[Jlab-seminars] Physics Seminar Announcement

[Luci Collins]

*Physics Seminar
Fri.,March 1**5, 2013
11:00 AM
CEBAF Center AUD.
Cookies and Coffee 10:45A*M

*"PERSPECTIVES OF IRON-FREE DETECTORS IN HIGH ENERGY PHYSICS"*
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Alexander Mikhailichenko
Cornell University*

         Longitudinal field at Interaction Point (IP) of any collider has a high field level required by proper identification of momenta of the secondary particles generated at IP. Typically the magnetic field created with the help of superconducting solenoid with induction of 3(GLD)-4T(LDC). Magnet yoke of detectors for colliders have tens of thousand tons of iron to re-direct the magnetic field flux from the one end of solenoid to the opposite one. From the other hand it is known, that the magnetic field value outside of the (long) solenoid is zero. Solenoids used (or suggested for use) have some remaining field outside, depending on the length/diameter ratio. In practice, the iron adds ~15% of the field value in realistic geometry only.  With invention of calorimeters which are able to determinate the type of particle (so-called dual readout calorimeters), identification of muons, carried usually with the help of back leg yoke iron, interlaced by muon identification system, is now transferred to the calorimeter itself.
    In this seminar we represent the basic principles of an iron-free detector. In such detector the magnetic flux is closed with the help of additional solenoid(s). Stray field outside detector has minimal level with implementation of end coils.  With elimination of iron yoke the detector becomes lightweight and easy accessible for further modifications. Engineering realization and some technologies associated with such detector, suggested for ILC (4-th Concept) described in detail.
      






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