X-ray Survey of the ATLAS SCT Hardware Overview Nick Brett and Jim Loken 15-06-05.
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Transcript of X-ray Survey of the ATLAS SCT Hardware Overview Nick Brett and Jim Loken 15-06-05.
![Page 1: X-ray Survey of the ATLAS SCT Hardware Overview Nick Brett and Jim Loken 15-06-05.](https://reader036.fdocuments.net/reader036/viewer/2022062511/551ae72f5503465e7d8b4a5d/html5/thumbnails/1.jpg)
X-ray Survey of the ATLAS SCT
Hardware Overview
Nick Brett and Jim Loken 15-06-05
![Page 2: X-ray Survey of the ATLAS SCT Hardware Overview Nick Brett and Jim Loken 15-06-05.](https://reader036.fdocuments.net/reader036/viewer/2022062511/551ae72f5503465e7d8b4a5d/html5/thumbnails/2.jpg)
Nick Brett – University of Oxford2
The ATLAS Semi-Conductor Tracker
![Page 3: X-ray Survey of the ATLAS SCT Hardware Overview Nick Brett and Jim Loken 15-06-05.](https://reader036.fdocuments.net/reader036/viewer/2022062511/551ae72f5503465e7d8b4a5d/html5/thumbnails/3.jpg)
Nick Brett – University of Oxford3
Alignment Requirements
Alignment should not degrade track parameter measurements by more than 20%
Mis-alignment of SCT must fall within the following tolerances
1220050SCT Forward
1250 100SCT Barrel
Rø(μm)Z(μm)R(μm)
![Page 4: X-ray Survey of the ATLAS SCT Hardware Overview Nick Brett and Jim Loken 15-06-05.](https://reader036.fdocuments.net/reader036/viewer/2022062511/551ae72f5503465e7d8b4a5d/html5/thumbnails/4.jpg)
Nick Brett – University of Oxford4
Alignment Techniques
Initial X-Ray Survey
Frequency Scanning Interferometry
Track-Based Alignment Procedures
![Page 5: X-ray Survey of the ATLAS SCT Hardware Overview Nick Brett and Jim Loken 15-06-05.](https://reader036.fdocuments.net/reader036/viewer/2022062511/551ae72f5503465e7d8b4a5d/html5/thumbnails/5.jpg)
Nick Brett – University of Oxford5
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
![Page 6: X-ray Survey of the ATLAS SCT Hardware Overview Nick Brett and Jim Loken 15-06-05.](https://reader036.fdocuments.net/reader036/viewer/2022062511/551ae72f5503465e7d8b4a5d/html5/thumbnails/6.jpg)
Nick Brett – University of Oxford6
X-ray Survey Overview
![Page 7: X-ray Survey of the ATLAS SCT Hardware Overview Nick Brett and Jim Loken 15-06-05.](https://reader036.fdocuments.net/reader036/viewer/2022062511/551ae72f5503465e7d8b4a5d/html5/thumbnails/7.jpg)
Nick Brett – University of Oxford7
The Scanning Head
Optical strip readerLinear Motion
BM250
Rotary Motion ADR200
X-Ray Assembly
![Page 8: X-ray Survey of the ATLAS SCT Hardware Overview Nick Brett and Jim Loken 15-06-05.](https://reader036.fdocuments.net/reader036/viewer/2022062511/551ae72f5503465e7d8b4a5d/html5/thumbnails/8.jpg)
Nick Brett – University of Oxford8
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
![Page 9: X-ray Survey of the ATLAS SCT Hardware Overview Nick Brett and Jim Loken 15-06-05.](https://reader036.fdocuments.net/reader036/viewer/2022062511/551ae72f5503465e7d8b4a5d/html5/thumbnails/9.jpg)
Nick Brett – University of Oxford9
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
![Page 10: X-ray Survey of the ATLAS SCT Hardware Overview Nick Brett and Jim Loken 15-06-05.](https://reader036.fdocuments.net/reader036/viewer/2022062511/551ae72f5503465e7d8b4a5d/html5/thumbnails/10.jpg)
Nick Brett – University of Oxford10
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 barrel X-ray beam
![Page 11: X-ray Survey of the ATLAS SCT Hardware Overview Nick Brett and Jim Loken 15-06-05.](https://reader036.fdocuments.net/reader036/viewer/2022062511/551ae72f5503465e7d8b4a5d/html5/thumbnails/11.jpg)
Nick Brett – University of Oxford11
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)h
its
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Nick Brett – University of Oxford12
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
![Page 13: X-ray Survey of the ATLAS SCT Hardware Overview Nick Brett and Jim Loken 15-06-05.](https://reader036.fdocuments.net/reader036/viewer/2022062511/551ae72f5503465e7d8b4a5d/html5/thumbnails/13.jpg)
Nick Brett – University of Oxford13
Calibration
X-Ray Beam
Optical Table
SCT Module
(In transport case)
Z Axis
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Nick Brett – University of Oxford14
Calibration
![Page 15: X-ray Survey of the ATLAS SCT Hardware Overview Nick Brett and Jim Loken 15-06-05.](https://reader036.fdocuments.net/reader036/viewer/2022062511/551ae72f5503465e7d8b4a5d/html5/thumbnails/15.jpg)
Nick Brett – University of Oxford15
Calibration
![Page 16: X-ray Survey of the ATLAS SCT Hardware Overview Nick Brett and Jim Loken 15-06-05.](https://reader036.fdocuments.net/reader036/viewer/2022062511/551ae72f5503465e7d8b4a5d/html5/thumbnails/16.jpg)
Nick Brett – University of Oxford16
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
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Nick Brett – University of Oxford17
Backup Slides
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Nick Brett – University of Oxford18
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
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Nick Brett – University of Oxford19
Support tube and cooling
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Nick Brett – University of Oxford20
Module support