Page History

Table of Contents

Status

Partial replacement of old, lossy cables to RF cables
- Cable routing currently limited by available conduit space from the tunnels
Current cable assignment documentation is incorrect and does not match assignments or installation status
Initial waveforms taken with the Digital Analyzer were incorrectly saved and need to be re-taken
De-embedding of RF power levels measured outside of the tunnel yields un-realistic values:
- This will be further investigated at the next shutdown which will enable tunnel access
- Yellow tags attached to tunnel power detectors do not match loss values in official drawings
- Documented losses > 10 dB off expected values for worst offenders

	Cable	Status
AS1 Load FWD	103	Not installed
S Band Buncher FWD	100	Not installed
AS1 FWD	102
AS1 REV	104	**Mislabelled in W0440646 as 101
AS2 Load FWD	107
S Band Buncher REV	n/a	**Mislabelled in W0440646 as 104; no cable installed
AS2 FWD	106
AS2 REV	105	Cable damage suspected

Data

All data stored here
Reference cable naming hereCable Installation document here W0440646 - PLAN - SSD2025 - Cable removal and installation for LINAC LLRF System
Reference drawing
- LINAC tunnel 23W2495

LOTOs

310A-CB28 BA Panel LI1817

310A-CB33 BA Panel LI2117

Measurement Equipment

Equipment

MPNSerial

		Calibration and Settings
Peak RF Power Meter

High Speed Scope

LINAC RF MASTER as the trigger
- Is this accessible?

N type female-female adapterN type cable3 dB splitter(N type splitter set)

Relevant Interlocks

Gigatronics

80350A/ 8652B

SN:1830822/8652601

Image AddedImage Added

Pulsed, RF triggered

Validated with R&S SMA100B pulsed RF output

Digital Serial Analyzer

Tektronix

DSA71254B

SN:8110800

Image Added

Relevant Interlocks

KLY FWD and REV signals are connected to interlocks internal to the modulators

...

Setup Notes

Signal

Assigned

RF Cable

Currently connectedCable/ chassis used for 2025 measurementsAdapter Used for RF PowerCoupling +LPF where applicable (dBm)Expected power (dBm)Peak RF PowerTriggerWaveformActions Required

from Tunnel	Tunnel Pictures
AS1 Load FWD	103

VIDEO DETECTOR #7 PG2

(

Coupler + LPF

not installed)

102 - LI1838

OR 105 AS2 IN REV (closer in ALS, farther outside tunnel)

~2 m, cable extension

84.19

Image Added

VIDEO DETECTOR #7

< 30LI1838


S Band Buncher FWD	100

VIDEO DETECTOR #4 PG2

(

Coupler + LPF

not installed)

102 -LI1838(very close; same cable?)

76.8

< 30

Image Added VIDEO DETECTOR #4
AS1 FWD	102

Coupler + LPF

102 -LI1838

N-type splitter set

83.99

Image Added

VIDEO DETECTOR #6

< 30


AS1 REV	101 is listed in the cable installation notes, but cable 104 is actually installed. Cable 101 does not appear to exist	Image Added VIDEO DETECTOR #5

PG2

(Coupler + LPF)

102 -LI1838(very close; same cable?)71.44< 30KLY1 FWD108

MOD1 CP

outside tunnel102KLY1 REV109

MOD1 CP

outside tunnel

82

AS2 Load FWD

107

Coupler + LPF

107- LI212083.82< 30LI2120

Image Added VIDEO DETECTOR #10
S Band Buncher REV	According to the cable installation notes, 104

Coupler + LPF104 -LI212060.8

. No cable actually installed

Image Added

VIDEO DETECTOR #3

< 30


AS2 FWD	106

Coupler + LPF

106-LI212084.05< 30

Image Added

VIDEO DETECTOR #9

AS2 REV

105**

This cable is suspected to be damaged due to out of nominal losses at 500 MHz (27 dB) and 3 GHz (23 dB) and needs to be replaced

Image Added

VIDEO DETECTOR #8

PG2


KLY1 FWD	108	MOD1 CP
KLY1 REV	109	MOD1 CP

106-LI2120(very close; same cable?)71.15< 30


Kly2 FWD	112	MOD2 CP

outside tunnel102


Kly2 REV	113	MOD2 CP

outside tunnel82~~MOD1 HSD110~~

~~MOD1 HSD~~

~~outside tunnelMOD1 HSD111~~

~~MOD1 HSD~~

~~outside tunnelMOD2 HSD114~~

~~MOD2 HSD~~

~~outside tunnelMOD2 HSD115MOD2 HSD~~

~~outside tunnel~~

125 MHZ CAV

not yet assigned

?


500 MHZ CAV	not yet assigned

?

?
125 MHZ DRIVER FWD	not yet assigned	?

outside tunnel

125 MHZ CAV FWD

not yet assigned

?

outside tunnel


125 MHZ CAV REV	not yet assigned	?

outside tunnel

500 MHZ DRIVER FWD

not yet assigned

?

outside tunnel


500 MHZ CAV FWD	not yet assigned	?

outside tunnel


500 MHZ CAV REV	not yet assigned	?

outside tunnel

Procedure

...

AS1 FWD
AS2 Load FWD
S Band Buncher REV
AS2 FWD

...

AS1 Load FWD
S Band Buncher FWD
AS1 REV
AS2 REV

RF Power Level Calculations

Notes: These calculated de-embedded values are not consistently physically realistic; do not use these for any analysis or purpose.
Noted here as the investigation continues to determine the sources of errors in drawings and documentation.

Total Peak Power Summary
	Peak Power Measurement at Rack	Peak Power in Tunnel, De-embedded
	dBm	dBm	MW
AS1 Load FWD	6.8	109.9	97.3
S Band Buncher FWD	10.4	103.1	20.6
AS1 FWD	8.4	111.6	145.9
AS1 REV	-16.6	73.0	0.020
AS2 Load FWD	4.9	110.8	119.9
S Band Buncher REV	-14.9	61.9	0.002
AS2 FWD	10.4	113.5	225.4
AS2 REV	4.2	100.8	12.1

Losses
	RF Tunnel to Rack Cable Loss	Coupler cf	Installed Atten	Internal Cable Loss+Atten (per Tag)	Tag Total	Drawing Loss + Coupling Total	Total Loss + cf in Peak power Measurement used for de-embedding
	dB	dB	dB	dB	dB	dB	dB
AS1 Load FWD	16.83	53.26	33	32.99	86.25	83.82	103.08
S Band Buncher FWD	16.13	50.34	26	26.26	76.6	76.8	92.73
AS1 FWD	17	53.26	33	32.98	86.24	84.19	103.24
AS1 REV	16.13	53.26	20	20.24	73.5	71.44	89.63
AS2 Load FWD	19.87	53.2	33	32.82	86.02	83.82	105.89
S Band Buncher REV	16.13	50.34	10	10.26	60.6	60.8	76.73
AS2 FWD	16.83	53.2	33	33.1	86.3	84.05	103.13
AS2 REV	23.15	53.26	20	20.2	73.46	73.46	96.61

...

Page tree

Versions Compared

Old Version 2

New Version Current

Key

Status

Data

LOTOs

Measurement Equipment

Relevant Interlocks

Relevant Interlocks

Setup Notes

Procedure

RF Power Level Calculations