Slow Extraction Operations at Fermilab Main Injector
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Denton Morris
Slow Extraction Workshop
22 July 2019
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D. Morris |Slow Extraction From The Fermilab Main Injector
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The Fermilab Main Injector :
120GeV/c
53MHz RF bunch structure
588 RF bucket circumference
486 bunches @ 2e10 ppb
4 second slow spill
½ Integer
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Mixed test beams available at Fermilab
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Low to medium energies, two production targets
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Two test beam lines; 2%
p/p
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(MT4 target)
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High energy positrons (60 GeV) have been observed
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SpinQuest/E1039:
120 GeV protons
1e13 protons per 4 sec. spill
Cryogenic polarized
proton target
Spectrometer
Hodoscope array
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At 120 GeV:
Increase the horizontal tune to 26.485
Ramp up 53
rd
harmonic quad circuits
Two orthogonal circuits with eight magnets each
Ramp octopole circuits
Enable 0
th
order quad circuits (QXR) to
regulate spill
QXR:
Two air core quadrupole magnets
Three tap fir-filter learning algorithm
~300 Hz response
50 Amp drive
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Extraction Septa:
Two 3m tanks
Wire plane is 0.1 mm Tungsten-Rhenium wire
1440 wires per tank spaced 2.5 mm apart
Cathode runs -100 Kvolts
Wire plane to cathode = 14 mm
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4 seconds of spill looks good at 4e12, not so good at 4e4 ppb
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Main bus power: 13.8 KV through
Y transformer
= a lot of 60 Hz harmonics
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Spill duty factor (53 MHz) is 45%
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Proton extraction efficiency is ~95%
Overview of slow extraction operations at Fermilab Main Injector, covering beam transport, low to medium energy user test beams, Drell-Yan experimental beam, and spill procedures. Details on beam targets, production, and observation of high-energy positrons. Also, insights on spill regulation techniques such as increasing horizontal tune, ramping up quad circuits, and utilizing extraction septa.
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Presentation Transcript
Slow Extraction Operations: Fermilab Main Injector Denton Morris Slow Extraction Workshop 22 July 2019
Fermilab Overview: Beam Transport 2 D. Morris |Slow Extraction From The Fermilab Main Injector 8/14/2024
Fermilab Overview: Beam Transport The Fermilab Main Injector : 120GeV/c 53MHz RF bunch structure 588 RF bucket circumference 486 bunches @ 2e10 ppb 4 second slow spill Integer 3 D. Morris |Slow Extraction From The Fermilab Main Injector 8/14/2024
Low and Medium Energy User Test Beams at Fermilab Mixed test beams available at Fermilab Low to medium energies, two production targets Two test beam lines; 2% p/p 120 GeV primary protons from MI (up to 1013p/spill) 32-60 GeV pions and some protons (MT1 target) 1-30 GeV pions, electrons, kaons, or broadband muons (MT4 target) High energy positrons (60 GeV) have been observed 0.2-2 GeV pions, protons, kaons (tertiary target, MCenter line, MC5) 4 D. Morris |Slow Extraction From The Fermilab Main Injector 8/14/2024
Drell-Yan Experimental Beam at Fermilab SpinQuest/E1039: 120 GeV protons 1e13 protons per 4 sec. spill Cryogenic polarized proton target Spectrometer Hodoscope array 5 D. Morris |Slow Extraction From The Fermilab Main Injector 8/14/2024
How We Spill At Fermilab 6 D. Morris |Slow Extraction From The Fermilab Main Injector 8/14/2024
How We Spill At Fermilab At 120 GeV: Increase the horizontal tune to 26.485 Ramp up 53rd harmonic quad circuits Two orthogonal circuits with eight magnets each Ramp octopole circuits Enable 0th order quad circuits (QXR) to regulate spill QXR: Two air core quadrupole magnets Three tap fir-filter learning algorithm ~300 Hz response 50 Amp drive 7 D. Morris |Slow Extraction From The Fermilab Main Injector 8/14/2024
How We Spill At Fermilab: Extraction Region Extraction Septa: Two 3m tanks Wire plane is 0.1 mm Tungsten-Rhenium wire 1440 wires per tank spaced 2.5 mm apart Cathode runs -100 Kvolts Wire plane to cathode = 14 mm 8 D. Morris |Slow Extraction From The Fermilab Main Injector 8/14/2024
Main Injector Septa 9 D. Morris |Slow Extraction From The Fermilab Main Injector 8/14/2024
How We Spill At Fermilab: Extraction Region 10 D. Morris |Slow Extraction From The Fermilab Main Injector 8/14/2024
Extracted Beam Properties 4 seconds of spill looks good at 4e12, not so good at 4e4 ppb 11 D. Morris |Slow Extraction From The Fermilab Main Injector 8/14/2024
Extracted Beam Properties Main bus power: 13.8 KV through Y transformer = a lot of 60 Hz harmonics Spill duty factor (53 MHz) is 45% Proton extraction efficiency is ~95% 12 D. Morris |Slow Extraction From The Fermilab Main Injector 8/14/2024
