Time resolved experiments at the Frankfurt 14 GHz electron cyclotron resonance ion source

Time resolved measurements of the extracted ion currents at the Frankfurt 1 4 GHz electron cyclotron resonance ion source (ECRIS) are reported. These m easurements were performed to provide more detailed information on the "bia sed disk effect" in an ECRIS. From a first series of measurements with puls ed biased disk voltage it was concluded that the "biased disk effect" is ma inly due to improvements of the extraction conditions and the enhanced tran sport of highly charged ions into the extraction area. In this article we p resent new measurements with an improved setup allowing for a faster pulsin g of the biased disk voltage. We also present data for the injection of neu tral particles from laser ablated plasmas and Bremsstrahlung spectra for di fferent dc biased disk voltages. All results from these measurements suppor t our previous conclusion. (C) 2000 American Institute of Physics. [S0034-6 748(00)62902-7].