1. G. Ferioli, R. Jung - LHC-BI Review Workshop November 19&20 LHC Screen Profile Monitors G. Ferioli, R. Jung Introduction BTV LHC layout Monitor set-up Characteristics Data processing Conclusion

2. G. Ferioli, R. Jung - LHC-BI Review Workshop November 19&20 Introduction In the transfer channels of the SPS the main use of the screen monitors BTV was to observe qualitatively the beam position and shape. To perform profile measurements Secondary Emission Grids were used with a spatial resolution between 0.8 and 5 mm and a total number of 16 or 32 channels. In order to cope with the characteristics of the LHC beams a large number of channels and a high spatial resolution are required. With the use of different screen materials, image acquisition and processing software, the TV screens can be used for precision profile measurements.

3. G. Ferioli, R. Jung - LHC-BI Review Workshop November 19&20 BTV LHC layout

4. G. Ferioli, R. Jung - LHC-BI Review Workshop November 19&20 Monitor set-up Schematic view of the monitor set-up Monitor set-up

5. G. Ferioli, R. Jung - LHC-BI Review Workshop November 19&20 Main Characteristics Beams : Intensity min 5*10 9 p pilot pulse max 3.7*10 13 p 3 batches ultimate Dimensions min0.35 mm 1 sigma hor/vert max1.7 mm Screens : Material Thickness Profile 3*3mm 2 Light source Al 2 O 3 (Cr) 1mm >10 8 p Luminescence Titanium 12µm >10 11 p OTR Carbon 100µm >10 12 p OTR Detector : CCD camera 390 (hor) *290 (vert) pixels Multi-Anode PM 32 stripes (H or V) Optics: Focal length Image area Sampling 35 mm 38*28 mm 2 97 µm/pixel 50 mm 25*18 mm 2 64 µm/pixel 75 mm 15*11 mm 2 38 µm/pixel

6. G. Ferioli, R. Jung - LHC-BI Review Workshop November 19&20 TV data processing Horizontal and vertical profile 2-D view 3-D view Single bunch LHC 5*10 9 p in TT10

7. G. Ferioli, R. Jung - LHC-BI Review Workshop November 19&20 Turn-by-turn image processing for Matching

8. G. Ferioli, R. Jung - LHC-BI Review Workshop November 19&20 Fast data processing Block diagram of the fast readout electronics 3 –D view of 82 bunches

9. G. Ferioli, R. Jung - LHC-BI Review Workshop November 19&20 Conclusion Profile monitors already installed in the transfer line between the PS and SPS are currently used for the diagnostics of LHC type beams. With the use of two screens (Al 2 O 3 (Cr) and titanium) a very large dynamic range in intensity > 10 5 can be achieved. A spatial resolution up to 40µm can be obtained with a simple mechanical and optical set-up. The availability of 2-dimensional representations and a large number of points per projection are the major advantages of the BTV profile monitor. Single bunch to bunch profile measurements can be made with the use of OTR screens observed by a Multi Anode Photomultiplier. Question: are all foreseen screens to be kept?