Recent Antiproton Source Operations
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Recent Antiproton Source Operations
Keith Gollwitzer
Antiproton Source Department
Accelerator Division
Fermilab
5 May 2008
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1/1/2008 2/1 3/1 4/1 5/1
10mm-3 2600V
Steel 1830V
10mm-2 2220V 2400V
Sta
ck R
ate
(mA
/hr)
Stack S
ize (mA
)
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1/1/2008 2/1 3/1 4/1 5/1
10mm-3 2600V
Steel 1830V
10mm-2 2220V 2400V
Record Accumulator Beam Current
313.58mAFebruary 21
Sta
ck R
ate
(mA
/hr)
Stack S
ize (mA
)
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1/1/2008 2/1 3/1 4/1 5/1
10mm-3 2600V
Steel 1830V
10mm-2 2220V 2400V
Progression of Stacked Antiprotons in 1 hour Record
Jan
8 2
4.69
mA
Jan
29
25.1
9mA
Mar
26
25.2
9mA
Ap
r 6
25.3
2mA
Ap
r 8
25.9
0mA
May
3 2
5.95
mA
May
5 2
6.09
mASta
ck R
ate
(mA
/hr)
Stack S
ize (mA
)
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10mm-5 Lens-transformer assembly is complete and ready for testing
10mm-3 Lens-transformer assembly has a new stripline and is the spare
Stripline failure early March
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Studies and Tuning • Debuncher Momentum Cooling Systems
– Gain Ramps – determined no affect for 2.2sec cycle– Double Notch Filter
• Not achieving desired notch depth• Thinking about new notch filter equalizer
– Individual band equalizers - designed first; await chance to install• Accumulator Stacktail System
– Delta Kicker to compensate for transverse heating by system• Some quick gains seen• “Centering” of 2 kicker tanks achieved the same effect; need to do all 10• May still get benefit with new equalizers
• Accumulator Transverse Cooling Systems– Individual band equalizers – first should be ready soon
• AP2/Debuncher Optics– More circulating beam by moving Debuncher tunes
• Decreases Debuncher cooling effectiveness – reverted to design tunes– More beam into Debuncher with some AP2 optics changes - ongoing
• Mechanics of transfers out of Accumulator– Rapid transfers covered last All Experimenters’ Meeting
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0 Stack size (mA) 80
0
Sta
ck r
ate
(mA
/hr)
2
4
3
2
Jan 1
May 4
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Summary• The Antiproton Source is running well
• Outlook is promising
• Recent Records– 313.58mA in Accumulator– 26.09mA in 1 hour– 3065.6mA in 1 week (Mon-Mon 00:00)