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February 28, 2016 21:30
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GEB Digitizer Notes (ANL vs LBL)
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| In the ANL data format, I observe that the hexidecimal divider 0xaaaaaaaa does not appear in the raw data format. | |
| e.g. | |
| ANL: | |
| 00000000: 0e00 0000 4000 0000 9c21 e6cc 8301 0000 ....@....!...... | |
| 00000010: 1810 0711 cce6 219c 7001 0183 99c9 0000 ......!.p....... | |
| 00000020: 0181 f385 0080 398e 0000 0000 c42b d4da ......9......+.. | |
| 00000030: 0000 2be6 0000 0000 2007 2019 200c 2023 ..+..... . . . # | |
| 00000040: 200e 0000 2003 2005 1ff9 1ff9 1fed 1ff6 ... . ......... | |
| 00000050: 0e00 0000 4000 0000 9215 eecc 8301 0000 ....@........... | |
| 00000060: 1810 0711 ccee 1592 7001 0183 219c 0200 ........p...!... | |
| 00000070: 0183 cce6 0080 3af1 0000 0000 a22b d48e ......:......+.. | |
| 00000080: 1598 2d98 0183 ccee 2004 2013 214e 215d ..-..... . .!N!] | |
| 00000090: 200e 2107 600e 600c 6010 6013 200d 200f .!.`.`.`.`. . . | |
| Whereas the LBL Gretina Mode3 data has them: | |
| 00000000: 0200 0000 2c00 0000 8219 c600 2100 0000 ....,.......!... | |
| 00000010: aaaa aaaa 200a 0715 00c6 1982 9fdc 0021 .... ..........! | |
| 00000020: 0000 51fb a015 0000 fd58 37fb 07ea da23 ..Q......X7....# | |
| 00000030: fffe fffb fffa fffb fffb fffd 0200 0000 ................ | |
| 00000040: 2c00 0000 8419 c600 2100 0000 aaaa aaaa ,.......!....... | |
| 00000050: 200a 0719 00c6 1984 72e6 0021 0000 4001 .......r..!..@. | |
| 00000060: 72c4 2a39 009a e801 0002 05c8 ffc3 ffc4 r.*9............ | |
| 00000070: ffc4 ffc2 ffc6 ffc4 0200 0000 2c00 0000 ............,... | |
| 00000080: 8a19 c600 2100 0000 | |
| Thus in GRUTinizer void TGEBMode3Event::BuildFragments(){ ... } | |
| the following line will not work for the ANL Mode3 data | |
| //header.GetLength() is number of 32-bit values, | |
| // and does not include the 0xaaaaaaaa separator. | |
| size_t body_size = header->GetLength()*4 + 4; |
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The GEB header (first 16 bytes) is in little endian, while the data from the digitizers is big endian.