Modular cavity status and test Modular cavity status and test plan plan Daniel Bowring Overview Daniel Bowring RF Measurements Experimental Plan Fermi National Accelerator Facility Photos May 30, 2014
Overview Modular cavity status and test plan Daniel Bowring Overview 1. Frequency and Q have RF Measurements been verified. Experimental Plan 2. The cavity has not been Photos delivered to FNAL yet. Endplate flanges are mechanically weak, making the RF joint unstable. 3. We believe this is a solved problem. 4. Meanwhile, what is the experimental plan? (Plus: photos.)
Modular cavity status and test plan RF Measurements Daniel Bowring Overview RF Measurements Experimental Plan Photos
We have verified the RF properties of the cavity. Modular cavity status and test plan Daniel Bowring Overview RF Measurements Experimental Plan Photos (Quantitative data on next slide.)
RF design vs. measurement Modular cavity status and test plan Daniel Bowring Property Sim. Meas. Notes Overview Frequency (MHz) 804.99 804.65 Measurement RF Measurements w/o vacuum Experimental Plan Unloaded Q 0 25602 24383 Photos Loaded Q L 11861 15141 Not under- stood. Bad RF adapter? 804.70 1.1 24000 804.65 1.0 Frequency (MHz) 804.60 22000 804.55 0.9 beta 804.50 20000 Q0 0.8 804.45 18000 804.40 0.7 804.35 16000 804.30 0.6 3040 50 60 7080 90 3040 50 60 7080 90 3040 50 60 7080 90 Torque (inch-pounds)
The recovery/shipping plan has now been vetted. Modular cavity status and test plan Daniel Bowring Overview RF Measurements Experimental Plan ◮ Full design analysis and recovery discussion took place Photos yesterday evening: https://indico.fnal.gov/contributionDisplay. py?sessionId=16&contribId=133&confId=8326 ◮ Minimally invasive plan gets the cavity to FNAL ASAP. ◮ Staged “upgrades” possible if the minimally invasive fix proves insufficient.
Modular cavity status and test plan Experimental Plan Daniel Bowring Overview RF Measurements Experimental Plan Photos
Experimental goals of the modular cavity Modular cavity status and test plan program Daniel Bowring Overview The modular cavity allows We can test different RF Measurements us to collect “clean” data. materials and surface Experimental Plan treatments. ◮ Mimics coupling strategy Photos in a cooling channel. ◮ Beryllium vs. copper ◮ Strongest surface E -field ◮ Half-hard vs. (by 5 × ) is on-axis. fully-annealed Cu ◮ Chemical polishing vs. electropolishing ◮ Other materials?
Using the modular cavity Modular cavity status and test plan Daniel Bowring Overview Sequence of runs What does a single run look RF Measurements like? Experimental Plan 1. Chemically-polished Cu Photos i. Inspection plates, B=3/0 ii. Conditioning 2. Chemically-polished Cu plates, B=0/3 iii. Inspection 3. Beryllium plates, iv. Establish safe operating B=TBD gradient 4. Fully-annealed Cu plates v. Inspection 5. “Other” (15 cm body, Cu alloy plates, etc.) Notation: B=3/0 denotes a run at 3 T followed by a run at 0 T.
Frequent inspection help us understand when Modular cavity status and test plan damage occurs. Daniel Bowring Overview RF Measurements ASC: High-res scanner Experimental Plan Photos ASC: Digital microscope
Modular cavity status and test Photos plan Daniel Bowring Overview RF Measurements Experimental Plan Photos
Modular cavity status and test plan Daniel Bowring Overview RF Measurements Experimental Plan Photos
Modular cavity status and test plan Daniel Bowring Overview RF Measurements Experimental Plan Photos
Modular cavity status and test plan Daniel Bowring Overview RF Measurements Experimental Plan Photos
Modular cavity status and test plan Daniel Bowring Overview RF Measurements Experimental Plan Photos
Modular cavity status and test plan Daniel Bowring Overview RF Measurements Experimental Plan Photos
Modular cavity status and test plan Daniel Bowring Overview RF Measurements Experimental Plan Photos
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