1. Progress on the beam tracking instrumentation Position measurement device Tests performed and their resolution Decision on electronics Summary

2. GIF++ Bunker Roof shielding of 0.8m concrete over the irradiation area 170m 2, GIF++ ~ 2 x GIF 100 GeV Muon beam 10 4 /spill in 10x10 cm 2 Beam tracking devices (4+4 planes of TGC’s) shielded

3. Test beam setup and mechanics Monitor chambers For external reference Needed to select parallel tracks sTGC quadruplets within the Mechanical frame. Allows to Adjust the quadruplet position

4. Arrangements of individual layers

5. DAQ and Online -Optical bridge -8 TMC (TDC) for the digital quadruplets readout and PMT timing -QDC for the analog readout of monitor chambers/quadruplets -New CAEN TDC (25ps resolution/32 entries) for digital quadruplets readout -New CAEN TDC (25ps resolution/16 entries) for LMU signal readout for combined runs with RPC. -Scaler -I/O for synchronization More than 100 runs (~2.5 Mevents recorded) One of the online screen

6. Resolution calculation strategy: Example of Gaussian fit: finding the his position in the TGC Linear fit of the trajectory using all 8 layers. Example at 10° inclination angle.

7. Individual resolutions using the TMC, QDC and TDC 1. TMC Using the beam, it is possible to see inner structure of the detector and to make detector alignment. By plotting the residual histogram between two layers for the different points along the quadruplet (2 nd coordinate movement of the quadruplet in the mechanical system) we get the z-shifts between the detectors within one quadruplets, we correct the z-coordinate shifts between two quadruplets, the 2-coordinate angle misalignment between two quadruplets. This procedure is repeated for each inclination angle point. Example: the relative shift between layers 1 and 2 within the quadruplet is ~184 µ. Stability problems with the TMC resolution measurements While in the first runs a good resolution of 96-105µ was acquired for each layer, after some time (a couple of days) the resolution deteriorated. The reason is yet unknown. The TMC resolutions after the deterioration are shown in the Table: Inclination angleAverage TMC resolution of the layers (µ) 0°110 5°128 10°154 15°140 20°160 25°180

8. Individual resolutions using the TMC, QDC and TDC 2. QDC Integrating the charge, better resolution values may be achieved. Also, at this resolutions a periodic structure of the detectors can be seen. Position of the hit in the detector Residual between two layers After correcting the differential nonlinearity effect one may be able to achieve the following local resolutions: Inclination angleQDC average resolution (µ) 0°55 5°70 10°104 15°120 20°156 25°157 As expected, the charge-calculated resolution is very sensitive to the inclination angle.

9. Individual resolutions using the TMC, QDC and TDC Summary on the resolutions and angular resolution vs. inclination angle angleTDC resolution (µ)QDC resolution (µ)TMC resolution (µ)angular resolution 0°105551100.52 mRad 5°120701280.51 mRad 10°104 1540.5 mRad 15°1351201400.51 mRad 20°1271561600.44 mRad 25°1501571800.52 mRad Angular resolution was calculated using the TMCs, as TDCs were connected only to one quadruplet Results and conclusions: 1)Very good QDC resolutions may be acquired if the proper differential nonlinearity correction or the change in the detector construction applied (smaller strips size, layers shifted by 1/3 of the strip etc.), resolution is sensitive to inclination angle. 2)Good and stable TDC resolutions. 3)Not well understood stability problems with the TMC resolutions. 4)The detectors are very uniform, all 8 have very similar resolutions and behavior. 5)Angular resolution ~0.5mRad at the distance 390 mm between two quadruplets.

10. Combined resolution of the quadruplet, the ratio between single layer and full quadruplet resolutions. The test has been performed proving that the combined resolution of the quadruplet is indeed 2 times better than the resolution of the single detector. 1) The residual between detectors 1 and 2 is plotted. 2) The residual between detectors 3 and 4 is plotted. 3) The residual between first and the second doublet (detectors12 – detectors34) is plotted. 4) The width of the doublets residual is compared with the single detectors residual. Example: detectors 1-2: residual σ = 138µ, residual detectors 12138µ detectors 34144µ double1 (12) - doublet 2 (34)99µ quadruplet1 - quadruplet2105µ

11. Additional checks: dependence of the resolution on the gas mixture, discriminator thresholds and the operating HV of the TGCs. Using the TDCs and the simple residual-between-two-neighbor-layers method, the resolution dependence on the system parameters have been checked. 1)Gas mixture tried in the test: a) Mixing at 15 degrees b) Mixing at 16 degrees c) Mixing at 17 degrees Result: no strong dependence of the detector resolution noticed 2) Discriminator thresholds on the strips tried in the test: a)40 mV b)80 mV c)130 mV Result: no strong dependence of the detector resolution noticed 3) The usual operating HV for the TGC chambers in the test was 3.0 kV. No HV trips were observed during the test. The resolution dependence on the HV for the different inclination angle is shown in the table: angle/HV3.0 kV2.9 kV2.8 kV 0°105130154 10°104127220 20°127142222

12. Further developments New FE electronics being developed by BNL New trigger electronics and read-out being developed for NSW-ATLAS, with demonstrator to be ready in October (Technion-Weizmann). After testing, the demonstrator could be used for GIF++. Depending on the development at BNL, one would either use old ATLAS-ASD or BNL-FE. One should be able to install system in GIF++ during 2014.