Eric Prebys FNAL Accelerator Physics Center June 7-17, 2010.
MiniBooNE Meeting 4/22/05 Eric Prebys 1 Status of the Proton Source Haud ignota loquor* Eric Prebys...
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MiniBooNE Meeting 4/22/05 Eric Prebys 1 Status of the Proton Source Status of the Proton Source Haud ignota loquor* Haud ignota loquor* Eric Prebys *I say things that are known
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Transcript of MiniBooNE Meeting 4/22/05 Eric Prebys 1 Status of the Proton Source Haud ignota loquor* Eric Prebys...
MiniBooNE Meeting 4/22/05 Eric Prebys 1
Status of the Proton SourceStatus of the Proton Source
Haud ignota loquor*Haud ignota loquor*
Eric Prebys
*I say things that are known
MiniBooNE Meeting 4/22/05 Eric Prebys 2
Fortitudine VincimusFortitudine Vincimus11
• Booster performance has been steady and consistent with the Proton Plan since the shutdown.
• We were anticipating significant beam lost to NuMI by this time, but Diis aliter visum2 , and Malum quidem nullum esse sine aliquo bono3
• As of April 3, habemus VeXX4
• Ergo bibamus5
1By endurance we conquer2The gods decided otherwise3There is, to be sure, no evil without some good4We have 5e205Therefore, let us drink.
MiniBooNE Meeting 4/22/05 Eric Prebys 3
Initial NuMI ProgressInitial NuMI Progress
NuMI PoT per Hour (E14)
0
50
100
150
200
250
300
350
400
450
500
3/14
/200
5
3/28
/200
5
4/11
/200
5
4/25
/200
5
5/9/
2005
5/23
/200
5
6/6/
2005
6/20
/200
5
7/4/
2005
7/18
/200
5
8/1/
2005
8/15
/200
5
8/29
/200
5
9/12
/200
5
9/26
/200
5
Design
Base
Actual
Target Failure
PoT per Week (E16)
0
50
100
150
200
250
300
350
400
450
500
3/14
/200
5
3/28
/200
5
4/11
/200
5
4/25
/200
5
5/9/
2005
5/23
/200
5
6/6/
2005
6/20
/200
5
7/4/
2005
7/18
/200
5
8/1/
2005
8/15
/200
5
8/29
/200
5
9/12
/200
5
9/26
/200
5
Desig
Base
Actual
MiniBooNE Meeting 4/22/05 Eric Prebys 4
NuMI Target StatusNuMI Target Status
• After two weeks of running, water was found in the oil of the vacuum pump which pumps out the target pipe.
• A scan confirmed that the volume was full of water.
• The target was removed and the water pumped out, but they have been unable to reproduce the leak.
• They have returned the target with a “water letter outer” added.
• Will attempt to run with a Helium overpressure in the target volume.
• Probably begin to take beam early next week.
MiniBooNE Meeting 4/22/05 Eric Prebys 5
Hourly Proton RateHourly Proton Rate
Total Peak Hourly Rate (BNB+NuMI+pbar)
0
2
4
6
8
10
12
12/1/2004 1/30/2005 4/1/2005 6/1/2005 8/1/2005 10/1/2005 12/1/2005
Date
p/h
r (E
16
)
Design
Fallback
Actual
Average Hourly Rate (BNB+NuMI+pbar, while up)
0
2
4
6
8
10
12
12/1/2004 1/30/2005 4/1/2005 6/1/2005 8/1/2005 10/1/2005 12/1/2005
Date
p/h
r (E
16
)
Design
Fallback
Actual
Improved cogging stability
MiniBooNE Meeting 4/22/05 Eric Prebys 6
EfficienciesEfficiencies
Uptime
0
10
20
30
40
50
60
70
80
90
100
12/1/2004 1/30/2005 4/1/2005 6/1/2005 8/1/2005 10/1/2005 12/1/2005
Date
%
Design
Actual
Average to Peak Efficiency (during uptime)
0
10
20
30
40
50
60
70
80
90
100
12/1/2004 1/30/2005 4/1/2005 6/1/2005 8/1/2005 10/1/2005 12/1/2005
Date
%
Design
Actual
MiniBooNE Meeting 4/22/05 Eric Prebys 7
Overall “Peak to Week” EfficiencyOverall “Peak to Week” EfficiencyOverall "Peak to Week" Efficiency
0
10
20
30
40
50
60
70
80
90
12/1/2004 1/30/2005 4/1/2005 6/1/2005 8/1/2005 10/1/2005 12/1/2005
Date
% Design
Actual
Includes 5% additional downtime for Ecool access
MiniBooNE Meeting 4/22/05 Eric Prebys 8
Integrated Delivery (BNB)Integrated Delivery (BNB)
Weekly Proton Totals (BNB+NuMI)
0
2
4
6
8
10
12
12/1/2004 1/30/2005 4/1/2005 6/1/2005 8/1/2005 10/1/2005 12/1/2005
Date
To
tal P
roto
ns
(E
18)
Design
Fallback
Actual
Cumulative Proton Totals (BNB+NuMI)
0
50
100
150
200
250
300
350
400
12/1/2004 1/30/2005 4/1/2005 6/1/2005 8/1/2005 10/1/2005 12/1/2005
Date
To
tal P
roto
ns
(E18
)
Design
Fallback
Actual
MiniBooNE hits 5E20 protons!
MiniBooNE Meeting 4/22/05 Eric Prebys 9
IssuesIssues
• In terms of beam loss, we are doing very well Loss limit frequenty > 1E17 pph!
• However, we have not been able to hit high batch intensities Typically 4-4.5E12 MB intensity limited by 5Hz rate
• This will become a bigger issue when NuMI comes back online
• Now that cogging is working, reaching high batch intensities is a priority. Almost certainly related to our present slip stacking
problems.
MiniBooNE Meeting 4/22/05 Eric Prebys 10
Major Ongoing ProjectsMajor Ongoing Projects
• ORBUMP system Major redesign of injection scheme
• 3 magnets versus 4• Eliminates problematic injection element (DCSEP)
Magnet and power supply will be ready for the 2005 shutdown (likely to start Nov 1)
• Dump reloction Booster dump will be relocated from Long 13 to the
MI-8 line. This will eliminate one of the two extraction regions
and should reduce loss significantly.
