1. Undulator System Components Status Dean Walters

2. Undulator System Components Status
Vacuum Components
Chamber
Quad Spool
Bellows
Diagnostics
RFBPM
Beam Finder Wire
Beam Loss Monitor

3. End bi-metal flange welding
Vacuum Chamber
End bi-metal flange welding
From:
E Trakhtenberg
G Weimerslage

4. Graphical Display of Surface finish Data
Vacuum Chamber
Graphical Display of Surface finish Data
The average of all vacuum chambers is mrad in Z′ and mrad in X′, the rms of Z’ is 15.5 mrad and X’ is 36.9 mrad. Selecting the best 33 chambers yields an rms for Z’ of 13.9 mrad and X’ of 34.2 mrad. Extrusions 7, 10, 16, 28 and 35 were sacrificed to verify surface finish in the middle of the extrusions
Should be Avoided
Acceptable
15.5
Very Desirable
From:
E Trakhtenberg
G Weimerslage
36.9

5. Quad Spool
Design
Flexible mini-bellows
Surface finish measurements of the central tube show a roughness of Sq=.18 µm

6. Bellows Module
Initially the supplier had problems with the welding of the SST adapter to the flange. The supplier solved the problem by using the micro-TIG welding process.
Eight units are being assembled and are expected to Ship to SLAC on May 9, 2008
The other (27) units are in the pipe line and are schedule to arrive to SLAC on May 23, 2008

7. Beam Finder Wire Repeatability Testing

8. BFW Repeatability Test Arrangement and Results
Physics Requirements: 80 Micron Horizontal & 30 Micron Vertical (RMS)
“Keyence” Displacement Sensors (Typ.)
Repeatability Test Arrangement

9. RFBPM M1-Tool Works Production
M1 awarded contract for machining bodies and transitions for all 40 sets of parts
First 20 Production BPMs mechanically measured very good

10. Altair Production End Caps
Production End Caps are in spec electrically and mechanically
Problems with polishing resolved
Production ramping up with 10 sets first received 4/22/08
Measurement
LCLS BPM End Caps #1
LCLS BPM End Caps #2
RMS (nm)
Sa (nm)
PV (nm) 1
21.9
17.3
411
45.7
30.6
2066 2
23.5
18.6
659
48.6
32.5
1898 3
23.6
18.9
548
43.0
29.4
1674 4
23.9
18.7
433
47.9
33.2
1880
Average
23.2
18.4
513
46.3
31.4

11. RFBPM Windows QC Results
Since we have been measuring glass thickness
and flatness and visually inspected windows.
We have looked at 93 windows, 20 held aside for
thin glass, 6 not flat, 1with a visual flaw.

12. Parts Stored in Dry Nitrogen Box

13. BPM Window Statistics
Transition and window brazed with Georo braze filler
Sub Assemblies are Vacuum checked before brazed to body
In the last run of windows being brazed to transitions there were 13 of 13 defect free parts made.
In the last run of body brazes, 3 bodies with 5 transition joints each, there were no leaks.

14. Cavity BPM Production Statistics
S/N
Ship
date
Diameter
SPEC mm
+0, -15um
Frequency
Before
tuning
After
Pre-tuning
After final
Braze
Tuning
GHz
+/- 10 MHz
Q loaded
010 mm
GHz
GHz
In-process
011
4/09 mm
GHz
GHz
11.389
GHz
3035
012
4/18 mm
GHz
GHz
11.387
11.382
3308
013 mm
GHz
GHz

15. First Production Unit Shipped to SLAC

16. Waveguide Status and Schedule
First Articles have been received and accepted.
Balance of the order are due 5/16/06
Expect delivery to SLAC on 5/30/08
BPM, waveguide and receiver test fit
So far so good

17. Receiver Production Status and Schedule
First Unit Received 4/11/08
Critical parameters checked meet specification
1st receiver ship date 06/12/08
Production of 13 receivers ship date 07/01/08
Production of 13 receivers ship date 07/22/08
Production of 13 receivers ship date 08/08/08

18. Beam Loss Monitor
The BLM will be used for Two Purposes:
A: Inhibit bunches following an “above-threshold” radiation event.
B: Keep track of the accumulated exposure of the magnets in each undulator.
Purpose A is of highest priority. BLM will be integrated into the Machine Protection System (MPS) and requires only limited dynamic range from the detectors.
Purpose B is also desirable for understanding long-term magnet damage in combination with the undulator exchange program but requires a large dynamic range for the radiation detector (order of 106 ) and much more sophisticated diagnostics hard and software.
Source: HD Nuhn
Source: P Krejcik
Primary function of the BLM is to indicate to the MPS if losses exceed preset thresholds.
MPS processor will rate limit the beam according to which threshold was exceeded and what the current beam rate is.*Beam Current threshold determination?
The thresholds will be empirically determined by inserting a thin obstruction upstream of the undulator.
Simulation of losses and damage in the undulator will proceed in parallel with the present effort.

19. Beam Loss Monitor Beam Line Detector: Detailed and Assembly Drawings:
(engineering review and tolerancing).
Detector Head.
Detector BFW Mounting Bracket.
Undulator Motion Tracking Adapter.

20. Interface Module Enclosure
Prototype design complete.
Prototype board and enclosures fabricated.
Final enclosure design in process (stenciling?)
Bench and beam based testing plan.

21. Interface Module Girder Location

22. Conclusions
Except for the Beam Loss Monitor all other components are in production
Items that have completed production
Vacuum Chamber
Vacuum Chamber Support
Beam Finder Wire Support
BPM Support
Items still in the process of production
BPM cavity - (20% complete) : Final Unit 7/16/08
Beam Finder Wire - (8% complete) : Final Unit 6/3/08
Quad Spool - (19% complete) : Final Unit 6/9/08
Bellows Module - (21% complete) : Final Unit 5/23/08
Long Break Spool and its support : Final Unit 6/18/08