CMS pixel telescope at MTEST

1. CMS pixel telescope at MTEST A. Kumar, S. Kwan, A. Prosser, R. Rivera, M. Turqueti, L. Uplegger

2. Motivations In the past months, the Detector Instrumentation Group (DIG) of Computing Division has been working at the construction of a pixel telescope for the MTEST facility. Since the CMS pixel community is already working at the phase 1 upgrade of the CMS detector, it was natural to unify the effort and provide a pixel facility for MTEST to test future detector prototypes. The idea was to build a telescope made of grade B modules rejected during the CMS pixel production. The modules we are using didn’t pass the High Voltage requirements of the LHC high radiation environment but, for testbeam purposes, they works very well. There was a free time slot before the shutdown and so we saw it as a good chance to to do a proof of concept building the telescope and testing one of the detector candidates for upgrade.

3. Testbeam schematic diagram DETECTOR UNDER TEST TELESCOPE PLANES SCINTILLATORS ACCELERATOR CLOCK BEAM CLOCK AND TRIGGER DISTRIBUTION 3.3V POWER SUPPLY TELESCOPE ENCLOSURE FERMILAB NETWORK CONTROL ROOM

4. The PSI46 pixel planes 2cm 4cm We used 2 different kind of modules made of 6 (2x3) and 8 (2x4) readout chips (ROCs). The overlap area between modules is about 2x2 cm2 Multichip module • Pixel size 100x150 um2. • Analog output digitized by DAQ ADC (12 bits). • Estimated resolution at the test beam with 4 planes (22 degrees) and 12 bits ADC is in between 3-4 um. No cooling required! The heat is dissipated on the carbon fiber

5. The CAPTAN DAQ system • The CAPTAN DAQ system has been developed by the DIG (Detector Instrumentation Group) of CD. There are 3 basic concepts behind the system: 1)Vertical standard bus 2)A set of core boards: NPCB – Node Processing and Control Board DCB – Data Conversion Board 3)Horizontal connectivity Gigabit Ethernet Link Interface Boards Level Translator USB • The software is a multithreaded application running on Windows also developed by the computing division DIG group

6. Fully assembled plane 2x3 Module 2x4 Module CAPTAN DAQ board • The 2x3 modules are oriented with the short pixel size measuring the Y coordinate • The 2x4 modules are oriented with the short pixel size measuring the X coordinate • The mechanics were designed by CM Lei and the modules were assembled by Bert Gonzales • at SiDet.

7. The diamond detector The detector covers just a small part of the readout chip which is a PSI46. It is a single crystal with cell size of 150x100 um2 Active Area The detector was borrowed from Rutgers University which has been testing it for the PLT (pixel luminosity telescope) for CMS.

8. Setup at MTEST Telescope Beam Diamond detector

9. Beamspot Diamond Detector

10. Coincidences Diamond Detector

11. 3D view

12. Plans • Data analysis is ongoing and soon we will have the results of the performance of • the diamond detector. • The analysis software which is currently under development will be part of • the testbeam package • To achieve a better tracking we will expand the telescope adding 2 more stations • We are also building a new modular mechanical box that will host the detectors • and electronics • When new prototypes will be available in the next months we will test them first • and then we’ll irradiate and test them again to see if they meet the requirements for • the SLHC upgrade • Many Universities are interested in joining this effort since the system is flexible • enough to easily test different kind of detectors