G. Trad on the behalf of the BSRT team LHC BI 2015 summary 13/11/2015 2 G. Trad- LHC BI 2015 summary Introduction BSRI Hartmann Mask Conclusions and Outlook 3 G. Trad- LHC BI 2015 summary 4 HARTMANN MASK LINE BSRI 5 G. Trad- LHC BI 2015 summary Working Principle 6 G. Trad- LHC BI 2015 summary Working Principle Installed Mask 7 G. Trad- LHC BI 2015 summary 1 train of 144 bunches At Injection 8 G. Trad- LHC BI 2015 summary 2 train of 144 bunches At Injection 9 G. Trad- LHC BI 2015 summary 4 trains of 144 bunches At Injection 10 G. Trad- LHC BI 2015 summary 4 trains of 144 bunches At Flattop 0.5 ms exposure 11 G. Trad- LHC BI 2015 summary 4 trains of 144 bunches At Flattop 1 ms exposure 12 G. Trad- LHC BI 2015 summary 4 trains of 144 bunches At Flattop 3 ms exposure 13 G. Trad- LHC BI 2015 summary 4 trains of 144 bunches At Flattop 10 ms exposure 14 G. Trad- LHC BI 2015 summary No Additional Deformation of the extraction mirror linked to Intensity and number of bunches. While checking with Hartmann mask, Abort gap values are compromised. No possible conclusion on deformation linked to energy since SR enters the system with different angle. Studies working on absolute value of deformation of the mirror itself independent of SR. 15 Comparing BSRT optical system vs BSRI optical system (in imaging) N.B: BSRI system could be further optimized finding an optimum focusing point. However it requests additional calibration time Vertical Spread reflects the instrument precision G. Trad- LHC BI 2015 summary 16 Comparing BSRT optical system vs BSRI optical system (in imaging) N.B: BSRI system could be further optimized finding an optimum focusing point. However it requests additional calibration time BSRT BSRI H MAG:68.8 m/px 10.9 m/px LSF: m 348 m V MAG:76.4 m/px 10.7 m/px LSF: 228 m 293 m During last MD a performance comparison was foreseen between the NUV BSRT imaging and the visible one. Unfortunately was not successful. G. Trad- LHC BI 2015 summary 17 G. Trad- LHC BI 2015 summary Step 1: Waiting for the design of the double slits to be finalised produced and assembled assembly, we Installed only Slits allowing vertical beam size measurements. Laser Printed Slits on aluminium plate 18 G. Trad- LHC BI 2015 summary Step 2: Prototype of the new assembly installed for horizontal size measurement. A bit complicated with many degree of freedom and will be optimized 19 G. Trad- LHC BI 2015 summary Final Assembly: During Xmass Shutdown, will all be replaced by the final design 20 Vertical beam size measurement by interferometry Bunch 0 Bunch 1785 Data acquired at the end calibration studies (F-4513), with a small emittance bunch (0) and a blown up bunch (1785) Slit scan from D=3mm to D=21 mm G. Trad- LHC BI 2015 summary 21 Vertical beam size measurement by interferometry = 185/200 m Instead of = 320/450 m !!! G. Trad- LHC BI 2015 summary 22 BSRI not yet able to provide a beam size measurement Further studies are required to disentangle several effects on the visibility measurement (flatness of optics, slits parameter uncertainty, misalignment, out of focus) Hartmann Mask within the uncertainty of the technique showed no deformation of the mirror linked to the increase of beam intensity (bunch number) Investigating the possibility of extraction mirror deformation measurement (beam independent, multi layer coating dependent) G. Trad- LHC BI 2015 summary