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Bleedthrough T/S progress

1 day 17 hours ago
Log Number: 4505971Logbook(s): Entry Makers: schoeneBody: 

We have checked injector orbits and then checked the bleedthrough again on the xB viewers, and we are still seeing similar amounts of non-colinear bleedthrough. We are currently doing step 2 of the plan (attached log entry), the QE Scan.

schoene

Bleedthrough Investigation - White Board Plan

1 day 18 hours ago
Log Number: 4505958Logbook(s): Entry Makers: ryanmbBody: 

Summary of this morning's bleedthrough discussion.

Currently, it appears that the bleedthrough is coming from the C beam through the A slit. D beam is also going through the A slit. C beam is through the C slit. A few days ago, things appeared mostly colinear in the injector, but that needs confirmation today. Also the other night, adjusting the 3rd pass separator gang phase may have helped, though uncertain. This was performed at 40 uA.

ryanmb

FSD Masking Tool: Successful System UN-Masking for: BeamLossMonitor

1 day 18 hours ago
Log Number: 4505957Logbook(s): Tags: Body: System UN-Masking for: BeamLossMonitor
User: janak
Areas: All

BeamLossMonitor Devices:
ILM0I07
ILM0L01A
ILM0L01B
ILM0L02
ILM2D00A
ILM2D00B
ILM0L04A
ILM0L04B
ILM0L05
ILM0L06A
ILM0L08
ILM0R01
ILM4D00
ILM0R03
ILM0R04
ILM0R06
ILM0R08
ILM0R09
ILM1L01
ILM1L02
ILM6R08
ILM3S00
ILM7S00
ILM9S00
ILM5S10
ILM5E03
ILM7S01
ILM9A01
ILM3E02
ILM5A01
ILM1A04
ILM1A06
ILM1A09
ILM5A10
ILM1A16
ILM1A19
ILM3R10
ILM9R07
ILM1R09
ILM2L03
ILM5R10
ILM5R05
ILM2L01
ILM2T09
ILM8T
janak

Comparing B Beam vs C Laser Bleedthrough from A and C Slits

1 day 19 hours ago
Log Number: 4505946Logbook(s): Entry Makers: deirBody: 

It's interesting. We can see two distinct beamspots on each viewer. The left spot on 2C21 is the bleedthrough from the A slit. The right spot on 2C21

For reference, Figures 3-5 show the bleedthrough from C laser through the B slit. This is very close in profile and position when compared to just sending B beam, shown in Figs 6 & 7.

Tweaked third pass separation a bit, required a 2 degree change to gang phase.

deir

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