slide1
Download
Skip this Video
Download Presentation
ITEP

Loading in 2 Seconds...

play fullscreen
1 / 13

ITEP - PowerPoint PPT Presentation


  • 117 Views
  • Uploaded on

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

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' ITEP' - destiny-britt


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

Development of

high rate RPCs

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

LIP(Coimbra), USC(Santiago de Compostela)

ITEP

slide2

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)

slide3

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).
slide4

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.

slide5

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.

slide6

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.

slide7

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 [!]

slide8

Efficiency measurements

Na22

Na22 + Co60

(2.5 cm further)

Na22 + Co60

slide9

Efficiency measurements

Increasing T

33 degrees

X12

slide10

Conclusions (I)

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

Geometric acceptance ≈ 87 %

T~20 degrees

slide11

Conclusions (II)

When the Temperature increases??

Rate capability

Under study!

measured

expected

slide12

Conclusions (III)

Geometric acceptance ≈ 87 %

for κ(T) measured

in 30 degrees increase

slide13

App1: Ageing

T increase of 30 degrees

ad