We mount back all preamplifiers
Initially we used all the PA coming from US, the repaired and the new ones.
There was an issue with the new ones (strong noise and cross talk)
until we realized that the new ones were of differential type
instead of unipolar. We decided to mount all unipolar so we use
the repaired ones plus the ones which were left here and 
had some minor problems with discharges.

We decided to change slightly the gain of the pulser signals
because for PA6 to PA10 the amplitude after the preamp was 2.2-2.4V
so it was saturating the ADC.
So we decreased Pulser 1 (RIKEN, ORNL1, ORNL2, CLOVER) 
from 690mV to 540mV (NEG) on the scope (50ohm)
and increased Pulser 2 (UPC) from 90mV to 100mV

We started the assembly of BRIKEN and AIDA detectors in their final position
on Tuesday October 4:

Gabor Kiss, Phong Vi, Keishi Matsui, Shunji Nishimura, Shigeru Kubono, PA,
Chris Griffin, Tom Davinson, Nathan Brewster, Shintaro Go, Daniel Stracener,
Ariel Tarifeno, Jorge Agramunt, Alvaro Tolosa, Jose L Tain

Tubes were removed from BRIKEN. PE matrix lifted with crane.
Table rotated and placed in the final position (front wheels 
between forward EURICA rails) by hand. Table leveled (height, angle)
with the help of laser. PE matrix placed back.
AIDA rotated and adjusted to BRIKEN by hand.

See photos

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

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 

 According to the reply from Japan Radioisotope Association, the accuracy of the Cf-252's intensity is +0%/-15%.

( "+0%" is important, because 3.7 MBq is a standard limit for radio-active sources  in Japan.)

20/JUL/2016 20:00 
End of the test measurements

DACQ configuration parameters

The last configuration file used was: 160718Conf_BrikenFull_cal5.xlsx

Most relevant configuration parameters:
3He tubes:
For all channels:
Input: InputRange: 2V, Impedance: 50Ohm 
Tigger: Fast filter IntTime: 40, FlatTop: 20

V1A1C1-C16: (RIKEN: PA1,PA2) 
Input: Offset: 50000, Polarity: + (POS)
Trigger: GateLength: 800, PreTrigger: 250, Threshold: 2000
Slow Filter: IntTime: 250, FlatTop: 50, Tau: 25000

V1A2C1-C8: (RIKEN: PA2) 
Input: Offset: 50000, Polarity: + (POS)
Trigger: GateLength: 800, PreTrigger: 250, Threshold: 2000
Slow Filter: IntTime: 250, FlatTop: 50, Tau: 25000

V1A2C9-C16: (UPC: PA3) 
Input: Offset: 50000, Polarity: + (POS)
Trigger: GateLength: 800, PreTrigger: 250, Threshold: 10000
Slow Filter: IntTime: 175, FlatTop: 50, Tau: 25000

V1A3C1-C16: (UPC: PA3,PA4) 
Input: Offset: 50000, Polarity: + (POS)
Trigger: GateLength: 800, PreTrigger: 250, Threshold: 10000
Slow Filter: IntTime: 175, FlatTop: 50, Tau: 25000

V1A4C1-C4: (UPC: PA4) 
Input: Offset: 50000, Polarity: + (POS)
Trigger: GateLength: 800, PreTrigger: 250, Threshold: 8000
Slow Filter: IntTime: 175, FlatTop: 50, Tau: 25000

V1A4C5-C16: (UPC: PA5) 
Input: Offset: 15000, Polarity: - (NEG)
Trigger: GateLength: 1000, PreTrigger: 250, Threshold: 15000
Slow Filter: IntTime: 250, FlatTop: 100, Tau: 25000

V1A5C1-C16: (ORNL1: PA6) 
Input: Offset: 15000, Polarity: - (NEG)
Trigger: GateLength: 1000, PreTrigger: 250, Threshold: 3000
Slow Filter: IntTime: 250, FlatTop: 100, Tau: 25000

V1A6C1-C16: (ORNL2: PA7) 
Input: Offset: 15000, Polarity: - (NEG)
Trigger: GateLength: 1200, PreTrigger: 350, Threshold: 3000
Slow Filter: IntTime: 350, FlatTop: 100, Tau: 25000

V2A1C1-C8: (ORNL2: PA8) V2A2C1-C8: (ORNL2: PA8) 
V2A3C1-C8: (ORNL2: PA9) V2A4C1-C8: (ORNL2: PA9) 
V2A5C1-C8: (ORNL2: PA10) V2A6C1-C8: (ORNL2: PA10) 
Input: Offset: 48000, Polarity: - (NEG)
Trigger: GateLength: 1000, PreTrigger: 100, Threshold: 200
Slow Filter: IntTime: 350, FlatTop: 100, Tau: 25000

CLOVERS:
Input: InputRange: 2V, Impedance: 50Ohm, Offset: 50000, Polarity: - (NEG)
Trigger: Fast filter IntTime: 20, FlatTop: 20, Threshold: 30
Trigger: GateLength: 750, PreTrigger: 75
Slow Filter: IntTime: 500, FlatTop: 50, Tau: 37000

Measurement with preamplifiers after drying.

Amplifiers are brought back after ~12h and connected.
Measurement of background for 1hour
Online: 160720_1350_1452_Bkg.root
Listmode: No

There might have been a slight improvement on the PA behaviour
but is not clear.

Attached a screen shot of the spectrum

The spurious signals show very little noise superimposed
as can be seen in the attached capture of the sample by the DACQ
but is not so obvious how this can help to veto them. 

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

Drying of preamplifiers

PA8, PA9 and PA10 are removed and brought to a dryer box
to stay overnight and see if the situation with spurious signals
improves as suggested by Mesytec.
Extra drying in the morning with a hair dryer.

Measurement of the 252Cf source at the central position

Efficiency and neutron-gamma correlations

Listmode: 160719_2233_252Cf_XX.dlt, Run: 029-030
Online: 160719_2233_252Cf_029_030.root

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

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

19/Jul/2016
Scanning of the efficiency as a function of longitudinal position

File:160719_BRIKEN_252Cf_XXmm_*.dlt
Online:160719_BRIKEN_252Cf_XXmm.root
Run: 011-025
Distances: -275,-175,-125,-75,-50.-25,+25,+50,+75,+125,+175,+225,+275,+375mm

Measurement with the source at the center

Listmode: 160719_BRIKEN_252Cf_009.dlt
Online: 160719_BRIKEN_252Cf.root

BRIKEN: 1.03697E7
Pulser: 5985

Rate: 17326 n/s

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.

First measurement with full 140 tube version 
of the BRIKEN neutron detector

Directory: /data/160716Test01/
Configuration: 160718Conf_BrikenFull.xlsx
File: 160718_FullBrikenFirstData_252Cf_002.dlt
Online: 160718_FullBrikenFirstData_252Cf.root

All tubes and channels working!

Sample of screenshots included.

Pulser settings

We use two pulsers, Pulser1 for RIKEN, ORNL1 and ORNL2 tubes (7 PA)
and Pulser2 for UPC tubes due to the different gains (3 PA)

10HzClock->G&DG->Pulser->LinearFI/FO

Pulser1: BNC BH-1: trise=1us, tfall=1ms, amp=670mV(scope), NEG
Pulser2: BNC PB-5: tfall=1ms, amp=0.180mV(setting), 90mV(scope), NEG 

Later on we found out that Pulser1 is compatible also for 
the CLOVER detectors (8PA). This will require an additional LinearFI/FO

Distribution of connections of tubes in preamplifiers and digitizers



Because of the need to use 10 PAs instead of 9 PAs we had to redistribute
the signal connections. Now: 
PA1(RIKEN), PA2(RIKEN), PA3(UPC), PA4(UPC), PA5(UPC) -> V1A1-V1A4  
PA6(ORNL1) -> V1A5
PA7(ORNL2) -> V1A6
PA8(ORNL2) -> V2A1,V2A2
PA9(ORNL2) -> V2A3,V2A4
PA10(ORNL2) -> V2A5,V2A6

So V1A1 to V1A4 contain now signals from 2 PAs.
We also redistributed the tubes within the PAs
We also changed the numbering or RIKEN Tubes. Tube 1 to 12 are now 
those on the AIDA side (PA1 attached to the PE block)

A figure showing the distribution of tubes an numbering is included.
Tube 1 is behind tube 19 and so forth.

Attached also is an excel file with tube-channel distribution

 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.