Advances in germanium detector technology for IWORID Amsterdam

Advances in germanium detector technology for IWORID Amsterdam, The Netherlands 08 -12 September 2002 Pat Sangsingkeow ORTEC

RESOLUTION 1. 17 Me. V 1. 33 Me. V Na. I(Tl) Ge 2

3

Reasons for abandoning in late 1970’s: • Difficult to work with. • Too small.

1980 2000 ORTEC 5

PLANAR STRUCTURE 70 mm X 130 mm 75 mm X 75 mm 25 mm X 25 mm ORTEC

mid 1990’s Photo courtesy of The Naval Research Laboratory

2000 8

NASA Standard Quartz Disc Parrafin Graphite Courtesy of Argonne National Laboratory 9

Courtesy of Argonne National Laboratory

2000 Closed-end Coaxial 1975 -2002 Early 1970’s ORTEC 6

Photo courtesy of UC Berkeley, Space Sciences Laboratory 12

HESSI High. Energy Solar Spectroscopic I mager Photo courtesy of NASA and HESSI Team 13

SEGMENTED COAXIAL The University of Liverpool ORTEC 14

INFORMATION FROM PULSE RISE TIME PHOTON FRONT CONTACT Front contact +V electron Back contact hole -V BACK CONTACT Courtesy of NRL & XIA 15

IMAGE CHARGES IN NEIGHBOR SEGMENTS PHOTON Neighbor-A Event Neighbor-B Segment +V FRONT CONTACT Shallow Interaction Deep Interaction -V BACK CONTACT Holes Electrons 17

INFORMATION FROM NEAR NEIGHBORS Neighbor-A segment Event segment Rear segment Shallow interaction Neighbor-B segment Event segment Rear channel Deep interaction 18

CONCLUSIONS: • Germanium is back into imaging !!! • Germanium has potential of achieving 10 times better position resolution than other current technologies. HPGe. DSSD Segmented Coax

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