16:17  Background beam OFF

16:27 Beam On. Acquisition stopped just after beam ON. File:
161125_1617_017.dlt
161125_1617_017.root

BRIKEN rate beam OFF (background): 0.34 +- 0.03 n/s

21:27  Beam off. Background is started.

22:10  Acquisition is stopped. Files:

18/07/2016 
First background measurement overnight.


START: 23:37
File: 160718_FullBrikenFirstData_bkg_*.dlt Run:003-006
Online: 160718_FullBrikenFirstData_bkg.root

Attached screenshots of raw data for every digitizer. 

The problem of some of the PA is visible in the background
spectra. 

In addition one can see in some of the channels signals
distributed over all the region up to the pulser and beyond.
This we found to be related to a too low threshold
but can be eliminated with a better adjustment.

Background measurement with remaining tubes (95) overnight

Listmode: 160719_2343_Bkg_*.dlt, Run: 031-044
Online: 160719_2343_1030_Bkg.root

Unfortunately the 252Cf source remained ind the hall (shielded and far away but still)

Screen shot of neutron spectrum

Background measurement overnight
Start: Oct-6 2242 Stop: Oct-7 10:45

file: 161007_1045_bck.root

See attached figure.
We see that low amplitude noise overlaps with the neutron spectrum.
We also see the grass-like background which extends all the way
up to the ADC range.

Background measurement over night with CLOVER and VETO detectors

ADC #7 added to crate 1 for veto detectors: V1A7
VETO detectors HV off!

Start: 23:45
Stop: 10:56
File: 161012_1056_bck_noise.root

We see a very strong noise in the BRIKEN spectrum!!!
After some work we find that this was a problem
with configuration file: when editing the file
we put the calibration sheet at the beginning this
provoked a mixing of CLOVER and 3He spectra.

Background measurement overnight

Start: 01:17
Stop: 10:35
File: 161014_1035_bck.root

See figure

Background measurement overnight.

Start: 23:27 (07/11/2016)
Stop: 07:52 (08/11/2016)
ROOT file: 161108_0751_Overnight.root


The spectra have a terrible aspect!

This is consequence of DACQ crashing because LN2 filling!

Background measurement overnight

Start: 19:45
Stop: 10:40

File: 170324_1040_BackgroundOvernight.root

BRIKEN system powered and DACQ started after movement.
All looks fine.

Background measurement:
Start: aprox 12:00
Stop: 22:24

File: 170325_2224_Background.root

Background measurement while they play with the beam.

Start: 11:40
Stop: 16:40

File: 170327_1640_Background.root

There seems to be a second component of noise or background
above 50keV which was not there yesterday.
Beam related?

Date: 2/04/2017 
Start: 09:05
BRIKEN run: 76

DLT:170402_0905_Background_076.dlt

BRIKEN Rate: 1 cps 
F11 Rate: 12 cps 

Date: 3/04/2017 
Stop:00:15
BRIKEN run: 78

Root file:170403_0905_0015_B076_B078_Background.root

OBSERVATIONS: AIDA was moved out at about 13:00

Background measurement (no AIDA)


Configuration file: 170526_Conf_BrikenFull.xlsx
Start: 26th-May, at 22:51
Stop: 27th-May, at 09:54

DLT: 170526_2251_bck_noAIDA_019.dlt
RUN: 019-020
RootFile:170526_2251_0954_bck_noAIDA.root

Comments: run 018 was dummy (time reset needed)

Background BRIKEN control measurement
No DLT

2018/10/26
Start: 00:03

Stop: 09:46

ROOT file: 181026_0946_Bkg.root

Background BRIKEN control measurement
No DLT

2018/10/26
Start: 10:00 aprox

Stop: 11:20

ROOT file: 181026_1120_Bkg.root

Background BRIKEN control measurement
No DLT

2018/10/26
Start: 11:57 

Stop: 14:00

ROOT file: 181026_1400_Bkg.root

Measurement re-started at 15:58

Dacq was reinitialized
Background was measurement
Pulser: YES
DLT: No
Online: 181029_1640prevday_1723_Bkg_Pulser.root
Start:16:40
Stop: 17:23

Comment: We started a Ge filling manually, to check if the funny behavior of the 
Corr_BR_BR can be reproduced. It remained clean. So we do not yet what caused the 
funny behavior. 
Funny behavior definition: periodic peaks appeared in the Corr_BR_BR file

The synch software problem will be solved tomorrow. 

Tomorrow definition: a mystical land were 99% of all human productivity, motivation 
and achievement is stored

Background was measurement
Pulser: NO
DLT: No
Online: 
Start:21:07
Stop:

Comment: V2A8C9 contains now the 10Hz clock signal coming from
the same section of the clock where the 100Hz sync signal is extracted.
It will be there even if we inhibit the pulser signals to the preamps

SYNC pulser is 200Hz because 
the gate generator produces double peaks from the 100Hz clock

v1a6c13-16 had a configuration error (Trigger window to  short) 
It's corrected at 14:55 (2018/10/30) on file 181030_Conf_BrikenFull_LowThrAdj_masterCLK.xlsx .

We moved AIDA+BRIKEN by 107cm upstream.
See attached photos.

BRIKEN was aligned with the laser and
AIDA aligned to BRIKEN.

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.