1 - Start-up and switch-off the VME
a - Start up
You have first to "control" the VME computer. An account on the VME has defined for this purpose (with low privilege). The login is "mathieu" and password "****" (name of a famous french guy when you are 5 year old). Three cases ougth to be considered depending on the terminal/computer your are using. The terminal is physically connected to the VME, it is the default display and keyboard of the VME computer, thus no network connection is used for that. Any other computer need a proper network connection and a "ssh" client to connect to the VME. Only computers plugged to the 3COM module can do it. If it takes time to get an answer from the VME it means that the network is not well set (typically a cable not plugged...).
| Terminal | Acquistion computer | any computer |
|---|
| login: "mathieu" and password | under X11 type "./logon" and password | under any unix terminal : ssh mathieu@192.168.1.75 or ssh -X mathieu@192.168.1.75 (for X11 support) and password |
b - Switch-off
If you are not using the VME for a few days, it is better to switch it off !! For that you have to use the command called "poweroff". Unfortunatelly only "root" is granted to do so, thus you have to get the privilege of "root" for a while using the same password than before (see table)
- Finally, at the prompt type :"poweroff"
- wait 2 minutes then switch-of the VME on the rear-side.
| Terminal | Acquistion computer | any computer |
|---|
| login: "root" and password | under X11 into the VME type "su" and password | under any unix terminal : ssh root@192.168.1.75 and password |
I would recommend to use the acquisition computer to start-up and the console to switch-off
c - VME Acquisition program
- Once you are into the VME at the prompt type :"./console.exe"
- In the main menu enter a base address (Option "2", the default address is given by "0")
- Go to the "Acquisition mode"
If it is the first time that the VME is booted one has to configure the TDC (read the
manual to define the acquition mode...). A set of default values for single particle counting with pixel anode detector can be as followed:
- Go to the "Micro-controller setup"
- Set the "trigger matching" mode (Option "2")
- Set the window width and offset (Option "4", general values for electrons & ions are 50000 and -50000, see manual)
- Enable trigger substraction (Option "6")
- Set maximum hits (Option "10", a default value could be "32")
- Exit the menu (Option "12")
For the acquitision itself, you can choose between manual or remote acquisition mode.
To avoid a high load of the " VME bus", you have to adapt the acquisition parameters (Option "4" in the acquisition menu"). Typically, for low count/repetition rate one has to set "64", for high count/repetition rate one has to set "1024".
2 - Acquisition scheme
a - Two detectors: one TDC
This is an acquisition scheme for
one single TDC CAEN 1190 in coincidence with another detector. In its first application (2006-2007),
the system combines two detectors:
- electron detector with pixel-lines the channels D16 and H16 are used as time references
- ion detector with resistive anode used as a time filter for the trigger
b - Two detectors: one TDC
not implemented