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

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. Motivations 2

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

4 The PSI46 pixel planes Pixel size 100x150 um 2. 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. 2cm 4cm Multichip module 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 cm 2 No cooling required! The heat is dissipated on the carbon fiber

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

6 Fully assembled plane CAPTAN DAQ board 2x3 Module2x4 Module 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 um 2 Active Area The detector was borrowed from Rutgers University which has been testing it for the PLT (pixel luminosity telescope) for CMS.

Setup at MTEST Diamond detector Telescope Beam 8

Beamspot 9 Diamond Detector

Coincidences 10 Diamond Detector

3D view 11

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 12