A Compact Pair Polarimeter and Spectrometer
Lead Research Organisation:
University of Glasgow
Department Name: School of Physics and Astronomy
Abstract
The measurement of polarisation ovservables in hadron physics can provide detailed information about the excited stated of baryons and mesons. A programme of such measurements has been running at the world's major photon beam facilities for several years and has already produced execellent, and well publicised, results. These experiments require highly polarised beams and targets with precisely known properties. In particular, for linearly polarised photon beams, the degree of polarisation needs to be known with as much precision as possible. Recent improvements in luminosity and data taking rates have meant that is often the limiting systematic error in an experiment. This proposal aims to solve the problem by developing a new polarimiter which will be capable of measuring the degree of linear polarisation to better that 2% systematic error, by measuring the asymmetry in the orientation of e+e- pairs produced as the photon passes through a thin converter foil. The design is a compact, modular system based on Halbach dipole cylinders (permanent magnets) and TimePix3 pixel detectors. It is low cost, with minimal readout infrastructure and can be configured for any of the current photon beam facilities (MAMI in Mainz, ELSA in Bonn and CLAS and GlueX in Jefferson Lab, Virginia).
Planned Impact
This proposal would have direct impact for hardon physics photon beam facilities, listed below:
ELSA in Bonn, Germany
MAMI in Mainz, Germany
CLAS at Jefferson Lab, USA
GlueX at Jefferson Lab, USA
By upgrading their polarimety based on the prototype developed in this project they would see a increase in the precision of polarisation measurements. This would have an strong impact on the international hadron spectrosopy research programme which uses partial wave analysys to disentangle the spectrum of excited states of baryons and mesons. That would be relected in high quality publications with leading UK authors.
Further afield, the compact, modular, nature of the design would make it potentially applicable in any situation which requires flux monitoring and polarimetry with medium energy resolution. This could include Wakefied acelerators (eg SCAPA), laser backscattering facilities (eg ELI) and space based applications.
ELSA in Bonn, Germany
MAMI in Mainz, Germany
CLAS at Jefferson Lab, USA
GlueX at Jefferson Lab, USA
By upgrading their polarimety based on the prototype developed in this project they would see a increase in the precision of polarisation measurements. This would have an strong impact on the international hadron spectrosopy research programme which uses partial wave analysys to disentangle the spectrum of excited states of baryons and mesons. That would be relected in high quality publications with leading UK authors.
Further afield, the compact, modular, nature of the design would make it potentially applicable in any situation which requires flux monitoring and polarimetry with medium energy resolution. This could include Wakefied acelerators (eg SCAPA), laser backscattering facilities (eg ELI) and space based applications.
People |
ORCID iD |
Kenneth Livingston (Principal Investigator) |
Description | Design for a compact, in-beam, polarimeter based on Timepix3 detectors has been developed. |
Exploitation Route | Development of high rate modular readout and DAQ for Timepix3 detectors. |
Sectors | Electronics Other |
Description | Nuclear Physics Consolidated Grant |
Amount | £1,817,649 (GBP) |
Funding ID | ST/V00106X/1 |
Organisation | Science and Technologies Facilities Council (STFC) |
Sector | Public |
Country | United Kingdom |
Start | 09/2021 |
End | 09/2024 |
Title | Timepix3 DAQ and readout for Hadron spectroscopy experiments |
Description | A modular readout of up to 16 Timepix3 chips based on FPGA fast processing and data reduction using coincidence with an external trigger. |
Type Of Material | Improvements to research infrastructure |
Year Produced | 2021 |
Provided To Others? | No |
Impact | Developments to be completed in 2021. |
Description | The CB-ELSA experiment |
Organisation | University of Bonn |
Country | Germany |
Sector | Academic/University |
PI Contribution | Expertise in photon polarization and polarimetry. We will develop a polarimiter for CB-ELSA based on the research from the PRD |
Collaborator Contribution | CB-ELSA at the Helmholtz-Institut für Strahlen- und Kernphysik in Bonn is one of the world's foremost facilities for hadron spectroscopy. We will have the opportunity to participate in double polarization experiments connected to our core research programme. |
Impact | Agreement to collaborate on the development and installation of a pair polarimeter based on the results of this award. Agreement to participate in the future research programme |
Start Year | 2020 |
Title | python scripting for timepix3/ADVADAQ and EPICS |
Description | python scripting for timepix3/ADVADAQ and EPICS |
Type Of Technology | Software |
Year Produced | 2018 |
Impact | Demonstration of how to export timepix3 data as EPICS slow control arrays |