UPDATES ON THE WORK DONE ON THE MINI-TIME PROJECTION CHAMBER Mayra - PowerPoint PPT Presentation

UPDATES ON THE WORK DONE ON THE MINI-TIME PROJECTION CHAMBER Mayra Lopez-Thibodeaux 05-23-13

Trigger 2 Inside TPC Vessel Trigger =  A signal blob of electrons over threshold makes it to the FEI4  This tells the FEI4 system to read out this signal as an event Note that the chip will trigger even if a single pixel makes it over threshold. Then the surrounding pixels will be read out too.

Trigger Control in STControl 3 Trigger Control per run in Basic Par’s tab The trigger is control for every run by several functions in STControl at the Basic Par’s tab  under the PixScan Panel  “Trigger type” and “Type of event” count are important

Different External Trigger Set Ups Were Tried 4 The FEI4 internal trigger was set up Also, an external trigger externally by connecting it from the chip was set up to be done by board to the USBpix board’s ground and the scope connected to HitOr pins the x-ray signal

Event Trigger type Necessary in STControl 5 Internal self trigger source scan occupancy plot Internal self trigger source scan occupancy under data record event count (1 event at high rate) plot under trigger event count  With no trigger event count, data from more than one x-ray event might be gathered  The internal self trigger source scan under trigger type does not seem to follow the number of event count given, but keeps triggering until it is stopped

Testing of the FEI4 Internal Trigger 6 HitOr trigger signal on the scope The FEI4 being tested directly HitOr trigger being tested for 5 events  The test vessel was opened to test What 5 events should look like our FEI4 HitOr trigger directly  Its signal output was consistent with the tests done previously The HitOr from another FEI4 tested for five  We concluded this function of our events under gave a signal output on the scope FEI4 is broken similar to this picture

Solution: Integration of another FEI4 7 Side view illustration of the The Double GEM and FEI4 package at the bottom of the field cage detector package  The avalanche detector consisting of two GEMs in series above the pixel chip with thin insulating spacers in between GEMs and between the pixel chip and the bottom GEM will have to be taken apart  Another FEI4 will be mounted and wired bonded on our pixel chip board

Future Plans 8 External Trigger TESTBEAM_EUDAQ Source Scan  Data acquisition using the TESTBEAM external trigger source scan in STControl will be used  This scan does write the raw data  Most probably, the internal trigger will be set up externally by connecting it to the HitOr pin of the USBpix