Status of the Diamond Storage Ring RF Systems. Morten Jensen on behalf of Diamond Storage Ring RF Group

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1 Status of the Diamond Storage Ring RF Systems Morten Jensen on behalf of Diamond Storage Ring RF Group

2 Content 1. General Operational Status 2. Main issues and causes of trips ma + operation Qext modification 4. System upgrades and improvements 5. RFTF

3 General Operational Status Hours MTBF since per system previous (Hrs) fault Inserti on Device, 27 Hours since previous fault Number of Trips Power Conve rte rs & Magne ts, Con trols (S/W ), V acu um, 27 First 15 year of operation 10 Insertion Device, Power Conve rte rs & Magne ts, 34 Controls (S/W ), 18 V acu um, System 1 Trip 5 System 2 trip Total # Faults 2007 by Category PS S, 13 System 1 Trip System 2 trip 40 First year 2008 of to date operation Beam Tri ps (Beam line), 40 Typical run following warm Warm up up Cavity 1 Only System 1 MTBF System 2 MTBF Utilit ie s, 3 Time since last trip (not a trip) Rolling MTBF (Sys 1 and 2) Cryogeni cs, 1 MTBF System 1 = 114 MTBF System 2 = Hum an Error, 19 Total # Faults 2007 by Category MTBF of RF Systems 30 MTBF Total Year Front to Ends, date 8 St orage R ing RF, 13 6 Time since last trip (not a trip) Rolling MTBF (Sys 1 and 2) MTBF System 1 = 114 MTBF 0System 2 = 25 Beam Trips (SR), 18 Run 7 Faults and MTBF Inject or (Linac, Booster & RF), 8 PS S, Run 13 7 Beam Faults Trips (SR), and 1MTBF 8 25 Diagnostics, 8 Cooling Plant & Air Con., 2 Warm up Controls (H/W), 7 MPS, 13 Unclassi fied, 4 Storage R ing RF, Hrs Dual Cavity Beam Tri ps (Beam line), 40 Hum an Error, 19 Injector (Linac, Booster & R F), 8 D iag nostics, 8 Controls (H/W ), 7 MTBF of RF Systems 465 MPS, 13 Fro nt Ends, 8 Un cla ssi fie d, 4 Utilitie s, Run 12Number Cooling Plant & Air Con., Fault Number C ry o ge ni cs, 1 Fault Number 0.0 Cav ity 1 tr ip s Cavity 2 trips IORun T trips N umber Cooling trips Arc trips Oth er/unknow n Typical run following warm up Running MTBF MTBF per system (Hrs) Number of Trips System 1 MTBF System 2 MTBF MTBF Total Year to date 2008 to date Cavity 1 Only Run N umber Total MTBF Year-todate (hrs) Run Number Dual Cavity Cavity 1 tr ip s Cavity 2 trips IOT trips Cooling trips Arc trips Other/Unknow n Running MTBF Total MTBF Year-todate (hrs)

4 Main issues and causes of trips Amplifier 1 IOT trip with stored beam System 2 follows on MPS. Note increase in power on system 2 as system 1 is tripped. Beam 178 ma Amplifier 2 Power ramp Beam spirals in on loss of RF Beam lost Amplifier 1 OFF Cavity field decays IOT Short Circuit indicating HV breakdown

5 Main issues and causes of trips Fast Cavity Trip 3 Trip on Reflected Power 2 Rapid increase in forward power to compensate 1 Rapid drop in cavity field Cavity field collapses in 2-3 turns no longer a high Q cavity

6 Main issues and causes of trips Synchronised Fast Vacuum Data Acquisition Cavity 1 trip Cavity 2 after waveguide bend Gas on all Cavity 1 Gauges Gas travels through the cavities but not around the cold waveguide bend Cavity 1 Cavity 2 Beam pipe (Cavity 3 space)

7 200 ma + operation Qext modification Beam stored with LLRF operating in Closed Loop 300 mode increasing stability 250 Single Cavity Operation Theoretical Robinson Threshold current Beam current (ma) Cavity Voltage (MV) Closed loop stored current Theoretical threshold current Open loop stored current Separate RF Feedback is not required to maintain Robinson Stability Open Loop current is less that theoretical limit due to voltage and phase variations

8 200 ma + operation Qext modification Qext is modified by installation of a 3-stub tuner between the circulator and the cavity coupler Qext can be adjusted for particular operational parameters i.e. voltage and beam current Reflected power (kw) Original Q Beam Current (ma) Original Qext 2.4 E 5 Modified Qext 1.65 E 5 Single cavity measurements Non zero reflected power due to the cavity being slightly off resonance Modified Q (optimum 300mA dual cavity operation)

9 200 ma + operation Qext modification Thermal Plots of Window Temperature Distribution 3-stub tuner = Standing Wave How great is the risk? No beam 104kw at - 40deg off resonance Max T = 40 Deg C 210 ma, Q ext = 2.4x105 (3-stub tuner fully retracted) 210 ma, Q ext = 1.65x10 5 Max T = 34.8 Deg C Max T = 34.8 Deg C

10 Main Upgrades in the previous 12 months Second Compressor installed and commissioned Compressor 1 and Cold Box serviced loss of performance after two weeks operation maintain operation by continuous flow of LN2 Helium was contaminated reducing efficiency of top heat exchangers Cold box warm-up x 2 discarded helium in cold box followed by multiple pump and purges Operation resumed Nominal operation re-established No direct impact on operation

11 Main Upgrades in the previous 12 months New TED IOT to type (one IOT only in R&D cavity) RF Load upgrade for full power reflected capacity Amplifier Upgrade incl. (new inductor, adjustable PSU frequency ) LLRF software loop to compensate for beam current Dedicated cooling for the drive amplifiers Drive amplifier tuning upgrade IOT Enclosure built and commissioned Measurement patch panel partly installed MPS upgrade to enable operation of RF New window bake out boxes designed and built

12 RF Test Facility High voltage and high power test of accelerating modules Pulse and cw conditioning of cavities RF supplied from any one of three high power amplifiers Connection to helium dewar, LN2 supply and cold helium return via MCL Main structure complete by end of October 2008 Classical M&E complete mid December 2008 Technical Services incl. Waveguide and Cryogenics complete by end of January 2009 Facility ready for operation early 2009

13 RF Test Facility What will it look like?

14 RF Test Facility Current Status: Services relocated, piling complete Foundations cast Walls Cast Roof shuttering being installed Door being manufactured

15 Thank you for your attention!

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