9 Oct. 2003 MAC Review – IR 2 Status 1

IR-2 Status

9 Oct. 2003

Stan Ecklund

9 Oct. 2003 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

9 Oct. 2003 MAC Review – IR 2 Status 3

Near IR

9 Oct. 2003 MAC Review – IR 2 Status 4

9 Oct. 2003 MAC Review – IR 2 Status 5

IR Vacuum Chambers

9 Oct. 2003 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

9 Oct. 2003 MAC Review – IR 2 Status 7

Forward Vertex Bellows – Before Cooling

T_VTX2 Thermocouple( dT = 105 F = 58 C)

Beryllium Vertex Chamber B1 Chamber

Hottest Point according to model (300 C)

9 Oct. 2003 MAC Review – IR 2 Status 8

Forward VTX BLWS Cooling

9 Oct. 2003 MAC Review – IR 2 Status 9

Thermocouple LocationsT_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

9 Oct. 2003 MAC Review – IR 2 Status 10

VTX Bellows Cooling Installation

9 Oct. 2003 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

9 Oct. 2003 MAC Review – IR 2 Status 12

Erratic Behavior Similar to Before

9 Oct. 2003 MAC Review – IR 2 Status 13

Three States

9 Oct. 2003 MAC Review – IR 2 Status 14

Measured Power from Cooling Water Temperature riseData from March 30-31, 2003

I (ma) NbunchesI bunch Sum Ib^2LER Current 1850 926 2.00 3696 78%HER Current 990 923 1.07 1062 22%Sum 2840 4758

LER RF V 3.2HER RF V 11.2

Water FlowTC Sensor dT (F) GPM P (W) P/Sum(Ib^2)T_BLWL_O 34.96 1 5122 1.077

T_VTX_O - T_VTX_I 0.7 1.7 174 0.037T_VTX_O 3.08 1.7 767 0.161

T_BLWR_O 37.73 1 5528 1.162T_BLWRO2 39.82 1 5834 1.226

T_V4A_O 2.05T_V3A_O 1.92A side average 1.99 0.569 165 0.035

T_V3B_O 5.2T_V4B_O1 5.43T_V4B_O2 4.17B side average 4.93 0.644 465 0.098

T_Q1LV_O * 10.7 0.4 627 0.132T_B1LV_O * 3.04 4 1782 0.374T_B1RV_O * 5.14 5 3765 0.791T_Q1RV_O * 14.6 0.45 963 0.202

dT (F) SCFM P (W)Air T_V6A_AI 8.57 4.39 12 0.002

T_V3A_AI 6.29T_V3B_AI 16.62T_V6B_AI 8.39 3.81 10 0.002

Flow Rate and Temperature Rise Measures Power

9 Oct. 2003 MAC Review – IR 2 Status 15

Power

+ Bunch Length factor

9 Oct. 2003 MAC Review – IR 2 Status 16

Power / Sum (Ib^2)

9 Oct. 2003 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

9 Oct. 2003 MAC Review – IR 2 Status 18

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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

9 Oct. 2003 MAC Review – IR 2 Status 21

LERO Feedback

9 Oct. 2003 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

9 Oct. 2003 MAC Review – IR 2 Status 23

Tilt Sensor Data

Mark Petree

9 Oct. 2003 MAC Review – IR 2 Status 24

First Look at Angle change with Beam Current Change

Micro-radians LER 1.2 A HER 0.8 A

Q5LPITCH +44 4

Q5L_ROLL +3 <2

Q4RPITCH +12 <5

Q4R_ROLL +9 <2

Q5RPITCH -22 <2

Q5R_ROLL -5 <2

9 Oct. 2003 MAC Review – IR 2 Status 25

Water Level Data

• Note beam dependence on LRAFT (A side) sensors

• Andrei Seryi IR breakout

9 Oct. 2003 MAC Review – IR 2 Status 26

Wire Alignment Data

0.2

mm

ful

l sca

le

Zach. Wolf, Dave Jensen, Kris Dudley, Brenden Dix

9 Oct. 2003 MAC Review – IR 2 Status 27

Tracker Data

Catherine LeCocqRobert Ruland

9 Oct. 2003 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

9 Oct. 2003 MAC Review – IR 2 Status 29

Pressure IncreaseB side pressure lower than A side

9 Oct. 2003 MAC Review – IR 2 Status 30

Q2 water circuit pump out

Release Water Pressure

Pump circuit

9 Oct. 2003 MAC Review – IR 2 Status 31

July Pump Down and Now

1 nTorr

9 Oct. 2003 MAC Review – IR 2 Status 32

Q2 Leak from material flaw

9 Oct. 2003 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– …