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Title: Performance of the Integrated Tracker Towers of the GLAST Large Area Telescope

Abstract

The GLAST Large Area Telescope (LAT) is a high energy gamma ray observatory, mounted on a satellite that will be own in 2007. The LAT tracker consists of an array of tower modules, equipped with planes of silicon strip detectors (SSDs) interleaved with tungsten converter layers. Photon detection is based on the pair conversion process; silicon strip detectors will reconstruct tracks of electrons and positrons. The instrument is actually being assembled. The first towers have been already tested and integrated at Stanford Linear Accelerator Center (SLAC). An overview of the integration stages of the main components of the tracker and a description of the pre-launch tests will be given. Experimental results on the performance of the tracker towers will be also discussed.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
899576
Report Number(s):
SLAC-PUB-12356
TRN: US200709%%178
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Prepared for 9th ICATPP Conference on Astroparticle, Particle, Space Physics, Detectors and Medical Physics Applications, Villa Erba, Como, Italy, 17-21 Oct 2005
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; DETECTION; ELECTRONS; INTERNAL PAIR PRODUCTION; PERFORMANCE; PHOTONS; PHYSICS; POSITRONS; SATELLITES; SILICON; STANFORD LINEAR ACCELERATOR CENTER; TELESCOPES; TUNGSTEN; Instrumentation,INST

Citation Formats

Brigida, M., Caliandro, A., Favuzzi, C., Fusco, P., Gargano, F., Giglietto, N., Giordano, F., Loparco, F., Marangelli, B., Mazziotta, M.N., Mirizzi, N., Raino, S., Spinelli, P., and /Bari U. /INFN, Bari. Performance of the Integrated Tracker Towers of the GLAST Large Area Telescope. United States: N. p., 2007. Web.
Brigida, M., Caliandro, A., Favuzzi, C., Fusco, P., Gargano, F., Giglietto, N., Giordano, F., Loparco, F., Marangelli, B., Mazziotta, M.N., Mirizzi, N., Raino, S., Spinelli, P., & /Bari U. /INFN, Bari. Performance of the Integrated Tracker Towers of the GLAST Large Area Telescope. United States.
Brigida, M., Caliandro, A., Favuzzi, C., Fusco, P., Gargano, F., Giglietto, N., Giordano, F., Loparco, F., Marangelli, B., Mazziotta, M.N., Mirizzi, N., Raino, S., Spinelli, P., and /Bari U. /INFN, Bari. Thu . "Performance of the Integrated Tracker Towers of the GLAST Large Area Telescope". United States. doi:. https://www.osti.gov/servlets/purl/899576.
@article{osti_899576,
title = {Performance of the Integrated Tracker Towers of the GLAST Large Area Telescope},
author = {Brigida, M. and Caliandro, A. and Favuzzi, C. and Fusco, P. and Gargano, F. and Giglietto, N. and Giordano, F. and Loparco, F. and Marangelli, B. and Mazziotta, M.N. and Mirizzi, N. and Raino, S. and Spinelli, P. and /Bari U. /INFN, Bari},
abstractNote = {The GLAST Large Area Telescope (LAT) is a high energy gamma ray observatory, mounted on a satellite that will be own in 2007. The LAT tracker consists of an array of tower modules, equipped with planes of silicon strip detectors (SSDs) interleaved with tungsten converter layers. Photon detection is based on the pair conversion process; silicon strip detectors will reconstruct tracks of electrons and positrons. The instrument is actually being assembled. The first towers have been already tested and integrated at Stanford Linear Accelerator Center (SLAC). An overview of the integration stages of the main components of the tracker and a description of the pre-launch tests will be given. Experimental results on the performance of the tracker towers will be also discussed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Feb 15 00:00:00 EST 2007},
month = {Thu Feb 15 00:00:00 EST 2007}
}

Conference:
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  • The GLAST Large Area Telescope (LAT) is a satellite gamma-ray observatory designed to explore the sky in the energy range 20MeV {approx_equal} 300GeV, a region populated by emissions from the most energetic and mysterious objects in the cosmos, like black holes, AGNs, supernovae, gamma-ray bursters. The silicon-strip tracker is the heart of the photon detection system, and with its 80 m{sup 2} of surface and almost 1M channels is one of the largest silicon tracker ever built. Its construction, to be completed by 2006, and the stringent requirements from operation in space, represent a major technological challenge. Critical design, technologymore » and system engineering issues are addressed in this paper, as well as the approach being followed during construction, test and qualification of the LAT silicon tracker.« less
  • The Large Area Telescope (LAT) is one of two instruments on board the Gamma-ray Large Area Telescope (GLAST), the next generation high energy gamma-ray space telescope. The LAT contains sixteen identical towers in a four-by-four grid. Each tower contains a silicon-strip tracker and a CsI calorimeter that together will give the incident direction and energy of the pair-converting photon in the energy range 20 MeV - 300 GeV. In addition, the instrument is covered by a finely segmented Anti-Coincidence Detector (ACD) to reject charged particle background. Altogether, the LAT contains more than 864k channels in the trackers, 1536 CsI crystalsmore » and 97 ACD plastic scintillator tiles and ribbons. Here we detail some of the strategies and methods for how we are planning to monitor the instrument performance on orbit. It builds on the extensive experience gained from Integration & Test and Commissioning of the instrument on ground.« less
  • The Anti-Coincidence Detector (ACD), the outermost detector layer in the Gamma-ray Large Area Space Telescope (GLAST) Large Area Telescope (LAT), is designed to detect and veto incident cosmic ray charged particles, which outnumber cosmic gamma rays by 3-4 orders of magnitude. The challenge in ACD design is that it must have high (0.9997) detection efficiency for singly-charged relativistic particles, but must also have a low probability for self-veto of high-energy gammas by backsplash radiation from interactions in the LAT calorimeter. Simulations and tests demonstrate that the ACD meets its design requirements. The performance of the ACD has remained stable throughmore » stand-alone environmental testing, shipment across the U.S., installation onto the LAT, shipment back across the U.S., LAT environmental testing, and shipment to Arizona. As part of the fully-assembled GLAST observatory, the ACD is being readied for final testing before launch.« less
  • The silicon tracker for the engineering model of the GLAST Large Area Telescope(LAT) has at least two unique features: it employs self triggering readout electronics, dissipating less than 200 mu-W per channel and to date represents the largest surface of silicon microstrip detectors assembled in a tracker (2.7 m{sup 2}). It demonstrates the feasibility of employing this technology for satellite based experiments, in which low power consumption, large effective areas and high reliability are required. This note describes the construction of this silicon tracker, which was installed in a beam test of positrons, hadrons and tagged photons at SLAC inmore » December of 1999 and January of 2000.« less
  • The silicon tracker for the engineering model of the GLAST Large Area Telescope(LAT) to date represents the largest surface of silicon microstrip detectors assembled in a tracker (2.7 m{sup 2}). It demonstrates the feasibility of employing this technology for satellite based experiments, in which large effective areas and high reliability are required. This note gives an overview of the assembly of this silicon tracker and discusses in detail studies performed to track quality assurance: leakage current, mechanical alignment and production yields.