Speaker
Description
Isochronous mass spectrometry (IMS) is one of mass measurement methods particularly effective for short-lived nuclei. In this method, a storage ring is used to measure the revolution time of the particles. Since the revolution times of the particles are proportional to the mass-to-charge ratios of the particles, the nuclear masses can be deduced using IMS. One of the storage rings for IMS is the Rare-RI Ring (R3) at the RIKEN RI beam factory. This device is in operation and has successfully measured the masses of rare isotopes [1].
Recently, we have upgraded the mass measurement method in R3 and are attempting to derive masses with smaller uncertainties. To improve the beam transport and statistical errors, two vertical steering magnets were installed upstream of R3. These magnets were tested in the previous experiment, and resulted in a seven times higher yield compared to that without the magnets. A new beam tuning method is also being studied to obtain the revolution time with high accuracy. In this beam tuning method, it is important to adjust the angle of the particles injected to R3. Finally, a new Schottky detector was installed in R3. This non-destructive detector aims to measure the magnetic rigidity of particles inside R3 and is expected to be a key device to improve the beam transport and/or more precise mass measurement in the future.
This presentation will first introduce a conventional mass measurement method of R3. Next, the principle and method of mass measurements currently under development will be discussed.
| Email address | asahi.yano@riken.jp |
|---|---|
| Supervisor's Name | Akira Ozawa |
| Supervisor's email | ozawa@tac.tsukuba.ac.jp |
| Classification | Storage rings |
