued onto electronics boards by a robot in Mainz. The complex boards were assembled at DESY, using ASICs from the OMEGA group at Palaiseau, tested in Wuppertal, and SiPMs from Japan, characterised in Heidelberg.

    The DAQ was a common effort of Bristol, Prague and DESY physicists. Board production went on until January, after which they were calibrated, tested and integrated into the calorimeter structure at DESY. The Max-Planck-Group Munich contributed to mechanics and gave the software a strong boost. And before being packed up into boxes for the CERN beam time the setup already recorded its first cosmic muon events.

    Installation in CERN’s SPS beam line H2 went smoothly, the detector worked out of the box and recorded tens of millions of muon, electron and pion events. “Online data quality looks good”, summarises Krüger.

    The CALICE SiPM-on-Tile technology, developed under DESY lead, is so versatile that it will also be used in the LHC’s CMS detector for the high-luminosity upgrade and is under consideration for a future neutrino detector in the United States.

    See the full article here .


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    DESY is one of the world’s leading accelerator centres. Researchers use the large-scale facilities at DESY to explore the microcosm in all its variety – from the interactions of tiny elementary particles and the behaviour of new types of nanomaterials to biomolecular processes that are essential to life. The accelerators and detectors that DESY develops and builds are unique research tools. The facilities generate the world’s most intense X-ray light, accelerate particles to record energies and open completely new windows onto the universe. 
That makes DESY not only a magnet for more than 3000 guest researchers from over 40 countries every year, but also a coveted partner for national and international cooperations. Committed young researchers find an exciting interdisciplinary setting at DESY. The research centre offers specialized training for a large number of professions. DESY cooperates with industry and business to promote new technologies that will benefit society and encourage innovations. This also benefits the metropolitan regions of the two DESY locations, Hamburg and Zeuthen near Berlin.

     
  • richardmitnick 12:51 pm on July 7, 2016 Permalink | Reply
    Tags: , , , , , Testing calorimeters at CERN   

    From ILC: “Practi-Cal” 

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    Linear Collider Collaboration

    7 July 2016
    No writer credit found

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    Testing, testing… calorimeters in the test beam at CERN.

    Better together: two technological prototypes of the high-granularity calorimeters for a future ILC detector have been tested together with particle beams at CERN in a combined mode. The Semi-Digital Hadronic CALorimeter (SDHCAL) prototype with its 48 layers and the Silicon Electromagnetic CALorimeter (SiECAL) with its 10 units, both part of the CALICE collaboration, spent two weeks taking data on the “H2” beam line at CERN’s SPS. The principal goal of this beam test was to validate their combined data acquisition (DAQ) system developed by the teams working on the two calorimeters. After the fixing of a few problems that appeared during the data taking, the DAQ system ran smoothly and both prototypes took common data. This is what they will have to do in the future to register electron-positron collisions at the ILC.

    Physicists and engineers from six countries participated in this beam test: Belgium, China, France, Japan, Korea and Spain. Future tests will focus on studying the common response of these two calorimeters to the different kinds of particles. “The success of this combined test will certainly encourage other detectors proposed for the tracking system (Silicon and TPC detectors) to join the adventure…,” Imad Laktineh, professor at IN2P3’s Institut de Physique Nucléaire de Lyon,who supervised the combined beam test, hopes.

    More about calorimeter test beams here and here.

    See the full article here .

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    The Linear Collider Collaboration is an organisation that brings the two most likely candidates, the Compact Linear Collider Study (CLIC) and the International Liner Collider (ILC), together under one roof. Headed by former LHC Project Manager Lyn Evans, it strives to coordinate the research and development work that is being done for accelerators and detectors around the world and to take the project linear collider to the next step: a decision that it will be built, and where.

    Some 2000 scientists – particle physicists, accelerator physicists, engineers – are involved in the ILC or in CLIC, and often in both projects. They work on state-of-the-art detector technologies, new acceleration techniques, the civil engineering aspect of building a straight tunnel of at least 30 kilometres in length, a reliable cost estimate and many more aspects that projects of this scale require. The Linear Collider Collaboration ensures that synergies between the two friendly competitors are used to the maximum.

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