Download - Tevatron Collider Run II - Doing Shots
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11 January 2001 CDF – Intro to Shots 2
fWhat’s a Shot?
• Transferring Antiprotons from the Accumulator to the Tevatron.
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11 January 2001 CDF – Intro to Shots 3
fWhat’s Shot set up ?
• All of the preparatory steps needed to do shots.
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11 January 2001 CDF – Intro to Shots 4
fAccelerator Complex Overview
Tevatron
Proton source
Main InjectorRecycler
Antiproton source
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11 January 2001 CDF – Intro to Shots 5
fAccelerator Complex Overview
Tevatron
Proton source
Main InjectorRecycler
Antiproton sourceAP3
P2
P1
AP1
A1
MI-8
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11 January 2001 CDF – Intro to Shots 6
fAccelerator Complex Overview
– Proton source• Cockroft-Walton preaccelerator 750 keV
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11 January 2001 CDF – Intro to Shots 7
fAccelerator Complex Overview
– Proton source• Drift tube Linac
116 MeV
– Proton source• Side-coupled
cavity Linac 400 MeV
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11 January 2001 CDF – Intro to Shots 8
fAccelerator Complex Overview
– Proton source• Rapid-cycling Booster synchrotron 8 GeV
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11 January 2001 CDF – Intro to Shots 9
fAccelerator Complex Overview
• Main Injector/Recycler 8 to 150 GeV
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11 January 2001 CDF – Intro to Shots 10
fAccelerator Complex Overview
• Antiproton source– Antiproton production target station 120 GeV– Debuncher 8 GeV– Accumulator 8 GeV
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11 January 2001 CDF – Intro to Shots 11
fAccelerator Complex Overview
• Tevatron– Superconducting synchrotron 980
GeV
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11 January 2001 CDF – Intro to Shots 12
fShot set-up – prerequisites
• Previous Store ended• Tevatron at 150 GeV• Desired number of antiprotons
accumulated
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11 January 2001 CDF – Intro to Shots 13
fShot set-up – a 3-ring circus
Tevatron Main Injector Pbar sourceSet at 150 GeV Check/correct closed orbit Cool Pbars into core &
maintain stability
Verify/correct A150 line tune
Check/correct extraction positions
Accept reverse protons, maximize transmission
from MI, minimize injection oscillations
Load protons Provide protons for tuneup of beam lines
Redistribute core longitudinally for
unstacking
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11 January 2001 CDF – Intro to Shots 14
fShot set-up - Tevatron
• Back to 150 GeV• Reverse injection to MI
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11 January 2001 CDF – Intro to Shots 15
fShot set-up – Main Injector
• Orbit/tunes set• Reverse protons to Pbar• Protons to Tevatron
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11 January 2001 CDF – Intro to Shots 16
fShot set-up – Antiproton source
• ‘cool’ the core• maintain stability
– tranverse emittances– longitudinally
• tools– Stochastic cooling– Stabilizing RF– dampers
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11 January 2001 CDF – Intro to Shots 17
fShot set-up – Antiproton source
• Reverse Proton tune up
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11 January 2001 CDF – Intro to Shots 18
fShot set-up – Antiproton source
• Minimize Accumulator Turn-by-Turn oscillations
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11 January 2001 CDF – Intro to Shots 19
fShot set-up – ‘dry’ shots
• Test shots without beam– RF systems play except for unstacking amplitude– Verify phase lock– Verify timing– Verify kicker magnets are working
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11 January 2001 CDF – Intro to Shots 20
fShot set-up – Antiproton source
• Squaring the core– Frequency-modulated 1.25 MHz RF– Unstack uniform intensity bunches
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11 January 2001 CDF – Intro to Shots 21
fDoing Shots
• Load protons• Unstack from core• Pbars to MI• Accelerate to 150 GeV & Coalesce• Transfer to Tevatron/cog
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11 January 2001 CDF – Intro to Shots 22
fDoing Shots
• Unstacking– ‘square’ core allows uniform intensity of pbar
bunches
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11 January 2001 CDF – Intro to Shots 23
fDoing Shots
• Unstacking– 2.5 MHz (h=4) RF system– 4 bunches at a time– low initial voltage – increase voltage to
narrow bunches– lock to MI RF– bunch at 53 MHz (h=84)– extract– ~30 seconds per transfer
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11 January 2001 CDF – Intro to Shots 24
fDoing Shots
• Unstacking & Extraction– Re-bunch at 53 MHz on extraction orbit– Shuttered fast kicker magnet (1.6s)
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11 January 2001 CDF – Intro to Shots 25
fDoing Shots
• Transfer to MI• Acceleration to 150 GeV• coalescing• another talk
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11 January 2001 CDF – Intro to Shots 26
fDoing Shots
• Coalescing– 4-53 MHz bunch trains into 4-2.5 MHz bunches
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11 January 2001 CDF – Intro to Shots 27
fDoing Shots
• Transfer to the Tevatron– another talk
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11 January 2001 CDF – Intro to Shots 28
fTevatron Loading scheme
• Antiprotons are loaded four bunches at a time for a total of 9 transfers from the Accumulator to MI to the Tevatron
• The 36 bunches of Pbars are equally spaced in 3 groups of 12 around the Tevatron
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11 January 2001 CDF – Intro to Shots 29
fImportant Tools
• Sequencer• Time Line Generator (TLG)• Dedicated Applications• CDA/SDA
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11 January 2001 CDF – Intro to Shots 30
fImportant Tools
• Sequencer– ACNET application– Automates much of the process– Flexible– Interactive
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11 January 2001 CDF – Intro to Shots 31
fImportant Tools
• Time Line Generator (TLG)– central Beam switching system– who gets what beam when and how often– different Timelines for different modes
• Shot set up• Load protons• Load pbars
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11 January 2001 CDF – Intro to Shots 32
fImportant Tools
• Dedicated Applications– Beam line tuning– Orbit display and control– RF and stochastic cooling systems– Diagnostic display– Parameter pages
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11 January 2001 CDF – Intro to Shots 33
fImportant Tools
• CDA/SDA– Gather, display, and analyze data from shots– State-based– Java applications
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11 January 2001 CDF – Intro to Shots 34
fArmchair Shooter
• How to watch?– Channel 13/Notify– Pbar TV channel 7 – AP1 wall current monitor– Pbar TV channel 15 – Accumulator Vector Signal Analyzer– Pbar TV channel 16 – Accumulator unstacking display– Pbar TV channel 18 – Accumulator Vector Signal Analyzer– Pbar TV channel 28 – Accumulator Stack (longitudinal)
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