Speakers
Description
A 320kV ECR platform has been constructed at the Institute of Modern Physics in Lanzhou to deliver intense high charge state ion beams and medium charge state ion beams for atomic physics, material surface research and biology research. This ECR platform can accelerate the ions up to 300q kV. The dynamical range of the projectile velocity is from 0.3 a.u. to 2 a.u., covering electron capture dominant channel to ionization dominant channel.
To accurately monitor the beam in this ERC platform in real-time and non-interceptive manner, a pixelated Residual Gas Ionization Profile Monitor (RGIPM) has been designed. The RGIPM is expected to work in high vacuum condition of 10E-9. It mainly consists of the TiN coated cathode, the micro-channel plate (MCP) and the pixelated anode, which is realized by the TopMetal 2- chips. The magnetic field, formed by NdFeB permanent magnets, is ~0.1 T. The electric field created by the shaping electrodes reside in the magnetic field is ~50 kV/m. The Topmetal chip has rather low noise as ~13e-. The MCP has an electron gain of ~1500, which can provide enough electrons for the pixelated anode. Besides, a mesh is installed at the front of the coated cathode to prevent the secondary electrons, which are generated by ion bombardments, from reaching the anode.
Preliminary simulation and experiments show the RGIPM could provide a spatial resolution of ~5μm. Better spatial resolution can be achieved by adopting the Barycenter algorithm in the on-line data analysis system. This paper will discuss the design, installation and performance study of this RGIPM.
| Submission declaration | Original and unpublished |
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