Rad Hard Detectors for Accelerator Instrumentation · • Rad Hard (Φ > 1015 Particles/cm2; 50...
Transcript of Rad Hard Detectors for Accelerator Instrumentation · • Rad Hard (Φ > 1015 Particles/cm2; 50...
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
4
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