Steve Werkema 10 March 2010 Our piece of the action 3102010 2 P1P2AP1AP3 Accumulator Acc Deb Debuncher Abort lines Mu2e Cycle Hybrid A 3102010 3 Accumulator Debuncher ID: 257086
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Slide1
Storage Rings Group Meeting
Steve Werkema
10 March 2010Slide2
Our piece of the action
3/10/2010
2
P1-P2-AP1-AP3
Accumulator
Acc - Deb
Debuncher
Abort line(s)Slide3
Mu2e Cycle (Hybrid A)
3/10/2010
3
Accumulator
Debuncher
Time (15 Hz ticks)
0
1
2
3
4
56789MomentumStacking
Beam intensity (Tp)
0 4
Acc injectionevery 66.7 ms
0 4 8 12
Debuncher injection
every ~150 ms
4 single (2.5 MHz) bunch extractions
Bunch with 2.5 MHz RF systemSlide4
Momentum Stackingin the Accumulator
3/10/2010
4
Injection
Central Orbit
53 MHz
t = 0 sec One Booster batch
injected. Decelerated with
52.8 MHz RF and
debunched near cent orb.
t = 67 msec 2nd batch injected and decelerated, debunched.
53 MHz53 MHzt = 133 msec 3rd batch injected and decelerated, debunched.
t = 133+ msec Bunched with 2.5 MHz (h=4) RF and extracted one bunch at a
timeDC
DCDC
2.5 MHzSlide5
Chandra Bhat
5
ESME Simulations – Scenario-I
Partial bunching
with Barrier rf T= 0.152sec
Capture with 2,5MHz rf,
t= 0.167sec Vrf (2.5MHz) = 40kV
Saw-tooth rf using Barrier RF
t=0.146s after the 1
st
injectionFour bunches at t= 0.167 secBunching using Barrier saw-tooth rf and 2.5 MHz rf. Beam is ready for the Mu2e experiment in
33 ms after the 3rd injection(RMS)~53ns, FW~220nsFW= 100 MeVE(RMS)= 25MeV~100% Duty factort=0.146 sec
t=0.167 sec
t=0.152 secSlide6
Implications
We need three 15 Hz kickers:
Accumulator injection
Accumulator extraction
Debuncher injection
Momentum stacking requires Accumulator extraction at zero dispersion {i.e. D-A (now A-D) line moves}
New RF systems in Accumulator and DebuncherHigh intensities space charge, coherent instabilities, radiation
3/10/2010
6
Single 2.5 MHz bunch extraction 400 nsec flattopSlide7
Mu2e Organization
1 Mu2e project (
Ron Ray
)
1.1 Mu2e Management
1.2 Mu2e Accelerator (
Mike Syphers
) 1.2.1 Project Management
1.2.2 Proton Source (Bill Pelico)
1.2.3 Recycler (Ioanis Kourbanis)
1.2.4 Storage Rings (Steve Werkema) 1.2.5 Radiation Safety Improvements (Tony Leveling) 1.2.6 Resonant Extraction System (Leo Michelotti) 1.2.7 External Beamline (Carol Johnstone) 1.2.8 Extinction (Eric
Prebys) 1.2.9 Target Station (Rick Coleman) 1.2.10 Operations Preparation 1.3 Conventional Construction (Tom Lackowski) 1.4 – 1.9 Experiment components 1.10 Project Management (Ron Ray)3/10/20107Slide8
1.2.4 Storage Rings Organization (1)
1.2.4 Storage Rings (
Steve Werkema
)
1.2.4.1 Storage Rings R&D (
Werkema/Nagaslaev)
1.2.4.1.1 Momentum Stacking R&D (Peterson/Bhat)
1.2.4.1.2 Bunch formation R&D (Peterson/Bhat) 1.2.4.1.3 Injection / extraction kicker R&D (
Dave VanderMeulen) 1.2.4.1.4 Space charge studies (Steve Werkema
) 1.2.4.1.5 Coherent instabilities 1.2.4.1.6 Lattice adjustments 1.2.4.1.7 Accumulator / Recycler energy match 1.2.4.1.8 Beam studies 1.2.4.2 Beam lines (Jim Morgan) 1.2.4.2.1 Recycler to Accumulator beamline modifications 1.2.4.2.2 Ring-to-Ring transfer line 1.2.4.2.3 Injection and Extraction
3/10/20108Slide9
1.2.4 Storage Rings Organization (2)
1.2.4 Storage Rings (
Steve Werkema
)
1.2.4.1 Storage Rings R&D (
Werkema/Nagaslaev)
1.2.4.2 Beam lines (Jim Morgan) 1.2.4.3 RF Systems (
Dave Peterson) 1.2.4.3.1 Low Level RF
1.2.4.3.2 Accumulator 2.5 MHz system 1.2.4.3.3 Accumulator 53 MHz system 1.2.4.3.4 Accumulator broadband system
1.2.4.3.5 Accumulator RF extraction kicker synch system 1.2.4.3.6 Acc-Deb transfer phase jump system 1.2.4.3.7 Debuncher 2.4 MHz system 1.2.4.3.8 RF systems for beam studies/tuning3/10/20109Slide10
1.2.4 Storage Rings Organization (3)
1.2.4 Storage Rings (
Steve Werkema
)
1.2.4.1 Storage Rings R&D (
Werkema/Nagaslaev)
1.2.4.2 Beam lines (Jim Morgan) 1.2.4.3 RF Systems (
Dave Peterson) 1.2.4.4 Instrumentation (Dave Peterson)
1.2.4.4.1 DC beam measurement 1.2.4.4.2 Debuncher tune measurement
1.2.4.4.3 BPM upgrades 1.2.4.4.4 Spill monitoring 1.2.4.5 Cooling removal (Brian Drendel) 1.2.4.6 Beam Damper systems (Dave Peterson) 1.2.4.7 Beam abort system (Jim Morgan) 1.2.4.8 Infrastructure improvements (Brian Drendel)3/10/2010
10Slide11
Work to be Done
Immediate goal is to get CD-1 (
1 Mar. 2011
)
CD-1 requires a CDR (Conceptual Design Report)
CDR contributions submitted by
1 Dec. 2010Conceptual design of all systems
Resource loaded schedule that achieves the design Work needs to begin now
to establish a working design and make cost estimates.
3/10/201011
Good news: Now is your chance to leave your mark on this experiment – changes will be much more difficult after CD-1Bad news: We’ll have to live with all of the bad decisions made during the next year.Already in progress:NOnA kicker design (Chris Jensen)RF simulations (Chandra Bhat)Extraction R&D (Leo Michelotti et.al.)Slide12
Beam Studies
Measure Debuncher betatron resonance strengths and stop band widths
2.5 MHz bunch capture in Accumulator
Extinction via momentum collimation test with 2.5 MHz bunches in the Accumulator (How do we measure this?)
Determine why reverse protons blow up longitudinally on the Accumulator injection orbit.
3/10/2010
12Slide13
Project Management Wisdom of the Day
3/10/2010
13
Future Meeting schedule ?