The Optical Line for the Electron Spectrometer AWAKE Technical Board, 25/6/2015 1 B. Biskup, V. Clerc, L. Deacon, A. Goldblatt, L. Jensen, S. Jolly, S.

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Presentation transcript:

The Optical Line for the Electron Spectrometer AWAKE Technical Board, 25/6/ B. Biskup, V. Clerc, L. Deacon, A. Goldblatt, L. Jensen, S. Jolly, S. Mazzoni and M. Wing

Outline Spectrometer optical line layout and integration; Alternative optical line proposal; Optical line tests; AWAKE Technical Board, 25/6/2015 2

Spectrometer optical line Camera position: TSG4, ~17.4 m from scintillator screen; Baseline: reflective elements to ~350 mm camera lens – optical elements calculations ongoing; To be discussed: TSG42 safety exit? Lights (optical line completely enclosed)? AWAKE Technical Board, 25/6/ Sigma apo mm, F# Nikkor mm, F# 4 with optical coupler (available - BI)

Optical line layout AWAKE Technical Board, 25/6/20154 Scr/M 0 : 1 m M 1 : 93 cm M 2 : 43 cm Total length: 17.4 m Mirrors: Unprotected metallic coating; In contact with OptoSigma (custom made mirrors)

Optical line layout AWAKE Technical Board, 25/6/20155 Vincent Clerc EN/MEF

Alternative solution – optical fibres Pros: Higher light yield; Easier integration (compact solution); Could be used as scintillator (no need for the LANEX screen)? Cons: radiation degradation (high attenuation) – to be studied (plastics × quartz); challenging manufacturing, arrangement of array & fibre sampling; AWAKE Technical Board, 25/6/2015 7

Alternative solution – optical fibres AWAKE Technical Board, 25/6/ e - distribution Lawrence Deacon UCL 2D fibre array Linear array (integral) Example for Saint-Gobain BCF-12 (scintillating plastic fibre): ph/MeV (MIP) -4% trapping efficiency -Resulting in approx. 8 ph/particle -For 1 mm dia: 10^6 photons per fibre per bunch → Fibre bundle → Camera or In contact with Thomas Schneider from PH-DT

Light yield test Test of the LANEX scintillator light yield and camera; In PHIN (5 MeV e -, flux several orders of magnitude higher than foreseen in AWAKE – to be scaled); Several LANEX samples (10cm × 10cm) with different thickness; Andor iStar 340T camera with Nikkor mm lens, 17.4 m from the screen; Planned for August 2015; AWAKE Technical Board, 25/6/2015 9

Optical system test Test of optical resolution of the optical system vs. mirror quality; Several optical targets (black/white stripes) 0.5mm, 1mm, 2mm, 4mm, 8mm, 16mm stripes; Andor iStar 340T camera with Nikkor mm lens, 17.4 m from the target; Optical line with/without mirrors (of different quality, standard vs. laser quality); Planned for September/October 2015 in BI lab; AWAKE Technical Board, 25/6/

Optical system test - targets AWAKE Technical Board, 25/6/

Conclusions Discussion about optical line integration started, several tasks to be clarified; Optical line calculations ongoing; Feasibility studies of using optical fibres ongoing; Light yield and optical system tests in preparation for August-October; AWAKE Technical Board, 25/6/

Thank you for your attention AWAKE Technical Board, 25/6/