Online analysis – NEBULA Plus

Table of Contents

Remote online analysis using nptool (RIKEN-LPC)

In order to run an online analysis from RIKEN to LPC you will need ssh access to both ubuntu20 (LPC side) and expand (RIKEN side). Port 8080,8081 and 8082 of expand are redirected to port 10080,10081 and 10082 respectively on ubuntu20.

In this scheme we launch npconversion and npanalysis on expand. nponline is launch on ubuntu20 to avoir high latency with the interface. A tunnel between unbunt20 and your local computer is desirable.

Step 1: Run npconversion on expand

ssh expand
tmux_online

Step 2: running nponline on ubuntu22

ssh ubuntu22
/local/nebula_plus/online.sh

Step 3: tunnel from ubuntu22 to local machine

Either start a tunnel

ssh -L 8084:localhost:8084 ubuntu22

Or add a special ssh connection to your ~/.ssh/config

Host ubuntu22                                                                
	Hostname ubuntu22       
	ProxyJump caelogin.in2p3.fr
	LocalForward 8084 localhost:8084

In the last case, simply ssh to ubuntu20 before going to step 4 and keep your terminal open.

Step 4: spectra visualisation

Launch your favorite web browser and visit localhost:8082 . You may have to edit permission on this website to allow : JavaScript, Pop-Up widows and Background update.

Remote online analysis using nptool (RIKEN-RIKEN)

Step 1: Run npconversion on expand

ssh expand
tmux_online

Step 2: tunnel from expand to local machine

Either start a tunnel

ssh -L 8082:localhost:8082 expand

Or add a special ssh connection to your ~/.ssh/config

Host expand                                                                
	Hostname expand       
	LocalForward 8082 localhost:8082

In the last case, simply ssh to expand before going to step 4 and keep your terminal open.

Step 4: spectra visualisation

Launch your favorite web browser and visit localhost:8082 . You may have to edit permission on this website to allow : JavaScript, Pop-Up widows and Background update.

Quick analysis using terminal, on EXPANDACQ

A simple C++ code has been written that display basics histograms directly in the terminal

ssh expand
display_expand [file_name.fast]

If no file name (with path) is given, reads the last written file, even if this one is presently being created

The interface is minimalist. You can type several commands that are listed in the interface :
– 0 gives you raw charges vs channel number (i.e. all PMTs) — default
– any number projects this 2D onto the corresponding channel (1D histogram)
– to zoom between two abscissa, for example 10 and 20, type the values between columns (i.e. here 10:20)
– log gives you logarithmic scale for 2D histograms
– count and `rate` display scaler total counts or rate resp.

Exit with CTRL+c

Nponline interface npgui (B3F-expandacq)

Online

In a terminal open on expandacq (ssh expandacq)m, type “npgui”
In a web browser: http://expandacq:8000/ (on SAMURAI network, otherwise prepare a port forwarding)
DAQ plugin -> select “FASTER online”
Click “Reload config”
Source: keep “default from config” -> IP 192.168.0.1:6668 on the right
Do not click “start all” (not yet working)
npconversion -> start $\blacktriangleright$
Wait for first buffers (FASTER DAQ should be running)
npanalysis -> start $\blacktriangleright$
Wait for first buffers to be treated
nponline -> start $\blacktriangleright$
Wait for first buffers to be treated
Spectrum server: http://expandacq:9098/ (on SAMURAI network, otherwise prepare a port forwarding)

If one of the process is stalled:

Stop the process ( $\color{red}{\blacksquare}$ ) and the following process(es) in the flow
Restart $\blacktriangleright$ the stopped processes in the order (left to right), waiting for each process to treat the first buffers before starting the next process.

To read a .fast file

DAQ plugin -> select “FASTER replay”
Click “Reload config”
Source: type the path + file name
Start the processes as above for the online
Same spectrum server

RHB counters (May 2026)

In a terminal on expandacq (ssh expandacq) : gotoexp
cd RBH_counters_only
RHB -r &