Ion beam development for the needs of the JYFL nuclear physics programme.
The increased requirements towards the use of higher ion beam intensities motivated us to initiate the project to improve the overall transmission of the K130 cyclotron facility. With the facility the transport efficiency decreases rapidly as a function of total beam intensity extracted from the JYFL ECR ion sources. According to statistics, the total transmission efficiency is of the order of 10% for low beam intensities (I(total)< or =0.7 mA) and only about 2% for high beam intensities (I(total)>1.5 mA). Requirements towards the use of new metal ion beams for the nuclear physics experiments have also increased. The miniature oven used for the production of metal ion beams at the JYFL is not able to reach the temperature needed for the requested metal ion beams. In order to fulfill these requirements intensive development work has been performed. An inductively and a resistively heated oven has successfully been developed and both are capable of reaching temperatures of about 2000 degrees C. In addition, sputtering technique has been tested. GEANT4 simulations have been started in order to better understand the processes involved with the bremsstrahlung, which gives an extra heat load to cryostat in the case of superconducting ECR ion source. Parallel with this work, a new advanced ECR heating simulation program has been developed. In this article we present the latest results of the above-mentioned projects.
Koivisto
H
H
Department of Physics, University of Jyväskylä, University of Jyväskylä, Finland.
Suominen
P
P
Ropponen
T
T
Ropponen
J
J
Koponen
T
T
Savonen
M
M
Toivanen
V
V
Wu
X
X
Machicoane
G
G
Stetson
J
J
Zavodszky
P
P
Doleans
M
M
Spädtke
P
P
Vondrasek
R
R
Tarvainen
O
O