Source details:

Diameter: 25.05 mm
Dz: 3 mm
Source ID: CD 392

With pulser
Start:17:45
Stop: 18:08

Files saved:

170525_1146_152Eu_z0cm_D4Pulser.root
170525_1745_133Ba_z0cm_PulserD4_002.dlt

Ps. See that the pulser generates peaks in the region 250-270 keV (to avoid people to invent new levels (and
gammas) populated 
in the beta decay of 133Ba). 

Measurement over night with a 152Eu source inside

Start: 22:48 (03/11/2016)
Stop: 08:26

File: 161104_0826_152Eu.root

Neutron background rate: 0.82 n/s

Test of individual 3He tubes

The tests were done using the ATOMKI MCA and
HV: ISEG NH204M
Preamp: Mesytec MHV-16 (Unipolar IFIC) 
Amp: ORTEC671 (Gain=5x0.5,SHP=6us)
Pulser: 10Hz-Clock + TC410A G&DG + BH-1 (tr=1us,tf=1ms,amp=0.7)
Spectra measured with 1024 channels
Counting time:   100s (UPC, RIKEN and ORNL 1")
                 120s (ORNL 2")
Neutron source:   252Cf
PE setup: 1 inches tubes were tested on the BELEN-20 PE matrix, while for 2 inches tubes a moderator was prepared 
using existing material (see attached figures). 

Attached a figure with a sample spectrum for each tube type
and a  compressed file with all the measured spectra in ASCII format.

All the tubes performed correctly. The neutron signal is well separated from the noise. 
The RIKEN tubes have the highest gain. Gain in the UPC tubes is the lowest.
 

 We have carried out a scanning of the neutron efficiency with respect to the position along the Z-axis (AIDA and BEAM hole) of a 252Cf neutron source. A preliminary analysis is presented based on data from the online. A plot with the comparison of the simulations and experimental data is attached. The experimental results are in good agreement with the GEANT4 simulations of the studies for design of the neutron detector. The simulations for the design of the hybrid mode were calculated using 148 3He counters. The  version of the hybrid detector assembled during the current campaign (July-2016)  is using 140 3He counters. The missing counters correspond to tubes located on the outer part of PE, thus the effect of these counters on the total neutron efficiency is minimal. 

Preamplifier and signal cable testing

We check all signal cables,the flat cable connector to BNC 
from ORNL/UTK and they are OK.

While checking the preamplifiers (PA) we realized that on the oscilloscope
some of the channels shown pulses without a load when HV is on.
After some checks, we come to the conclusion that is a kind of discharge
on the HV part of the preamp (which appears as positive pulse or negative pulses)
and induce pulses of opposite sign in one or mos neighbouring channels.
After systematically investigating them in the scope, we plug them in the DACQ
to record the spectra. For this we include an additional digitizer SIS3316
to connect al1 channel preamps
PA1(D):UPC:SN-0808223 -> V1A1
PA2(D):GSI:SN-1112572 -> V1A2
PA3(D):UPC:SN-0310315 -> V1A3
PA4(D):UPC:SN-0808220 -> V1A4
PA5(U):UTK: ? -> V1A5
PA6(U):UTK:SN-0808218 -> V1A6
PA7(U):UTK:SN-0713586 -> V1A7
PA8(U):UTK:SN-0808221 -> V2A1, V2A2
PA9(U):UTK:SN-0808215 -> V2A3, V2A4
PA10(U):UTK:SN-0808217 -> V2A5, V2A6

We measure first with a tube of each type connected to Ch#1 of each PA
to adjust parameters of digitizers and range
List-mode: 160717_preampCheck_000.dlt
On-line: 160717_preampCheck.root

Then we remove the tube from Ch#1 to see the effect in this channel:
List-mode: 160717_preampCheck_noTubes_001.dlt
On-line: 160717_preampCheck_noTubes.root

We attach screenshots for both as compressed files (.zip)
and the root files

Geant4 BRIKEN Neutron efficiency calculations as a function of neutron energy and for some spectra: Ga84-vandle, Br88-endf71, Rb94-endf71, Rb95-endf71, I137-endf71, Cf252-MCNPX
  

Calculations for the current BRIKEN detector configuration:

Hybrid mode, 140 counters, assembled in July16.


Summary of files:

BRIKEN_hybrid140.svg  ---> Scheme for the current tube configuration. 

BRIKEN_hybrid140_efficiency.xlsx  ---> Sheet with results of the calculations.

Efficiency_vs_Energy_HybridConf_140b.svg ---> Plot of the neutron efficiency by Ring (see BRIKEN_hybrid140.svg) and total.

ROOT macro for calculation of neutron rates in the BRIKEN detector

Here a ROOT macro to calculate neutron rates from onlines root files generated DAQ configuration 
160718Conf_BrikenFull_cal5.xlsx (and the later ones).

Setup parameters are indicated at the begining of the macro. An output data file is generated with the rates by counter, ring and ADC. If the input root file is "file.root", the 
output data file is "file.root_data".

Further questions by email to: atarisal@gmail.com


 

A new directory in the IFICdaq computer has been created for the parasitic measurements during the Fallon Beam Time.

The path of the folder is:
/home/dacq/Desktop/Data/2211Fallon/

All the work during this campaign will be stored in folders inside here.

For the period before the parasitic experiments, the test and check of the detector will be stored in 
/home/dacq/Desktop/Data/2211Fallon/2211FallonPreparation

The Config file for the test is:

161107Conf_BrikenFull.xlsx

Run for checking the noise just after turn on the crates, without high voltages on the PREAMPS.

Attached calibrated histogram for the full BRIKEN detector. 

Files:
161122_1820_000.dlt
161122_1820_000.root

Pulser counts: 1.179e4

In order to access to the synchronization test, we prepare two programs in the PC  briken1 ( 10.32.6.54).

To Launch the processes, in a terminal type: DataSink -i 3

In other terminal type SynCheck

By default this preform a test with difference RIBF-BRIKEN and AIDA-BRIKEN.

In case of BRIKEN is not running, the option "SynCheck -M 1" perform de differences AIDA-RIBF and BRIKEN-RIBF, and "SynCheck -M 2"  RIBF-AIDA and BRIKEN-AIDA

AIDA Data Relay:

The programming transmitting the data from AIDA to the DataSink includes an intermediate filtering step. This selects only correlation scalars from one module (and possibly ADC values from one channel in that module).

To run the program from aidas1 PC:

DataRelayFilter -n 10.32.6.54 -p 10307 -I 2
 

"-I 2" selects ID 2 as the one for the AIDA data stream, which must correspond to the one expected by the DataSink in the briken1 PC.

The attached screenshot show the terminal when running the code in verbose mode (-v 1), and also sending the ADC energy of the pulser in channel 10 of NNAIDA11 (adc ~38600 ch). This was for random pulser; for a fixed pulser delta will show constant value of delta (timestamp difference between consecutive correlationpulses).

=======    START    =======
Date 2016/11/27
Start time	: 18:59
BRIKEN run	: 035
Daq Conf. File	: 161125Conf_BrikenFull.xlsx
DLT File name	: 161127_1859
AIDA run	: R23_0
AIDA start	: 19:19
BigRIPS run	: 40Mg-1034
BigRIPS start	: 18:33
 
---------------------------
Shifters:  PV, AE, GK, TD
=======    Setup    =======
Central fragment:  40Mg
--- Degraders ---
 Fixed: 1mm Al + 3mm Pb attached to beam hole in BRIKEN PE shielding
 Variable: 
1=(0.5mm W+1mm Al), 2=(0.3mm W+1mm Al), 3=(1mm W +1mm Al)
1. IN
2. IN
3. OUT

=======  COMMENTS   =======

2016/11/27
19:19: There is a transient, AIDA DAQ found stopped due the incompleted LN2 filling.

------  Rates  ------
BRIKEN	:   Hz
F11R	:   Hz
Clovers	:   Hz
VPLT	:   Hz
VPLB	:   Hz
AIDAPL	:   Hz

=========   END   =========
Date 2016/11/27
BRIKEN run	: 035
BRIKEN stop	: 19:23
ROOT online	: 
AIDA run	: R23_4
AIDA stop	: 19:19
BigRIPS RUN	: 1034