Scintillator wrappers

Tile Calorimeter

ATLAS Tile Calorimeter: Scintillating Tile Wrappers

Responsible institution: Michigan State University
Responsible person : R. Miller

The wrappers for the scintillating tiles are made from Tyvek material (Spunbonded Olefin) supplied by Dupont. This material has been selected for its light reflective properties, its mechanical toughness, its long life, and a surface texture that does not interfere with the internal reflection of light from the tile surface. The wrappers will be made in the form of sleeves, open at both ends where the WLS fiber are held in contact with the tile.

The Tyvek is obtained in rolls that are slit into widths slightly larger than the circumference of the tile. A mask, designed to improve the uniformity of the light yield from the tile, is printed in a repeating pattern on the Tyvek. The Tyvek is next formed into a continuous tube by welding the edges of the material, in a process developed by International Irrigation Inc. Finally, using the printed mask to define the lengths, the tube is cut into tile shaped pieces and holes for the source tubes are punched.

About 460000 sleeves of 11 different sizes will be produced for the Tilecal.

Sleeve Design (ps)
Printed Masks (GIF) June 10,98
Photo of Wrapper Testing (jpg)
Light Yield vs Wrapper Material (ps)
Tile-Sleeve Insertion Technique (ps)
Tyvek Quantity (ps)
Production and delivery schedule (ps)
Status of procurement and construction

Sleeve Specifications

Tyvek procurement Specifications, Mar. 26, 1998 (ps)

Tyvek Printing Specifications, June 23, 1998 (ps)

Sleeve Fabrication Specifications, July 17, 1998 (ps)

Bonding Machine

After the tile is inserted into the sleeve, the tile and sleeve are bonded at the center of one edge using an ultra-sonic bonding tool.

Ultra-sonic Bonding Machine specifications (jpg);

SonoBond : Page 1
SonoBond : Page 2

Machine setup for Tiles/Sleeves (jpg)

Transducer head (jpg)

Three tiles after bonding (jpg)

Drawing of Transducer Head (ps)

Scan of Tile Before and After Bonding (ps)

Sleeve Drawing in Various Formats: June 17, 1998

PostScript: Sleeves.ps

PICT: Sleeves.pict

Encapsulated PostScript: Sleeves.EPSF

TIFF: Sleeves.TIFF

GIF: Sleeves.GIF

Scans of 1998 Tiles (Tests of Wrapper Masking)

A set of 1998 production tiles were scanned with a source in steps of 1 cm lengthwise along the tile center line. The tiles were wrapped in sleeves with printed masks prepared for the module 0 tests in 1997. The resulting light was collected from both edges with WLS fibers routed to a PMT. The results of the scans are shown in the following figures.

Light Yield vs. Source Position (ps)
% Differences from Average Light Yield (ps)
Average and RMS Light Yield vs. Tile Size (ps)

XY Scans of 1998 Tiles (Tests of Wrapper Masking), June 5, 1998

The set of 1998 production tiles were scanned with a source in steps of 1 cm lengthwise along lines separated by 2cm. The setup and readout were the same as described above. The following figures show the light yield as a % of the maximum and the 10% contours for each size tile.

Tile Size 1 vs. Source Position (ps)
Tile Size 2 vs. Source Position (ps)
Tile Size 3 vs. Source Position (ps)
Tile Size 4 vs. Source Position (ps)
Tile Size 5 vs. Source Position (ps)
Tile Size 6 vs. Source Position (ps)
Tile Size 7 vs. Source Position (ps)
Tile Size 8 vs. Source Position (ps)
Tile Size 9 vs. Source Position (ps)
Tile Size 10 vs. Source Position (ps)
Tile Size 11 vs. Source Position (ps)

Slides Prepared for Scintillator PRR in Protvino, Apr. 21, 1998

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