ESS-Bilbao Initiative Workshop. SNS Linac experience
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ESS-Bilbao Initiative Workshop. SNS Linac experience

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SNS Linac experience 

SNS Linac experience 

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ESS-Bilbao Initiative Workshop. SNS Linac experience ESS-Bilbao Initiative Workshop. SNS Linac experience Presentation Transcript

  • ! quot; ## $ % quot;
  • March 2000 Dec. 15, 1999 Sept. 2005 2 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • ORNL was responsible for integration, installation, commissioning and operation Need a strong central team to take intellectual ownership of the accelerator 3 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • 2003 2002 2004 2006 2005 Front-End DTL/CCL SCL DTL Tank 1 Ring DTL Tanks 1-3 Target • & quot;quot; ' quot; ' ( ' # ) & quot; * quot; '( ' #) +, •- quot; ) # ' ' & ( 4 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • ! quot; # $% 1177 MW-hrs Fluence (MW-hrs) Power (kW) 480 MW-hrs 210 MW-hrs 127 MW-hrs •. / ' ' ( ) ( ( %' / & 5 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • !$& output Ion Source • 402.5 MHz Radio-Frequency Quadrupole • # 0/ & 1( / '2 ( •./ & # ( 3 45 ( ' 5 – *) ' ), 6 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • ' % output • 6 Tanks •210 drift tubes •PM quadrupoles • 2.5 MW klystrons (402.5 MHz), 1 per tank • Experience with PM quadrupoles is fine • Minimal beam loss / activation observed • Robust structure 7 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • output • 4 modules • 48 segments •5 MW klystrons (805 MHz), 1 per module CCL is also a robust structure - Issues with RF induced gate-valve failures Some beam loss near the CCL entrance and exit 8 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • % % • 6- quot;#quot; 7 • 6- # 8 &quot; (/ • %) ' quot; / ( Medium beta – 0.61 ( ' •9 : • & * ; <= ; , High beta – 0.81 • SCL is flexible • Issues with accessories (HOM couplers, piezo tuners, …) • Unexpected low level of beam loss 9 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • 10 Eacc (MV/m) Eacc (MV/m) 0 0 2 2 4 4 6 6 8 8 10 10 12 12 14 14 16 16 18 18 1a 1a •$ •9 •> •6 1c 1c 2b 2b ( 3a 3a 3c 3c &' Aug_08 Aug_08 Managed by UT-Battelle ) 4b 4b design design 5a 5a ( /( ( for the U.S. Department of Energy 5c 5c 6b 6b 7a 7a ' Nov_08 Nov_08 7c 7c 8b 8b 3 ?5 #quot; 9a 9a 9c 9c )#@ ' 10 10 bb 11 11 aa 11 11 cc 12 12 bb 12 12 dd / 13 13 bb quot; ( /quot; β + 25% + 25% 13 13 dd '& ' 14 14 bb Presentation_name 14 14 dd Cavity number Cavity number 15 15 bb /#quot; *4 A 15 15 dd 16 16 bb 16 16 ( dd 17 17 bb 17 17 dd ' 18 18 bb 7, 18 18 dd 19 19 bb #quot; 19 19 dd 20 20 bb 20 20 dd ' 21 21 bb 21 21 dd β 22 22 bb 22 22 dd 23 23 bb 23 23 dd
  • quot; •6 quot; 0/ ' “( ” •6 ;5 ) & #quot; quot; ( (/ quot; –B (quot; *quot; C quot; ' • # , ' quot; –6 / ' quot; ' ' ' ( –9 30 No limits up to 22 MV/m 60 Hz collective limit Individual limit or low rep rate collective limit (<20 Hz) in 25 closed loop Lorentz force detuning Individual limit or low rep rate collective limit (<20 Hz) in open loop Average Eacc (MV/m) 20 Quench (hard, Eacc<10 MV/m)) 15 HOM (1cavity disabled, 5 limited by large coupling) 10 Coupler Heating 5 Electron loading 0 (EG heating, gas burst, quench) Medium beta cavity High beta cavity 0 10 20 30 40 50 60 No. of cavities 11 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • !$ % 402.5 MHz, 2.5 MW klystron 805 MHz, 5 MW klystron DTL RFQ CCL 805 MHz, 0.55 MW klystron DTL Klystron CCL Klystron (6) (1) (4) Warm Linac 86.8 MeV 2.5 MeV SCL KlystronsMeV 1000 SRF, ß=0.81, 48 cavities 379 MeV 186 MeV SRF, ß=0.61, 33 cavities SCL from CCL Linac • Warm linac has 10 independently powered cavities 1 (81 total powered) • SCL has 81 independently powered cavities Many values to set w.r.t. the beam A lot of Equipment to keep running!!! 12 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • ( % ) % Longitudinal phase advance •Each cavity has a through 1st DTL tank unique response Different RF (signature) to phase and amplitudes amplitude scans TOF Change •Phase scan signature matching method uses model to match measurements and determine RF amplitude and phase setpoints RF Cavity Phase •- ' ( * ' /( , ( '& ' ' // • ' >B (quot; /( ' 13 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • % ) % Downstream Pickup TOF Black = measured Red = sine fit RF Phase δβ • quot; (quot; ' /( ( & –6 ( >B ' A & /( ( >B ) quot; •$ / '# &D – &quot; /( # quot; @ quot; /quot; #' ( –B@ & >B / 14 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • % % !$ % Arrival Time: Cavity: • ( ( ( # ' () quot; >B / ( ' / quot; >B quot; /( (E –F ' ( ( quot; –G/ & #quot;/ quot; >B ' • (/ quot; & –% 6- )( # # & ' quot;quot; >B 15 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • * + $% ! + quot; 300 6 Phase Change 200 4 Measured Error Measured Error (deg) Phase Change (deg) 100 2 0 0 -100 -2 -200 -4 -300 -400 -6 1 7 13 19 25 31 37 43 49 55 61 67 73 79 Cavity • ' ( / ( ## quot; /( (/ (# # &) / ( •% #/ & quot; ) (1 2 •H ( ') ) 4( ' • Managed(by UT-Battelle $ ' quot; 16 for the U.S. Department of Energy Presentation_name
  • * , % -./ Consider this part of the scan •6 / ' /( # 6- •F ' ' 0/ #quot; (quot; / quot; 17 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • , % * From Beam Loss From Current Transmission •6 quot; / quot; #quot; 18 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • * 0 % -./ RMS Bunch Length Halo tail ??? • quot; # / quot; '& – / quot; ( quot; / * quot;, – / quot;- * ( , 19 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • Total Expected Beam Loss & Hottest Expected Spot Meet Requirement 4 E xpected Total B eam Loss quot;H ot spotsquot; 100 Linacs, all errors 100 Linacs, all errors 3 w orst case Beam Loss (W) expected loss Frequency 2 1 0 0 1 2 345 6 7 8 0 40 80 12 0 16 0 20 0 P tota l (W ) W (M eV ) 20 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • ) % 25 DTL-CCL Transition CCL-SCL Transition 1 0 L in a cs , a ll e rro rs 20 + m is m a tc h Beam Loss (W) P m in 15 Pave Pm ax 10 5 0 0 20 40 60 80 100 120 140 160 180 200 W (M e V ) 21 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • ) • quot; quot; . %- E6 6 - •$ quot; ( ( 6- 22 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • + Residual activation @ 1ft after ~ 48h Prompt radiation due to beam loss Integral BLM dose [Rad] Beam Loss monitor # • – – • •! – quot; ! #$ % &' quot; ( –) % ( –! quot; % ( 23 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • 24 •- Rad/C Rad/C • . ## SC L_ -50 0 50 100 150 200 250 SC Di a 0 50 100 150 200 g: L_ B D LM SC i ag 00 ) L_ :B LM Di Managed by UT-Battelle 01 SC ag L_ :B L c M D 02 SC i ag c L_ :B LM Di for the U.S. Department of Energy 03 SC ag L_ :B L c M ' /( Di 04 SC ag c L_ :B D LM 05 SC i ag Beam Loss = L_ :B L c M D 06 SC i ag c L_ :B LM Di ( 07 SC ag c L_ :B LM Di 08 ag SC L_ :B L c 1/24/08 300 kW M D 09 6/17/08 - 480 kW SC i ag c ) L_ :B 12/15/08 - 650 kW LM Di 10 SC ag L_ :B L c M Di 11 SC ag c L_ :B LM Di 13 ag SC Warm Section L_ :B L b M D 14 SC i ag c L_ :B SCL Loss LM BLM SCL Beam Loss Di 16 SC ag L_ :B L b M Di 17 SC ag c L_ :B D LM 19 SC i ag L_ :B L b Presentation_name D M 20 SC i ag L_ :B L c M D 22 SC i ag beam loss signal L_ :B L b M Di + 23 SC ag L_ :B L c M D beam power on target 25 SC i ag b L_ :B D LM 26 SC i ag 1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49 52 55 58 61 64 67 70 73 76 dt L_ :B L c M D 2 SC i ag :B 8b L_ LM Di 29 SC ag c L_ :B LM Di ag 31 b :B LM 32 c 1/6/2009 11/2/2008 12/15/2008 11/24/2008 10/13/2008 over 3 week run
  • ! % * + !% Linac Activation 35 1400 3 30 days after run 1 1200 <SCL> 25 1000 3 mrem/hr MW-hrs 20 800 charge 1 15 600 10 400 5 200 0 0 Ju 7 Ju 8 M6 D7 M7 D8 8 Se 7 Se 8 -0 -0 -0 0 0 -0 0 0 -0 p- p- n- n- ar ar ec ec ec D Run •I ' quot; / # quot; quot; ( • 6- J ' # ) quot; ( ' 25 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • Ring Foil Activation Average SCL Residual Activation summer 07 80 Avg. Warm Section Activation 600 summer 07 08 Winter 12 hr 70 Summer 08 500 winter 08 cooldown Fall 08 60 spring 08 400 mRem/hr 50 mRem/hr Fall 08 40 300 30 200 20 100 10 00 7 8 8 7 8 9 07 08 4/28/200 8/6/2007 11/14/20 2/22/200 6/1/2008 9/9/2008 12/18/20 3/28/200 00 00 00 00 00 00 20 20 /2 /2 /2 2 1/2 9/2 4/ 8/ 6/ 8 2 8 7 07 8 08 9 8/ 6/ 9/ 4/2 2/2 3/2 /1 /1 11 12 Run Run • 6- (/ /(/ 0/ & (/ ' / & •6 > ' / (/ ) quot; (& 26 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • ! % * + $ quot; ' Summer 2008 1.2 1 Relative Activation SCL 2_3 SCL_12-13 0.8 SCL 16_17 0.6 SCL 32 0.4 Ring Foil Ring A13b 0.2 0 0.00 5.00 10.00 15.00 20.00 25.00 Days after Production • /'' # (1 quot; 2 • ' (( ' quot;quot; quot; / quot; ( #& quot; quot; • & quot; /' / 6- ) &quot; / 27 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • ) , % 10 nsec laser pulse, 2.0E-04 20 µsec beam pulse BckGrnd Single electron Bump15 Laser laser stripping is Laser15 1.5E-04 Enhanced Beam Loss used for profile loss measurements in 1.0E-04 the SCL 5.0E-05 0.0E+00 b 12 16 20 24 28 32 00 a 04 08 M ND ND ND ND ND ND M M BL BL BL : : : : : : ag ag ag ag ag ag : ag : : Di Di Di Di Di Di ag ag Di L_ L_ L_ L_ L_ L_ Di Di L_ SC SC SC SC SC SC L_ L_ SC SC SC •F ' - K ;@ quot; ' 6- (/ ' (/ •6 ) / quot; #quot; ( 3@ ) quot; *L # # 4, •I #K quot; quot;E M # # ) K3 Equot; K@ quot; E) quot; • for the U.S. Department of Energy quot; ;, quot; # # quot;Presentation_name *K ) quot; 28 Managed by UT-Battelle
  • 1 ) quot; % 7 6 Beam Loss (E-4 Rad/pulse) 5 BLM03 BLM07 4 BLM10 Linear (BLM03) Red= CCL4 vacuum 3 Linear (BLM07) Linear (BLM10) Others =2 SCL beam loss 1 ~ 3 hours 0 0 2 4 6 8 10 CCL Vacuum (E-7 Torr) • 6- quot; 66-4 //quot; •F quot; 6- '& #/ ( &' ' •B quot; 6- () quot; &) ## • 66-4 //quot; ) #@ ( / ' 29 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • • 30 /quot; * ) Managed by UT-Battelle •H quot;( relative loss – relative loss SC –< L_ – >B for the U.S. Department of Energy ' – 9 ## SSC Di a ' CL g L__ :B quot; SSC DDia L M C L i agg 2 : L__ :BB 0 i / 00 0.50.5 11 1.51.5 22 2.52.5 SS DDaia LL M b CC gg M22 L : L__ :BB 10 ( '& , SS DDi LL M c b a CC i agg M22 L_ :B 31 L_ : L SS DDa BL M bc CC i ig M2 # # L_ a:g: 2 3 quot; L_ BL 4 SS DDa BL c b CC i ig M2 quot;' 6 L_ a:g M2 _ BL 4 ' SC LDD :BL bc SC i aig M2 L_ a:g M2 B7 ) _ i LM 6 SC LDDa :BL c b SC ig: M L a B 29 L L7 H _Di g:B M 2bc / E_ 3 ( SBT Daig:B LM0 H CL_ ag L 2c EB _D :B M 9b H T_ Dia L 3 2 H EB D iag:B M3b E 0 i g: H BT T_ag BL M0 c EB _ Di :B LM 2 quot; Presentation_name H TD a gL 3 2 E ia M H BT _D g: :BL05 b EB _ ia B Ma L T_Dia g:B M 02 0 H D g: LM7 EB iag BL 0a *N O )% SCL Beam Loss with Local Bumps T_ :B M0 5a D LM 9 ; ia SCL Beam Loss with Local Bumps g: 07a BL M 09 'P , 8 mm Cav on 5 mm Cav on 8 mm Cav off 5 mm Cav off V Bump 23 H Bump 23
  • 31 Normalized loss SC L_ D • SC iag •6 L_ :BL M D 0 0.5 1 1.5 04 b SC iag :B ) •- ) L_ Di LM0 5c SC ag L_ :BL Managed by UT-Battelle M D 07 b SC iag :B L_ LM Di 08 ## c SC ag for the U.S. Department of Energy (/ L_ :BL M Di 10 b SC ag quot; L_ :BL M Di 11 c SC ag L_ :BL M Di 13 5% reductionquot; b SC ag 10% reduction 15% reductionquot; L_ :BL M #' Di 14 c SC ag L_ :BL M Di # 16 b SC ag () L_ :BL M Di 17 c SC ag L_ :BL M Di ( # ## SC ag: 19b BL L_ M Di 20 c ! SC ag :B L_ LM D quot; 22 b SC iag Quad Strength Sensitivity L_ :BL M D quot;' 23 '& c SC iag L_ :BL M % D Presentation_name 25 b SC iag quot; L_ :BL M D 26 c SC iag L_ :BL M D quot;/ 28 quot;Q b SC iag :B L_ Di LM2 9c SC ag L_ :BL M Di 31 ag b &% :B LM 32 c along the SCL quadrupole strength Progressively reduce
  • 2% ! % 3! •< ' 7 '6 (/ *< 7 6 , quot; #quot; –6 .6 <= / #quot; / ' ( '& •6 quot; #quot; –$ ) '& quot; quot; @ 32 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • quot;% Beam Position vs. mini-pulse slower slow •. ' # ' ' –- %* ) ,L % *# , • % // L ) / ( / –B / ( /quot; quot; •- % 33 Managed by UT-Battelle –H (( ( ) )( quot; for the U.S. Department of Energy Presentation_name
  • % •$R ?& / C •I# 3& # 3? quot; ) 5 & • quot; ' ) ' –quot; quot; # quot; (E ) ' A@ / – ) # quot; ) ) (( @ quot; ( *& , •! ( quot; @ ) ' ( ' ' / #/( ' ' quot;quot; ' ( ' ' ) 34 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • % quot;quot; • ( ' / quot;quot; ' ( # ' ) 1' # (2 SNS: March 2000 It is possible 35 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • 4 + Ring Injection Loss correlated with RFQ resonance error RFQ resonance error 3 kHz Injection Dump Loss Few Watts Beam Loss 7 minutes •@ / @ ( 36 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • * Accumulator Ring Collimators Accumulator Ring: 1 GeV Front-End: Compress 1 msec LINAC Injection Extraction Produce a 1-msec long pulse to 700 long, chopped, RF nsec H- beam 1000 MeV RTBT 2.5 MeV HEBT Front-End LINAC Liquid Hg Target Chopper system makes gaps 945 ns mini-pulse Current Current 1 ms macropulse 1ms 1 ms macropulse 1 ms 37 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name
  • ! + ' !quot; # $ $ % % &quot;' ()# ! quot; # $ $ * * + ,quot; - % % -. ,quot; - /quot;' ' 0 1 0 )/ ) 23 4)# , . 0 ) - quot; quot;' 5quot; 0 6 6 +) ,quot; - 6* 66 % % %8 8 ) quot; 17 0 *8 ) 4/ ,1 5quot; 4/ & * 38 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name