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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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Itep

Development of

high rate RPCs

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

LIP(Coimbra), USC(Santiago de Compostela)

ITEP


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

(LIP-Coimbra)


Itep

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).


Itep

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.


Itep

Trigger system used for tests

Efficiency trigger

Time resolution trigger

Coincidence with a 110 ps scintillator

self-trigger mode

scintillator

RPC

RPC

source

source

L

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


Itep

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.


Itep

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

measurements.

No significative dependence [!]


Itep

Efficiency measurements

Na22

Na22 + Co60

(2.5 cm further)

Na22 + Co60


Itep

Efficiency measurements

Increasing T

33 degrees

X12


Itep

Conclusions (I)

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

Geometric acceptance ≈ 87 %

T~20 degrees


Itep

Conclusions (II)

When the Temperature increases??

Rate capability

Under study!

measured

expected


Itep

Conclusions (III)

Geometric acceptance ≈ 87 %

for κ(T) measured

in 30 degrees increase


Itep

App1: Ageing

T increase of 30 degrees


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