# Presentation: 659779

## Closing Plenary SessionCommissioning and Accelerator Physics

- M. Syphers/FNAL
- 21 October 2004
- Napa, California

***bnl - fnal- lbnl - slac***

_**US LHC Accelerator Research Program**_

## Tuesday PM -- Agenda

**Napa, CA **19-21 Oct  2004Tuesday 19 Oct 04
**Commissioning and Accelerator Physics**
- 1:30  Greeting & Session Overview
- 	- M. Syphers [10m]
- 1:40  LHC Commissioning Plans and Status
- 	- R. Bailey [60m]
- 2:40  LARP Magnet Commissioning Issues and Plan
- 	- M. Lamm / R. Saban [45m]
- 3:25  Comments and Discussion on LARP Beam and Non-Beam Commissioning
- 	- E. Harms [20m]
- 3:45 		 *Break* [15m]
- 4:00  Wire Compensation Report
- 	- T. Sen [30m]
- 4:30  Report on Electron Cloud Activities
- 	- M. Furman [30m]
- 5:00  Possible Loops for Global Decoupling
- 	- Y. Luo [30m]
- 5:30  General Discussion

## Summaries

- First, report on accelerator physics ...
- ... then, commissioning

## SPS wire compensation

- Intensity Loss compensated by 2nd wire

- Emittance shaving   	occurs early

**SPS wire compensation**

*Reported:  T. Sen*

## SPS experiment – tune scan

*30.07.04*

- nearly perfect
- compensation

-                ?

- tune scan with compensation
- of 2 BBLRs in the CERN SPS
- near the LHC working point

*no BBLR*

*compensation*

*1 BBLR*

*path in the tune diagram*

- F. Zimmermann
-   *via T. Sen*

## Wire Compenstion Proposal

- Experimental demonstration of the principle in the SPS with one wire simulating the beam and the second as the compensator
- Experimental demonstration in a hadron collider (RHIC or Tevatron) or lepton collider (e.g. PEP-II) - *demonstrate use of the  wire for the benefit of this collider, e.g, as scraper, or for future upgrades.*
* ****RHIC - compensation of long-range collisions in eRHIC or after IR upgrades***
*** ******Tevatron - improving performance of  Run-II / BTeV***
- R&D on pulsed wire compensation system; possible test of pulsed wire on beam in existing machine
-  Design of compensation device for LHC assuming success of former points.

**Wire Compenstion Proposal**

## eCloud (M. Furman)Developments since FNAL LARP mtg. (June 2004)

**eCloud** *(M. Furman)*Developments since FNAL LARP mtg. (June 2004)

-  Participation in SPS EC runs (June 21-26, 2004)
-  CERN: Arduini, Jiménez, Baglin, Schulte; LARP: Iriso, Pivi, Furman
-  initial results: LHC-MAC mtg. #14 (Jul. 12-13, 2004)
-  ongoing analysis of results (US and CERN)
-  more RHIC results
-  Hseuh, Iriso, Zhang
-  initial results: Workshop on RHIC experiments (Sep. 16-17, 2004)
-  M. Jiménez visited BNL (late Sept. 2004)
-  formal proposal for e-detectors in RHIC
-  Iriso to leave BNL April 05
-  We’ll participate in the CARE HHH-2004 wkshp. (CERN, Nov. 8-11, 2004)
-  ECLOUD04 proceedings almost done!
- ...

## Electron Cloud -- Summary (M. Furman)

- Continue and increase SPS analysis via simulations
- plan to hire an UG student 1/2 time for this (soon, I hope)
- code benchmarking as part of the process (LARP-CARE collab.)
- Iriso-Peggs map technique: needs continuity after UI leaves
- who?
- Hopefully RHIC will not fully suppress the e-cloud with coated chambers!
- we need an e-cloud in the warm regions for better testing our simulations
- make sure we reach the point of installing the cold SD in RHIC
- I feel a lack of “critical mass” in the e-cloud effort
- leads to infrequent communication with CERN people
- it’s a nontrivial effort to keep up with CERN’s and other’s activities
- maybe it’s a temporary state...

## Global Decoupling Loops -- (Y. Luo)

- Scan (modulate) circuit strengths, look for direction of phase difference changes to see where to set skew quads

## Luo (cont’d)

## Commissioning

- Report on LHC commissioning plans and process -- Bailey
- Report on LARP IR hardware commissioning -- Lamm
- 		and, on general LHC hardware commissioning -- Saban
- Discussion of LARP involvement in beam commissioning, as well as non-beam commissioning -- Harms

## Commissioning (R. Bailey)

- First 4 or 5 years will be something like this

## 

Machine supervisor	weekly responsibility	need 4
EIC			on shift			need 7
Operator		on shift			need 7
Cryogenics operator	on shift			need 7

Accelerator Systems support
Accelerator Physics support

- Machine supervisor	weekly responsibility	need 4
- EIC			on shift			need 7
- Operator		on shift			need 7
- Cryogenics operator	on shift			need 7
- Accelerator Systems support
- Accelerator Physics support

***R. Bailey***

## Commissioning scenario

- LHC Commissioning Coordinator
- weekly responsibility for year 1, maybe year 2
- Shift workers
- CIC (on shift for year 1, maybe year 2)
- EIC for the future (on shift long term)
- Operator (on shift long term)
- Hardware commissioning veteran (year 1)
- Accelerator Systems Responsibilities
- Accelerator Physics Responsibilities

***R. Bailey***

## Accelerator Systems Responsibilities 

- All accelerator systems will need to be commissioned, first during hardware commissioning and later with beam. Once a system has been made to run, it will need frequent expert support to make it continue to work.
- While responsibility for the performance of any accelerator system rests clearly with the group(s) concerned, it would prove extremely useful to have personnel directly concerned with machine operation also involved. This would result in **a number of mini-teams** responsible for the exploitation of particular accelerator systems.

***R. Bailey***

## Accelerator Physics Responsibilities

- We will need a pool of accelerator physicists ready to push through particular phases of the commissioning program and to pick up on the inevitable surprises that will crop up along the way. **Qualifications are very similar to those of the CIC.** Although not shift work, must be committed to doing this until the LHC operation becomes routine.
- We will also need accelerator physicists responsible for specific aspects, or ‘beam-based systems’. This could be done in the style of **mini-teams** responsible for particular systems.

***R. Bailey***

## Bailey, cont’d

- LARP Involvement:
- In the present US-LARP proposal, resources are allocated for “Beam Commissioning and Accelerator Physics” activities from 2004 onwards, rising to significant numbers by 2007. In the discussions to date, we have made the point that the US-LARP commitment has to be made with **long-term** individual commitments of around **12 months**, and that US staff should come to perform a specific role in the beam commissioning work. It has also been clearly said that **CERN has to maintain sufficient expertise**, particularly on shift, to ensure long-term exploitation of the machine.

- With this in mind, we feel that a very limited number of US-LARP resources could participate in the shift rota. Rather, they would be best suited to the accelerator physics and equipment group support activities listed above.

## One of several lists, both HW    systems and AP

| System | AP | OP |  LARP / other |
| --- | --- | --- | --- |
| Beam in the injectors |  |  |  |
| SPS extraction, transfer, injection and first turn |  |  |  |
| Multi turn losses and BIS dependability |  |  |  |
| Clean Beam Extraction |  |  |  |
| Filling efficiency and flat bottom conditions |  |  |  |
| Ramp and squeeze quality |  |  |  |
| Longitudinal plane |  |  |  |
| Optics |  |  |  |
| Aperture |  |  |  |
| Field quality |  |  |  |
| Lifetimes |  |  |  |
| Separation schemes |  |  |  |
| Crossing angle schemes |  |  |  |
| Collisions and luminosity |  |  |  |
| Experimental conditions |  |  |  |
| Ions |  |  |  |

*One of several lists, both HW    systems and AP*
*Need to begin to fill out these lists...*

## LARP Hardware Commissioning Conclusions

- HC is an important way for the US to contribute to the LHC project
- Inner triplet HC contribution is established
- Recent new requests in global commissioning could greatly expand our role
- We have presented our best estimate of required costs for HC of inner triplet based on CERN schedule
- Plan for success (i.e funding and participation is minimal and without contingency)
- Does not include cost of participation in global HC
- Taking responsibilities in Inner Triplet Region (an area in which the US has a large and unique expertise) will help in the global HC (free up CERN personnel, LARP IR personnel can take on global jobs).
- Major uncertainties:
- Uncertainty in CERN schedule
- Cost of living in Geneva (addressed at LAPAC)
- Lining up the appropriate people at the right time

*M. Lamm*

## Commissioning -- Saban

- getting ready for the commissioning in general and the IT region in particular
- we need experts who will be active in the field
- with experience
- people in the tunnel *getting their hands dirty*
- to be deployed on hardware commissioning
- most critical need in electrical engineering, quench protection, machine interlocks
- we don’t encourage short term (<6 months)
- integrated in the equipment groups commissioning the hardware
- discussions are needed to finalize
- procedures,
- mission at CERN,
- roadmap in general, ...

- Summary from talk:

## Commissioning (E. Harms)

- 0.1 FTE in 2005
- 0.6 FTE in 2006
- 5-6 FTE in 2007 and beyond

## Commissioning (E. Harms)

- Is planned level of participation (budget) in 2005-2006 sufficient to ramp up efficiently for beam commissioning in succeeding years? (LAPAC voiced same concern in July)
- Names? Contact person(s) at collaborating laboratories.
- What role(s) should U.S. Scientists play at CERN?
- Length of visits?
- Is manpower available to assist in LHC checkout, etc.
- ?

## Commissioning -- Summary of Summaries

- Agree that AP/HW support efforts more feasible and more realistic rather than providing shift leaders, for example
- Note:  ‘support’ is very much Front Line, and essential
- Need to start identifying people now
- 				***NAMES -- NAMES -- NAMES *****!!**
- 	begin to fill up Roger’s chart(s)
- 	R. Bailey to meet with CERN departments, give presentation soon
- 	E. Harms to CERN 4-9 November for TI8 test; will meet with Bailey
- 	S. Peggs / M. Syphers / E. Harms will start polling people @ all labs
- 			-- availability
- 			-- expertise
- 			-- etc.  ...