Speaker: Yujiro Yonemura
Abstract: The accelerator facility, which consists of the 8-MV tandem accelerator and the 150-MeV FFA accelerator, has been constructed in Center for Accelerator and Beam Applied Science of Kyushu University. In this presentation, the present status of the FFA are reported.
10 replies on “Status of FFA accelerator in Kyushu University”
Pleased to hear good progress. Could you explain how you extract beam profile from the data on page 15 and what would be the optimum shape you try to achieve?
Thank you for the interesting talk. Could you please explain why the vertical tune/bunch monitor uses an aluminium electrode instead of copper?
Thank you for this very interesting and broad presentation.
I have a couple questions on your beam current monitor.
First, did you consider any kind of a non-destructive monitoring method (such as a wall-current monitor), and if so why did you decide against it?
Second, if I understand correctly, you monitored the current downstream of the extraction septum, but still within the FFA ring; do you intend to have a current monitor in the extraction line itself?
Thank you for interesting talk. If I remember, the capacitive pick-up BPMs had been developed and installed in the ring for beam test. Do you still use the BPM for beam commissioning? If not, could you please explain the reason why you are not using the BPM?
The distribution at the right end of the data shows the integral value of beam profile. Therefore, the beam profile (position of center of beam and right edge of beam) can be obtained by differentiating it. The beam size is 10mm, while the measured beam separation is about 9 mm, which is insufficient. We try to optimized the beam profile so that a beam separation is over 10 mm.
The first reason is the manufacturing cost. The second reason is the problem of a radio activation. Copper has a greater amount of activation than aluminum when beam hit them.
Thank you for your comment.
The beam current is small and the electrical noise of from the power supply is relatively large. At the present stage, It is difficult to measure a accurate current using a non-destructive monitor. After increasing beam current, we try to measure measure current with a non-destructive beam monitor.
Yes. the current monitor will be installed in the extraction line after the optimization of the beam extraction.
At the present stage, a beam profile monitor using fluorescent plate has already been installed in the middle of the extraction line.
The beam current is small and the electrical noise of from the power supply is relatively large. At the present stage, It is difficult to measure a accurate positions with BPM. After increasing beam current, we try to measure beam positions with a BPM.