Recent Antiproton Source Operations

Keith Gollwitzer

Antiproton Source Department

Accelerator Division

Fermilab

5 May 2008

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

)

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

)

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

)

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

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

0 Stack size (mA) 80

0

Sta

ck r

ate

(mA

/hr)

2

4

3

2

Jan 1

May 4

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)