1. 2K Cold Box FDR Introduction
Dana Arenius
LCLS-II 2 K Cold Box FDR
March 9, 2017

2. Review Purpose and Charge Agenda Lessons Learned/Previous Issues
Review Outline
Scope
Review Purpose and Charge
Agenda
Lessons Learned/Previous Issues
LCLS-II 2 K CBX FDR, Mar 9, 2017

3. Scope of Work
LCLS-II 2 K CBX FDR, Mar 9, 2017

4. Cryoplant First Light & Normal Beam Operations
2 Cryomodule Strings
U-Tube Connections
14 MV/m Gradient
2.0≤ Qo ≤3.0
Compressor System
4.5 K
Coldbox
LHe
Dewar
2.0 K
Normal Beam Operations
2 Cryoplants
2 Cryomodule Strings
U-Tube Connections Removed
Gradient - 16 MV/m
2.0≤ Qo ≤3.0
Compressor System
He Gas Tanks
4.5 K
Coldbox
LHe
Dewar LN 2
Dewar
2.0 K
Coldbox
U-TUBE JUMPER CONNECTIONS - IB IB
Upstream Distribution Box
Downstream Distribution Box
Downstream
Distribution
Upstream String
Box
Downstream String LH BC 1 L L 1 L 2 L 3 FC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 IB
Cryogenic
Cryogenic Transfer 3 . 9
GHz Cryomodule 1 . 3
GHz Cryomodule
End /
Feed Cap
Vacuum
Barrier
Bypass
Line
Cryoplant
Gas Header
Interface Box
LCLS-II 2 K CBX FDR, Mar 9, 2017

5. Cryoplant Layout Overview
LN2 storage
CP1 4.5K Cold Box
GHe storage
CP1 Oil Removal
CP2 4.5K Cold Box
CP2 Oil Removal
CP2 Compressors
CP1 Compressors
Oil
processor
2K CBX
Guard Vacuum
CDS Interface Boxes
LHe
Dewar
LHe
Dewar
Instrument Air
Motor Control
Center 5
LCLS-II 2 K CBX FDR, Mar 9, 2017

6. 2K Cold Box Work Scope
Provide engineered design documentation for build-to- print assembly of two cold boxes, six stages of cryogenic centrifugal cold compressor train each inclusive of interconnecting piping, controls, valves, and connection bayonets within a single vacuum enclosure.
Cold compressor casings and bayonets will be provided to the assembly vendor for installation
Cold compressors, their controls and power systems are not part of this review, purchased and reviewed as a separate contract
LCLS-II 2 K CBX FDR, Mar 9, 2017

7. Review Purpose and Charge
LCLS-II 2 K CBX FDR, Mar 9, 2017

8. Review Purpose and Charge
LCLS-II 2 K CBX FDR, Mar 9, 2017

9. Review Purpose and Charge (continued)
LCLS-II 2 K CBX FDR, Mar 9, 2017

10. Review Purpose and Charge (continued)
LCLS-II 2 K CBX FDR, Mar 9, 2017

11. Lessons Learned
Many of the aspects of the early FRIB 2K cold box design features for LCLSII
The insertion of a single cold compressor stage to develop a low and high operational flow range for the cold compressor train.
Seismic design criteria from the warm helium compressor system, 4.5K cold box, etc. as it was applied to the 2K cold box assembly
LCLS-II 2 K CBX FDR, Mar 9, 2017

12. 2K Cold Box FDR Agenda
LCLS-II 2 K CBX FDR, Mar 9, 2017

13. FDR Agenda, https://www.jlab.org/indico/event/204/
LCLS-II 2 K CBX FDR, Mar 9, 2017

14. Agenda (continued)
LCLS-II 2 K CBX FDR, Mar 9, 2017

15. Preliminary Design Review Recommendations Status
LCLS-II 2 K CBX FDR, Mar 9, 2017

16. Recommendations
The structural analysis needs to be updated for LCLS-II by FDR.
RESPONSE: The structural analysis has been completed based on the LCLS-II design. They are shown in the presentation by Shirly Yang.

17. Recommendations (continued)
Large virtual leak exists between flex ID and process piping. Need to address this.
RESPONSE:
Twelve- 1/8” holes are provided on the process pipe in the flow straightener section to facilitate vacuum pumping of the annular space between the flow straightener and the flexible hose

18. Recommendations (continued)
3. Develop function requirements document for 2K cold box.
This document has been developed and is pending approval.
4. The pump down path being provided by the vendor is a different approach than Jlab, SNS, and FRIB are employing. Consider capturing this in a risk assessment and developing a back up plan in case commissioning proves difficult.
The vendor proposed a pump down path. JLab will also provide a backup pump down plan based on CHL-II commissioning/operation experiences.

19. Recommendations (continued)
5. Consider the use of a closed loop water cooling for the turbine, cold compressors and diffusion pump.
There is a closed water cooling loop for turbines, cold compressors and diffusion pumps in each cryoplant.
6. Ensure that the SLAC Electrical Equipment Inspection Program accepts the use of European electrical codes and standards.
All of the electrical equipment will be inspected by SLAC electrical engineers before installation.
7. Perform a heat leak analysis on the 2K cold box to ensure that the inlet conditions to the 4.5K cold box can be met.
The heat leak analysis was performed and included in “LCLSII-4.8-EN-0804 LCLS-II 2K Cold Box Process Analysis ”

20. Recommendations (continued)
8. Submit the seismic analysis as early as possible to ensure that the required FDR schedule can be met.
The seismic analysis of 2 K cold box anchorage was completed and the reports have been submitted to SLAC for review.
9. Submit the sub-atmospheric relief valve design to the SLAC pressure system manager for approval.
The relief valve design has been completed and approved by JLab pressure system committee, shown in the document “79222-A0001 2K Cold Box Relief Valves”. The report is to be submitted for SLAC pressure system review with the 2 K cold box FDR package.

21. Thank You For Your Kind Attention May I Answer Your Questions
LCLS-II 2 K CBX FDR, Mar 9, 2017