AGS fixed target program and plans

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AGS fixed target program and plans

• Present performance and program
• Planned AGS fixed target operation
• AGS intensity upgrades

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C-AD Accelerator Complex
1200 oclock
PHOBOS
200 oclock
1000 oclock
RHIC
400 oclock
800 oclock
600 oclock
AGS Intensity 7 ? 1013 protons/pulse Injector
to RHIC lt 2 hours about every 10 hours
Fast extraction
U-line
High Intensity Source
BAF (NASA)
m g-2
LINAC
HEP/NP
Pol. Proton Source
AGS
BOOSTER
With 2 GeV AGS inj. kicker ? 1 ? 1014
protons/pulse (?)
Slow extraction
TANDEMS
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AGS performance for g-2 operation

• 6 single bunch transfers from Booster
• Peak intensity reached 72 ? 1012 ppp
• Bunch area 3 eVs at injection
  10 eVs at extraction
• Intensity for g-2 ops 50-60 ? 1012 ppp
• Strong space charge effects during accumulation
  in AGS
• 2nd order transition energy jumplimits available
  momentum aperture.
• Chromatic mismatch at transitioncauses emittance
  dilution
• Dilution needed for beam stability

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7 Jul 01
AGS Experimental Area
E821, m g-2 E952, n mass (proposed to DOE)
FY2001 Physics Program- In Progress
Proton HEP, 12 weeks 25 GeV/c FEB
HEP/NP, 6 weeks 25 GeV/c SEB
DP/BES, 2 weeks 3-25 GeV/c FEB
HEP/BES, 4 weeks 25 GeV/c FEB, parasitic Fe
NASA 1 week 0.6-1 GeV/n Fe
U -E955, Proton Radiography (DP)
V1, p m Beam Line
V-Target
U Line
RHIC Transfer Line

D6 - E930, L Hypernuclei (Ge Ball)
A3 E957, NASA Radiobiology (Fe)
D-Target

A3- E951, mm Collider Targetry
A-Target

B-Target
C-Target
B5 - m channel E940, m N eN (proposed to NSF)
C-Target


B-Target
C4-LESBIII E949, K pnn



C7 - E956, Neutron Spallation (BES)
C10 - neutral beam E926, KL0 p0nn (proposed to
NSF)
C-Target
C5-Idle
C6-LESBII, Crystal Ball Idle E927, Ke3 Tests
E953, Baryon Spectroscopy E958, p- charge
exchange
C8-LESBII, NMS E931, DI1/2 Rule
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B C- Line Experimental Area, FY 2001
B2 Test Beam
MPS
B1 Test Beam
E871, KL0 me (complete 1996)
E956, SNS Test Facility (commissioned FY 2001)
E896, H Search (complete FY 1998)
E949, K pvv- (FY 2001-3)
E850, Color Transp (complete FY 1999)
E931, DI1/2 Rule (FY 2001-2)
E953,E958,E927, Crystal Ball (FY 2002)
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7 July 01
E952, n mass (proposed to DOE)
AGS Experimental Area
FY2002 Physics Program- Proposed
Proton HEP, 10 weeks 25 GeV/c SEB
NP, 4 weeks 25 GeV/c SEB NP,
10 weeks 25 GeV/c SEB (parasitic)
HEP/BES, 25 GeV/c FEB (to be determined) Fe
NASA 1 week 0.6-1 GeV/n Fe
U-idle
V1, p m Beam Line
V-Target
U Line
RHIC Transfer Line

D6 - E930, L Hypernuclei (Ge Ball)
P959, kaonic nuclei (proposal)
A3 E960, NASA radiobiology (Fe)
D-Target

A3- E951, mm Collider Targetry
A-Target

B-Target
C-Target
B5 - m channel E940, m N eN (proposed to NSF)
C-Target


B-Target
C4-LESBIII E949, K pnn



C7 - E956, neutron Spallation (BES)
C10 - neutral beam E926, KL0 p0nn (proposed to
NSF)
C-Target
C5-Idle
C6-LESBII, Crystal Ball E927, Ke3 tests E953,
baryon spectroscopy E958, p- charge exchange
C8-LESBII, NMS (removed after FY 2002 run) E931,
DI1/2 Rule
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RSVP Experiments, Plan View
7 GeV, 20 ns rms proton pulse every 1.4 ms
MECO m-N ? e-N
E949 K ? pnn
K0PI0 K0L ? p0nn
10 m
24 GeV, 200 ps rms proton pulse every 40 ns
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Micro-bunched slow extraction
Empty buckets generate energy modulation of
debunched beam Higher cavity voltage and/or
smaller Dp/p ? shorter bunches Need 150 - 250
ps bunches every 40 ns with about 95 extraction
efficiency
Energy
Time
Extraction resonance
Debunched beam
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E952 (n mass)
Convert to SEB parasitic to E949 or dedicated
J-Veto
g-2 calorimeters
C-Veto
Be dE/dx degrader plus silicon strip detector
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AGS intensity upgrades

• Needed upgrades
• 1.2 GeV superconducting linac extension for
  direct injection of 1 ? 1014 protons per pulse
  into AGS
• low beam loss at injection
• high repetition rate possible
• further upgrade to 1.5 GeV and 2 ? 1014 protons
  per pulse possible
• 2.5 Hz AGS repetition rate
• triple existing main magnet power supply and
  magnet current feeds
• double rf power and accelerating gradient
• further upgrade to 5 Hz possible

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AGS proton driver layout
To RHIC
High Intensity Source plus RFQ
To Target Station
116 MeV Drift Tube Linac (first sections of
existing 200 MeV Linac)
BOOSTER
AGS 1.2 GeV ? 24 GeV 0.4 s cycle time (2.5 Hz)
400 MeV
Superconducting Linacs
800 MeV
1.2 GeV
0.15 s
0.1 s
0.15 s
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AGS proton driver parameters

• present AGS 0.4 MW AGS 1 MW AGS
• Total beam power MW 0.14 0.4 1.00
• Beam energy GeV 24 24 24
• Average current mA 6 17 42
• Cycle time ms 2000 1000 400
• No. of protons per fill 0.7 ? 1014 1 ? 1014 1 ?
  1014
• Average circulating current A 4.2 5.9 5.9
• No. of bunches at extraction 6 6 6
• No. of protons per bunch 1 ? 1013 1.7 ? 1013
  1.7 ? 1013
• Total bunch area eVs 15 5 5
• Time betw. extr. bunches ms 33 20 20

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Summary

• Very successful operation for the g-2 experiment
• Operation with 7 ? 1013 slow extracted protons
  planned for RSVP
• Upgrade to 400 kW and 1 MW beam power feasible