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X-ray Survey of the ATLAS SCT Hardware Overview Nick Brett and Jim Loken 15-06-05.

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Presentation on theme: "X-ray Survey of the ATLAS SCT Hardware Overview Nick Brett and Jim Loken 15-06-05."— Presentation transcript:

1 X-ray Survey of the ATLAS SCT Hardware Overview Nick Brett and Jim Loken

2 Nick Brett – University of Oxford 2 The ATLAS Semi-Conductor Tracker

3 Nick Brett – University of Oxford 3 Alignment Requirements  Alignment should not degrade track parameter measurements by more than 20%  Mis-alignment of SCT must fall within the following tolerances SCT Forward SCT Barrel Rø(μm)Z(μm)R(μm)

4 Nick Brett – University of Oxford 4 Alignment Techniques  Initial X-Ray Survey  Frequency Scanning Interferometry  Track-Based Alignment Procedures

5 Nick Brett – University of Oxford 5 Aims of The X-Ray Survey  Produce a map of the SCT modules  Calibrate the FSI system  Module positions can be inferred from shape of support structure  Compliment Track Alignment  Provides an initial geometry  Identify otherwise unrecoverable distortions

6 Nick Brett – University of Oxford 6 X-ray Survey Overview

7 Nick Brett – University of Oxford 7 The Scanning Head Optical strip reader Linear Motion BM250 Rotary Motion ADR200 X-Ray Assembly

8 Nick Brett – University of Oxford 8 Linear Motion  8 pole induction motor  25:1 ratio gear box  Rubber Wheel Linear Motion BM250 Scanning Head BM250 motor Gear Box Rubber Wheel Rail

9 Nick Brett – University of Oxford 9 Optical Strip Reader  1.6m Long Scale Strip  RGH25 Read Head  RGB25 Signal Processor  Maximum Spatial resolution of 5μm Resolution 5μm Signal Period 20μm RGH25 Read Head

10 Nick Brett – University of Oxford 10 R Measurement  Ø and Z fixed by scanning head  R found through use of stereo angle between X-Ray tubes Scanning head in calibration stand SCT barrelX-ray beam

11 Nick Brett – University of Oxford 11 X-rays on silicon Problems low Interaction probability digital readout Solutions Use long integration window (x-ray mode) Multiple triggers for each beam position strip position (Rø) hits

12 Nick Brett – University of Oxford 12 Module response narrow beam wide beam strip position (Rø) hits Problem  Non-uniform response to x-rays Solution  Use wide beam to measure response  Modulate narrow beam accordingly

13 Nick Brett – University of Oxford 13 Calibration X-Ray Beam Optical Table SCT Module (In transport case) Z Axis

14 Nick Brett – University of Oxford 14 Calibration

15 Nick Brett – University of Oxford 15 Calibration

16 Nick Brett – University of Oxford 16 Summary  Proposed x-ray survey would occur during construction of ATLAS  Data could be used to remove ambiguities in other alignment techniques  Calibration of hardware is proceeding well  Actual deployment is unlikely

17 Nick Brett – University of Oxford 17 Backup Slides

18 Nick Brett – University of Oxford 18 Forward Scan θ SCT Forward Section Z Axis X-Ray Beam Scanning Head  No need to vary θ continuously, use 2 or 3 fixed angles and vary Z  Simpler and more cost effective  Recent simulation indicates improved accuracy

19 Nick Brett – University of Oxford 19 Support tube and cooling

20 Nick Brett – University of Oxford 20 Module support


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