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LHC Screen Profile Monitors G. Ferioli , R. Jung

LHC Screen Profile Monitors G. Ferioli , R. Jung. Introduction BTV LHC layout Monitor set-up Characteristics Data processing Conclusion. 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.

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LHC Screen Profile Monitors G. Ferioli , R. Jung

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

  2. 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. G. Ferioli, R. Jung - LHC-BI Review Workshop November 19&20

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

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

  5. Main Characteristics Beams : Intensity  min 5*109p pilot pulse max 3.7*1013 p 3 batches ultimate Dimensions min 0.35 mm 1 sigma hor/vert max 1.7 mm Screens :Material Thickness Profile 3*3mm2Light source Al2O3(Cr) 1mm >108p Luminescence Titanium 12µm >1011p OTR Carbon 100µm >1012 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 mm2 97 µm/pixel 50 mm 25*18 mm2 64 µm/pixel 75 mm 15*11 mm2 38 µm/pixel G. Ferioli, R. Jung - LHC-BI Review Workshop November 19&20

  6. TV data processing Single bunch LHC 5*109 p in TT10 2-D view Horizontal and vertical profile 3-D view G. Ferioli, R. Jung - LHC-BI Review Workshop November 19&20

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

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

  9. 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 (Al2O3(Cr) and titanium) a very large dynamic range in intensity > 105 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? G. Ferioli, R. Jung - LHC-BI Review Workshop November 19&20

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