Transcript LBNL Damping Ring R&D Plans

DR Kicker R&D:
Goals and Work Scope
Michael S. Zisman
and
Tom Mattison
September 28, 2006-Cornell (Zisman/Mattison)
Global Design Effort
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Caveats
• This is the first pass, not the final story
• Proposed activities not (yet) based on funding
realities
• The global DR R&D effort will be defined and
assessed by the S3 task force
• All WPs except last 2 have “very high priority”
September 28, 2006-Cornell (Zisman/Mattison)
Global Design Effort
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R&D Goals
• Specify component performance parameters
– rise time, fall time, tolerances
• can any be relaxed to make the system more robust or cheaper?
– acceptable impedance, vacuum properties, ECI issues
• Demonstrate one or more technologies that meet specs
– bench tests of pulser
• short-term, long term, abuse-tolerance
• verify burst mode operation
– bench tests of kicker structure
– bench tests of pulser+structure+load system
– beam tests of pulser+kicker+load+controls system
• measure system pulse shape (can be single-pulse, should be highresolution)
• verify beam interaction properties (ideally in realistic ring)
– emittance preservation
September 28, 2006-Cornell (Zisman/Mattison)
Global Design Effort
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Institutions Involved
• U.S.
– Cornell, FNAL, LBNL, LLNL, SLAC, UIUC
• Japan
– KEK
• Europe
– INFN-LNF
• It would be good to involve other groups in this “very
high priority” effort
September 28, 2006-Cornell (Zisman/Mattison)
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Work Packages (1)
• Inductive Adder FET Pulser
– Cook, Burkhart, Cassel, Krasnykh, Larson, Ross, Naito
• Plans:
– FY07: Modulator prototype development
– FY08: Modulator prototype testing; HA element design
– FY09: High Availability testing
• Comments
– beam testing planned in context of ATF2 program
– need to improve intrinsic rise time before High
Availability becomes the main issue
September 28, 2006-Cornell (Zisman/Mattison)
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Work Packages (2)
• Drift Step Recovery Diode Pulsers
– Krasnykh, Burkhart, Gollin, Meller, Urakawa, De Santis, ??
• Plans:
– FY07
• continued testing of commercial (FID GmbH) limited voltage and reprate devices (bench, beam)
• pulser development (SLAC + SBIR)
– FY08
• DSRD as pulse-sharpener for other pulsers
• Comments
– existing “FID” tests seem to have been DSRD pulsers!
– concerns about robustness
– single-source issues
• SLAC+SBIR effort helps address that
September 28, 2006-Cornell (Zisman/Mattison)
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Work Packages (3)
• Collaborate with FID GmbH
– ??
• Plans
– FY07
• determine switching technology used in what we have tested
• test pulsers with real FID used as final switching element
• understand proposal for high-voltage, high rep-rate pulser
– switching technology
– other technical issues being addressed
– level of information sharing
• decide how to proceed
– FY08
• proceed
September 28, 2006-Cornell (Zisman/Mattison)
Global Design Effort
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Work Packages (4)
• Stripline structures
• Plans
– FY07
• EM simulations (field uniformity, matching, tapers, fins, etc)
– De Santis, Krasnykh, LNF, ??
• feedthrough development (matching, voltage, manufacturing)
– Krasnykh, LNF, ??
• structure fabrication
– LNF for DAΦNE (already done for ATF2)
• structure bench tests
– could be done with beam test structure
– FY08
• structure tests with beam
– DAΦNE, ATF2
September 28, 2006-Cornell (Zisman/Mattison)
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Work Packages (4) cont’d
• Comments
– systematic studies of kicker structure and feedthrough design need to be expedited
– need to look for trapped modes in structure
• with computer codes
• with wire measurements (LBNL?)
• develop damping methods for structure if needed
September 28, 2006-Cornell (Zisman/Mattison)
Global Design Effort
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Work Packages (5)
• Beam Tests at Fermilab A0
– Gollin, Meller, Edwards, ??
• Plans:
– FY07
• continue tests with FID pulser: time & amplitude stability, reliability
• systematics of time measurements
• kicker measurement sensitivity to AØ beam stability
– FY08
• investigate possibility of tests with other pulser technologies
• investigate AØ reconfiguration: redundant measurements; two phase
detectors; better BPMs; lower fringe field magnets
– FY09
• reconfigure AØ for measurements of realistic system
September 28, 2006-Cornell (Zisman/Mattison)
Global Design Effort
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Work Packages (6)
• Beam tests at ATF
– Urakawa, DeSantis, Meller
• Plans:
– FY07
• improve instrumentation for kicker tests
– bpms; laser wire emittance measurements; DAQ
• retest system with multiple bunches
– plan to complete test program during 2007
• may preclude tests of other candidate systems
• Comments
– most realistic test under “combat” conditions
September 28, 2006-Cornell (Zisman/Mattison)
Global Design Effort
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Work Packages (7)
• Beam tests at DAΦNE
– Alesini, Guiducci, Marcellini, Raimondi, DeSantis
• Plans:
– FY07
• Feedthru development, stripline fabrication, bench tests
– FY08
• Install and operate in DAΦNE production running
– FY09
• test with alternative pulser systems ?
September 28, 2006-Cornell (Zisman/Mattison)
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Work Packages (8)
• Examination of other pulser technologies
– Mattison, ??
• Plans:
– FY07
• bench-test ferrite shockline with (FET?) pulser
• explore other technologies to see if any have promise
in terms of performance, cost, reliability, tech transfer
– FY08
• develop and bench test other systems if promising candidate
identified
– FY09
• test with beam?
• Comments
– ferrite shock lines, avalanche transistors, hard tube pulsers
are candidate technologies identified to date
September 28, 2006-Cornell (Zisman/Mattison)
Global Design Effort
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Work Packages (9)
• Outside the box
– Gollin, Meller, Willeke, Wolski, Rubin, ??
• Possibilities
–
–
–
–
Fourier transform scheme
RF separator for kicker-septum region
off-axis injection with slow kickers for electrons
big slow bump and small fast kick for electron
extraction
September 28, 2006-Cornell (Zisman/Mattison)
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Summary
• We have begun task of planning and prioritizing
DR R&D kicker program for the TDR phase
• Still lots to do
– develop priority list reconciled with RDB priorities
– develop effort and M&S requirements
• much of this exists already at least partially
– develop critical milestone list
• based on assumption that required resources will be provided
• indicate what key questions will be answered each year and
why they are important
• Costs matter: should we focus on least expensive
technology?
September 28, 2006-Cornell (Zisman/Mattison)
Global Design Effort
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