Storage Rings Group Meeting

Steve Werkema10 March 2010

2

Our piece of the action

3/10/2010

• P1-P2-AP1-AP3• Accumulator• Acc - Deb• Debuncher• Abort line(s)

3

Mu2e Cycle (Hybrid A)

3/10/2010

Accumulator Debuncher

Tim

e (1

5 Hz

tick

s)

0123456789

Momentum

Stacking

Beam intensity (Tp)0 4

Acc injectionevery 66.7 ms

0 4 8 12

Debuncher injectionevery ~150 ms4 single (2.5

MHz) bunch extractions

Bunch with 2.5 MHz RF system

4

Momentum Stackingin the Accumulator

3/10/2010

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

MHz

53 MHz

t = 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 time

DC

DC DC

2.5 MHz

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 1st injection

Four bunches at t= 0.167 sec

Bunching 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~220ns

FW= 100 MeVE(RMS)= 25MeV

~100% Duty factor

t=0.146 sec

t=0.167 sec

t=0.152 sec

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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 Debuncher• High intensities space charge, coherent

instabilities, radiation

3/10/2010

Single 2.5 MHz bunch extraction 400 nsec flattop

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Mu2e Organization

1 Mu2e project (Ron Ray)1.1 Mu2e Management1.2 Mu2e Accelerator (Mike Syphers)1.2.1 Project Management1.2.2 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 Preparation1.3 Conventional Construction (Tom Lackowski)1.4 – 1.9 Experiment components1.10 Project Management (Ron Ray)3/10/2010

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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 instabilities1.2.4.1.6 Lattice adjustments1.2.4.1.7 Accumulator / Recycler energy match1.2.4.1.8 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

3/10/2010

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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 RF1.2.4.3.2 Accumulator 2.5 MHz system1.2.4.3.3 Accumulator 53 MHz system1.2.4.3.4 Accumulator broadband system1.2.4.3.5 Accumulator RF extraction kicker

synch system1.2.4.3.6 Acc-Deb transfer phase jump system1.2.4.3.7 Debuncher 2.4 MHz system1.2.4.3.8 RF systems for beam studies/tuning

3/10/2010

10

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 measurement1.2.4.4.2 Debuncher tune measurement1.2.4.4.3 BPM upgrades1.2.4.4.4 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

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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. 2010

o Conceptual design of all systemso Resource loaded schedule that achieves the design

Work needs to begin now to establish a working design and make cost estimates.

3/10/2010

Good news: Now is your chance to leave your mark on this experiment – changes will be much more difficult after CD-1

Bad 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.)

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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

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Project Management Wisdom of the Day

3/10/2010

Future Meeting schedule ?