| Paper | Title | Page |
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| WEPB24 | Development of an Online Emittance Monitor for Low Energy Heavy Ion Beams | 1 |
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| RIKEN's 18 GHz ECR ion source supplies the AVF cyclotron with beams ranging from protons to heavy ions as xenon. From comparison with the use of the RILAC (RIKEN Linear Accelerator) and beam transport simulations it was found that the transport efficiency is much lower. To this extend and with the aim to understand the ECR beam production, beam dynamics and optimize the beam transfer we have developed an emittance monitor based on the pepperpot method. The device is composed of a perforated copper plate, transparent scintillator and a CMOS camera for image capturing. Parameters of interest for scintillator's performance are the light yield and radiation hardness. Quartz was found to be resilient to damage and having linear light emission. A real time algorithm written in LabVIEW manages the data acquisition and the 4D phase space distribution calculation. Provided this information, we can investigate parameters such as inter-plane correlation and emittance dependence on extraction specifications, beam current and the magnetic field in the ion source. In this contribution we are presenting the emittance meter design, algorithm description and a set of typical measurements. | ||
WEPB26 |
Emittance Measurement of Low Energy Proton Beam Extracted from RIKEN 18-GHz Superconducting ECR Ion Source with the Pepper-Pot Emittance Meter | |
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| Emittance measurements are of high importance for beam quality assessment and optimization of beam transport. For the case of ECR ion sources providing highly charged heavy ions, the naturally high emittance of beams extracted under strong magnetic field poses extra challenges for efficient beam transport. Moreover, the transverse inter-plane correlation of the 4D emittance is considered to be important so that the beam brightness increases. For the further understanding of the ECR source and increasing the brightness we have developed emittance monitor based on the pepperpot method that allows the measurement of the 4D emittance. The emittance meter consists of a pepperpot plate and a transparent scintillating screen behind it. As a first step, the emittance meter is installed behind the analyzing magnet, and we have obtained beamlet images with 6.52-keV proton (~100eμA) provided by the RIKEN 18-GHz Superconducting ECR ion source. The beam transport is simulated with the Monte Carlo method (GEANT4). The estimated spatial and phase space distribution are reasonably consistent with those obtained with the emittance meter. Ways to optimize the beam transport are also discussed. | ||
WEPB26 |
Emittance Measurement of Low Energy Proton Beam Extracted from RIKEN 18-GHz Superconducting ECR Ion Source with the Pepper-Pot Emittance Meter | |
|
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| Emittance measurements are of high importance for beam quality assessment and optimization of beam transport. For the case of ECR ion sources providing highly charged heavy ions, the naturally high emittance of beams extracted under strong magnetic field poses extra challenges for efficient beam transport. Moreover, the transverse inter-plane correlation of the 4D emittance is considered to be important so that the beam brightness increases. For the further understanding of the ECR source and increasing the brightness we have developed emittance monitor based on the pepperpot method that allows the measurement of the 4D emittance. The emittance meter consists of a pepperpot plate and a transparent scintillating screen behind it. As a first step, the emittance meter is installed behind the analyzing magnet, and we have obtained beamlet images with 6.52-keV proton (~100eμA) provided by the RIKEN 18-GHz Superconducting ECR ion source. The beam transport is simulated with the Monte Carlo method (GEANT4). The estimated spatial and phase space distribution are reasonably consistent with those obtained with the emittance meter. Ways to optimize the beam transport are also discussed. | ||
WEPB26 |
Emittance Measurement of Low Energy Proton Beam Extracted from RIKEN 18-GHz Superconducting ECR Ion Source with the Pepper-Pot Emittance Meter | |
|
||
| Emittance measurements are of high importance for beam quality assessment and optimization of beam transport. For the case of ECR ion sources providing highly charged heavy ions, the naturally high emittance of beams extracted under strong magnetic field poses extra challenges for efficient beam transport. Moreover, the transverse inter-plane correlation of the 4D emittance is considered to be important so that the beam brightness increases. For the further understanding of the ECR source and increasing the brightness we have developed emittance monitor based on the pepperpot method that allows the measurement of the 4D emittance. The emittance meter consists of a pepperpot plate and a transparent scintillating screen behind it. As a first step, the emittance meter is installed behind the analyzing magnet, and we have obtained beamlet images with 6.52-keV proton (~100eμA) provided by the RIKEN 18-GHz Superconducting ECR ion source. The beam transport is simulated with the Monte Carlo method (GEANT4). The estimated spatial and phase space distribution are reasonably consistent with those obtained with the emittance meter. Ways to optimize the beam transport are also discussed. | ||