Booster Fast Loss Monitoring PIP Booster Workshop R.J. Tesarek - - PowerPoint PPT Presentation

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Booster Fast Loss Monitoring PIP Booster Workshop R.J. Tesarek - - PowerPoint PPT Presentation

May 30, 2023 368 likes •640 views

Booster Fast Loss Monitoring PIP Booster Workshop R.J. Tesarek 11/23/15 1 Fast Loss Monitor Module Fast Loss Monitors: Module Schematic sensitive to losses in single RF bucket (time resolved) 2nd Generation Module Design: 2 PMTs and

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SLIDE 1

Booster Fast Loss Monitoring

PIP Booster Workshop

R.J. Tesarek 11/23/15

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

Fast Loss Monitors:

  • sensitive to losses in single RF bucket (time resolved)

2nd Generation Module Design:

  • 2 PMTs and bases
  • Hamamatsu H1949
  • typical gain 2.0e7
  • each PMT views 1 scintillator each ~12mm thick
  • active area: 50.8mm x 152.4mm
  • counters plateaued (Vthr = 30mV) to be efficient for MIPs

through 1 scint. plate

  • assembly surrounded by 5mm thick FR-4 (G-10)

Advantages:

  • can be sensitive to single minimum ionizing particle (MIP)
  • robust assembly (can be handled by gorilla)
  • less sensitive to activation products
  • very low noise rates (when PMTs in coincidence)

➡probe of loss dynamics is a by-product of fast detection

Disadvantages:

  • scintillator damaged by radiation (annual replacement?)

Fast Loss Monitor Module

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PMT 1 PMT 2 Module Schematic

charged particle

Construction/Calibration details in beams-docDB 4993

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

Module Installation (Collimators)

3 Vertical Target (5-3) Absorber 6A Absorber 6B Absorber 7 Horizontal Target (5-1)

5-4 5-3

installed 2/2015 installed 2/2015

Thanks to T.Johnson, D.Johnson, V.Kapin, K.Triplett, D. Dick

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

Booster Notching Region

4 Short 12 (12-2) Notcher Absorber Notcher Absorber detectors

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

1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 500 1000 1500 2000 2500 3000 3500 x 10 2 Time into cycle (µs) . E_beam (MeV)

Booster Cycle Overview (3/11/15)

5

Injection t = 0 E ~ 1,340 MeV T ~ 402 MeV P ~ 958 MeV/c Notch t ~ 400µs E ~ 1,343 MeV T ~ 404 MeV P ~ 961 MeV/c

PMT1 (downstream of 5-3) PMT3 (downstream of collimator 6B) Notch Cycle

Notch t ~ 5,200µs E ~ 1,703 MeV T ~ 765 MeV P ~ 1,422 MeV/c Extraction t ~ 33,300µs E ~ 8,882 MeV T ~ 7,943 MeV P ~ 8,832 MeV/c

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

Features in Booster Cycles (3/11/15)

6 Notch Cycle

5,266µs into cycle (Notch @ 5.2ms)

PMT1 downstream of 5-3 PMT3 Collimator 6B

Losses persist in collimator for ~250µs Losses persist in magnet for ~8-12µs (~4-6 revolutions)

NB: clipline added on 3/18/15

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

Features in Booster Cycles (3/12/15)

7 Notch Cycle

400µs into cycle (Notch @ 400µs)

Losses occur in same RF buckets on integer turns after the notcher fired 1 revolution 1 revolution

PMT1 downstream of 5-3 PMT3 Collimator 6B All losses after notch formation similar in character (not always in detail) NB: clipline added on 3/18/15

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

Scale of Fast Losses

8 1st bucket ~125 particles in the counter 1st bucket ~90 particles in the counter Signals calibrated to give ~2mV/MIP Dotted lines indicate approximate 1 bucket PMT signal (alone)

Notch

Note: Different NOTCH timing (absent?) for this event NB: clipline added on 3/18/15 NB: data from 3/2/15 PMT1 downstream of 5-3 PMT3 Collimator 6B

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

PMT Signals 3/31/15 “Loss Event”

9 PMT1 (downstream of 5-3) cycle Rev (RF/84 sync’d at notch)

Loss “event”

note scale PMT3 (collimator 6B)

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

Booster Cycle Fast Losses 11/13/15

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magnet 5-1 collimator 6A collimator 6B collimator 7

1 Booster Cycle

injection notch formation extraction transition crossing

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

Injection Fast Losses 11/13/15

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magnet 5-1 collimator 6A collimator 6B collimator 7

128 Booster Cycle Average

start of injection NOTE: Baselines shift indicates “DC” losses high losses with 1st protons ORBMP ramp down 2.2µs revolution

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

Module Readout and Gating

Need quantitative information for tuning and studies

  • MADC analog system too slow
  • Use AD 333 100MHz scalers and discriminate PMT signals

Instrumentation measures rates/booster cycle (independent of beam):

  • Rates average signals over period between $12 events (~1.33s), normalized per booster cycle
  • Use 333 scaler module for readout
  • Rates normalized by number of booster cycles
  • Clock: a periodic signal with a well known (stable) frequency. Because the booster RF is

modulated it can’t be a clock signal.

  • Booster RF: Booster RF signal (logic level) to provide background rejection from non-prompt
  • particles. Also counts “hits” for time-over-threshold discriminator.
  • Injection: Signal that beam may be injected into the booster (beam may not be present)
  • Gates: Time intervals of interest to measure rates in counter modules. To be fully defined, we

need a starting time (in the booster cycle) and a duration.

➡For instrumentation to be effective, we want to sample periods that are constant (VERY similar)

for every booster cycle.

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R(i) = s(i) − s(i − 1) INJ(i) − INJ(i − 1) · fCLK CLK(i) − CLK(i − 1)

clock: 38.768 kHz TTL temp compensated oscillator

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

Fast Loss Rates in ACNET

13 Gate tmin tmax Comment 1 Inj Inj + 300µs injection losses* 2 Inj + 300µs Inj + 800µs losses around 400µs structure* 3 Notch Notch + 500µs losses around notch formation 4 Notch + 500µs Notch + 2800µs losses around notch formation (separated for timing) 5 Notch + 2800 BES losses in rest of booster cycle#

Gates before summer shutdown (instruments at 5-3 and 6B) Gates after summer shutdown (instruments at 5-1, 5-3, 6A, 6B, 7) Need discussion:

  • Current booster cycle has losses from different activities in cycle overlapping.
  • Limited number of gates/333 modules

Candidates:

  • Injection
  • RF capture
  • Notching
  • Transition crossing
  • Extraction
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R.J. Tesarek 11/23/15 PIP Workshop

Fast Loss Rates in ACNET

14 Gate 1 I -> I+300µs Gate 3 N -> N+500µs Gate 2 I+300µs -> I+800µs A6B 5-3 A6B 5-3 A6B 5-3 Notch at 5,200µs Rate = 0 when no notch present

Data shown for time interval: 3/31 17:00 thru 4/1 13:00 Note: Correlation between some features observed at injection and features around notch formation for these data.

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

Fast Loss Rates in ACNET

15 Gate 3 N -> N+500µs Gate 4 N+500 -> N+2,800µs Gate 5 N+2,800µs -> BES A6B 5-3 A6B 5-3 A6B 5-3 Notch at 5,200µs Rate = 0 when no notch present

Data shown for time interval: 3/31 17:00 thru 4/1 13:00 Note: Correlation between some features observed at injection and features around notch formation and late in the cycle for these data.

band structure above correlated with 2 degree F variation in LLRF room temp

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

Plans & Summary

Plans (next few weeks)

  • Complete installation/commissioning of systems
  • notcher system (ready for ‘scope-permanent installation)
  • collimator system
  • determine gates for readout (collimator system)
  • cable readout for collimator system (expanded system over summer shutdown)

➡expect system fully operational early Dec.

Long term plans

  • autopsy counters exposed in booster for period 2/15 - 7/15 (radiation damage)
  • begin making detector replacements
  • explore rad-hard alternative to scintillator/PMT detectors (underway)

New very fast loss instruments installed

  • single RF bucket resolution on losses
  • interesting data from ‘scope traces
  • rate measurements tested - yield interesting results
  • commissioning underway for collimator system

Need catchy name for system

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

Acknowledgements

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The following folks contributed time/resources (tools) an information used in this talk

  • C.Bhat
  • S.Chaurize
  • R.Crouch
  • C.Drennen
  • D.Dick
  • V.Kapin
  • E.Hahn
  • D.Johnson
  • T.Johnson
  • C.Ornelas
  • W.Pellico
  • T.Sullivan
  • M.Syphers
  • K.Triplett
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Back Up Slides

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R.J. Tesarek 11/23/15 PIP Workshop 19

Target collimator Target Monitor

Two Stage Collimation

Absorber collimator Absorber Monitor My Understanding:

  • Target disrupts beam halo
  • Absorber absorbs disrupted beam
  • Target/Absorber monitors “observe” target and absorber collimators

➡Absorber should “shadow” target (absorber farther from beam core)

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

Module Placement

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Considerations:

  • Observe particles from single RF bucket
  • Low detection threshold (single MIP)
  • Wide variation in beam kinetic energy

(400 - 8000 MeV).

➡Place detectors < 20cm from loss source

0.001$ 0.010$ 0.100$ 1.000$ 10.000$ 1$ 10$ 100$ 1000$ 10ns%Flight%Distance%(m)% Momentum%(MeV/c)% e&$ mu&$ pi+$ K+$ p$

1 MIP Detection Threshold 20 cm

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

Module Calibration

Understand individual detector response

  • PMT signal
  • Efficiency vs HV (given Vthr)
  • Pulse height vs HV
  • Dark rate (noise) vs HV

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cosmic ray

discr. (Vthr = 30mv)

Test Setup Physical Setup

PMT 1 PMT 2 PMT 3 PMT 4 PMT 5 PMT 6

123456 123456 123456

Oscilloscope Visual Scalers PMT 1 PMT 3 PMT 5 PMT 2 PMT 4 PMT 6 PMT 3 PMT 4 cosmic ray

cosmic ray trigger

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

Typical Calibration (CDF030)

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Notes:

  • Only relative efficiency is

measured and includes a component due to geometric acceptance of cosmic rays and may differ from setup to setup.

  • Noise rates measured by

counting for 1 minute and dividing by 60.

  • Pulse height determined by

peak-to-peak measurements w/ an oscilloscope averaging

  • ver 512 4-fold

coincidences.

Ref: C.Ornelas, beams-doc-4993

0.2 0.4 0.6 0.8 1 1000 1200 1400 1600 1800 HV(volts) Effic plateau_cdf030.txt 2 4 6 8 10 12 14 16 18 20 1000 1200 1400 1600 1800 HV(V) Noise Rate (Hz) 20 40 60 80 100 120 140 160 180 200 1000 1200 1400 1600 1800 HV (V) PH (mV)

3.227 / 7 P1 1269. 4.877 P2 154.7 6.470
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R.J. Tesarek 11/23/15 PIP Workshop

Readout Logic (Details/Module)

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Discr

333 Scaler

Counter Module

50Ω (scope) C1 C2

C1:singles C2:singles

Discr Fan-Out

CLK CLK

Booster RF Clock Gate 1 Gate 2 Gate 3

Instrument Diagnostic Data Booster Collimator Data

Readout Logic (Details/Module)

Booster Injection

INJECT INJECT

Gate 4 Gate Test Gate 5 333 Scaler

Items in green are operational

50Ω (scope)

C1*C2*G3 C1*C2*G4 C1*C2*G1 C1*C2*G2 C1*C2*G5 C1*C2*GTEST

Fan-Out

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

Clip Line Pulse Narrowing

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Cable Length = 235ns Clipline R = 50Ω #samples = 512 Cable Length = 235ns Clipline R = 10Ω #samples = 512

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

Injection Fast Losses 11/13/15

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magnet 5-1 collimator 6A collimator 6B collimator 7

1 Booster Cycle

notch formation NOTE: Baselines shift indicates “DC” losses 1st revolution after notch formation 2.2µs (revolution)

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

Notch Formation Fast Losses 11/13/15

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magnet 5-1 collimator 6A collimator 6B collimator 7

1 Booster Cycle

notch formation NOTE: Baselines shift indicates “DC” losses RF paraphase (capture) Turn on control feedback Injection