60Co No AIDA, Efficiency calibration

Start: 12:21
Stop: 12:50

Files:
170526_1221_60Co_noAIDA_z0cm_017.dlt
170526_1221_1250_60Co_z0cm.root

We connect the pulser to both CLOVERs

G7: It looks OK except for the G7-Green as before
(there pulser peak in the spectrum)

D4: the pulser peak appears at very low energies (200-600keV)
there seems to be a problem with pulser processing in the preamplifiers.
Should we still use it? We remove for the moment.


152Eu source calibration.

We put the 152Eu source at the center (on the cardboard)
and check de energy calibration. For most of the crystals
the calibration from March was pretty good except for D4-Red
that the gain changed by a factor 1/2 and D4-blue that changed by 2 (!?)

We redo the calibration:
G7: the resolution at 1.4MeV is 2.7keV
D4: the resolution at 1.4MeV is 3.9keV

DLT File; 170525_0947_152Eu_z0cm.root_000.dlt
RUN Number; 000
RootFile: 170525_1034_152Eu.root
Comments: rate of the clovers increased from 2000cps to 2400cps 
for 10 min (from TS = 41.8E6 ms to TS = 42.4E6 ms)

We plugged the pulser in clover D4. 

DLT File: 170525_0947_152Eu_z0cm_PulserD4_001.dlt
RUN Number: 001
RootFile: 170525_1146_152Eu_z0cm_D4Pulser.root


Source dimensions:
Diameter: 24.98 mm
DZ= 5.98 mm
Source ID: Ref 272, 09/9011
Source label up

Mounting of the CLOVER detectors in position

CLOVER G7: right of beam
CLOVER D4: left of beam

G7 crystals:
Beam ->
Back view: 
Red   Blue
Green Black

D4 crystals:
Beam ->
Front view:
Red Green
Blue Black

Photos of the arrangement with COVER detectors attached

Calibration and resolution check

CLOVER detectors were calibrated in energy with 60Co and 137Cs
60Co source: 2530, 8.81E4Bq (16/03/2010)
137Cs source: CD393 (box), ?
Sources were placed at the center

Resolution(FWHM@1333keV):
G7 Blue:2.67keV
G7 Green: 2.84keV
G7 Red: 2.77keV
G7 Black: 2.64keV
D4 Blue: 3.60keV
D4 Green: 3.35keV
D4 Red: 3.41keV
D4 Black: 4.85keV (!?)

Efficiency calibration with 152Eu
Source place at the center
Source: 272 (09-7011), 1.062E4Bq (error:1.9%)@16/03/2010
File: 160719_2201_152Eu_028.dlt
Online: 160719_2201_152Eu_028.root

Attached 152Eu spectrum

Both COVER detectors are installed in place.
See photos.

Detector D4: left of the beam
Crystal distribution:
BLUE-BLACK
RED -GREEN

Detector G7: right of the beam
Crystal distribution:
BLUE-BLACK
RED -GREEN

Cables connected. Some work on noise minimization.
Resolution improved for D4-Black which was poor 
on July. Otherwise similar behaviour.

See spectra with 137Cs and 60Co sources ta the center.
File:161011_1805_CLOVER_CsCo.root
We are using the calibration from July which
works surprisingly well for all except G7Red
(explains double peak in spectrum)

More checks to be done.

CLOVER energy calibration

Short run with 137Cs and 60Co sources at BRIKEN detector center
to make a new energy calibration

Root file: 161013_1240_137Cs60Co.root

We conected the test input to the pulser, and a new calibration was needed

Root file: 161013_1518_137Cs60Co.root

Energy and efficiency calibration

We make calibrations for the remaining D4 CLOVER detector
(No pulser: D4 preamp does not see the pulser input, a single TEST input)

Sources on the cardboard holder, place at the center of BRIKEN



137Cs (Ref:CD393) together with 60Co (Ref:CD395):

File: 161013_2331_137Cs60Co.root



152Eu (Ref:272/09-7011):

File: 161013_2350_152Eu.root



The threshold in Black,Green and Blue is cutting Ba X-rays.

Activity of the sources:
>> 60Co (Ref:CD395): 338.4 kBq (+-3%) measured on 01.07.1990
>> 137Cs (Ref:CD393): 347.9 kBq (+-3%) measured on 01.07.1990
>> 152Eu (Ref:272/09-7011): 10.62 kBq (+-1,9%) measured on 16.03.2010

See figures.

Efficiency calibration

File "cloversEff.ods" and "cloversEff.xls" contains the experimental efficiency from different measurements
during July and October
(G7 broke before Eu-152 measurement). We can assume the efficiency didn't change from July measurements to
October measurements. 

The last version of Briken tools repository has ben installed at d05, this repository includes the Merger and the BrikenOffline codes, as well as a CommonTools folder to share scripts and code.

For update versions, just type in the desired directory "svn update".

The boron rubber from India is BR-2871, price US-$ 2700 for 2pc 1m x 2m x 3.3mm.
52% B content, density 1.61 g/cm3

We run all the night until the end of beam time, and the Bn correlations are more clear now.

No pulser (inhibit in clock)
DLT: 181026_2244_Bkg_NoPulser_114.dlt
Online: 181026_2259_Bkg_NoPulser.root
TTree: 181026_2244_Bkg_NoPulser_114.root

With pulser:
DLT: 181026_2305_Bkg_Pulser_115.dlt (erased)
Online: 181026_2314_Bkg_Pulser.root
TTree: no

VME crate reset
No pulser:
DLT: 181026_2324_Bkg_NoPulser_116.dlt
Online: 181026_2331_Bkg_NoPulser.root

We adjust all the thresholds reducing them
drastically to see the noise.

Overnight measurement:
Online: 181027_1137_BkgOverNight_NoPulser.root


Start  measurements with DLT
No pulser:
Start: 11:42
Stop: 12:46
DLT: 181027_1142_Bkg_NoPulser_VeryLowThr_117.dlt
Online: 181027_1246_Bkg_NoPulser_VeryLowThr.root
Bckg rate:
Fit to RateBRIKEN= 0.340 cps

With pulser:
Start: 12:53
Stop: 14:08
DLT: 181027_1253_Bkg_Pulser_VeryLowThr_118.dlt & *_119.dlt
Online: 181027_1408_Bkg_Pulser_VeryLowThr.root
Bckg rate:
t(10Hz pulse)= 4458s, BRIKEN:2547 counts, Rate=0.571 cps
tube bkg (Integral(l830,1550))=885, net=1662counts, Rate=0.373cps
Fit to RateBRIKEN= 0.566 cps

252Cf source in the center 
With pulser:
Start: 14:37
Stop: 16:51
DLT: 181027_1437_252Cf_Pulser_VeryLowThr_120.dlt Runs: 120-123
Online: 181027_1437_252Cf_z0cm_Pulser_VeryLowThr_1652.root
252Cf rate:
t(10Hz pulse)=7973.80 s, BRIKEN: 7.66289e+07 counts, Rate= 9610.09 cps
Fit to RateBRIKEN= 9594.69 cps

No pulser:
Start: 16:57
Stop: 18:47
DLT: 181027_1657_252Cf_NoPulser_VeryLowThr_124.dlt
Online:181027_1657_252Cf_z0cm_NoPulser_VeryLowThr_1847.root 
Fit to RateBRIKEN=9591.79 cps

Background:
No Pulser:
DLT: No
Online: 181028_1056_BkgOverNight_NoPulser.root

With pulser:181028_1056_1641_Bkg_Pulser.root
DLT: No
Commments: Corr_BR_BR looks funny. It shows periodic peaks. Probably related to the 
filling of the Ge detector. We will stop to check if it appears again

22/10/2017
Start: 01:26
Run: 037

Stop: 11:01
Run: 039

List mode: 171022_0126_bck_*.dlt
Root file: 171022_0126_1101_bck.root

Observations:
1. The noise in 3He tubes has been effectively suppresed 
(compare figure of BRIKEN spectrum in attachment with similar
figures of previous runs)
2. The 252 Cf source used immediately before has activated
something as can be deduced from the change of rate
in the D4 detector compared to G7 (standing on the floor)
see picture below. The effective half-life of the activation is
T1/2=71.8min
(see figures in attachment)

18/10/16 START: 16:56
18/10/17 STOP: 9:51

ROOT file: 181017_0951_BkgOverNight.root

Comment:
Tube 121 is noisier than the others (see fig).

Issue:
all the channels connected to PA3 and PA4 
have twice the number of counts than the remaining channels (!?).
Actually the pulser counts.

Solution:
This channels are from UPC tubes and are connected to pulser PB-5.
We found that the threshold of external trigger was set to 1V
instead to 1.8V as before and this was producing a double pulse (see photo)
like triggering on the fall and rise of the trigger pulse.
This happen whenever the threshold as below 1.6V.
We do not understand this: the signal has +2.2V and no apparent ripple (!????).
We set threshold to 1.8V and now is OK

Background measurement for threshold determination



Started at 14:45
Stopped: 16:35

Root file: 161103_1635_bck.root

Measurement overnight

Start: around 1:00
Stop: 9:35
File: 161105_0935_BackgroundOvernight.root

The background level after removing the 252Cf source
from the hall dropped to 0.4n/s.

During the night there were neutron rates up to 120 n/s (see figure)

There is a huge spike in the rates which coincides with the time of 
LN2 filling. One can see spike in several spectra (not in all)
One can see also a structure superposed

The rate per rings is also shown. The outer rings see
a higher rate.

Also shown is the comparison of He107 one  (blue) of the outer ORNL2 tubes
with He084 one (red) of the inner ORLN2. The increase in count rate
is about 30%. 

Also shown is the comparison of two external tubes on the top and the bottom:
He107 (blue) and He137 (red), ORNL2 tubes.  There is no increase in count rate.

Also shown is the comparison of a tube above the lead shielding He028 (blue)
and behind the lead shielding He048 (red), UPC tubes. There is no difference.

There is also  comparison between the rate in the CLOVERS and BRIKEN.
Without beam the rate in the Clovers is around  100 g/s against 0.4 n/s in BRIKEN
At the maximum both rates are similar around 130 c/s.

There is also a plot of the gamma-neutron correlation.
We see that there are neutrons which are detected before
the gammas. A possible explanation several neutrons are produced
one is detected first the second later produces a gamma.

Background, No AIDA

Start:22:31
Stop: 09:24

dlt files: 170525_2231_bck_noAIDA_z0cm_010.dlt
run: 010-011-012

root file: 170525_2231_0924_bck_noAIDA_z0cm.root

Starting from today 12:22, the background generated by the different setups on BigRips is monitorized.

- 30 min aprox Beam off
- 25 min aprox 29F after C target in F8
- 14 min aprox Beam Off
- 272 min aprox 27F
- 11.5 min Beam Off
- Tunning for 10Min

Adquisition is stopped at 18:22

Files: 
161124_1222_010.dlt
161124_1222_011.dlt
161124_1222_010.root (online)

The RUN summary for this experiments is found in
http://ribfdaq/~gamma16/expdbrunsum.php (Access only from RIKEN)

16/11/25 12h28min: Background measurement beam ON 19B

16/11/24 21h06min: Background measurement Beam OFF + Beam ON tunning and 22C

21:41 : Until now Beam OFF, BigRips team tunning the machine. An online is saved 
File:        161124_2106_013.root