PEBS-2 superconducting magnet version
Mechanical drawing of the PEBS-2
To extend the scientific reach of the PEBS program we ultimately plan to install a superconducting magnet at the heart of the detector system. There already exists a design study for this magnet performed in Germany, and a scheme is developed to provide >40 days cryogen hold time in the system on a balloon flight. A central scientific impact of this device will be to enable the measurement of electrons and positrons up to 1800GeV, when combined with an appropriate tracker. The central tracker will be a silicon strip device, similar to that used in the CMS detector at CERN, with a 25μm strip pitch. This will be provided by the same groups in Europe that supplied devices for CMS. In combination with large area fiber hodoscopes on a long lever arm this will provide an excellent spectrometer with high resolution. A key new area of science that this magnet will also enable is the capability to measure antiprotons and 3He/4He in the ~100GeV region in combination with newly developed gas and aerogel RICH counters based on SiPM detectors. Fortunately the flexibility of the balloon program allows us to expand the capabilities of the instrument step-by-step in repeated balloon flights.