Cherenkov counters detect the light emitted by charged particles passing through a medium when the velocity of the particle is greater than the velocity of light in the is possible to fill the detector with a gas, possibly under pressure, so that the detector will respond only to particles with velocities exceeding some minimum value.


Date Action
2015-08-18 Worked with the beam instrumentation people to change gas in the Cherenkov volumes
Achieved a vacuum of 10 mBar


There is a simple simulation of a gas volume in the BL4S SimulationSoftware. See SimulationSoftware#CherenkovCounter.


User instructions
Operational note
Secondary Beams for Tests in the PS East Experimental Area; Chapter 4.2.1

From the guide, Chapter 4.2.1, the geometry of the detector is given in drawing EP 82.550. The entry and exit windows are 0.6 mm Mylar and the PhotoMultiplierTube is model XP2020Q. This information was last updated in 1993, so it is uncertain if this is current.

Via Lau Gattignon: "The PMT is still the same type. The [mirror] is in fact 25 microns thick and mounted at 45 degrees (thus effectively 35 microns). It is made of AL or aluminised mylar. In both cases it is negligible compared to the other material (gas and vacuum windows)."

The mirror is Aluminium foil glued to a frame, the inside dimension of the frame is an ellipse 274 x 196mm. It is tilted to 45 on a fixture in the PMT bell.

XP2020Q Datasheet

Location of the T9 Cherenkov detectors


Technical Drawings

  • Cherenkov Drawings:
    CherenkovNotes.JPG CherenkovMirror.JPG CherenkovMidAssembly.JPG CherenkovEndAssembly.JPG

-- CandanDozen - 2015-03-18

Topic attachments
I Attachment History Action Size Date Who Comment
JPEGjpg CherenkovEndAssembly.JPG r1 manage 4530.5 K 2015-12-14 - 15:20 TimBrooks Cherenkov Drawings
JPEGjpg CherenkovMidAssembly.JPG r1 manage 5697.3 K 2015-12-14 - 15:20 TimBrooks Cherenkov Drawings
JPEGjpg CherenkovMirror.JPG r1 manage 6043.7 K 2015-12-14 - 15:20 TimBrooks Cherenkov Drawings
JPEGjpg CherenkovNotes.JPG r1 manage 5603.7 K 2015-12-14 - 15:20 TimBrooks Cherenkov Drawings
JPEGjpg Cherenkov_locations.jpg r1 manage 2464.3 K 2015-03-19 - 18:49 TimBrooks Annotated photo of Cherenkov detectors in T9 beamline
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Topic revision: r12 - 2015-12-14 - TimBrooks
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