Yiftah Silver Tel Aviv University September 27 th 2012

 The university, people and the laboratory  Response to radiation Long exposure to the source Spatial resolution position scan  Proton Test beam The facility and set-up Results  Summary 9/27/ Outline

 Largest university in Israel  ~20 Experimental HEP faculty members taking part at (partial list): CERN: ATLAS at the LHC DESY:ZEUS Fermilab: SELEX ILC / CLIC Jefferson Lab SLAC: BaBarat 9/27/ Tel-Aviv University

The Tel-Aviv University PPS team  Professor Erez Etzion  Dr. Yan Ben-Hammou  Meny Ben-Moshe  Nir Guttman  Yiftah Silver 9/27/2012 4

Tel Aviv HEP laboratory 15 years of detectors R&D for High energy physics and the LHC Development and testing of the TGCs for the ATLAS experiment Development of the STGC for the ATLAS upgrade The lab is currently under construction, moving into a bigger room to better accommodate the test- bench, gas system, electronics etc.

Long duration exposure to Ru 106 source  The source is placed over the same area in the panel for 14 hours  Signals induced in the panel are counted Spatial resolution position scan  Moving the Ru 106 source in 1mm steps above the panel  In each position the source is left for a 5 minute measurement  From this measurement we can also see the pixels’ uniformity. 9/27/ Response to radiation

9/27/ Experiment setup Each RO line is X100 Attenuated Micrometer translation precision of collimated source Discriminator 10 Read Out lines VME V560 counter Panel fill: CF4 gas, 600 Torr R quench =20MΩ R out HV supply

9/27/ Source position Source sits here 1cm thick, Delrin collimator, with a 3 mm slit opening

9/27/ Long exposure to Ru-106 source  Collimated Ru 106 source placed above channel 7 for 14 hours  Minimal spreading to pixels far away from the source Elapsed time [min]

 One full turn moves the source by 1mm  16 measurements 5minutes each and 1mm apart. 9/27/ Position scan Illustration picture

9/7/2011 TAU - status report 11 49mm50mm51mm 52mm 53mm54mm55mm 56mm 60mm 59mm 58mm 57mm cpmcpm Channel 9/27/2012

12 Source position measurement  Gaussian fit results graph  X-axis relative distance to the first position  The electrode pitch in this panel (10 electrodes per inch) is the slope of this line: 0.4 electrodes per mm… Strip number vs. Micrometer position

9/27/ Panel uniformity  Each point is the total hit rate in the panel per minute Vs. the position of the source  Both source and collimator aperture size are larger than the electrode pitch

 Beam experiment was held at the ProCure facility in Illinois March 2012  IBA cyclotron accelerate protons to energies ranging from 70 to 250 MeV 9/27/ IBA Proton beam Proton beam tunnel Cyclotron

 Before the setup of the PPS test bench  Inside the patient room a computer controlled, robotic table with an XYZ translation system (six degrees of freedom) with a 0.1mm accuracy  A set of perpendicular lasers are being used in the room to show the position of the beam’s center path  A closer look at the proton delivery system 9/27/ The facility

9/27/ Set up  The panel was filled with 99% Ar and 1% CO2 at 600 Torr.  11 HV channels with 860 Volt each, separately quenched with a 200 resistor  17 channels read out with ATLAS modified MDT DAQ (Robert Ball’s presentation)  Trigger is the logical OR between all RO channels The panel

9/27/ The beam  The estimated beam current is about 1 nA with beam energy MeV, Gaussian distributed with 0.5 cm width  This correspond to proton rate larger than 1 GHz on the entire spread of the beam (13.3 cm)  The actual rate of protons from a 1mm hole in the center of the beam was measured to be about 2 MHz The panel

9/27/ Position scan  Two position scans 1cm steps - using a brass collimator with a 1cm diameter hole placed 2.5 cm away from the beam center 1mm steps with 1 mm diameter hole directly in the center of the beam  The table (the panel) is translated up-down by 1 cm (mm) between measurements, beam position is fixed The panel

9/27/ cm scan Number of hits per channel Reconstructed centeroid of the hit map Vs. the PDP relative displacement respect to the initial position

9/27/ mm scan Number of hits per channel Reconstructed centeroid of the hit map Vs. the PDP relative displacement respect to the panel’s initial position.

 Measurements at UM, TAU and at a test beam shows that the panel’s granularity can be exploited in order to detect stream of particles with sub-millimeter separation  The single channel response, up to the intrinsic (geometrical) limits of this device is demonstrated  At the proton test beam the panel successfully detect the position of a 1mm beam with very high intensity (~1MHz) 9/27/ Summary