STOF Sweep Voltage Description

STOF Parameters: (all values show default setting)

SW_GAIN_S = 78 Gainswitch STOF [Integer]
TS1 = 178 [Integer]
TS2 = (2 - LS3) ^{1 /2} = 0.9831 [Real]
TS3 = 21 TOF Offset [Integer]
AS1 = 3 upper limit of proton energy depending on PHA-step
ALS3 = 50 ^{1 /119} = 1.033420468 [Real]
AS4 = 0 ACCU Offset [Integer]
LS4 = 5 3 sigma noise (~30keV)
LS5 = 30 PHA-step [Integer]
LS6 = 1.70 fraction of threshold level

Condition
Gain_S
GAmpS
Swap_
Corr_S
Offset
ACCU_S
Offset
LS2
AS2
sp < LS5
0
1
0
20
LS1(0) =36
LS4
AS2(0) = 1023 ^*)
LS5 sp < SW_GAIN_S
0
1
0
20
LS1(0) =36
LS6 /GAmpS * ALS3^sp
AS1 /GAmpS * ALS3^sp
sp >= SW_GAIN_S
1
5.6
1
10
LS1(1) =30
LS6 /GAmpS * ALS3^sp
AS1 /GAmpS * ALS3^sp
^*) to be reprogrammed to 986 to avoid overflow by adding offset

STOF Thresholds depending on PHA-Step sp :
THRESHOLD TOF_S = INT (TS1 * TS2^sp + TS3 + 0.5)
THRESHOLD ACC_S = INT (AS2 + LS1 + AS4 + 0.5)
THRESHOLD LS = INT (LS1 + LS2 + 0.5)

HSTOF Parameters: (all values show default setting)

SW_GAIN_H = 78 Gainswitch HSTOF
TH1 = 21 TOF_Offset
TH2 = 25

Condition
Gain_H
GainAmpH
Swap_Corr_H
Offset ACCU_H
Thresh_ACC_H
Thresh_LH
Offset + Sigma Noise
sp < SW_GAIN_H
11 (bin)
16.7
1
4
AH(11) = 60
LH(11) = 28 High Energy
sp >= SW_GAIN_H
00 (bin)
1
0
10
AH(00) = 1023
LH(00) = 41 Low Energy

HSTOF Thresholds depending on GainAmpH :
THRESHOLD TOF_H = TH1 + TH2 = 21 + 25 = 46
THRESHOLD ACC_H = AH (GainAmpH)
THRESHOLD LH = LH (GainAmpH)

Condition	Gain_S	GAmpS	Swap_ Corr_S	Offset ACCU_S	Offset	LS2	AS2
sp < LS5	0	1	0	20	LS1(0) =36	LS4	AS2(0) = 1023 ^*)
LS5 sp < SW_GAIN_S	0	1	0	20	LS1(0) =36	LS6 /GAmpS * ALS3^sp	AS1 /GAmpS * ALS3^sp
sp >= SW_GAIN_S	1	5.6	1	10	LS1(1) =30	LS6 /GAmpS * ALS3^sp	AS1 /GAmpS * ALS3^sp

Condition	Gain_H	GainAmpH	Swap_Corr_H	Offset ACCU_H	Thresh_ACC_H	Thresh_LH Offset + Sigma Noise
sp < SW_GAIN_H	11 (bin)	16.7	1	4	AH(11) = 60	LH(11) = 28 High Energy
sp >= SW_GAIN_H	00 (bin)	1	0	10	AH(00) = 1023	LH(00) = 41 Low Energy