--- format:markdown ... # Support equipment for the double rake probe: the "silver box". A so-called "silver box" is a part of the experimental setup of the double rake probe. The signal from the probe goes to the silver box, then it goes to the ADC (initial data processing). The silver box consists of 16 modules, each has a switch between the floating potential and the ion saturated current regimes. In the first one, the signal is simply reduced in a voltage divider to 1% of the input signal. In the second one, the probe is also biased to -100 V and the signal also goes through a voltage divider. The silver box is shown in Figure 1, the switch between the regimes is shown in Figure 2. A modul of the silver box is shown in Figures 3-4. The electric circuit of the silver box is shown in Figure 5, and the complete electric circuit of the experimental setup including the probe is shown in Figure 6 [1]. For more information see [Sergei Kulkov, PRPL project](http://golem.fjfi.cvut.cz/wiki/TrainingCourses/FTTF/2019-2020/SerKulk/index). The silver box
Obr.1: The silver box (top).
 The switch between two regimes.
Obr.2: The switch between two regimes.
 A modul of the silver box.
Obr.3: A modul of the silver box.
 A modul of the silver box.
Obr.4: A modul of the silver box.
 Electric circuit of the silver box.
Obr.5: Electric circuit of the silver box.
 Complete electric circuit with the double rake probe.
Obr.6: Complete electric circuit with the double rake probe.
 # Individual "Silver boxes" Each "silver box" has a letter written on it, there are 3 "silver boxes" called "A", "B" and "C". And the individual the modules are numbered from 1 to 16 as in principle, each may have a different configuration. __The current configuration of "Silver box B" is the following:__ | module | big_r [kOhm] | small_r [kOhm]| isat_r [Ohm] | |--------|--------------|---------------|--------------| | B01 | 681 | 6.66 | 223 000 | | B02 | 660 | 6.78 | 4.7 (5W4R7J) | | B03 | 665 | 6.78 | 4.7 (5W4R7J) | | B04 | 686 | 6.76 | 4.7 (5W4R7J) | | B05 | 681 | 6.77 | 4.7 (5W4R7J) | | B06 | 684 | 6.60 | 4.7 (5W4R7J) | | B07 | 677 | 6.76 | 4.7 (5W4R7J) | | B08 | 686 | 6.88 | 4.7 (5W4R7J) | | B09 | 701 | 6.86 | 4.7 (5W4R7J) | | B10 | 682 | 6.43 | 4.7 (5W4R7J) | | B11 | 681 | 6.63 | 4.7 (5W4R7J) | | B12 | 683 | 6.77 | 4.7 (5W4R7J) | | B13 | 680 | 6.94 | 4.7 (5W4R7J) | | B14 | 683 | 6.77 | 1.8 (5W1R8J) | | B15 | 600 | 6.75 | 1.8 (5W1R8J) | # Reference \[1\] [J. Stockel, et al.: Advanced probes for edge plasma diagnostics on the CASTOR tokamak.](http://golem.fjfi.cvut.cz/wiki/TrainingCourses/FTTF/2019-2020/SerKulk/Literature/StockelJ_Advanced_Probes.pdf) # For comments contact me sergei.kulkov@fjfi.cvut.cz or Filip PapouĊĦek at Filip.Papousek at seznam.cz