Log entry time 23:58:18 on November 09, 2009

Entry number 298661

This entry is a followup to: 298181

Followups:

• 298683 11/10/09 00:38 Jin Huang New beam position for production tonight

Copy of last log

Nov 07 18:10 5uA Beam on carbon hole target

• run 25317/4846
• L/R HRS T1/kHz : 0.98/0.37
• Hole centered

Nov 07 18:17 5uA Beam on dummy with hole, VDC HV ramping up

• run  : 25318/4847; 25319 with VDC ON
• L/R HRS T1/kHz : 3.2/1.0
• Hole centered on downstream foil.

Nov 07 18:17 2.1uA Beam on LD2 target

• run  : 25320/4848
• L/R HRS T1/kHz : 8.3/3.7

Nov 07 18:17 2uA Beam on LD2 target. run  : 25321-25322/4849-4850; VDC ON

• 2.10uA, BPM A = B = (-3.0, 2.0)mm -> L/R HRS T1/kHz : 8.3/3.7
• 2.10uA, BPM A = B = (-3.0, 0.2)mm -> L/R HRS T1/kHz : 8.2/3.7
• 2.07uA, BPM A = B = (-3.0, -2.0)mm -> L/R HRS T1/kHz : 8.0/3.7
• 2.08uA, BPM A = B = (-3.0, -3.0)mm -> L/R HRS T1/kHz : 7.9/3.6
• 2.10uA, BPM A = B = (-3.0, -4.0)mm -> L/R HRS T1/kHz : 7.9/3.7
• 2.12uA, BPM A = B = (-3.0, -4.3)mm -> L/R HRS T1/kHz : 8.0/3.7
• 2.12uA, BPM A = B = (-3.0, -4.3)mm -> L/R HRS T1/kHz : 8.0/3.7
• 2.12uA, BPM A = B = (-3.0, -5.0)mm -> L/R HRS T1/kHz : ???/4.2  -> Start run 25323/4851.
• LHRS Q1 Dipole; RHRS Q1/Q3 tripped. Test suspended.
• Bottom of cell found @ BPM A = B = (-3.0, -5.0)mm

New Scans

LHRS is down for the moment. Therefore, only RHRS is used in this steps.

22:16 5uA Beam on carbon hole target

• run 4894
• R-HRS T1/kHz : 0.17
• Hole mostly centered

22:25 2uA Beam on LD2 target. run  : 4895-4897; VDC ON

• 2.00uA, BPM A = B = (-3.0, 2.0)mm -> R-HRS T1/kHz : 1.71 <- reference spot++ run 4895
• 2.00uA, BPM A = B = (-3.0, 4.6)mm -> R-HRS T1/kHz : 1.74 <- continues taking data from run 4896
• 2.00uA, BPM A = B = (-3.0, 6.9)mm -> R-HRS T1/kHz : 1.78 <- spot++ run 4897: Beam scratching seen at one coner

TOP found around BPM A = B = (-3, 7)mm

LD2 Cell Center is around Y ~= +1mm; Safe range (<10% of scratching) is -5 ~ +7 mm

23:01 2uA Beam on LD2 target. run  : 4898-4900; VDC ON

• 2.08uA, BPM A = B = (-3.0, 1.0)mm -> R-HRS T1/kHz : 1.80 <- continues taking data from run 4898
• 2.09uA, BPM A = B = (-0.7, 1.0)mm -> R-HRS T1/kHz : 1.82
• 2.09uA, BPM A = B = (0.9, 1.0)mm -> R-HRS T1/kHz : 1.82
• 2.10uA, BPM A = B = (2.9, 1.0)mm -> R-HRS T1/kHz : 1.88 <- spot++ run 4899:
• 2.08uA, BPM A = B = (3.4, 1.0)mm -> R-HRS T1/kHz : 1.94 <- spot++ run 4900: Beam scratching seen at one coner

23:26 2uA Beam on LD2 target. run  : 4901-4904; VDC ON

• 2.08uA, BPM A = B = (-3.0, 1.0)mm -> R-HRS T1/kHz : 1.80 <- continues taking data from run 4901
• 2.07uA, BPM A = (-4.7, 1.0)mm; BPM B = (-7.0, 1.0)mm -> R-HRS T1/kHz : 1.92 <- spot++ run 4902.Beam scratching seen at one coner
• 2.07uA, BPM A = B = (-4.7, 1.0)mm -> R-HRS T1/kHz : 1.87 <- spot++ run 4903.  Beam scratching seen at one coner
• 2.08uA, BPM A = B = (-4.0, 1.0)mm -> R-HRS T1/kHz : 1.80 <- spot++ run 4904. Beam Clear

LD2 Cell Center is around X ~= -0.5mm; Safe range (<10% of scratching) is -4.7 ~ +3.4 mm

23:45 2uA Beam on LD2 target. run 4906 @ BPM A = B = (0.0, 0.0)mm. Spot++ clear

We should be safe to run production on BPM A = B = ( 0 , 0 ) mm