PMT vs magnetic field paper
Back to Main page
Back to Camera paper page
Contents
Outline of the project
- Purpose: Evaluation and understanding of effect of magnetic field on the PMTs of CTA LST-1
- Onsite test
- - Effect of geomagnetic field was examined by calibrating the camera at different pointing directions.
- - 0.5% change in PMT gain depending on x-component of geomagnetic field was seen
- - No problem in terms of the telescope performance
- Investigation at lab
- - In order to confirm that the result of the onsite test can be explained by the geomagnetic field, measurement is performed at lab.
- - Multi p.e. signal shows small dependence even with weak magnetic field close to geomagnetic field.
- - Single p.e. signal indicates positive correlation between gain and magnetic field, which is qualitatively consistent with the LST-1 result.
- - Results obtained with the F-factor method indicates the dependence seen in the onsite test is indeed likely to be due to effects of the geomagnetic field.
People involved
- Y. Kobayashi
- D. Tateishi
- Y. Sunada
- T. Saito
Index and contents
- Introduction
- The onsite test
- - Introduction to the LST-1 camera
- - Method
- - Results
- - Discussion
- Measurement at laboratory
- - Measurement setup
- - Calibration of the Magnetic field
- - Data acquisition and analysis
- - Results
- - Discussion
- Discussion
- Conclusions
