Rad Hard Detectors for Accelerator Instrumentation · • Rad Hard (Φ > 1015 Particles/cm2; 50...

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Rad Hard Detectors for Accelerator Instrumentation 4/19/19 R.J.Tesarek

Transcript of Rad Hard Detectors for Accelerator Instrumentation · • Rad Hard (Φ > 1015 Particles/cm2; 50...

Rad Hard Detectors for Accelerator Instrumentation

4/19/19 R.J.Tesarek

Booster Fast Loss Monitors (FLM)

2

magnet 5-3

collimator 6B

notch losses persist 250μs notch

booster cycle

magnet 5-3

collimator 6B

notch

booster cycle

1 revolution

Notcher Absorber

3 RF buckets each

RF buckets

maximum deflection allowed by gradient magnet aperture

central orbit“notched orbit”

remnant RF buckets

Advanced design scintillation counters• Single RF bucket resolution• Desensitized to activation

Uses:• Tune notch formation kicker parameters (oscilloscope)• Monitor loss rates continuously for critical booster events:

injection, notch formation, transition, extraction, etc. (ACNET)

Example: Notch formation losses:• Remnant RF buckets persist after notching

R.J. Tesarek 11/23/15PIP Workshop

Booster Cycle Fast Losses 11/13/15

3

magnet 5-1

collimator 6A

collimator 6B

collimator 7

1 Booster Cycle

injection

notch formation

extraction

transition crossing

Accelerator Physics & Machine Performance

Ideal detector: • Fast (signal rise time 5ns or less) • Local gain (non-electronic) • Rad Hard (Φ > 1015 Particles/cm2; 50 MRad)

PMT + plastic scintillator works well with caveats • borosilicate glass (rad soft) • Most optical cements very rad soft (Below)

Pursue alternate detectors with above • Micro-channel plate devices without optical windows

show some promise (secondary emission) • Red scintillators

Optical cements exhibit radiation damage earlier than other material in optical systems; weak link in optical systems.

• Samples are 9 mm thick • Exposure to mixed radiation field • Measure transmission spectra • Quote wavelength for 50% transmission

Identified rad tolerant industrial epoxy • Yellowing partially due to aging in the first 2-3

weeks after sample preparation. • Cost ~ 10% of traditional optical cements • Publication in preparation for submission to JINST

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Detector R&DUnirradiated Irradiated

(3.6x1014 MIPS/cm2)

BC-600

EJ-500

Marine Epoxy

Mirror Coat

Acrylic

Polycarbonate

UV Resistive Acrylic

0

100

200

300

400

500

600

700

800

1.00E+12 1.00E+13 1.00E+14 1.00E+15 1.00E+16

Wav

elen

gth(

T=50

%)(n

m)

Fluence (MIPS/cm^2)

Irradiation Only

BC-600

EJ-500Mirror CoatSystem 3GP

E-05CLU-09FL