Chicago ProjectsFacilities Simon Swordy University of Chicago 28

Chicago Projects/Facilities Simon Swordy - University of Chicago 28 th January 2009, PEBS meeting CERN

First measurement of positrons in cosmic rays (De. Shong, Hildebrand Meyer, 1964) Showed mostly secondary origin

(flew mid-1980 s)

HEAT - eplus/minus

HEAT eplus-minus 1994 (Collaboration of ~5 US institutions including Chicago, Michigan, Indiana, Wash U. UC Irvine)

HEAT pbar 140 Multi-wire Proportional Chambers measure energy loss to identify particle species. Superconducting Magnet Spectrometer with Drift Tube Hodoscope (continuous tracking) measures rigidity. This determines the particle’s charge sign and momentum. Time-of-Flight Scintillators trigger data acquisition, measure particle charge and determine direction of travel. 10 k. G field MDR extends to ~350 GV 65 m tracking accuracy 1 METER

Version for 1997 flight

Prep and Launch of 1997 version, note payload size relative to balloon

Heavy nucleus rings from 1991 flight - note this carbon here has total energy ~12*390 Ge. V = 4. 6 Te. V. Also note background is easily identifiable

TRACER – high energy composition

Chicago Electronics Shop Large experience in HEP detector systems (CDF, ATLAS, Double. Chooz…etc) New leader (as of early 2008); Jean-Francois Genat from Paris-6/Saclay Already working with DRS 4 switched capacitor chip Local balloon program engineer – Casey Smith

CREST Cosmic Ray Electron Synchrotron Telescope (reverse side)

Chicago High Bay CREAM-I TRD in transit in Chicago high bay