We have developed the baseline design for the straw drift tube tracking detectors for high-rate environment application. The low-mass inner straw elements and the technology of the multianode straws assembly were devised and checked. The prototype chamber was constructed and studied. The granularity of similar chambers can be reduced to 1 cm 2 . §· ¡μÉ ´ ±μ´¸É·Ê±Í¨Ö É·¥±μ¢μ£μ ¤¥É¥±Éμ· ´ μ¸´μ¢¥ Éμ´±μ¸É¥´´ÒÌ ¤·¥°Ëμ¢ÒÌ É·Ê¡μ± (¸É·μÊ) ¤²Ö · ¡μÉÒ ¢ ʸ²μ¢¨ÖÌ ¢Ò¸μ±¨Ì § £·Ê §μ±. §· ¡μÉ ´Ò¨¨¸¸²¥¤μ¢ ´Ò ¢´ÊÉ·¥´´¨¥ Ô²¥³¥´ÉÒ É·μÊ, μ¡² ¤ ÕШ¥ ³ ²μ°³ ¸¸μ°. ' ±¦¥ · §· ¡μÉ ´ ɥ̴μ²μ£¨Ö¸¡μ·±¨³´μ£μ ´μ¤´Ò̸ɷμÊ. 'μ §¤ ´ ¨¨¸¸²¥¤μ¢ ´ ¶·μÉμɨ ¶´ ָɷμÊ-± ³¥· , ¶μ± § ´μ, ÎÉμ £· ´Ê²¨·μ¢ ´´μ¸ÉÓ É ±¨Ì ¤¥É¥±-Éμ·μ¢ ³μ¦¥É ¡ÒÉÓ Ê³¥´ÓÏ¥´ ¤μ 1¸³2 .
A class of models of dark sectors consider new very weak interaction between the ordinary and dark matter transmitted by U'(1) gauge bosons A' (dark photons) mixing with our photons. If such A's exist, they could be searched for in a light-shining-through-a-wall experiment with a high energy electron beam from the CERN SPS. The proposed search scheme suggests detection of the e+e-pairs produced in the A' -> e+e-decay with a very small opening angle. Coordinate chambers based on the thin-wall drift tubes with a minimal material budget and a two-hit resolution for e+ and e-tracks separated by more than 0.5 mm are considered as an option for detecting such pairs.
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