Detailed information regarding the possible data types, as described by the GRETINA global event builder (GEB) global headers, is available for download (GEBHeaders.pdf). struct GEBHeader {
int32_t type;
int32_t length; /* length of payload following the header, in bytes */
int64_t timestamp;
}Type = 1: Decomposed GRETINA Data Decomposed GRETINA Data format, June 2012 - now: #define MAX_INTPTS 16
struct crys_intpts {
int type; /* as of June 2012: abcd5678 */
int crystal_id;
int num; /* # of interaction points from decomp, or # of nets on decomp error */
float tot_e; /* CC energy for the central contact selected for use in decomp (calibrated, and for 10 MeV CC channels, includes DNL correction. */
int core_e[4]; /* 4 raw core energies from FPGA filter (uncalibrated) */
long long int timestamp;
long long trig_time;
float t0;
float cfd;
float chisq;
float norm_chisq;
float baseline;
float prestep; /* avg trace value before step (baseline) */
float poststep; /* avg trace value after step (flat-top) */
int pad; /* non-0 with a decomp error, value gives error type */
struct {
float x,y,z,e; /* here e refers to the fraction */
int seg; /* segment number hit */
float seg_ener; /* energy of the hit segment */
} intpts[MAX_INTPTS];
};Type = 2: Raw GRETINA DataThis data type contains raw (Mode3) data output directly by the GRETINA digitizers. Each event corresponds to a single digitizer channel, and includes a header with timestamp and energy information, as well as a section of trace. The detailed format is presented as a block diagram below:The energy is a 24-bit 2's complement signed integer, and must be converted to a 32-bit signed integer before use. The detector ID is a compound word consisting of 4 bit-fields as follows: <5-bit detector #><2-bit crystal #><2-bit VME slot #><4-bit channel #> A sample code to unpack this data is included in the GEBHeaders.pdf file. Type = 3: Tracked GRETINA Data #define MAX_NDET 30
struct CLUSTER_INTPTS {
int valid;
int ndet;
int tracked;
float fom;
float esum;
int trackno;
int bestPermutation;
int processed;
struct {
float xx, yy, zz;
float edet;
int order;
long long int timestamp;
int shellHitPos;
int detno;
}intpts[MAX_NDET];
};Type = 4: BGS Raw DataThis data type contains the raw BGS data, which is a simple array of short integers, which is mapped simply to values read from the data acquisition. A parameter list, which simply provides a label to each short integer in the data array provides the framework to unpack the BGS data. The parameter list for the BGS data in the commissioning runs is in the .pdf document. Additional information regarding the BGS data structure can be obtained from H. Crawford (LBNL).Type = 5: S800 Raw DataThis data type contains the raw S800 data buffers. Description of the complete S800 raw data structure is available on the S800 wiki at https://groups.nscl.msu.edu/opdevtech/wiki/index.php/S800_data_formatType = 6: NSCL Non-Event DataThis data type contains NSCL non-event data structures, including beginning of run, end of run and scaler NSCL buffers, which are generated by the NSCL readout software. In general, the first 32-bit integers of the payload for a type 6 event will describe the buffer length in bytes, and the buffer packet type, in a RingItemHeader, defined as:typedef struct _RingItemHeader {
uint32_t s_size;
uint32_t s_type;
}Details regarding the definition of non-event data structures can be found in the NSCL documentation available at:http://docs.nscl.msu.edu/daq/ringbuffer/r17361.html, while the definition of the possible non-event data types is available at: http://docs.nscl.msu.edu/daq/ringtutorial/a1889.html. Type = 7: GRETINA Scaler DataThis data type contains GRETINA digitizer-level scaler information. These scalers are currently in the testing phase, and will be implemented once testing is complete.Type = 8: Bank 29 Raw GRETINA DataThis data type is structurally identical to type 2 (raw GRETINA, or mode3 data), but has been designated to exclusively identify data originating from Bank29 in the GRETINA DAQ. This is a single digitizer which is used to digitize signals from auxiliary systems which may be useful to improve the resolution of particle-gamma timing, for instance. A new type number was assigned to mark these data as being inappropriate for decomposition, and to funnel these data into the appropriate GRETINA output file.Type = 9: S800 Processed (Physics) DataThis data type contains post-processed S800 data, which contains the S800 parameters relevant to and required for particle identification (energy loss and time of flight information), and Doppler correction of GRETINA spectra (S800 angles and positions). This is the structure that can be used if GRETINA analysis and S800 analysis are treated somewhat independently, to be able to make the appropriate Doppler corrections and obtain the best possible GRETINA spectra. Data type was defined by D. Weisshaar (NSCL).struct s800_physicsdata {
int32_t type; /* defined as abcd1234 for indicating this (first) version */
float crdc1_x; /* crdc x/y positions, in mm */
float crdc1_y;
float crdc2_x;
float crdc2_y;
float ic_sum; /* ion chamber energy loss */
float tof_xfp; /* tof scintillator after the A1900 */
float tof_obj; /* tof scintillator in the object box */
float rf; /* cyclotron rf for tof */
int trigger; /* trigger register bit pattern */
/*------------------------------------------------------------------------*/
/* from here corrected values, extracted from data above */
/*------------------------------------------------------------------------*/
float ic_de;
/* tof values with corrections applied (from afp/crdc x) */
float tof_xfpe1;
float tof_obje1;
float tof_rfe1;
/* Trajectory information at target position calculated from a map and
afp/bfp/xfp/ycp. New map and you need to recalculate. */
float ata; /* dispersive angle */
float bta; /* non-dispersive angle */
float dta; /* dT/T, T = kinetic energy */
float yta; /* non-dispersive direction */
};Type = 10: Timestamped NSCL Non-Event Data Type = 11: GRETINA GEANT4 Simulation DataThis data type is reserved for simulation data for GRETINA as generated from the GEANT4 simulation of the array. Details on the data format and specifications are pending. This data type is controlled by Lew Riley (Ursinus College).#define MAX_SIM_GAMMAS 10
struct g4Sim_abcd1234 {
int type;
int num;
int full;
struct {
float e;
float x, y, z;
float phi, theta;
float beta
}g4Sim_emittedGamma[MAX_SIM_GAMMAS];
};Type = 12: CHICO Raw DataThis data type is reserved for raw data from the CHICO detector. Details on the data format are pending. This data type is controlled by T. Lauritsen (ANL).
As we don't want to press our luck, no real data will be assigned type 13. |
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