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IR-2 Status

IR-2 Status. 9 Oct. 2003 Stan Ecklund. IR 2 Issues. HOM and Synchrotron Radiation Vertex Bellows Cooling Addition 2002 Q1/Q2 Bellows – more HOM absorbers in 2002 Smoother Q2R forward crotch chamber Q5R vacuum flange heating from HER B1 SR fan Orbit Sensitivity

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IR-2 Status

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  1. IR-2 Status 9 Oct. 2003 Stan Ecklund MAC Review – IR 2 Status

  2. IR 2 Issues • HOM and Synchrotron Radiation • Vertex Bellows Cooling Addition 2002 • Q1/Q2 Bellows – more HOM absorbers in 2002 • Smoother Q2R forward crotch chamber • Q5R vacuum flange heating from HER B1 SR fan • Orbit Sensitivity • Require LEB aimed at Luminosity Monitor • IP angles constrained by backgrounds • HEB – B1 fan aimed at High Power Dump missing Q5R chamber • Quad motion from beam current – HERO and LERO feedbacks • Installed Position Monitoring Systems • Vacuum • Q2 Chamber Leak June 2003 • Q2 Chamber NEG pumps • Radial Ion Pumps MAC Review – IR 2 Status

  3. Near IR MAC Review – IR 2 Status

  4. MAC Review – IR 2 Status

  5. IR Vacuum Chambers MAC Review – IR 2 Status

  6. Spectrum From IP BPM • B-side (Forward) IP BPM • Gated spectrum analyzer in the abort gap • Data from May 5 2002 Sasha Novokhatski MAC Review – IR 2 Status

  7. Forward Vertex Bellows – Before Cooling Hottest Point according to model (300 C) T_VTX2 Thermocouple ( dT = 105 F = 58 C) Beryllium Vertex Chamber B1 Chamber MAC Review – IR 2 Status

  8. Forward VTX BLWS Cooling MAC Review – IR 2 Status

  9. Thermocouple Locations T_V0B270 On Ta foil, z=blws-70mm -y x=0,z=113 mm T_V1B270 Al Clam, end near IP, -y, theta=270 z=157 T_V2B270 Al clam, corner theta=270, z=17.5 T_VTX2 TC1: Forward alum clamshell (+y) T_V3B000 Inboard end of blws theta=0 T_V3B135 Inboard end of blws theta=135 T_V3B180 Inboard end of blws theta=180 T_V3B225 Inboard end of blws theta=225 T_V3B270 Inboard end of blws theta=270 T_V3B_O Inboard H2O out, -x +y T_V4B_O1 Collar H2O out -x T_V4B_O2 Collar H2O out +x T_V5B000 SS end of B1 Chamber theta =0 T_V5B180 SS end of B1 Chamber theta =180 T_V3B_AI Air in Bellows, top T_V6B_AI Air btwn B1 chamber & magnet,+y,z=295mm,slice3/slice4 MAC Review – IR 2 Status

  10. VTX Bellows Cooling Installation MAC Review – IR 2 Status

  11. Improved VTX Bellows Cooling • dT=40 F vs. 105 F before cooling • Time constant 100 sec vs. 220 before • Hottest location now cooled • Expect to handle 4 X HOM Power • Next design needs cooled absorber MAC Review – IR 2 Status

  12. Erratic Behavior Similar to Before MAC Review – IR 2 Status

  13. Three States MAC Review – IR 2 Status

  14. Flow Rate and Temperature Rise Measures Power MAC Review – IR 2 Status

  15. Power + Bunch Length factor MAC Review – IR 2 Status

  16. Power / Sum (Ib^2) MAC Review – IR 2 Status

  17. Synchrotron Radiation HeatingBy 2 Run, 2.4 A LER, 26 June 2003, Q2 and Q4 Chambers These are the thermocouples which were in warning at high LER current. First fill was 2250mA in pattern by2_t14_fb1200 and second fill was 2400mA in pattern straight by 2. Rnd. - Rect. transition, -y, bot, z=-20 LEB side,+x,y=0, small Cu finger, z=-2.8 m LER Q4 vac, +x, z=-3.64 next to flange MAC Review – IR 2 Status

  18. MAC Review – IR 2 Status

  19. MAC Review – IR 2 Status

  20. Orbit • LEB Aimed at Luminosity Monitor • Consistent with Backgrounds • HEB SR fan to High Power Dump • Beam Induced Magnet Motion • SY fan heating distorts vacuum chamber • Chamber pushes Magnet. • Feedbacks adjust dipole correctors to restore orbit MAC Review – IR 2 Status

  21. LERO Feedback MAC Review – IR 2 Status

  22. Alignment Monitoring • LVDT transducers • Tilt Sensors • New Systems • Water Level System • 6 sensors, 2 on each raft, 1 in each tunnel • Wire Alignment System • On A (Backward side) • Five (x y) pickups • Q2L, Q4L, Q5L • Support Tube to Tunnel (20 m) • Laser Tracker • On B (Forward side) • Q4R, Q5R, (4 each), Raft (2), Reference MAC Review – IR 2 Status

  23. Tilt Sensor Data Mark Petree MAC Review – IR 2 Status

  24. First Look at Angle change with Beam Current Change MAC Review – IR 2 Status

  25. Water Level Data • Note beam dependence on LRAFT (A side) sensors • Andrei Seryi IR breakout MAC Review – IR 2 Status

  26. Wire Alignment Data 0.2 mm full scale Zach. Wolf, Dave Jensen, Kris Dudley, Brenden Dix MAC Review – IR 2 Status

  27. Tracker Data Catherine LeCocq Robert Ruland MAC Review – IR 2 Status

  28. June 2003 Q2R Vacuum Leak • Leak started about 16:00 on Friday 27 June 2003 • Sig 9 and Sig 11 diodes indicate LER backgrounds. • Upstream LER cold cathode gauge VGCC3027 shows increase in pressure. • He leak check gives no indication. • When radial ion pump VP3012 was on it reduces A-side pressure indicating leak is on B-side (incoming LER) • Sat. eve leak checked flooding Support Tube with He. • Radial pump VP3012 failed after leak check on Sat. • Leak gets worse over holiday week. • Water seen on RGA on A-side. • Water to vacuum leak found in B-side Q2 vacuum chamber on Monday 7 July. New smooth chamber was in service since Nov. 2002. • VP3012 resistance increasing over days, but still too low. • Other water circuits checked ok. • Replaced chamber with original. • September startup not affected due to early NEG activation MAC Review – IR 2 Status

  29. Pressure Increase B side pressure lower than A side MAC Review – IR 2 Status

  30. Q2 water circuit pump out Release Water Pressure Pump circuit MAC Review – IR 2 Status

  31. July Pump Down and Now 1 nTorr MAC Review – IR 2 Status

  32. Q2 Leak from material flaw MAC Review – IR 2 Status

  33. Summary • Addressing Heating and Motion Issues • New Vacuum chambers needed by 2005 • Q2 chamber • B1 • Radial Ion pump • Bellows / SiC absorbers • … MAC Review – IR 2 Status

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