NEC'2011 VARNA BULGARIA
Time-of-flight system for
controlling the beam composition
P.Batyuk, I.Gnesi, V.Grebenyuk, A.Nikiforov,
G.Pontecorvo, F. Tosello
JINR, 2011
Time-of-flight system for controlling the
beam composition
Monitoring the beam composition
Two main reasons for composition change:
 instability of currents in the elements of magnetic optics
 inaccurate positioning of target station
For monitoring the beam
composition by transit time the
system was built based on
CAMAC (Computer-Aided
Measurement and Control)
modules and ETHERNET Crate
Controller from CAEN.
The system block diagram
Remote connection
To connect the CAMAC Create with remote PC were
used:
C111C Ethernet CAMAC Create Controller
program for remote connection PC with CAMAC
Create
Four main parts of program:
socket creation (socket with two parameters:
IP address, port number)
establish a client - server connection
data exchange
socket destruction
Socket connection
The server is a controller and a program is a client
Data exchange mode
 command F24 is used to stop the spectrum accumulation
in memory module;
 command F17 makes output in the line;
 after LAM signal program switches into spectrum reading
mode;
 command F16 is used to read data from memory.
Results
Spectra were obtained at different currents in the lens
ML31, which focuses beam on the target.
ML31=-21,14
0,43ns/ch
18000
16000
14000
12000
N
10000
8000
6000
4000
2000
0
0 10 20 30 40 50 60 70 80 90 100110120130140150160170180190200
time
Results
 Spectra were obtained for study of the beam
 Spectra shows suitability of the system work
ML31=-21,14
0,43ns/ch
18000
16000
14000
12000
N
10000
8000
6000
4000
2000
0
0 10 20 30 40 50 60 70 80 90 100110120130140150160170180190200
time
References
 V. F. Boreyko, Y. M. Valuev, V. M. Grebenuk and oth. JINR
report R10-85-661, Dubna, 1985;
 V. M. Grebenuk, A. V. Selikov, JINR preprint R10-90-335,
Dubna, 1990;
 V. A. Antuhov, D. Vasilev, N. I. Jouravlev and oth. JINR
report R10-86-854, Dubna, 1985;
 V. A. Antuhov, D. Vasilev, N. I. Jouravlev and oth. JINR
report R10-85-922, Dubna, 1985;
 CAEN Technical Information Manual. Revision n.9 27
May 2009.