Peggs Project Status 190509 · 3:40 Installation status and schedule Karl Smolenski 4:10 Impact of CBETA on EIC: hadron cooling Dejan Trbojevic 4:40 Executive session 5:30 Discussion

[email protected] Advisory Committee 190509 !1

Project StatusSteve Peggs, BNL

mailto:[email protected]?subject=


Introduction / reprise

Charge items 1. Prior recommendations 2. Optics validation 3. Single pass commissioning 4. Multi-pass commissioning 5. Goal prioritization 6. Strategies for future support

Summary & conclusions

Table of contents



Agenda mappingTime Title Presenter

7:45 Van Pickup at Hotel Ithaca

8:00 Breakfast snacks for review panel8:30 Executive session

INTRODUCTION

9:00 Welcome Julia Thom-Levy9:10 Project status & overview Steve Peggs9:40 Scientific potential and future options Georg Hoffstaetter

10:10 Commissioning Plan Adam Bartnik10:40 Coffee break & Tour of CBETA

HARDWARE

11:10 Equipment Protection System Nilanjan Banerjee11:30 RF System: status and performance Peter Quigley11:50 Beam Position Monitor performance Rob Michnoff12:10 Instrumentation: portfolio & future John Dobbins12:30 Executive session and lunch for committee1:10 Control system and CBETA-V Kirsten Deitrick

BEAM DYNAMICS

1:30 Commissioning physics: goals and opportunities Scott Berg2:00 Commissioning results and status (including FAT) Colwyn Gulliford2:30 Coherent synchrotron radiation simulations Wei Yuan (William) Lou3:00 Coffee break

THE FUTURE

3:10 4-pass field-map simulations Francois Meot3:40 Installation status and schedule Karl Smolenski 4:10 Impact of CBETA on EIC: hadron cooling Dejan Trbojevic4:40 Executive session5:30 Discussion with CBETA / homework6:00 Adjourn7:00 Dinner with committee and speakers Agava (381 Pine Tree Rd, Ithaca)

Time Title Presenter

7:45 Van Pickup at Hotel Ithaca

8:00 Breakfast snacks for review panel8:30 Executive session9:00 Homework responses / open discussion

10:00 Executive session12:00 Lunch for committee1:00 Close out with CBETA staff Mike Harrison2:00 Adjourn

CBETA Advisory Committee Meeting

374 Wilson Lab, Cornell University

May 9-10, 2019

v5.3

Prior recomms.

Optics validation

Single/multi-pass

Goal priorities

Future support



Introduction / reprise



New York State Energy Research and Development

Laboratory Director: Doon Gibbs

Project Office Project Director: Steve Peggs (BNL),

Project Manager: Rob Michnoff (BNL), Deputy PM: Karl Smolenski (CU) Principal Investigators: Georg Hoffstaetter (CU), Dejan Trbojevic (BNL)

Resource Manager: Stephanie LaMontagne (BNL) Financial Services: Katie Jacoby (CU), Ann Lamberti (BNL), Cris Manalo (BNL)

Baseline Control Board Chair: Ivan Bazarov (CU), Georg Hoffstaetter (CU),

Rob Michnoff (BNL), Steve Peggs (BNL), Vadim Ptitsyn (BNL), Karl Smolenski (CU), Dejan Trbojevic (BNL)

Oversight Board Chair: Berndt Mueller (BNL), Emmanuel Giannelis (CU),

Ritchie Patterson (CU), Thomas Roser (BNL)

Advisory Committee Chair: Mike Harrison.

Sergey Belomestnykh, Steve Benson, Oliver Bruning, Wolfram Fischer,

Shinji Machida, Dave Rubin

Work Breakdown Structure (Level 2) 1.1 Project management Rob Michnoff (BNL) 1.2 Accelerator physics Georg Hoffstaetter (CU) 1.3 DC gun/injector Colwyn Gulliford(CU) 1.4 RF systems Peter Quigley (CU) 1.5 Halbach magnets & girders Joe Tuozzolo (BNL) 1.6 Splitters David Burke (CU) 1.7 Power supplies Karl Smolenski (CU) 1.8 Controls John Dobbins (CU) 1.9 Instrumentation John Dobbins (CU) 1.10 Vacuum system & beam stop Yulin Li (CU) 1.11 System integration Rich Gallagher (CU) 1.12 Beam commissioning Adam Bartnik (CU) 1.13 Safety Dwight Widger (CU)



Key Performance Parameters

4-pass capability fully installed.

Design parameters are stretch goals, with challenges /opportunities for post-NYSERDA funding & collaboration

beam, through the use of a multi-pass ERL with permanent magnet recirculation arcs. While simpler ERLs havebeen constructed and operated before, this new innovative ERL design needs to be tested first as a prototype.

BNL will serve as NYSERDA’s Contractor, but the majority of the work will be conducted at Cornell University.Cornell University has sufficient high bay area and associated infrastructure to enable the prototype to becompleted with the additional construction and installation of a permanent magnet recirculation arc. Theprototype ERL will be installed in a repurposed extracted-beam hall in the Wilson laboratory at Cornell. Thisfacility provides the basic infrastructure required to test the multi-pass (4-turn) ERL, including utilityconnections, support infrastructure, shielding and controls. Both BNL and Cornell will provide access totheir test facilities to NYSERDA representatives.

BNL will manage, direct and coordinate the entire project with Cornell University working as a sub-contractor toBNL. BNL will provide a copy of the subcontract with Cornell to NYSERDA,

The overall project includes the design, procurement, installation, commissioning and testing of scientificequipment and all of the associated labor to manage and operate the prototype facility.

A set of key performance parameters (KPPs) have been defined for the prototype project as a way to monitorproject progress. The project entails significant technical risk and these KPPs will be reviewed frequentlythroughout the project to gauge performance. The KPPs are as follows (Table 1):

Table 1: Key Performance Parameters (KPPs) and design parametersfor C-Beta.

Parameter Unit KPP Design

Electron beam energy MeV 150

Electron bunch charge pC 123

Gun current mA 1 40

Bunch repetition rate (gun) MHz 325

RFfrequency MHz 1300 1300

Injector energy MeV 6

RF operation mode CW

Number of ERL turns 1 4

Energy aperture of arc 2 4

Two critical “go/no go” technical performance milestones have been incorporated into the project workscope to mitigate overall risk and allow for project termination, if necessary, before all funding has beencommitted.

Total project duration is 42 months and includes the following (Table 2) technical milestones:

3



Technical Milestones

1 to 7 on schedule or early, 8 was 13 days late.

9, 10 & 11 are beam commissioning goals.

Some installation work continues, without hampering Task 9.

# Technical milestone Contract ActualNYSERDA funding start date 31-Oct-16

1 Engineering design documentation complete 31-Jan-17 31-Jan-172 Prototype girder assembled 30-Apr-17 30-Apr-173 Magnet production approved 30-Jun-17 23-Jun-174 Beam through Main Linac Cryomodule 31-Aug-17 16-Jun-175 First production hybrid magnet tested 31-Dec-17 21-Dec-176 Fractional Arc Test: beam through MLC & girder 30-Apr-18 20-Apr-187 Girder production run complete 30-Nov-18 21-Nov-188 Final assembly & pre-beam commissioning complete 28-Feb-19 13-Mar-199 Single pass beam energy scan 30-Jun-1910 Single pass beam with energy recovery 31-Oct-1911 Four pass beam with energy recovery (low current) 31-Dec-1912 Project complete 30-Apr-20



Equipment Protection System was developed — continues. - A review of Phase 1 was held on March 1.

An amended Radiation Producing Equipment permit was approved by CLASSE and Cornell in November.

Site visit by NYSERDA to Cornell on March 12. - Many ideas were brainstormed. - Eg the joint BNL-Cornell optimization of a broader

public relations event, when there has been significant success with CBETA beam.

Fractional Arc Test beam commissioning analysis was refined and recorded as Tech Note 39.

Since the last AC meeting



April 13, 2019



Near-term calendarTechnicalMilestone

2019April 22 CBETA Oversight BoardMay 9-10 Advisory Committee meeting: technical reviewJune 30 9 "Single pass beam energy scan"July 15 L0E building shutdown until Aug 15July 17 Collaboration meetingOct 31 10 "Single pass beam with energy recovery"Dec 31 11 "Four pass beam with energy recovery (low current)"

2020April 30 12 "Project complete"

Aim to achieve milestone 10 before the shutdown (July15 - Aug 15) in which the 2 splitters will be reconfigured.



Charge 1 Prior recommendations

“Did the project respond appropriately to the recommendations of the last Advisory Committee meeting in October 2018?”



There were 4 recommendations: https://www.classe.cornell.edu/CBETA_PM/190509_review_AC/Recommendations.pdf

1. Fractional Arc Test: “The Advisory Committee would therefore suggest a more detailed analysis with the goal of achieving not only qualitative, but also quantitative agreement between the model and measured data and encourages the CBETA team to develop the required tools for such a detailed analysis in time for the full machine commissioning in 2019.”

Response: A detailed analysis has been refined, and is presented in Technical Note 39. Copious new data being acquired during Task 9. (See presentation by Gulliford.)

Recommendation response - 1



2. Equipment Protection System: “A review of the machine protection system is suggested.” ... “The Committee suggests that the Project have an in-depth review of the Machine Protection System including the commissioning plan and calibration of beam loss monitors.” ... “Enhanced analysis of the sensitivity of the magnets to radiation damage and the ability of the loss monitors to protect from such levels would seem prudent.”

Response: A review of the EPS (Phase 1) was held on March 1. The EPS is a vital component in commissioning activities. (See presentation by Banerjee, & tech notes 36, 38 & 40.)




3. Finalizing optics: “The advisory committee suggests finalizing the dump line lattice and optics as soon as possible and preparing tools and procedures for measuring the energy acceptance and aperture of the line in the final configuration in CBETA.”

Response: The optics have been finalized. Tools and procedures for measuring energy acceptance & aperture have been developed, and continue in development.




4. Commissioning configuration evolution: “It was not clear from the presentations at what stage the operation team would switch from the baseline, 4-pass energy recovery configuration to the back-up scenarios with 2 or 3 passes. The committee suggests defining and spelling out the criteria and deadline[s] for taking these decisions well before the commissioning starts.”

Response: The re-configuration plan was developed by a consensus of the senior management team and the control room principals. Back-up contingency scenarios are available. (See presentations by Hoffstaetter, Bartnik & Berg.)




Charge 2 Optics validation

“Does the final analysis of the Fractional Arc Test results quantitatively validate the predicted optics?”



CBETA Tech Note 39 “Beam commissioning results …” refined the results previously reported in Tech Note 32 “The CBETA Fractional Arc Test”.

- Recently submitted to PRAB …

(See presentation by Gulliford.)



40 45 50 55 60Energy (MeV)

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

νx,

y

νxνytheory

40 45 50 55 60Energy (MeV)

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

νx,

y

νxνytheory

UNSCALED energy SCALED energy

The optimum scale factor of 1.018 suggests an energy calibration error of 1.8%.

Tunes versus energy

Halbach cell tunes



Recent measurements improved this old “good” agreement between space-charge dominated 6 MeV simulations & measurements.

“Beam commissioning results …”



6 MeV beam halo (April)

Injector halo (log-linear plot) over a dynamic range of almost 4 orders of magnitude.

(S. Brooks)



Most recently … (May 7)Beam on all BPMs, FFA dipole correctors off !

Raw horz. BPM measurements vs online model.

H difference orbit (blue) vs model.

(See Gulliford presentation.)



Charge 3 Single pass commissioning

“Is the project likely to meet the goals of Milestones 9 and 10 by June 30 and October 31, respectively?”



Milestone deliverables

9a: Pass beam through MLC and around the arc once … 9b: Test the ability of the arc magnets to pass a broad range of beam energies … 9c: Perform energy scan by adjusting the accelerating voltage of the MLC & activating the beam diagnostic systems. 10a: Pass the beam through the MLC [twice] & decelerate … 10b: Measure the efficiency of the energy recovery … at low currents. 10c: Perform ... experiments on energy recovery variation with beam current and with other accelerator parameters.

T1 7 Complete girder production run 8 Final assembly & pre-beam comm.Running

Temp [K]

T1 9 One pass beam energy scan 10 Single pass with ER 11 Four pass beam with ER 12 Complete the projectRunning

Temp [K]

Pre-beam Beam Cold Warm

19 26June JulyMay August September October November December January February March April

15 22 29 5 129 16 23 1 85 12 19 26 21 8 15 22 2927 3 10 17 2422 29 6 13 2018 25 1 8 1514 21 28 4 11

2018 2019

2019 2020

14 21 28March April

31 7November December January February

24 3 10 17 24June July August September October

20 27 3 10 1716 23 30 6 1311 18 25 2 97 14 21 28 4May

20 27 3 10 17 2 9 1629 5 12 19 26

9 16 23 30 75 12 19 26 2

24 1 8 15 226 13 23 30

SinglePass

4PassSinglePassER 2PassFourPassER FurtherCommissioning



Commissioning traffic lightsTask Status Risk Description DateNYSERDA Milestone 9 "Single pass beam energy scan" June 30Gun Ready for 300 kV operations Mar 15Injection CryoModule Ready for operations Mar 15Injection line magnets & diagnostics Ready for operations April 1Main Linac Cryomodule (MLC) Ready for operations April 8Injection line optics Match optics with beam measurements April 15Beam into dump line 6 MeV April 22Beam through MLC 42 MeV April 22Beam through splitter beamline S1 42 MeV April 29Beam through FFA return arc Milestone deliverable 9a May 15Energy scan complete Milestone deliverables 9b & 9c May 30

NYSERDA Milestone 10 "Single pass beam with energy recovery" Oct 31Beam through splitter beamline R1 June 7Beam into dump Decelerate 2nd MLC pass. Deliverable 10a. June 21Optimize energy recovery Deliverables 10b & 10c June 30

Status Risk to milestone completion on scheduleCompleted NoneIn progress Low to moderateNot started High



Milestone 9. The “traffic lights” (previous slide) include a nominal 30 day contingency, from May 30 to June 30.

- Some of that contingency has been lost, but June 30 is still reasonable.

Milestone 10. Moving from “single pass energy scan” to “single pass ER” should be smooth.

- Continue beam through R1, MLC & into the dump - Nominal date for milestone 10 is October 30 … - For any reasonable chance of meeting Milestone 11,

we need to achieve it before the July 15 shutdown.

Milestones 9 & 10



Optimizing human resources in the control room

Roles & Responsibilities (see wiki on AC home page):

• Principle Investigators “High-level scientific guidance”

• Scientific co-ordinator “Lays out the scientific plan … at a high level, keeping track of weekly and daily goals.”

• Run co-ordinator interfaces with CESR, schedule, etc.

• Lead Operator: One must be present to run beam. - Currently 3 are qualified, often on shift together. - Need to train 3 (?) more, to lead ~6 independent shifts.

• Support Operator: Provides operational support.

Control room organization



Individuals need extensive stays in Ithaca to be effective in the control room.

- 6 or 8 week training period

C-AD could commit to an enhanced involvement.

No RHIC running from July 15 to Dec 15.

Consult closely with Beam Commissioning L2 Bartnik.

BNL commitment could include graduate students - if mentors are available, - if follow-on funding is real.

BNL control room commitments



Charge 4 Multi-pass commissioning

“Is the strategy for moving from one-pass to multi-pass commissioning well thought out?

Does the plan have sufficient flexibility to be able to respond to risks, should they occur?

What are the leading risks?



The Senior Management Team and the control room principals have achieved a consensus plan:

1. July 15 summer shutdown: Begin to re-configure the splitters for 4-pass Energy Recovery - Final commitment at a July 8 focus-group meeting

2. No intermediate re-configuration before July 15

3. No attempt at 1 mA operation before July 15 - Although we will carefully increase the current

towards 1 mA, within safe limits:

(See presentations by Hoffstaetter, Bartnik & Berg.)

Consensus

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BNL & Cornell continue with the original 17/8 M$ split.

The construction & installation hump is (almost) over.

Cornell’s monthly burn rate will drop significantly as beam operations take over, to 250 k$ or less (?) per month.

Cost to completion reality feeds into the planning - funds available will guide length, intensity, and

staffing levels. - we will soon have real operations burn-rate numbers

Operations burn rate



1. Technical challenge - Even 2-pass ER will be a world-class success - The complexity increases significantly with pass number

2. Staff attrition - Post-construction availability of some Cornell staff is

reduced - Others are being re-assigned inside CLASSE

3. Financial: operations burn-rate - We anxiously await real data - In the worst case it will be difficult to run through the end

of April 2020.

Risks



Charge 5 Goal prioritization

“Are the relative prioritizations of achieving the multiple technical goals (total current, single bunch charge, recovery efficiency, et cetera) correct?”



We focus on the milestone deliverables & on the KPPs.

Beyond that, and beyond the issues already mentioned, it is difficult to address this crucial charge item by pointing to other issues and presentations.

Sometimes it is difficult to “see the woods for the trees”.

- We look forward to hearing the comments and recommendations of the Advisory Committee.



Charge 6 Strategies for future support

“Have the PIs identified promising strategies for obtaining financial support for continued operation and exploitation of the CBETA facility after the end of NY State funding for construction and commissioning?”



Primary goal: Achieve NYSERDA milestones & KPPs with NYSERDA funding.

Secondary goal: Use NYSERDA & any interim funding to stretch out CBETA running to April 2020.

DOE-NP are the most likely support of later funding.

NSF should not be ignored, but large funding is unlikely.

The 2 PI’s take the lead.

Strategies for future support



Both U.S. & Japanese sides requested 110 k$ (1 year).

April 25: U.S. side is awarded 10 k$, Japan ~55 k$.

Japanese comments:

“This project is to advance the study on the Energy Recovery Linac (ERL) by the joint research of the compact ERL at KEK & CBETA at Cornell.”

“The research target is the beam commissioning at a high current with the detailed studies on the beam halo and beam diagnostics.”

“The RPC has some question that the project might not be the one in the HEP field, but recognizes the importance.”

“The RPC … urges to apply for other funding sources.”

DOE HEP U.S.-Japan 2019



U.S. comments:

“The proposal aims at strengthening the collaboration on ERLs between the U.S. and Japan by participating in beam commissioning of CBETA and cERL to understand beam halo and work on beam diagnostics.”

“While the proposal is well-conceived and its results could be useful, there is no urgency for this research at this time, and so even excellent results would have less impact and influence on the overall HEP accelerator landscape.”

U.S.-Japan - 2



Summary & conclusions



1. Prior recommendations: Did the project respond appropriately to the recommendations of the last Advisory Committee meeting in October 2018? Yes.

2. Optics validation: Does the final analysis of the Fractional Arc Test results quantitatively validate the predicted optics? Yes, with small caveats. (See presentation by Gulliford.)

3. Single pass commissioning: Is the project likely to meet the goals of Milestones 9 and 10 by June 30 and October 31, respectively? Yes, with carefully aggressive control room focus. (See AC presentations by Bartnik, Berg & Gulliford.)

AC charge



Milestone forecast

Milestones 9 & 10: “1-pass energy scan” and “1-pass ER” - have a modest amount of built-in schedule contingency - are relatively straightforward. - need milestone 10 before July 15 shutdown

Milestone 11: “4-pass ER” – (low current) - a schedule challenge - optimising the re-configurations is key.



4. Multi-pass commissioning: Is the strategy for moving from one-pass to multi-pass commissioning well thought out? Does the plan have sufficient flexibility to be able to respond to risks, should they occur? What are the leading risks? Risks:

a) Technical challenge b) Staff attrition c) Financial: operations burn rate

5. Goal prioritization: Are the relative prioritizations of achieving the multiple technical goals (total current, single bunch charge, recovery efficiency, etc) correct? We believe so, but seek AC feedback.

AC charge - 2



6. Strategies for future support: Have the PIs identified promising strategies for obtaining financial support for continued operation and exploitation of the CBETA facility after the end of NY State funding for construction and commissioning? Promising strategies are emerging. (See presentations by Hoffstaetter & Trbojevic.)

AC charge - 3



May 7, 2019 — through the FFA arc !



Backup slides



Milestone 9

9: Single Pass Beam Energy Scan 2019 June 30

a) Pass beam through MLC and around the arc once during this first phase of beam commissioning.

b) Test the ability of the arc magnets to pass a broad range of beam energies during this test.

c) Perform energy scan by adjusting the accelerating voltage of the MLC by activating the beam diagnostic systems. Document all results.



Milestone 10

10: Single Pass Beam with Energy Recovery 2019 Oct 31

a) Pass the beam through the MLC [twice] and decelerate it during the second time.

b) Measure the efficiency of the energy recovery of the accelerator at low currents.

c) Perform design of experiments on energy recovery variation with beam current and with other accelerator parameters.



Milestone 11

11: Four Pass Beam with Energy Recovery (low current) 2019 Dec 31

a) Pass the beam through the MLC 8 times in full operation.

b) Accelerate the beam to higher energies during 4 passes and then decelerating during the remaining 4 passes.

c) Document the results of this world-first experiment.



Milestone 12

12: Commission C-Beta and Complete the Project 2020 Apr 30

a) Measure all key parameters identified in Table 1 (Electron beam energy, electron bunch charge, gun current, bunch repetition rate, RF frequency, injector energy, RF operation mode, number of ERL turns, and energy aperture of arc)

b) Compare measured KPPs against the design requirements.

c) Commission C-Beta for further operation and experiments.

d) Prepare detailed comprehensive final report encompassing all activities performed.


Documents

Peggs Project Status 190509 · 3:40 Installation status and schedule Karl Smolenski 4:10 Impact of CBETA on EIC: hadron cooling Dejan Trbojevic 4:40 Executive session 5:30 Discussion