BSO Beam Test

1>HV Settings 
Energy deposit classification


Front panel schematic diagram


2>Mappings

Channel	CH0	CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8
BSO #	03	11	01	07	08	10	02	06	04

Table 1: Mapping between crystal number and readout channel.

The crystal performance and PMT parameters are listed in the table below:

BSO #	01	02	03	04	10	06	07	08	11
LY[pe/MeV]	37.9	43.9	49.8	46.9	53.9	58.4	53.5	86.9	81.2
PMT #	1829	1847	1848	1833	1832	1845	1830	1843	1844
Gain HV=-800V	8.6e5	5.1e5	4.3e5	4.7e5	3.6e5	3.2e5	3.7e5	1.4e5	1.9e5

Table 2: Mapping of crystal number and PMT parameters.

BSO channel to QT board
QT board number : 0x13
beam direction:  out of the paper .

B1/ch0	B2/ch1	A2/ch2
A3/ch3	A4/ch4	A5/ch5
A6/ch6	A7/ch7	A8/ch8

3>DAQ System
3.1、 TEST system Layout

3.2 、DAQ System: QT Board


Trigger  Setting.

Trg = Sum(QT_channel) > Threshold.

3.3 Timing information from BC1 Discriminate signal.

Definition :
     deltaT = TriggerCrossing_fallling_edge - Trigger_Time

cuts : BC1 : Adc>100 BC2: Adc>50

3.4、Beam Profile information
The beam profile in low energy will be poor, here is an example shows the beam profile under 5 GeV and 3 GeV

Energy = 5GeV	Energy = 3 GeV

The Calorimeter was located at the downstream of MT6WC2. 

Energy	5GeV	3GeV
VERT Mean	1.29mm	1.129 mm
VERT Sigma	9.003mm	11.84 mm
HORZ Mean	1.76mm	1.515 mm
HORZ Sigma	10.63 mm	11.6 mm

More details can be found in FTBF website :
http://ppd.fnal.gov/ftbf/beam/energies.html

4、Cherenkov and BC timing information
x-axis :
bin 0 : Pre crossing
bin 1 : Trg crossing
bin2 : Post 1 crossing
bin3 : Post2 crossing
bin4 : Post3 crossing
bin5 : Post4 crossing
bin6 : Post5 crossing

Cherenkov Timing
BC timing

5>Analysis
5.1 Look at  Raw BSO signal
Run 15140012
Energy : 5 GeV
Cut        : no

a) Raw Adc in each channel (Adc = trg + pre + post1 + post2 + post3 )
b) Timming information  in each channel. X-axis: 0-Pre 1-Trg 2-Post1 3-Post2 4-Post3 5-Post4 6-Post5

5.2
Run 15140012
Energy : 5 GeV  
Cherenkov Adc :  Trg + pre + post1
BC Adc : Trg + pre + post 1 + post2

Cuts :
      a) Outer Cherenkov: Adc > 20
      b) BC1 : Adc > 100
      c) BC2 : Adc > 50
      d) Adc in each crossing < 4000

a) Raw Adc in each channel (Adc = trg + pre + post1 + post2 + post3 )
Sum All 8 channel 【Channel 5 is ok, A6/Ch6 was dead】

5.3 Calibration

5.3.1 Select Cosmic ray events
The beam from FTBF will be repreat in every 60s, in each cycle , only about 4 seconds will have beam,  the remain 56 seconds will be cosmic ray events.   each cycle then call it a "spill"

below plots shows the beam structure.


you will see 25 spills in this run.

5.4 Energy resolution

Energy 5 GeV Cuts :            b) BC1 : Adc > 100       c) BC2 : Adc > 50       d) Adc in each crossing < 4000	Energy 3 GeV Cuts :             b) BC1 : Adc > 100       c) BC2 : Adc > 50       d) Adc in each crossing < 4000	Energy 2 GeV Cuts :             b) BC1 : Adc > 100       c) BC2 : Adc > 50       d) Adc in each crossing < 4000	Energy 1GeV Cuts :          b) BC1 : Adc > 100       c) BC2 : Adc > 50       d) Adc in each crossing < 4000

Raw Energy resolution[ didn't consider about the beam momentum resolution .]





6>Work dir
/star/u/zhoulong/data02/crystal/BeamTest/FTBF/ana/LesRoot

Raw Energy Resolution
/star/u/zhoulong/data02/crystal/BeamTest/FTBF/ana/LesRoot/EnergyResolution/EnergyResolution.root

7>Data List

Run Number	x[mm]	y[mm]	NEvents
15137059	1329	36
15137061	1329	36	300k
15137062	1329	32	120k
15137063	1324	32	300k
15138011	1329	42	294k
15138012	1329	39	294k
15138013	1326	36	300k
15138014	1323	36	300k
15138015	1332	36	287k
15138016	1336	36	247k
15138017	1329.7	30	255k
15139006	1353	54	97k
15139007	1353	54	6k
15139008	1396	203	300k
15139010	1396	203	182k
15139011	1396	203	80k
15139012	1396	203	150k
15139013	1396	203	80k
15139014	1396	203	165k
15139015	1396	203	142k
15139016	1396	203	90k
15139017	1396	203	90k
15139018	1396	203	99k
Energy Scan
15140011 [5GeV]	1334	32
15140012 [5GeV]	1332	32	286k
15140013 [3GeV]	1332	32	287k
15140014 [3GeV]	1327	27	111k
15140015 [2GeV]	1332	31.8	296k
15140016 [1GeV]	1332	31.8	179k
15140017 [1GeV]	1332	31.8	67k

Reference:
[1] Les's email :

QT data for one channel have 12 bits

Array qt(i,j,c)
   i - channel number on board [for PAW, from  1 to 32
                                for root, from 0 to 31]
   j - board number            [for PAW, from  1 to 24
                                for root, from 0 to 23]
   c - crossing number
       [for PAW, 1-> triggered; 2-> pre ; 3 -> post]

[2] Cherenkov pressure information
https://drupal.star.bnl.gov/STAR/system/files/cerenkov_pressure.xls

[3] Master mapping sheet
https://drupal.star.bnl.gov/STAR/system/files/master.20150520.xls