TIMING COUNTER: status report Giorgio CECCHET, PSI July 11th, 2003.

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Presentation transcript:

TIMING COUNTER: status report Giorgio CECCHET, PSI July 11th, 2003

Timing counter MC activities Tests on PM characteristics Preliminary results of May test Tests in magnetic field Possible new ideas on “transverse counter”

Montecarlo activities Reorganization of code repository Critical revision of TC code Rievaluation of main geometrical parameters of TC

Length 70 cm Angle (-140,10)° Radius

Tests on PM characteristics Basic tests on gain and TTS Photomultiplier used Hamamatsu fine mesh 1,5”, 19 dynodes H mod

MMICRO CHANNEL PLATE PMT Serial n.Q.E. % (500nm) V MCP (10^6) Noise (0.5 p.e.) ,22450V100kHz ,52160V140kHz Active diameter:20 mm Test wavelength 670 nm Ligh spot diameter8 mm

May 2003 test On May 2003 two scintillators (80x5x1) assembled with 1.5” and 2” PM’s and taken to  E5 area Aim: measure rough count rate in conditions similar to final

Main results Position similar to final in the Cobra (30 cm off beam axis) Rates: Beam off -> Bck: 25evs/s Beam on, no mu stopper -> 0.5 Mhz Beam on, with mu stopper -> 5 Mhz PMT saturation: 25Hz->10KHz : 1.8 V/pulse 20KHz: 1.7V/pulse 200KHz: 0.4 V/ pulse PMT with higher anode current are nedeed (2” PM better than 1.5”) Need to design a higher current voltage divider?

With collimated beam (10 mm dia.): measure of arrival time differences between 2 PMTs and calculation of time resolution FWHM using the formula: Sigma*2.35/sqrt(2) We obtain 175 ps FWHM for the single PMT, in absence of magnetic field.

Magnetic field tests One week ago magfield tests started Conventional magnet in LASA (Milan) with 12 cm headroom and field up to 1.2 Tesla water cooled

Setup used A very simple setup was used to take the light from a blue diode to the photocathode

New ideas Investigate the possibility of using a 5x5 mm2 APD from Hamamatsu to readout optical fibers as transverse (trigger) counter. Few samples made available from PSI and under investigation in Genoa

More work to be done Complete timing test on single PM in magnetic field Test scintillator coupled to PM’s in magfield (MARISA) Full testing of APD’s and optical fibers Exploit the full capabilities of fine mesh PM’s (new voltage divider?....) Engineering test of 3-4 scintillators and similar number of fibers during Oct-Nov beam time

Rotable support for 1-2 PMT/MCP for MARISA magnet under construction. B= T Measurement of single PMT parameters (gain/TTS vs B) at different angles with B 2-PMTs and scintillators assembly. B field measurements: planned form july 15 to 30

Not to mention work going on Helium bag!

Schedule We think now we do not have yet enough infos to make a correct choice of the PM to be used in the TC. We are confident that the new tests will lend us to a reliable decision.

Test Milestone AssemblyDesignManufactoring Design PMT EvaluationPMT