Straw Individual assembling device and the straw linearity preliminary measurements L.N.Glonti

THIS DEVICE ALLOWS THE STRAW TUBE ASSEMBLING WITH COAXIAL ENDS AND BUSHES AND MOVEBLE EDGE IN ORDINARY CONDITIONS OUTSIDE THE CHAMBER –

At we was presented about individual assembling straw tubes on the optical bench base which allows: At we was presented about individual assembling straw tubes on the optical bench base which allows: 1. The straws full assembly outside chamber on the usual working place. 2. To have one end of straws free and stretch them individually. 3. To use O-rings instead of glue, in accord Institution standard STP or GOST (ISO ???) 4. The use self centering hexagonal spacer allows strictly centering the straw in aluminum bush independently from spread in values 4. The use self centering hexagonal spacer allows strictly centering the straw in aluminum bush independently from spread in values of the straw Ø lie between ~±0.15 mm (the same also for the wires). 5. The straws and anode wires placement precision are depended practically from the chamber and end plugs prsicion produce only 5. The straws and anode wires placement precision are depended practically from the chamber and end plugs prsicion produce only but not assembling procedures accuracy.

The device for 2160 mm long straw individual assembly on the base of the 2000 mm long optical bench – was produced adjusted and full completed with accuracy of +/-20 microns (the collets for bushes and supports for straw).

L strawn = 2160 mm

Δ L straw = mm FROM + 1 atm.

Δ L straw = mm FROM 1500 g

/  All paths of assembling straw are made by accuracy of H8 (~0.010 mm) – the straw holes at the flanges, the outside bushes for ones, the self centered spacers and the insulators.  That is way we was obtained for finally accuracy of straw linearity about +/- 50 microns. +/- 50 microns.

Caliber measurement

Tungsten wire measurement

Straw sagita measurement

Tension 1500 g with fixed ends

Tension 1000 g and free end

750 g and free end

1000 g and free end

1000 g and free end (Top edge)

1000 g and free end (Bottom edge)

When we will finishing full assembling the straw at our device we will hope that this technology essentially increases reliability of the straw chamber, working in vacuum and decreases When we will finishing full assembling the straw at our device we will hope that this technology essentially increases reliability of the straw chamber, working in vacuum and decreases the assembling time and cost the assembling time and cost for the chambers mass-production.

  At using this technology the chamber it is possible assembled at horizontal position for example on the ATLAS round table without the complex high precision turn over tool. Hence the straws are at the spare condition and defects will be smaller.

  FINISH

 SATADARIGO