straw tube material

[Beni Zihlmann <zihlmann@jlab.org>]

Hi All,
I compiled a list of experiments using straw tubes.
For some I found rather good detailed information others only marginal.
All I found is listed for the different experiments.

cheers,
Beni

-- 
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Benedikt Zihlmann
TJNAF
HallD 12C/ F350
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tel: 757 269 5310 
fax: 757 269 6331                zihlmann@jlab.org
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STRAW TUBES IN OTHER EXPERIMENTS
----------------------------------

PANDA/COSY
----------
These two experiments use the same type of straws.
Manufacturer: LAMINA Dielectric LTD. England
Tube material: aluminized mylar 30 micro meter thick no additional information other then
               reference to WASA-CELSIUS experiment.

OD = 10.06mm
ID = 10.00mm
Wall thickness 30 micro meter
length 1500mm and 1050mm respectively
Tube material: Aluminized Mylar but not further specified.
Operation: The tubes are operated in vacuum at overpressure of 2atm in Panda
           and at 1.25bar in COSY. diameter incrawse is 50 micro meter at 
           2 atm. 
Gas: Ar + 10% CO2
Wire: 20 micro meter thick



ATLAS
-----
Detector transition radiation tracker: TRT
straw tube: 25micro meter Kapton with 0.2micro meter Aluminum deposited
            on top of that 5-6 micro meter graphyte polimer layer (55% Carbon)
            glue two of these tapes togehter on a mandril. The strips have
            10mm width and glued togeter on the Kapton side with polyurethan
            on each tape with about 4-5 micro meter thickness. This glue is
            a heatcuring sealant. The mandril was heated to about 260 degree C.
            -> total straw wall thickness is about 70 micro meter. with two
               Aluminum layers one on the inside and one on the outside that are
               protected by the graphite polymere.

            these tube were manufactured by LAMINA Dielectric LTD. in England.
            at CERN a carbon fiber was glued on the outside to provide more stability

Tube length: 1600mm
Tube diameter: 4mm

wire diameter: 30 micro meter
wire material: gold plated tungsten



COMPASS
---------
Tube material: 40 micro meter Kapton 160XC 370 from Dupont USA
               glue to it 12 micro meter Aluminized Kapton (500Angstrom Al)
               the glueing is done on a mandril by 
               LAMINA Dielectric LTD in England.
               glue is not specified some indications that it is the same as for the 
               Atlas tubes.

Note: the term Kapton XC refers to resisitve Kapton where carbon is "loaded" into the Kapton.
      in this way the capton is slightly conductive with a high resistance.
      This material was also used in test for straws for the SSC.      

Note: some prototypes for Compass were also built with the same straw material as Atlas uses in the TRT
      and results were reported in 1999.

Tube OD: 6.144mm and 9.654mm
Tube length: 3202mm, 1523mm, 3652mm and 1752mm
wire OD: 30 micro meter



WASA-CELSIUS at GSI
--------------------
only comment found: 30 micro meter aluminized mylar.	




FINUDA at Daphne
----------------
Straw tube material: 12 micro meter mylar aluminized 0.1 micro meter thick aluminum) is wrapped
                     on a mandrel and a second 12 micro meter mylar stip (not aluminized) is 
                     glued on top. with polyester based epoxy. the overall thickness is 
                     30 micro meter +/- 10 micro meter 

straw length: 2550mmm
innter diameter: 15mm

wire: gold plated tungsten 30 micro meter diameter



MECO at BNL
-------------
Straw tube material: carbon filled polyimide. this is a seamless tube. carbon is mixed into the plastic
                     at the time of producing the tube (I guess injection molding

Note: this is a high resistive tube 6 Mohm/?


straw length: 350mm
straw diameter: 5mm
wall thickness 25 micro meter