Structure of the list-mode-data written by MBS (up to March 2010)

(latest version)

One List-Mode-Data readout event contains several trigger events. The number of these trigger events is adjustable by the v1495_trig_scal value of the V1495 FPGA Trigger Logic and can be 1 up to 32.
Each readout event consists of two subevents distinguishable by the processor ID: One subevent for the Plastic Scintillator Setup (ProcID=1) and one for the BaF₂-Array (ProcID=2).

The sub events structure depends on the electronics schema used but consists of a number of 32 bit long data words. The type of word is identified by the 5 highest bit the so called GEO. Depending on this GEO the meaning of the different lower bits is shown in the list below.

An Example for a List-Mode-Data event can be found here.

The single Data words have the following bit-structure:

Time:

GEO = 0
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
0	0	0	0	0	0/1	Time / 100 ms

Bit 26 is 0 for real time and 1 for live time

real and live time are written once only after the stop acquisition signal (trigger type 15) as an end of acquisition flag

Time Flag:

GEO = 1
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
0	0	0	0	1	0/1	Time Flag / ms

Bit 26 is 0 for time flag from Plastic-Setup and 1 for time flag from BaF2-Array

the time flag is written as a header for the scaler data block and gives the time between each scaler readout

Scaler Values (SIS 3820 VME Scaler):

GEO = 2, 3, 4
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
0	0	0	1	0	Channel					Resol. R				Counts ( right shifted by R bits)

GEO is 2 for the Scaler of the Plastic-Setup and 3 and 4 for the BaF2-Array

Scaler ch	Scaler 2	Scaler 3	Scaler 4
0	Coincidence 1	BaF DAQ ch 1	BaF DAQ ch 17
1	Coincidence 2	BaF DAQ ch 2	BaF DAQ ch 18
2	Coincidence 3	BaF DAQ ch 3	BaF DAQ ch 19
3	Coincidence 4	BaF DAQ ch 4	BaF DAQ ch 20
4	Coincidence 5	BaF DAQ ch 5	BaF DAQ ch 21
5	N.C.	BaF DAQ ch 6	BaF DAQ ch 22
6	Accelerator	BaF DAQ ch 7	BaF DAQ ch 23
7	N.C.	BaF DAQ ch 8	BaF DAQ ch 24
8	HPGe	BaF DAQ ch 9	BaF DAQ ch 25
9	FC SCA	BaF DAQ ch 10	BaF DAQ ch 26
10	FC CFD	BaF DAQ ch 11	BaF DAQ ch 27
11	Pulser	BaF DAQ ch 12	BaF DAQ ch 28
12	ADC words	BaF DAQ ch 13	BaF DAQ ch 29
13	LMD words	BaF DAQ ch 14	BaF DAQ ch 30
14	TDC words	BaF DAQ ch 15	BaF DAQ ch 31
15	QDC words	BaF DAQ ch 16	BaF DAQ ch 32
16	Start of Readout	Start of Readout	BaF DAQ ch 33
17	Trigger	Trigger	BaF DAQ ch 34
18	N.C.	Downscaled Trigger	BaF DAQ ch 35
19	Plastic DAQ ch 1	nDet OR	BaF DAQ ch 36
20	Plastic DAQ ch 2	BaF OR	BaF DAQ ch 37
21	Plastic DAQ ch 3	Majority	BaF DAQ ch 38
22	Plastic DAQ ch 4	N.C.	BaF DAQ ch 39
23	Plastic DAQ ch 5	N.C.	BaF DAQ ch 40
24	Plastic DAQ ch 6	N.C.	BaF DAQ ch 41
25	Plastic DAQ ch 7	N.C.	BaF DAQ ch 42
26	Plastic DAQ ch 8	N.C.	N.C.
27	Plastic DAQ ch 9	N.C.	N.C.
28	Plastic DAQ ch 10	QDC words	N.C.
29	N.C.	LMD words	N.C.
30	10 MHz-Pulser real	10 MHz-Pulser real	N.C.
31	10 MHz-Pulser live	10 MHz-Pulser live	N.C.

for the DAQ channels cf. cabeling scheme

BaF ADC Header (CAEN V874B Calorimeter Readout Unit):

GEO = 11 ... 21, 22 ... 24					2
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
0	1	0	1	1	0	1	0	Crate no.										memorized Ch.

GEOs 22-24 are from Plastic-Setup and 11-21 from BaF2-Array

BaF ADC Data:

GEO = 11 ... 21, 22 ... 24					0
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
0	1	0	1	1	0	0	0			Channel								UN	OV	Measurement

ADC Output Channel	Data		ADC Output Channel	Data
8	LGS 1		18	TAC 3
9	SGS 1		19	TAC 4
10	LG 1		20	LGS 3
11	SG 1		21	SGS 3
12	LGS 2		22	LG 3
13	SGS 2		23	SG 3
14	LG 2		24	LGS 4
15	SG 2		25	SGS 4
16	TAC 1		26	LG 4
17	TAC 2		27	SG 4

LGS	...	long Gate, high gain;	SGS	...	short Gate, high gain;	LG	...	long Gate;	SG	...	short Gate;
the numbers name the coresponding ADC Input Channel (see below)

ADC Input Ch	GEO
	11	12	13	14	15	16	17	18	19	20	21
1	ch 1	ch 5	ch 9	ch 13	ch 17	ch 21	ch 25	ch 29	ch 33	ch 37	ch 41
2	ch 2	ch 6	ch 10	ch 14	ch 18	ch 22	ch 26	ch 30	ch 34	ch 38	ch 42
3	ch 3	ch 7	ch 11	ch 15	ch 19	ch 23	ch 27	ch 31	ch 35	ch 39
4	ch 4	ch 8	ch 12	ch 16	ch 20	ch 24	ch 28	ch 32	ch 36	ch 40

ch #  means the BaF DAQ channel # (cf. cabeling scheme)

BaF ADC Trailer:

GEO = 11 ... 21					4
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
0	1	0	1	1	1	0	0	Event Counter

TDC Data (CAEN V1190A 128 Channel Multihit TDC):

GEO = 6, 7					1
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
0	0	1	1	0	1	Channel							Measurement

GEO is 6 for the Scaler of the Plastic-Setup and 7 for the BaF2-Array

TDC Channel	TDC 6	TDC 7
0	Trigger	Trigger
1 ... 14	N.C.	N.C.
15	Accelerator	Accelerator
16 ... 19	N.C.	N.C.
20	Pulser	N.C.
21 ... 31	N.C.	N.C.
32 ... 47	N.C.	BaF DAQ ch 1 ... 16
47 ... 63	N.C.	N.C.
64	Plastic DAQ ch 1	BaF DAQ ch 17
65 ... 67	N.C.	BaF DAQ ch 18 ... 20
68	Plastic DAQ ch 2	BaF DAQ ch 21
69 ... 70	N.C.	BaF DAQ ch 22 ... 23
71	Plastic DAQ ch 3	BaF DAQ ch 24
72 ... 74	N.C.	BaF DAQ ch 25 ... 27
75	Plastic DAQ ch 4	BaF DAQ ch 28
76 ... 77	N.C.	BaF DAQ ch 29 ... 30
78	Plastic DAQ ch 5	BaF DAQ ch 31
79	N.C.	BaF DAQ ch 32
80	Plastic DAQ ch 6	N.C.
81 ... 82	N.C.	N.C.
83	Plastic DAQ ch 7	N.C.
84 ... 86	N.C.	N.C.
87	Plastic DAQ ch 8	N.C.
88 ... 89	N.C.	N.C.
90	Plastic DAQ ch 9	N.C.
91 ... 93	N.C.	N.C.
94	Plastic DAQ ch 10	N.C.
95	N.C.	N.C.
96 ... 97	N.C.	BaF DAQ ch 33 ... 34
98	Fission Chamber	BaF DAQ ch 35
99 ... 105	N.C.	BaF DAQ ch 36 ... 42
106 ... 124	N.C.	N.C.

for the DAQ channels cf. cabeling scheme

TDC Trailer:

GEO = 6, 7					0
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
0	0	1	1	0	0	Status										Word Counter

QDC Data (CAEN V792 32 Ch QDC):

GEO = 8, 9, 10					0
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
0	1	0	0	0	0	0	0				Channel							UN	OV	Measurement

QDC channel	QDC 8	QDC 9	QDC 10
0	Plastic DAQ ch 1	Plastic DAQ ch 2	Analog Sum
6	Plastic DAQ ch 3	Plastic DAQ ch 4	N.C.
2	Plastic DAQ ch 5	Plastic DAQ ch 6	N.C.
8	Plastic DAQ ch 7	Plastic DAQ ch 8	N.C.
4	Plastic DAQ ch 9	Plastic DAQ ch 10	N.C.

for the DAQ channels cf. cabeling scheme

QDC Trailer:

GEO = 8, 9					4
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
0	1	0	0	0	1	0	0	Event Counter

 

ADC Header (used with Cf- and U-Fission Chamber):

GEO = 5																1
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
0	0	1	0	1												1	memorized Ch. - 1			Event Counter

 

ADC Data (used with Cf- and U-Fission Chamber):

GEO = 5																0
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
0	0	1	0	1												0	Channel			Measurement

 

OPC Data:

GEO = 26
31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
1	1	0	1	0	N = number of OPC data words following

Subsequent to this single data word N further words are following. Each word contains only one 32 bit value. Note, that the order of the bytes of these words has to be swapped. The meaning of each value is as follows:

consecutive number	Value	Formula value = f(word content)
1	LA1-RC.01	content * 12.5E-3 keV
4	LA1-RC.11	content * 12.5E-3 keV
7	I-Cath	content * 1 uA
10	Macropulse Duration	content * 4E-2 us
13	Macropulse Period	content * 1E-1 ms
16	CW Operation	content / 0xffff
19	BPM04 - X	content * 1 um
22	BPM04 - Y	content * 1 um
25	BPM04 - I	content * 1 uA
28	I-NL-MD.02	content * (-6E-5) A
31	I-NL-MD.03	content * (-6E-5) A
34	Shutter 123 Pos 1	content / 0xffff
37	Shutter 123 Pos 2	content / 0xffff
40	Shutter 123 Pos 3	content / 0xffff
43	Shutter 123 Pos 4	content / 0xffff
46	Shutter 123 Pos 5	content / 0xffff
49	Shutter 111c Open	content / 0xffff
52	Shutter 111c Closed	content / 0xffff
55	DCM13 - I	content * 1 uA

After each of the words described in the table above, two words  are following, containing the update time of each value.