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Use of Beam Loss Monitor type detectors in CNGS muon station. Talk overview. 1. Muon monitoring at CNGS. 2. Beam Loss Monitor (BLM) as muon detector at CNGS. 3. Summary. Decay pipe. Hadron stop.  detectors. SEM foils. Proton beam. Target. Horn. He tube. Reflector. He tube.

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Presentation Transcript
slide1

Use of Beam Loss Monitor type detectors

in CNGS muon station

Valeri Falaleev & Gianfranco Ferioli

slide2

Talk overview

1. Muon monitoring at CNGS

2. Beam Loss Monitor (BLM) as muon detector

at CNGS

3. Summary

Valeri Falaleev & Gianfranco Ferioli

slide3

Decay pipe

Hadron stop

 detectors

SEM foils

Proton

beam

Target

Horn

He tube

Reflector

He tube

Fe

C

2.7

43.4m

100m

5m

1092m

18m

5m

67m

x105

2

 Muon fluxes 1.5x104 – 4.5x107 p/cm2

  • Burst duration 10.5 s
  • Time between 50 ms / 6 s
  • bursts

x107

2

 / 1013pot / cm2

 / 1013pot / cm2

x-slice (m)

Original proposal

x-slice (m)

A system based on a set of fixed

and movable SSD’s

(like at WANF).

Muon monitoring at CNGS

Main beam parameters

Valeri Falaleev & Gianfranco Ferioli

slide4

Muon monitoring at CNGS (2)

Valeri Falaleev & Gianfranco Ferioli

slide5

Muon monitoring at CNGS (3)

CNGS features and special requirements

•No access to the muon chambers during the runs,

minimal number of accesses during the shutdowns

=> detectors should be very reliable

Valeri Falaleev & Gianfranco Ferioli

slide6

Muon monitoring at CNGS (4)

> 500 m

Valeri Falaleev & Gianfranco Ferioli

slide7

Muon monitoring at CNGS (5)

CNGS features and special requirements

• No access to the muon chambers during the runs,

minimal number of accessesduring the shutdowns

=> detectors should be very reliable

• The detectors and electronics are separated by the distance of more then 500 m.

=> detectors signal should be high

Valeri Falaleev & Gianfranco Ferioli

slide8

Muon monitoring at CNGS (6)

 / 1013pot / cm2

 / 1013pot / cm2

Aligned case

Mis-aligned case

Valeri Falaleev & Gianfranco Ferioli

slide9

Muon monitoring at CNGS (7)

CNGS features and special requirements

• No access to the muon chambers during the runs,

minimal number of accessesduring the shutdowns

=> detectors should be very reliable

• The detectors and electronics are separated by the distance of more then 500 m.

=> detectors signal should be high

• No significant changes in the  event rate at Gran Sasso even for important

misalignment of beam elements or mis-steering of the beam.

=> detectors resolution can be moderate

• Flux variation is smooth. No need for absolute flux measurement.

=> detectors can be big in transversal direction

• Cost limitation.

=> detectors should be as cheep as possible

Valeri Falaleev & Gianfranco Ferioli

slide10

Construction

5 6

Filled with 99.9% N2 at about 1.1 bar

Active volume is 1250 cm2

92

All isolation is

done from ceramic

Signal electrodes

Bias voltage 800 – 1200 V

BLM as muon detector (1)

General parameters

• sealed ionisation chamber.

• widely used at CERN last 30 years.

• there are about 300 BLMs around the SPS and about 3000

new BLMs will be fabricated for LHC

Valeri Falaleev & Gianfranco Ferioli

slide11

BLM as muon detector (2)

Valeri Falaleev & Gianfranco Ferioli

slide12

BLM as muon detector (3)

HV and electronics

1M

+ 1000V

2.2 F

• collected charge is 10 times more then for SSD

• 18 channels (twisted pairs) signal cable up to 1500m length

• read-out is sincronized with 50 Hz

• common HV powers supply for all chambers

• well developed shielding scheme

• a few % long term stability calibration with 127Cs (3 mCi) source

Valeri Falaleev & Gianfranco Ferioli

slide13

BLM as muon detector (3)

Preliminary linearity test

  • 2.5 s slow extraction
  • flux from 102 to 105 p/cm2
  • 50/50 mixture of 120 Gev protons

and pions

Target

Proton

beam

Proportional Ionisation

Chamber

(PIC)

Scintillator + PM

BLM

Collimator

Valeri Falaleev & Gianfranco Ferioli

slide14

• linearity at highest intensity (4.5x107 p/cm2 for nominal CNGS beam)

- space charge limit at 4 x 107 p/cm2 (6mm gap, 1kV)

BLM as muon detector (4)

Week points of BLM

- not optimized detector construction

Possible solutions: better design of new LHC BLM,

calibration with reference chamber

• a bit much of material: difficulties for calibration and beam scan

Possible solutions: better design of new LHC BLM

Valeri Falaleev & Gianfranco Ferioli

slide15

Summary

The Beam Loss Monitor is a suitable device for

CNGS muon monitoring station and can be used

as both fix and movable detector.

Further design work on new BLM and study of

chamber characteristics are needed.

Valeri Falaleev & Gianfranco Ferioli

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