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Calorimeter Research and Development

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About

This program examines a novel approach to achieving superior hadronic energy resolution which is  based on a homogeneous hadronic calorimetry (HHCAL) detector concept, including both electromagnetic and hadronic parts, with separate readout of the Cherenkov and scintillation light and using their correlation to obtain superior hadronic energy resolution.



Overview


Total absorption shower counters made of inorganic crystal scintillators have been known for decades for their superb energy resolution and detection efficiency. In high energy and nuclear physics, crystal electromagnetic calorimeters (ECAL) have been constructed for precision measurement of photons and electrons. Because of their good energy and position resolutions and excellent identification and reconstruction efficiencies for electrons and photons, their use has been a key factor in the successful physics programs of many experiments. The physics discovery potential of a crystal ECAL was demonstrated early on by the Crystal Ball experiment through its study of radiative transitions and decays of the Charmonium family. One of the physics challenges for new detectors is to distinguish W and Z vector bosons in their hadronic decay mode. This requires a di-jet mass resolution of the order of the natural width of these bosons and hence a jet energy resolution of about 3%. For hadron calorimetry this means an energy resolution a factor of two better than previously achieved to date by any large-scale experiment. A novel approach to achieving superior hadronic energy resolution is based on a homogeneous hadronic calorimetry (HHCAL) detector concept, including both electromagnetic and hadronic parts, with separate readout of the Cherenkov and scintillation light and using their correlation to obtain superior hadronic energy resolution. This HHCAL detector concept has a total absorption nature, so its energy resolution is not limited by the sampling fluctuations. It has no traditional boundary between the ECAL and HCAL, so it does not suffer from the effects of dead material in the middle of hadronic showers. With the dual-readout approach, measuring both Cherenkov and scintillator light, large fluctuations in the determination of the electromagnetic fraction of a hadronic shower can be vastly reduced. The missing nuclear binding energy can then be corrected shower-by-shower, resulting in good energy resolution for hadronic jets. Active materials, such as scintillating crystals, glasses or ceramics, may be used to construct an HHCAL.



Contact


Erik Ramberg
  • Adam Para
  • Coordinator
  • Office: (630) 840-2132
  • Cell: xxx.xxx.xxx
  • email: para@fnal.gov


Join the Community


Interested parties are invited to join the 'lcrandd@fnal.gov' email list. This email list is used to inform parties interested in calorimeter research. Notices of upcoming meetings, talks, and conferences will be sent out to this list. In addition, periodic summaries of the work being done at Fermilab will be sent.

To subscribe to this list, send an email message to the address listserv@fnal.gov, with the following line in the body of the message:
subscribe lcrandd Firstname Lastname
with your own name substituted where indicated. You should receive a notice back indicating you have joined the list, and a second notice with a brief welcome message.

If you have any questions, feel free to contact Hans Wenzel.