The European XFEL Beam Loss Monitor System

The European XFEL MTCA based Beam Loss Monitor System (BLM) is composed of about 470 monitors, which are part of the Machine Protection System (MPS). The BLMs detect losses of the electron beam, in order to protect accelerator components from damage and excessive activation, in particular the undulators, since they are made of permanent magnets. Also each cold accelerating module is equipped with a BLM to measure the sudden onset of field emission (dark current) in cavities. In addition some BLMs are used as detectors for wire- scanners. Experience from the already running BLM system in FLASH2 which is developed for XFEL and tested here, led to a fast implementation of the system in the XFEL. Further firmware and server developments related to alarmg eneration and handling are ongoing.The BLM systems structure, the current status and the different possibilities to trigger alarm

The European XFEL Beam Loss Monitor System

The European XFEL MTCA based Beam Loss Monitor System (BLM) is composed of about 470 monitors, which are part of the Machine Protection System (MPS). The BLMs detect losses of the electron beam, in order to protect accelerator components from damage and excessive activation, in particular the undulators, since they are made of permanent magnets. Also each cold accelerating module is equipped with a BLM to measure the sudden onset of field emission (dark current) in cavities. In addition some BLMs are used as detectors for wire- scanners. Experience from the already running BLM system in FLASH2 which is developed for XFEL and tested here, led to a fast implementation of the system in the XFEL. Further firmware and server developments related to alarm generation and handling are ongoing.The BLM systems structure, the current status and the different possibilities to trigger alarms which stop the electron beam will be presented

Status and Commissioning of the Wire Scanner System for the European XFEL

The European-XFEL (E-XFEL) is an X-ray Free ElectronLaser facility located in Hamburg (Germany). The superconductingaccelerator for up to 17.5 GeV electrons will provide photons simultaneously to several user stations. Currently12 Wire Scanner stations are used to image transverse beamprofiles in the high energy sections. These scanners provide a slow scan mode which is currently used to measure beam emittance and beam halo distributions. When operating with long bunch trains (>100 bunches) also fast scans are planned to measure beam sizes in an almost nondestructivemanner. This paper describes the current installations and the latest developments of the system at European-XFEL.Furthermore, the commissioning status of the system andf irst results of beam halo studies will be shown

A Fast Wire Scanner System for the European XFEL and Its Impact on SafetySystems

The European-XFEL is an X-ray Free Electron Laser facility located in Hamburg (Germany). The 17.5 GeV superconducting accelerator will provide photons simultaneously to several user stations. Currently 12 Wire Scanner stations are used to image transverse beam profiles in the high energy sections. These scanners provide a slow scan mode for singlebunch operation. When operating with long bunch trains(>100 bunches) fast scans are used to measure beam sizes in an almost nondestructive manner. To operate fast scans multiple impacts on the beam loss system (BLM) and the charge transmission interlock (TIS) have to be taken into account.This paper focusses on the interaction between these systems and first experiences performing measurements

The European XFEL Wire Scanner System

The European-XFEL (E-XFEL) is an X-ray Free ElectronLaser facility located in Hamburg (Germany). The superconducting accelerator for up to 17.5 GeV electrons will provide photons simultaneously to several user stations. Currently12 Wire Scanner units are used to image transverse beamprofiles in the high energy sections. These scanners provide a slow scan mode which is currently used to measure beam emittance and beam halo distributions. When operating with long bunch trains (>100 bunches) also fast scans are planned to measure beam sizes in an almost nondestructive manner.Scattered electrons can be detected with regular Beam Loss Monitors (BLM) as well as dedicated wire scanner detectors.Latter are installed in different variants at certain positions in the machine. Further developments are ongoing to optimize the sensitivity of the detectors to be able to measure both, beam halo and beam cores within the same measurement with the same detector. This paper describes the current status of the system and examples of different slow scan measurements

A Fast Wire Scanner System for the European XFEL

The European-XFEL is an X-ray Free Electron Laser facility located in Hamburg (Germany). The 17.5 GeV superconducting accelerator will provide photons simultaneously to several user stations. Currently 14 Wire Scanner stations are used to image transverse beam profiles in the high energy sections. These scanners provide a slow scan mode for beam halo studies and beam optics matching. When operating with long bunch trains (>100 bunches) fast scans will be used to measure beam sizes in an almost non-destructive manner. This paper briefly describes the wire scanner setup and focusses on the fast scan concept and first measurements

Status and Commissioning of the European XFEL Beam Loss Monitor System

The European XFEL MTCA based Beam Loss Monitor(BLM) system is composed of about 450 monitors, whichare part of the Machine Protection System (MPS). The BLMs detect losses of the electron beam, in order to protect accelerator components from damage and excessive activation, in particular the undulators, since they are made of permanent magnets. Also each cold accelerating module is equipped with a BLM to measure the sudden onset offield emission (dark current) in cavities. In addition some BLMs are used as detectors for wire- scanners.Experience from the already running BLM system in FLASH2 which is based on the same technology, led to a fast implementation of the system in the XFEL. Further firmware and server developments related to alarm generation and handling are ongoing.The BLM systems structure, the current status and the different possibilities to trigger alarms which stop the electron beam will be presented

Beam Size and Beam Halo Measurements

Beam size measurements: motivations and issues,screen saturation and its study using quad scans,theoretical explanation for saturation,measurements and comparison with new screens.Beam halo measurements:motivations and issues,beam halo collimation simulations,measurements using wire scanners,radiation doses caused by wire scans.Summary and perspective