Publication
Controlo Digital e Nova Electrónica para o Banco de Testes para o Sistema de Alta Tensão dos Fotomultiplicadores do Tilecal
| Summary: | The current TileCal hadronic calorimeter high voltage distribution system (HVDS) of the ATLAS experience was developed in the 1990s. A large part of its components is already obsolete and since it is expected to have performance degraded in the near future due to continuous exposure to very high levels of radiation, it is necessary to update the HVDS. The new remote HVDS will be placed outside of the detector, in a region that will not be affected by the radiation, that maximizes the reliability and robustness of the system. The remote high voltage distribution system is based on a pair of boards, the HV Remote board that individually regulates and monitors the high voltage for 48 outputs and the HV Supplies board that generates the primary high voltages and supplies the low voltages necessary for the HV Remote to work. Each output will supply a photomultiplier tube (PMT). It is a complicated task to test the 48 high voltage outputs manually, so the need arose to have a board that automatically monitors the outputs individually. Therefore, the present work consists of the development of a board that automatically monitors the high voltage and low voltage outputs, that is called HV Test. This was developed to monitor 96 high voltage outputs, which corresponds to two pairs of HV Remote cards, and 4 low voltages supplied by the crate. The crate is a bin that houses 16 pairs of cards that are connected to an intermediate card, which connects them to the FPGA digital control card. The HV Test board allows for internal monitoring using an ADC and/or external monitoring using a voltmeter. This was developed on the synchronous serial communication protocol, called Serial Peripheral Interface (SPI). The user interface for communication with the HV Test was developed, and the communication code between the interface and the card was developed both for the 1st and the 2nd prototypes, and the respective classes for operation and communication with the ADCs. To control the card, only a device based on the system on chip system is needed, which allows implementing the SPI communication protocol and communication with the ATLAS digital control system. In this work, the Raspberry Pi is used. Finally, a set of stability tests was carried out HV distribution system in the Test Beam Module at CERN. |
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| Main Authors: | Marques, Rui Miguel Fernandes |
| Subject: | PMTs Tilecal Teste de HV Automatização de Medidas Teses de mestrado - 2023 |
| Year: | 2023 |
| Country: | Portugal |
| Document type: | master thesis |
| Access type: | open access |
| Associated institution: | Universidade de Lisboa |
| Language: | Portuguese |
| Origin: | Repositório da Universidade de Lisboa |
| Summary: | The current TileCal hadronic calorimeter high voltage distribution system (HVDS) of the ATLAS experience was developed in the 1990s. A large part of its components is already obsolete and since it is expected to have performance degraded in the near future due to continuous exposure to very high levels of radiation, it is necessary to update the HVDS. The new remote HVDS will be placed outside of the detector, in a region that will not be affected by the radiation, that maximizes the reliability and robustness of the system. The remote high voltage distribution system is based on a pair of boards, the HV Remote board that individually regulates and monitors the high voltage for 48 outputs and the HV Supplies board that generates the primary high voltages and supplies the low voltages necessary for the HV Remote to work. Each output will supply a photomultiplier tube (PMT). It is a complicated task to test the 48 high voltage outputs manually, so the need arose to have a board that automatically monitors the outputs individually. Therefore, the present work consists of the development of a board that automatically monitors the high voltage and low voltage outputs, that is called HV Test. This was developed to monitor 96 high voltage outputs, which corresponds to two pairs of HV Remote cards, and 4 low voltages supplied by the crate. The crate is a bin that houses 16 pairs of cards that are connected to an intermediate card, which connects them to the FPGA digital control card. The HV Test board allows for internal monitoring using an ADC and/or external monitoring using a voltmeter. This was developed on the synchronous serial communication protocol, called Serial Peripheral Interface (SPI). The user interface for communication with the HV Test was developed, and the communication code between the interface and the card was developed both for the 1st and the 2nd prototypes, and the respective classes for operation and communication with the ADCs. To control the card, only a device based on the system on chip system is needed, which allows implementing the SPI communication protocol and communication with the ATLAS digital control system. In this work, the Raspberry Pi is used. Finally, a set of stability tests was carried out HV distribution system in the Test Beam Module at CERN. |
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