Collaborators,

Attached is a phone photo of example signals from the new preamps with 3 3He tubes connected to a scope. Scope channels 1,2,3 (color y,c,m respectively) are preamp channels 1,2,3 while 4 (green) is open. Trigger is on channel 3, at 500mV/div and other channels are at 500,200,and 20 mV/Div for channels 2,1,4 respectively. Time scale, though glared out should be 10us per div ( although we saw longer rise times as well). 

Signals were all good for all channels. Coincident with real signals were other negative signals ~15x (750mV/50mV magenta/green) smaller and with a different shape. No positive signals were observed in any channel. 

This picture is representative of the 

Collaborators,

Attached is a phone photo of example signals from the new preamps with 3 3He tubes connected to a scope. Scope channels 1,2,3 (color y,c,m respectively) are preamp channels 1,2,3 while 4 (green) is open. Trigger is on channel 3, at 500mV/div and other channels are at 500,200,and 20 mV/Div for channels 2,1,4 respectively. Time scale, though glared out should be 10us per div ( although we saw longer rise times as well). 

Signals were all good for all channels. Coincident with real signals were other negative signals ~15x (750mV/50mV magenta/green) smaller and with a different shape. No positive signals were observed in any channel.

This picture is representative of the signals of 2 new preamps as well as the functional spare already at UT. 

Additionally, the two preamps sent for repair have been received.

NTB, KPR

There is a new plastic scintillator
after the MUSIC chambers

The detector has a central hole of 108mm (with) x 38mm (height)
and is 3mm thick and is placed behind the existing plastic 
scintillator which is 5mm thick.
(see photo)

For second part of Takechi's run:

Directory: /data/1611Commissioning/161107Parasitic
Config File: 161107Conf_BrikenFull.xlsx

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

 New detector placed under the beam line, below MUSIC chamber

This detector replace the USA tubes in the DACQ because we need the preamp to plug it.

The Al degrader thickness was reduced to 4.8mm

Configuration file saved on 22-Oct-2017 at 00:59
after increasing all the threshold in all 3He tubes to about 100keV.
Also the threshold of Clover detectors was slightly increased.

Configuration of BRIKEN DACQ hardware:
Detector->VME->ADC->Channel

New configuration:
Ancillaries are moved to crate #2: V2A8 (SIS3316)
YSO is on crate #1: V1A7 (SIS3316)
V2A4 (SIS3302) failed and was replaced wit spare unit (Chan #5 missing)

Ancillaries are reduced to F11 Plastic (Right and Left, Direct and Attenuated)
and AIDA Plastic veto. The 10Hz pulser signal is also fed to this ADC (Dead Time Pulser).

YSO provides 5 signals: xa, xb, ya, yb and dynode.
Each signal is splitted. One branch of xa,xb,ya,yb is amplified
the other goes directly (but it might be eventually attenuated).
 
See attached file

-1

New configuration file: 
170331_Conf_BrikenFull.xlsx

with a new calibration 
for Si_T,B and F11_PL_R,L. 

Increased low energy limit for F11Rrate to 1MeV

New configuration file:
170330_Conf_BrikenFull.xlsx

Tha gain of F11_PL TFA was changed from x2 to x4

In Conf file histogram ranges were changed for 
F11_PL_L and _R: 30 MeV
F11_PL_L_HG and _R_HG: 200 MeV
Si_T and _B:  200 MeV

the gain for F11_PL_* was changed to 0.0025 (x2)
Thhe gain for Si_* was changed to 0.0007 (x10)

A new gated spectrum was added: F11RgateSiT

161125Conf_BrikenFull.xlsx

To have a range of about 200 MeV

Ortec671 Gain from x20 to x5 (fine gain : x0.5)
HV from 1500V to 1300V
60Co-> 10 mV

Root file: 161107_1800_AIDAplasticCalib.root

calibration a1= 0.001 MeV/units

Drawings of the polyethylene neutron moderator and table assembly

 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. 

Beam tuning in BigRIPS

At 19:00 access to Exp. Area was closed and the tuning
of BigRips started.

Unfortunately the 252Cf was left on the table close
to the stairs and cannot be removed until 23:00.

We did a background measurement
Start: 19:00
Stop: 22:18

File: 161104_2218_BeamTuning.root

In the attached figure 1 one can see a plot of the rate
(neutrons/10s) in the BRIKEN detector during this time
The rate was at high as 150n/s during this period.
We estimate that the influence of the 252Cf source is about 15n/s
(corresponds to the lowest rates)

Also attached are pictures of the Top and Bottom plastic veto detectors
mounted just above and below the hole in the shielding.
Interestingly the bottom sees less counts at high energy
and this could be related to the 10cm lead wall raised
before the degrader to protect AIDA that covers only partially 
the top detector.

Also attached is the neutron spectrum for the different rings superposed.
(ROOT color code)

Date: 1/04/2017
Start:12:00
BRIKEN run: 56
AIDA Run: R20_131
BigRIPS run: 209
DLT:170401_1200_Na37_056.dlt


BRIKEN Rate: 1.5 cps
F11 Rate: 8.5 cps

Date: 1/04/2017
Stop: 12:58
BRIKEN run: 56 
AIDA Run: R20_176
BigRIPS run: 0209

Root file: 170401_0157_1159_B056_Na37Ne36.root
OBSERVATIONS: spectra was NOT cleared

Date: 1/04/2017
Start: 09:03
BRIKEN run: 54
AIDA Run: R20_115903
BigRIPS run: 206
DLT: 170401_0741_Na37_053.dlt
(change name, wrong starting time) corrected to 170401_0903_Na37_054.dlt

BRIKEN Rate: 1.5 cps
F11 Rate: 8.5 cps

Date: 1/04/2017
Stop: 
BRIKEN run: 54
AIDA Run: R20_130
BigRIPS run: 206

Root file: 170401_0157_1004_B054_Na37Ne36.root

OBSERVATIONS: PPAC discharges every ~10min (got better)