Space flight experience with the AMS infrared tracker alignment system (TAS)

Details Space flight experience with the AMS infrared tracker alignment system (TAS) Space flight experience with the AMS infrared tracker alignment system (TAS)

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....6.2197v&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

The large acceptance Antimatter Spectrometer (AMS) experiment (Becker, 1999) has been flown successfully on the STS91 (02-June-98 12-June-98) shuttle flight. AMS-01 particle tracking is based on 6 planes of double sided Si detectors in a permanent magnetic field. The position stability of the tracking elements has been con-trolled using infrared laser generated and cosmic straight tracks. Over the whole flight -including lift-off and landingall tracking elements were found at their expected positions within ±15 µm. 1 Intoduction AMS-01 high accuracy momentum measurement is based on 6 (2+1)D high precision position determinations of charged particle tracks through a 1m3 magnetic field (|B| ≈ 1.2kG) volume. A particle track of 10 GeV has a 0.5 mm sagitta. 2D particle position information is derived from double sided Silicon strip detectors arranged in "ladders" of up to 65cm of length (fig. 1) tiling the 6 detector planes. The main component of the magnetic field runs parallel to the "y-strips" on the junction side of the Si detectors. From the electrical signals on the implantations (pitch ˜y/˜x 27.5/52 µm) the sagitta can be measured to about 25 µm precision (Alcaraz et al. 1999). The third dimension is derived from metrology during the assembly of the tracker plates (˜z ≈ 50 µm). Taking multiple scattering into account the AMS-01 tracker has about 10% momentum resolution at 10 GeV allowing for a maximum detectable momentum (MDM) of 500 GeV. It is evident that a precise momentum measurement is only possible if the detector positions perpendicular to the magnetic field vector (y-axis) are known at all times with an accuracy of better than a small fraction of the to be measured sagitta. 2 Tracker alignment Straight tracks measured with the Si sensors themselves are most appropriate for an alignment check of these sensors on the 6 detector planes. In the following a subset of AMS-01 Si ladders are aligned using both artificial straight tracks produced by laser (λ = 1082 nm) beams (fig. 1) and quasi straight tracks of high rigidity (p > 4 GV) particles (fig. 2). J. Vandenhirtz1, W. Wallraff1, M. Weisgerber1 1RWTH-Aachen, 1.Physikalisches Institut

Affiliated with

Also associated with

No associations

Rating

Space flight experience with the AMS infrared tracker alignment system (TAS) does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Space flight experience with the AMS infrared tracker alignment system (TAS), we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Space flight experience with the AMS infrared tracker alignment system (TAS) will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-794517