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FEL Beam Dynamics Seminar, 12. Januar 2007

Test-Measurements with Hamamatsu H6780 photomultiplier

Martin Sachwitz

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7 Wire Scanner Stations

(Hasylab-Zeuthen) in Undulator section

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Sensitivity with 1 pC charge

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Scintillator

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Fork with three wires

d = 10, 10, 50 m C, W, WZ = 12, 74, 74

22ZdAmplitude

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• BC-408 Premium Plastic Scintillator (BICRON)

• BC-408 is a blue-emitting plastic scintillator that is sensitive to protons and electrons as well as alphas, betas, gammas and neutrons. The bare scintillator glows blue when exposed to UV light from any source.

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Ultrahelle, blaue LED

Blau (470nm) Best.nr. 235-9900 3,40 €

Technische DatenIF (typ): 20mAIF (max): 30mAVF (typ): 3,6VVR (max): 5VVerlustleistung: 120mWBetriebstemperaturbereich: -20°C bis +80°Cblau weiss hell weissIntensität: 1000mcd 1910mcd 680mcdStrahlungswinkel: 10° 35° 70°

Blue LED

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• What can we do?

• Reduce size of scintillator

• Other location (side of undulator)

• Reduce amplification in electronics

• Cut some light guides

• Install gray filters

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