Discussion on the magnetic shielding: The magnetic shielding will not be installed until the 2016 shutdown.The magnetic shielding test fixture will be used to develop and verify the design of the shielding. A measurement probe system needs to be designed that can transit down the test fixture.After installation, a measurement must be made in the tunnel to confirm that the installed shielding reduces the magnetic field in the beam tube to < 1 mG.Discussion on 180 dipoleNeed information on NMR probeShould be considered to not install 180 vacuum chamber this shutdown:NMR probe can be installed in chamber during magnetic measurement180 dipole power supply stability could be evaluated during magnetic measurement with NMR probe read backs. Fabrication lead time is a concern.Can chamber welds could be tested during magnetic measurement?
Overall Layout*IP264 mLEReC-I (1.6-2MeV): Gun to dumpSRF gun used as a booster cavityMove BPM close to 180 magnet combine with PM.Add Quad and Skew Quad CorrectorsH & V CorrectorsAdd Quad and Skew Quad Correctors
*Drawing comes from VAT.M. Mapes measured one of the new VAT valves that are in hand and found the aperture on the valve flanges on both sides in 2.480.Mike will check with VAT on the configuration of the shielded section in the valve.Mike B. is checking if we should be concerned about the transition from the standard tube I.D. 2.375 to the valve I.D. 2.48.
PS Layout Phase 1*
PS Layout Cooling Section*
Racks ordered on 02:00 AIPBrahms Trailer 1002 D Racks*
Quad/SQCorrector 4.13 EMITTANCE SLITPROFILE MONITORLOW FIELD SOLENOIDHIGH FIELD SOLENOIDkhBPMBPMBPM + YAG + SlitAssembliesPROFILE MONITORBLUE RHIC BeamYELLOW RHIC Beam180o Dipole Magnet Neighborhood IVH/VCorrector
See slide #2EMITTANCE SLITBPMPROFILE MONITORHIGH FIELD SOLENOID20 DIPOLEkhQuad/SQCORRECTORPROFILE MONITORBLUE RHIC BeamYELLOW RHIC BeamBLUE RHIC BeamYELLOW RHIC BeamTRANSPORTSOLENOIDCornell, Wire ScannerOD=1.50 ; ID=1.38ERL, Profile MonitorID=1.87BPM w/ ERL ButtonsID=2.3720o Dipole Neighborhood IV
Large Dia. BPM Housings (4.8 ID), 28mm buttonsOrder Placed with MPFFinal Design Review 6/23/2015, no issuesMPF approved to start fabrication Increased number of button first articles for 2 BPMs one standard, one 180 magnet specialMPF updated delivery scheduleAgreed on vacuum bakeout for componentsMPF will vacuum bake buttons @900C/1hr during brazingMPF will vacuum bake housing @450C/48hrBNL will vacuum bake 1st article housingFirst Article delivery buttons 9/12/2015First Article delivery housing 10/01/2015BPMs in Cooling Section(14 Locations)
Cooling Section Standard Profile Monitors*RF impedance design approved (Peter T.)Ferrite ring mounting design complete. CMD5005 material.Requisition for commercial vacuum linear stage, requisition completeYAG screen/mirror holder design complete.Fabrication drawings for YAG screen/mirror holder and vacuum chamber.Update design for ground fingers.Stage Assembly(Linear Feedthrough)Zero Length adapter flangeProfile MonitorYAG Screen Assy.
RF impedance analysis completeChamber design completeNeed approved fabrication drawing (CO with MPF?)Design of RF impedance grounding fingers definedDesign of RF impedance ferrite configuration and mountingCooling Section hybrid BPM, PM, Slit*
Notes:Mirror thickness specifiedBoth Hybrids PM, Slit, BPM systems will be 3 position vacuum translating stage drives. The second hybrid will substitute the slit position (which is not needed) for a fault study beam stop.Dan transverse position accuracy of the vacuum translating stage will order 2 and measure.Angle mount windows ordered (7 units). The windows will be coated with a thin metallic coating by the vendor (KL). The Yag crystals will be coated with a thin metallic coating to dissipate charge. Dan Steski can do it. CS has preliminary drawings for standard profile monitor for cost estimate. Need to update and check final drawings.The grounding requirements for the hybrid head has been revised. Grounding fingers and mounting frame defined.The standard profile monitor will be modified for grounding fingers in the inserted position. TBDThe emittance slits needs grounding fingers New grounding finger hardware defined.
Cooling Section PM meeting*
Cooling Section Emittance Slits*Requisition for commercial vacuum linear stage.Fabrication drawings complete and approved.Central Shops requisition approved for vacuum chamber and W slit.The slit needs to be grounded at the vacuum chamber when scanning.Delivery dates: shifter, vacuum chamber, W slit, mounting hardware.
LEReC collimator thickness considerations*P. Thieberger 9/8/2015Ranges of electrons in Tungsten. The Continuous Slowing Down Approximation (CSDA) ranges obtained from the NIST ESTAR data base are distances along the electron zigzag trajectories. They exceed the penetration depth by the so called detour factor obtained as shown on the next slide.
LEReC collimator thickness considerations*P. Thieberger 9/8/2015Conclusions
For Phase 1, a collimator tungsten thickness of 0.4 mm would be adequate while 0.9 mm would be needed for Phase 2
It would be advantageous to choose the thinnest possible material to alleviate alignment issues and to reduce slit scattering
In any case thicknesses larger than 1 mm dont seem to be justified for this project.
Beam line bellows & 180 accordion bellows purchase orders.Standard Chamber Length defined NEG coating underway180 chamber 316L vacuum annealed to 900C after welding.180 chamber in shops, 20 chamber in shops 2 onlyTest chamber welded and measured. Shielded valves on orderDC Gun shielded valves and vacuum equipment.
20o Dipole Magnet*Requisition approved SOW 2 magnets by 10/1/2015.Order Placed 5/6/2015 Everson TeslaEstimated Delivery 1st two magnets 10/1/2015Distance Between Pole Faces = 10.4 cm (4.1 in.)Magnet Vertical Gap = 10 cmVacuum Chamber V Aperture = 9.5 cm (3.74 in.)
*180o Dipole Magnet Revised
Buckley magnets complete 8/20/2015?? + 6 weeks shipping + customs.Alpha Magnetics update: 1st production magnet + 9 more in house.Magnetic Measurement ordered and received 1% and 0.1% 3D probes 3D Probes being calibratedPreliminary measurements complete.Design support stand assembly provide space for mu metal shields, separate beam pipe stand support. Fabricate StandsMagnetic shielding analysis (Wuzheng).Design prototype mu metal shields and supports - measure.Compensating and Matching Solenoids*
Compensating and Matching Solenoids*Feed the BPM cables through a common hole in the shielding for each BPM station (4 cables /hole). This will require a 90 degree type-N connector on the LDF1-50 Heliax cable (0.37" OD) that connects to BPM button feedthrough connector. Would you have the design add the cables and connectors to the model and choose an appropriate place for the penetration, respecting the minimum cable bending radius?
HALL PROBE / SOLENOID GRANITE TABLE (Measurement Schedule)August 3-7: complete permanent magnet measurementsAugust 10-14: August 17-21: reconfigure Hall probe (Sullivan), then resurvey (Karl)August 24/25: Jain reviews survey data, first solenoid (Sauerwald)August 26 Sept. 30: move solenoid granite table out of AnnexOctober first solenoid complete, goal of 2 per week.
Compensating and Matching Solenoids*
Compensating Solenoids Measurement*We have done a preliminary scan (on-axis only) to check out the measurement system and the results seem to be good in terms of magnet performance. We tuned the main coil and bucking coil currents to match the central fields expected from Wuzheng's calculations. An adjustment of about +2% had to be made to the design currents to get the design fields.
The on-axis field drops below 1 Gauss level at approximately +/- 18 cm from the magnet center. This is a faster fall off than the +/- 21 cm expected. I am not sure if the earth's field of about 0.2 Gauss is helping with this.
The second field integral at the adjusted current settings comes out to be 4.019E-05 T^2.m, which meets the 4.0E-5 T^2.m requirement.
LEReC Cooling Section Design Room*LF & HF solenoid and 20o dipole magnets fabrication drawings (KH)Beam Diagnostics: BPM chamber and buttons (VDM)Beam Line 5 bellows with shields fabrication drawings (GW)20o dipole vacuum chamber for impedence review (KH)180o dipole fabrication drawings (KH) Spectrometer magnet (180o dipole) revisions (KH) 180o vacuum chamber + large sliding bellows fabrication drawing (KH)Beam Diagnostics ES W slit & chamber fabrication drawings (VDM)20o dipole vacuum chamber fabrication drawings (KH)Cable tray and penetration drawings and excel sheet (AF)Beam Diagnostics: standard PM fabrication drawings (GW)Beam Diagnostics: special hybrid ES/PM/BPM fabrication drawings (GW)Beam line solenoid/BPM stands & vacuum chamber stand (VDM) Beam line magnetic shielding (VDM)20o magnet stand drawing (KH)180o magnet w/hybrid BPM stand drawings (KH)Magnetic shielding drawing and solenoid magnetic measurement test stationHF dipole, quadrupole, and skew quadrupole corrector drawings
LEReC Design Room Source Design Work*DC Gun Vacuum Chamber Fabrication Drawings (JH)DC Gun SF6 Pressure chamber specification control drawings (JH)DC Gun cathode cooling design for Karl S. Cornell (JH) DC Gun stands (JH) DC Gun to Booster SRF booster cavity beam line (JH)DC Gun cathode insertion drive (WJ/VDM)DC Gun cathode coating system vacuum chamber (PC)DC Gun cathode transfer load lock and vacuum chamber (WJ)Cathode production coating system design (BM)