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RF & Linac Design Accelerator Design Program Update. Chris Adolphsen. Department Programs. International Linear Collider (ILC) All ILC areas except for ATF2 (APE and Test Facilities) FNAL Project X L-band CW (650 MHz) and Pulse rf (1.3 GHz) sources, … LARP Rotatable Collimator - PowerPoint PPT Presentation
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RF & Linac DesignAccelerator DesignProgram Update
Chris Adolphsen
Department Programs• International Linear Collider (ILC)
– All ILC areas except for ATF2 (APE and Test Facilities)• FNAL Project X
– L-band CW (650 MHz) and Pulse rf (1.3 GHz) sources, …• LARP
– Rotatable Collimator– UA9 Crystal Collimation– …
• SuperB– IR Design– Ring RF– ….
• X-band– CLIC Structure Tests– X-band Gun Development– X-band Linac Driven Light Sources (MEGa-ray, MaRIE, …)– ….
• Support for FACET, LCLS, Controls Upgrade, …
Klystron Cluster Scheme TestsResonantly power a 0.5 m diameter, pressurized (1 atm N2), 10 m long aluminum pipe to 300 MW TE01 mode field equivalent in 1 ms pulses
Time of Position 2 markers (T1,T2) are ~ 1 ms later than those from Position 1, which suggest events are much closer to Position 1 (5 m / 5100 m/s ~ 1 ms) T1 T2
Acoustic Sensor Breakdown Localization
CTO 21
0 10 20 30 40 50 60 70 800
200
400
600
Time: HrsP
ower
to C
TO (k
W)
0 10 20 30 40 50 60 70 8070
71
72
73
74
75
Time: Hrs
dBm
550 KW input power yields 300 MW equivalent surface fields in the pipe - see bkd every ~ 15 hours, maybe from CTO or upstream – rate seems very pressure dependent
‘Big Pipe’ Operation
Next: 160 m Resonate Ring
Status of ILC e- Source Laser System Development
• Two similar laser systems are being developed:1. SLAC design2. SBIR laser system (KM Labs)
• Both systems share similar challenges– CW amplifier pump lasers
• KM Labs system has been operational at 1.5 MHz at KM Labs facility inspected in October 2010
• Delivery in December 2010• KM Labs and SLAC systems are now in the process of installation
at SLAC’s ILC ITF• After KM lasers running at 1.5 MHz, will do a gun test and then
augment the PI pumps with the Coherent lasers to bring the KM system up to 3 MHz
KM Labs System Installation
Top Left: JohnS at KM Labs in Boulder, CO in OctoberTop Right: the laser being brought into B006 in December
Bottom: the laser on the table in Rm 107, B006 wherein we have tested the Photonics Industries (PI) green pump lasers. One of these work, one of these has low output.
Gun Development at JLab
Inverted InsulatorCathode
Anode
NEGs and Ground Screen
AnodeFeedthrough
JLab's Inverted gun design
Conditioned to 150kV without observed field emission
ILC DR Electron Cloud Working Group Tasks & Status
Reduced DR Circumference – ILC Low Power Scenario
Evaluation of reducing the DR circumference to one-half that specified for the RDRCorresponding reduction in bunch count to one-half of the RDR specification
Baseline Mitigation Recommendation
Evaluation of EC Mitigation R&D ResultsIdentify the most promising mitigation schemes
Identify candidates and issues for further R&D
Restored Bunch Count
Evaluation of options to restore the RDR bunch count for high luminosity operationIdentify safe path to restore bunch countEvaluate performance limits in low power configuration
March 2010October 2010
Under Evaluation
Participating Institutions:ANL, Cornell, INFN, KEK, LBNL, SLAC
Working Group coordinated by SLAC (M.Pivi).
Electron Cloud Mitigation Options
10
Clearing ElectrodesKEKB
Grooves w/TiN coating
Clearing ElectrodeCESRTA
Grooves on CuAfter extended operation
Stable Structures
Reliable Feedthroughs
Manufacturing Techniques& Quality
LanfaQuadrupole Region Evaluation for the 3.2km
DR for Possible High Current Operation
Need SEY~1 or better in quadrupoles with short bunch spacingsNeed to understand antechamber role CLOUDLAND simulations
(L.Wang, SLAC)
ECLOUD10 Workshop
MDI Work in Progress
Hall Design, Detector & Platform Vibration Analysis, “R20” Package w/ QD0 mover system, Frequency Scanning Interferometry Alignment
First Simulations of a Network of Launch Points and Retroreflectors for QD0K. Riles – U. Michigan
Vibration Measurement System to Support ILC MDI R&D: Testing on the SLD Detector
• Andrei Seryi’s old vibration measurement system has been resuscitated• Custom battery-operated preamps have been built• System noise level is very low: ~0.25 nm RMS (integrated power > 1 Hz)
SLAC Rotatable Collimator for LHC
Ratchet Gear Drive
RC-0 Jaw (copper)
RC-1 Jaw (Glidcop)
LHC IR7 Style BPM Buttons4 per end
Flex Support
Tank geometry allows a 60mm facet-to-facet gap in fully retracted Jaw position
Ferrite couldmount to BasePlate facing Jawfacet
BPM assemblies at each end are fiducialized to Collimator
Base Plate
Drive Mechanism
RF foils carry image current and shields Rot. Mech.
StatusIn Q1 FY11, mechanical work included the rebuild of the RF rotation mechanism on one of the jaws and the final reassembly/rebuild of the drives with W-S2 coated bearings.
The new design was tested to x5 anticipated torque required for rotation.
The four bellows were vacuum fired and welded on. Leak checking showed 9-scale vacuum.
Current Near Term R&D Plan• Ship first rotatable collimator prototype to CERN ASAP• Mechanical, vacuum & impedance tests by CERN personnel• Installation in SPS during technical stop of LHC
Location identified
• Beam tests of prototype in SPS in early 2011 Impedance
Operation
• Robustness tests in HiRadMat Facility ~ Summer 2011:
1 MJoule per accidental beam-abort Test extent of damage: molten & gaseous debris, hit face, adjacent face..
Permanent shock induced deformation of jaw
Operation of rotation drive & integrity of water circuits after impact(s)
SuperB Interaction Region
0
100
200
-100
-2000 1 2 3-1-2-3
mm
cm 3-Oct-09 M. Sullivan SB_I_ILC_R3_SR_3M
QF1QF1
HERLER
PM
Solenoids
QD0
300 mrad
Cryostat m
Developed a scheme for solenoid compensation that involves rotating the PMs as well as cancelling the detector field as much as possible
Recently, an orbit and skew correction scheme was developed to enable the machine to run with the detector field off using the same compensation hardware
Non-RF Bunch Linearizer for a All-X-Band Linac
Yipeng Sun
Simulations for 250 pC BunchesBC1:over-compress BC2:under-compress
Yipeng Sun
Use of Truncated Gaussian Laser Profile to Reduce LCLS Emittance
• Can improve LCLS projected and slice emittance 20%+• It is supported by theoretical analysis - space charge
forces are more linear in the Gaussian-cut case.• Scheduled to LCLS beam verification in late February.
x/r=0.5
x/r=1.0
x/r=10
F. Zhou, P. Emma, and Z. Huang
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