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Title: T-1018 UCLA Spacordion Tungsten Powder Calorimeter

Abstract

The present experiments at the BNL-RHIC facility are evolving towards physics goals which require the detection of medium energy electromagnetic particles (photons, electrons, neutral pions, eta mesons, etc.), especially at forward angles. New detectors will place increasing demands on energy resolution, hadron rejection and two-photon resolution and will require large area, high performance electromagnetic calorimeters in a variety of geometries. In the immediate future, either RHIC or JLAB will propose a facility upgrade (Electron-Ion Collider, or EIC) with physics goals such as electron-heavy ion collisions (or p-A collisions) with a wide range of calorimeter requirements. An R and D program based at Brookhaven National Laboratory has awarded the group funding of approximately $110,000 to develop new types of calorimeters for EIC experiments. The UCLA group is developing a method to manufacture very flexible and cost-effective, yet high quality calorimeters based on scintillating fibers and tungsten powder. The design and features of the calorimeter can be briefly stated as follows: an arbitrarily large number of small diameter fibers (< 0.5 mm) are assembled as a matrix and held rigidly in place by a set of precision screens inside an empty container. The container is then back-filled with tungsten powder, compacted onmore » a vibrating table and infused with epoxy under vacuum. The container is then removed. The resulting sub-modules are extremely uniform and achieve roughly the density of pure Lead. The sub-modules are stacked together to achieve a final detector of the desired shape. There is no dead space between sub-modules and the fibers can be in an accordion geometry bent to prevent 'channeling' of the particles due to accidental alignment of their track with the module axis. This technology has the advantage of being modular and inexpensive to the point where the construction work may be divided among groups the size of typical university physics departments. This test run if a proof-of-principle and allows the experiment to improve the design and performance of the final detectors. The experimenters have constructed prototypes of three different designs in order to investigate the characteristics of practical devices such as uniformity, linearity, longitudinal and transverse shower shapes. The first design is an array of 4 x 4 modules intended as a prototype for a practical device to be installed within two years in the STAR experimental hall. The modules are a combination of a spaghetti calorimeter and an accordion (hence 'spacordion'). Each sub-module is 1.44 cm x 1.44 cm x 15 cm and constructed individually. The second design is a prototype of 4 sub-modules constructed in one step, using a different construction technique. The third design is a set of single sub-modules each intended to test variations of the tungsten powder/embedded fiber concept by enhancing the light output/density using liquid scintillator or heavy liquids.« less

Authors:
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Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1032887
Report Number(s):
FERMILAB-PROPOSAL-1018
TRN: US1200277
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ALIGNMENT; CALORIMETERS; CONSTRUCTION; CONTAINERS; DESIGN; DETECTION; ELECTRONS; ENERGY RESOLUTION; ETA MESONS; FIBERS; HADRONS; ION COLLISIONS; LIQUID SCINTILLATORS; PHOTONS; PIONS; RESOLUTION; TUNGSTEN; Instrumentation

Citation Formats

Trentalange, Stephen, Tsai, Oleg, Igo, George, Huang, Huan, Pan, Yu Xi, Dunkelberger, Jay, Xu, Wen Qin, /UCLA, Soha, Aria, /Fermilab, Heppelmann, Steven, /Penn State U., Gagliardi, Carl, and /Texas A-M. T-1018 UCLA Spacordion Tungsten Powder Calorimeter. United States: N. p., 2011. Web. doi:10.2172/1032887.
Trentalange, Stephen, Tsai, Oleg, Igo, George, Huang, Huan, Pan, Yu Xi, Dunkelberger, Jay, Xu, Wen Qin, /UCLA, Soha, Aria, /Fermilab, Heppelmann, Steven, /Penn State U., Gagliardi, Carl, & /Texas A-M. T-1018 UCLA Spacordion Tungsten Powder Calorimeter. United States. doi:10.2172/1032887.
Trentalange, Stephen, Tsai, Oleg, Igo, George, Huang, Huan, Pan, Yu Xi, Dunkelberger, Jay, Xu, Wen Qin, /UCLA, Soha, Aria, /Fermilab, Heppelmann, Steven, /Penn State U., Gagliardi, Carl, and /Texas A-M. Wed . "T-1018 UCLA Spacordion Tungsten Powder Calorimeter". United States. doi:10.2172/1032887. https://www.osti.gov/servlets/purl/1032887.
@article{osti_1032887,
title = {T-1018 UCLA Spacordion Tungsten Powder Calorimeter},
author = {Trentalange, Stephen and Tsai, Oleg and Igo, George and Huang, Huan and Pan, Yu Xi and Dunkelberger, Jay and Xu, Wen Qin and /UCLA and Soha, Aria and /Fermilab and Heppelmann, Steven and /Penn State U. and Gagliardi, Carl and /Texas A-M},
abstractNote = {The present experiments at the BNL-RHIC facility are evolving towards physics goals which require the detection of medium energy electromagnetic particles (photons, electrons, neutral pions, eta mesons, etc.), especially at forward angles. New detectors will place increasing demands on energy resolution, hadron rejection and two-photon resolution and will require large area, high performance electromagnetic calorimeters in a variety of geometries. In the immediate future, either RHIC or JLAB will propose a facility upgrade (Electron-Ion Collider, or EIC) with physics goals such as electron-heavy ion collisions (or p-A collisions) with a wide range of calorimeter requirements. An R and D program based at Brookhaven National Laboratory has awarded the group funding of approximately $110,000 to develop new types of calorimeters for EIC experiments. The UCLA group is developing a method to manufacture very flexible and cost-effective, yet high quality calorimeters based on scintillating fibers and tungsten powder. The design and features of the calorimeter can be briefly stated as follows: an arbitrarily large number of small diameter fibers (< 0.5 mm) are assembled as a matrix and held rigidly in place by a set of precision screens inside an empty container. The container is then back-filled with tungsten powder, compacted on a vibrating table and infused with epoxy under vacuum. The container is then removed. The resulting sub-modules are extremely uniform and achieve roughly the density of pure Lead. The sub-modules are stacked together to achieve a final detector of the desired shape. There is no dead space between sub-modules and the fibers can be in an accordion geometry bent to prevent 'channeling' of the particles due to accidental alignment of their track with the module axis. This technology has the advantage of being modular and inexpensive to the point where the construction work may be divided among groups the size of typical university physics departments. This test run if a proof-of-principle and allows the experiment to improve the design and performance of the final detectors. The experimenters have constructed prototypes of three different designs in order to investigate the characteristics of practical devices such as uniformity, linearity, longitudinal and transverse shower shapes. The first design is an array of 4 x 4 modules intended as a prototype for a practical device to be installed within two years in the STAR experimental hall. The modules are a combination of a spaghetti calorimeter and an accordion (hence 'spacordion'). Each sub-module is 1.44 cm x 1.44 cm x 15 cm and constructed individually. The second design is a prototype of 4 sub-modules constructed in one step, using a different construction technique. The third design is a set of single sub-modules each intended to test variations of the tungsten powder/embedded fiber concept by enhancing the light output/density using liquid scintillator or heavy liquids.},
doi = {10.2172/1032887},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Nov 16 00:00:00 EST 2011},
month = {Wed Nov 16 00:00:00 EST 2011}
}

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