As we said over the phone here are the LET values for the latchup test. We expect it to occur between 1000 MIP (1.66 MeV. cm -2.mg -1)and 5000 MIP (8.3 MeV. cm -2. mg -1). In order to get those LET values, looking at the tandem website, I guess we need to use carbon / oxygen / and fluor. The energy range doesn't really matter as long as you choose some values which are equaly choosen between 1000 and 5000 MIP. Chuck wanted to give me the fastest way to do this given the values above. In terms of fluance I would recommand to start very low and then once you are sure that the setup is ok, increase it to be faster. In order to have a nice smouth curve, I think we need at least 15 points (between 1000 and 5000 MIP). The corresponding run time should then be about 3 to 4 hours (knowing that it will take about 5 min. to change energy between each data point, and 30 minutes to change your ion spishes). It is also important to let Chuck know that we would like to have 2 data file open at the same time (1 for the digital part of the chip and one for the analogue part) He told me that this was supposed to be possible but he wanted to make sure with a software expert. This way you only need to take one measurement per selected energy. and other thing you may need to tell him is that the range we need is about 20 microns, and that we don't care about the beam angle (0 degre is ok all the time). Once in a while you need to take the same data point again with the clock running to make sure that the chip is alive. I would not be surprise if you don't see any latchup event below to 2 - 3 000 MIP. The curve we want to get at the end is LET as a function of the latchup pros pection calculated by their software given the number of lutchup event in a run that you get from labview. As I said over the phone, I also recommand you to play with the control software available on the website. So here is a very short version of the run plan. As I told you I don't have internet access here (this email had to be dicteted to somebody over the phone).