Study of Prototype Straw Tube End-cap Technology

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The content describes the design and assembly of a 1-meter prototype for straw tube end-cap technology. Details include the structure of the detector layers forming coordinate systems, construction on a rigid flat table, stretching of straw tubes, effects of humidity on tube elongation, and the use of a special frame for stretching and compensating tension. The prototype aims to test assembly technology and can be utilized in various experiments. Deformation analysis of the frame post-stretching is within acceptable limits.

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SPD ST End-cap Straw Tubes end-cap Kekelidze G, Kramarenko V, Basharina K, 9/2/2024 Victor Kramarenko 1

Straw Tubes End-cap Principle design of ST end-cap The diameter of the tubes is 9.64mm The detector layers form four coordinate systems an X, Y, U, V at an angle of 45 degrees. Each coordinate plane has a diameter of 1600 mm and a thickness of 30 mm. Eight coordinate planes are mounted together on the rigid flat table, forming a rigid block, 300 mm thick. Each plane has a slot 135 mm wide for a beam pipe. X1 Eight coordinates straw layers straw planes Eight coordinates Y1 U1 V1 X2 Y2 U2 V2 Rigid flat table with bushings for end-cap mountiog (honeycomb) The rigid flat table will be removed after installation on the beam tube. 9/2/2024 Victor Kramarenko 2

1 meter Prototype Straw Tubes End-cap 1 meter Prototype The prototype is assembled on an ring aluminum frame. The slot for the vacuum beam pipe is not made. The prototype was made to test the assembly technology The detector does not have front-end electronics The prototype can be used in various experiments and in the test area 205. 9/2/2024 Victor Kramarenko 3

Straw 9.68 mm 0.9 Gravity sagitta the tubes 9,62 0.8 1100Gravity sagitta with stretching of 300 gr, 2.00 Gravity sagitta without prestressing, 0.7 1.80 Elongation, mm/m 0.6 1.60 1.40 0.5 1.20 0.4 1.00 0.3 0.80 0.2 0.60 0.40 0.1 0.20 0.0 0.00 0 100 200 300 400 500 600 500 700 Tube Length, 900 Tension, gramm It is known that twisted straw tubes change their sizes under the influence of atmospheric humidity The effect of humidity 0.8 0.7 The elongation value of the straw tubes was found to be 0.7 0.2 mm/m for a range of 50% - 80% changes in relative humidity. The measurements were made with copper-coated tubes with 6 mm and 10 mm diameters 0.6 Elongation, mm/m 0.5 0.4 0.3 The test showed that the elongation has a range of elastic deformation. Straw size is returned after drying. 0.2 0.1 On the figure shows the elongation of straw tubes depending on humidity. Victor Kramarenko 0.0 10 20 30 40 50 60 70 80 90 Humidity, % 9/2/2024 4

1 meter Prototype Straw Tubes End-cap Special technological frame for stretching straw arrays. Each straw needs to be stretched. It is necessary to compensate the effects of humidity and the tension of the signal wire. The technological frame must be stretched by about 3 mm. this will correspond to 400 grams of force for each straw. Straaw frame 135 1374 2 eters 1600 Tension frame 9/2/2024 Victor Kramarenko 5

1 meter Prototype Straw Tubes End-cap Deformation of the frame of the 1-meter prototype after stretching and gluing straw tubes into the frame. Minus 0.15 mm the deformation is within acceptable limits , does not exceed 0.15 mm Plus 0.15 mm 9/2/2024 Victor Kramarenko 6

1 meter Prototype Straw Tubes End-cap End plug 9/2/2024 Victor Kramarenko 7

1 meter Prototype Straw Tubes End-cap Straw tubes glued to the frame, before and after cutting 9/2/2024 Victor Kramarenko 8

Straw Tubes End-cap What needs to be done on a full-scale prototype and production of an End-cap 1 Full-scale frame. Development of sketches and models of the frame for the manufacture of a full-scale prototype made of carbon fiber or fiberglass 2. Mounting table. Development of design documentation and manufacture. 3. Contract. Conclusion of a contract for the manufacture of End-cap frames in ARTMASH, Belarus. Prior agreement has been obtained Conclusion of a contract for the manufacture of Endplugs in Vladimir UNIPLAST . Prior agreement has been obtained Development and production of a motherboard with amplifiers will be created by BELARUS for the ring configuration of the detector. 4. The general DAC system will be created and product by other specialists 5. Purchase of materials for the production of all elements of the End-cap - Kapton - Tungsten wire - Pins - Endplags - Adhesives. 9/2/2024 Victor Kramarenko 9