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Development of high rate RPCs. IHEP (Protvino), ITEP (Moscow), INR (Moscow), LIP(Coimbra), USC(Santiago de Compostela). ITEP. I. High rate capability of ordinary glass RPCs. Diego González Díaz (Santiago de Compostela-Spain). A. Blanco, P. Fonte, L. Lopes, R. Ferreira-Marques

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Development of

high rate RPCs

IHEP (Protvino), ITEP (Moscow), INR (Moscow),

LIP(Coimbra), USC(Santiago de Compostela)


I. High rate capability

of ordinary glass RPCs

Diego González Díaz

(Santiago de Compostela-Spain)

A. Blanco, P. Fonte, L. Lopes, R. Ferreira-Marques


Detector used for tests

  • Gas mixture: 80% C2H2F4 + 20% SF6 .

  • Normal window glass, 2 mm thick.

  • 4-gaps, 0.3 mm thick.

  • Aluminum electrodes, 2 mm thick.

  • Shielding boxes.

  • BGA2712 amplifier.

  • - Reference BICRON scintillator (110 ps for gammas).

Sources used for tests

Na22 (~ 0.1 mCi)(mainly used for calibration)

Na22 (~ 1 mCi)

Co60 (~ 1 mCi)

2 x 0.511 MeVcollinear (positron annihilation)

1.274 MeV

1.173 MeV, 1.332 MeV (opposite directions but not perfectly collinear)

Interaction occurs through Compton scattering in the electrodes. The electron scattered ionizes the gas and is detected. Charge distribution is different than for MIPS.

Trigger system used for tests

Efficiency trigger

Time resolution trigger

Coincidence with a 110 ps scintillator

self-trigger mode







Due to the high rate environment, coincidences by chance are dominant and must be suppressed with adecuate cuts.

Temperature dependence

As a first approach, if the

reduced high voltage V* is

kept constant

‘Rate capability’: If the rate capability κ(T) increases

a factor n, the rate can be increased by the same

factor and the performance of the detector

remains unaltered.

Time resolution measurements

Time resolution for gammas stands within 90 ps without significative dependence on primary rate. So it is hard to get the κ(T) factor from timing


No significative dependence [!]

Efficiency measurements


Na22 + Co60

(2.5 cm further)

Na22 + Co60

Efficiency measurements

Increasing T

33 degrees


Conclusions (I)

Results in Carbon 2GeV/A beam tests, for the same detector. April 2003

Geometric acceptance ≈ 87 %

T~20 degrees

Conclusions (II)

When the Temperature increases??

Rate capability

Under study!



Conclusions (III)

Geometric acceptance ≈ 87 %

for κ(T) measured

in 30 degrees increase

App1: Ageing

T increase of 30 degrees