Download GTPC decoding Zoltán Fodor

GTPC decoding
Zoltán Fodor
KFKI – Research Institute
for Particle and Nuclear Physics
• The problem was:
– No hit in the simulated GTPC hits in the 3. 4. 7.
padrows
– After some error ignorance I could see only the
first pad hits with om
12.10.2010
Zoltán Fodor – NA61 Collaboration meeting
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• In the GTPC we have 7x96 pad, but we are using the
VTPC or HR configuration on MB readout.
 padrow #1 contains information of 1. and 3. padrow
padrow #2 contains information of 2. and 4. padrow
padrow #3 contains information of 5. and 7. padrow
padrow #4 contains information of 6. padrow
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d) PADR
The TPCs are numbered from 1 to 4 in order VTPC1, VTPC2, MTPCL and MTPCR.
The sectors in each TPC are numbered from 1 to 6 (VTPC) and 1 to 25 (MTPC) with the
convention that sector 1 in each TPC is upstream and towards the Jura. Numbering always
increases in the direction of increasing z (i.e. in the beam direction.)
Pads are numbered from 1 to 192 (VTPC and HR sectors in MTPC, i.e. 20-25 for MTPCL
and 1-5 for MTPCR) and 1 to 128 elsewhere. Pad numbers increase from Saleve to Jura.
In the case of VTPC1, not all pads are instrumented.
The BOS bank numbers are constructed from the TPC number, the sector number and the pad
row number as follows:
The PADR BOS bank number is then:
TPC# * 216 + Sector# * 28 + padrow#
The definition of the PADR bank is thus:
word 1 bank name PADR
2 bank number (See definition above)
3 reserved 0
4 number of data words following n
data The data are organised in bytes, padded with zeroes to fill n
integers as necessary.
byte 1 pad number (high byte: will be zero)
2 pad number (low byte: in range 1 to 192)
3 status: bit 0: data are compressed (status=1)
bit 1: data are not compressed (status=2)
bit 2: gain calibrated data (status=5 or 6)
Bit 3: t256 timeslices mode
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12.10.2010
a) for uncompressed data, (status=2) 512 bytes of time information follow and then the
structure is repeated with the next pad number.
b) for compressed data, (status =1) the data are as follows1
byte 4 0
5 0£repeat count £ 255: the number of additional zeroes
6 hit: 8 bits of ADC time bucket information
7 to n further hits. this sequence ends when the next zero is
encountered
n+1 0 end of sequence of hits
n+2 0:£ repeat count: £ 255: the number of additional zeroes
n+3 further hits. this sequence ends when the next zero is
encountered
This sequence continues until all 512 time buckets have been accounted
for from the current pad. At this point a new pad number will follow:
byte m pad number (high byte: will be zero)
m+1 pad number (low byte: in range 1 to 192)
m+3 status
Zoltán Fodor – NA61 Collaboration meeting
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• a) for uncompressed data, (status=2) 512 bytes of time information follow and
then the
• structure is repeated with the next pad number.
• b) for compressed data, (status =1) the data are as follows1
• byte 4 0
• 5 0£repeat count £ 255: the number of additional zeroes
• 6 hit: 8 bits of ADC time bucket information
• 7 to n further hits. this sequence ends when the next zero is
• encountered
• n+1 0 end of sequence of hits
• n+2 0:£ repeat count: £ 255: the number of additional zeroes
• n+3 further hits. this sequence ends when the next zero is
• encountered
• This sequence continues until all 512 time buckets have been accounted
• for from the current pad. At this point a new pad number will follow:
• byte m pad number (high byte: will be zero)
• m+1 pad number (low byte: in range 1 to 192)
• m+3 status
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Zoltán Fodor – NA61 Collaboration meeting
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• In the om, the format taken from data, no
parameter at startup
• The dipt has a parameter to force the t256 mode
• After adding this “t256” bit to the MC data I can see
with om the simulated tracks correctly
• Modification in the MTSIM/src/bos.c and
GTEMBED_GTPC/src/gtembed.c
• Reordering the GTPC data in: MTSIM/src/sim.c
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