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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 medium.it 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.

Development

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

Simulation

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

Documentation

User instructions
http://sba.web.cern.ch/sba/Documentations/Eastdocs/docs/T9-Cerenkov-UG.pdf
Operational note
http://sba.web.cern.ch/sba/Documentations/Eastdocs/docs/Cerenkov.pdf
Secondary Beams for Tests in the PS East Experimental Area; Chapter 4.2.1
http://ps-div.web.cern.ch/ps-div/Reports/PA9321/Guide/Cerenkov.html

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)."

XP2020Q Datasheet
http://www2.fisica.unlp.edu.ar/blogs/tgc/XP2020Q-1.pdf

Location of the T9 Cherenkov detectors

Cherenkov_locations.jpg

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: r11 - 2015-12-14 - TimBrooks
 
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