3rd COLD meeting

Friday Jul 18, 2025, 11:00 AM → 12:50 PM Europe/Paris

CTRM meeting room

ZOOM LINK

Present:

• Simone Liuzzo

• Benoit Joly 

• Jean-Luc Revol 
• Yann Gouez 
• Reynald Bourtembourg 
• Kees-Bertus Scheidt 
• Qing Qin 
• Friederike Ewald 
• Benoit Roche 
• Hugo Pedroso Marques 
• Patrick Colomp 
• Chamseddine Benabderrahmane 
• Alessandro D'Elia 

 

FE: what will SLAC provide? 

SL: cryomodule and accelerating structures. If this will be possible. Else, we will purchase new ones.

FE: S-band or C-band?

SL: simulations and discussion with SLAC lead to the conclusion tht C-band is better. 

AdE: CFT for S-band RF-units has been submitted

KS: what kind of laser is needed:

FE: 50microJ commercial laser should fit the available specifications. Contact with INFN and companies for further investigations

HPM: vacuum needed for COLD project set up on the beam path but also on waveguides.

BR: a document including the COLD project technical details should be produced. 

SL: OK to do a CDR, starting from LongTermStrategicPlan and detailing the COLD project

All participants are ok with writing this document and are ready to contribute their section

YG: need to produce a feasibilty study. gather technial informations, even if not perfect. Inf can be updated later.  

YG: is a CTRM needed? Task added to WP-06-operation

YG: facility netwerok will be used for COLD. independent of operations. if there is a network issue, we can wait for the issue to be solved.

RB: protect hardware in case of power glitches.

BJ: no news for WP6  ut a meeting with SAFETY and LINAC group needs to be planned. 

RB: WP7 asked informations for control to M.Dubrulle. 

PC: klystron will need to be declared once on site. For 160MeV beam neutrons could be an issue. beam dump design needs carefull studies.

CB: data for TL1 like magnet provided. as there are no spares a new PM or EM will be designed. 

SL: an EM would be better, if possible.

SL: COLD simulations are ok. expected emittance after Acc.Struct. 10mmmrad and bunch length 1.3ps.

AdE: for 6GeV linac C-band photogun will be likely the best choice. Tested designs with high field on the cathod have been done at INFN and PSI.

JLR: will take care of the organization of IPAC2026 satellite meeting on the COLD project.

 

 

11:05 AM → 11:15 AM general project update

Collaboration Contract

Speaker: Simone Liuzzo (ESRF)

11:15 AM → 11:35 AM WP status round table

WP 01 RF
WP 02 Diagnostics
WP 03 Vacuum
WP 04 Mechanical Engineering:

From the WP4 working package, no news. We have many 3D drawings, the last one exist but it is no possible to download it and use it, but it should not be a big deal to get it with the correct format.

WP 05 Infrastructure
WP 06 Operation
WP 07 Control
WP 08 Alignment
WP 09 Safety
WP 10 Magnets
WP 11 Beam Dynamics

11:35 AM → 11:45 AM WP01: RF

CFT

Speaker: Alessandro D'Elia (ESRF)

3rdCOLD_Meeting.pptx

11:45 AM → 12:00 PM WP05 infrastructure

informations needed for feasibility study

Speaker: Yann Gouez (ESRF)

COLD_ infrastructure information.xlsx

12:00 PM → 12:15 PM WP11 Beam Dynamics

COLD project set up multi particle tracking simulations

Speaker: Simone Liuzzo (ESRF)

COLD_LowEnergyLinacSimulations [Autosaved].pptx

12:15 PM → 12:25 PM Planning and budget review

Speaker: Simone Liuzzo (ESRF)

12:25 PM → 12:35 PM AOB

Human resources? Diag, RF?

LTSP document:
https://www.overleaf.com/read/nsvfrbjwfykb#effb67

List of pending action:
https://confluence.esrf.fr/display/PROJCOLD/Meeting+notes

Alessandro Vannozzi (INFN-LNF) on solenoid consumption/cooling:

Ti riporto sia i dati lato DC, così da regolarti sulla taglia degli alimentatori (qualora volessi acquistarne uno di taglia uguale), sia lato AC per valutarne i consumi in termini di potenza assorbita

SOLENOIDE GUN

LATO DC

I= 192A
V=40 V

LATO AC

Potenza assorbita=10 kW (3fase)

SPECIFICHE RAFFREDDAMENTO

Utilizzo acqua demineralizzata
Q= 5 l/min
ΔP=3 bar
ΔT=20°C

SOLENOIDI SEZIONI ACCELERANTI

Gli alimentatori per ciascun solenoide sono 4 che alimentano 3 bobine collegate in serie per un totale di 12 bobine per ciascun solenoide. Ti riporto i dati per ciascun alimentatore e per il solenoide in complessivo.

NB: per il raffreddamento, essendo tutte le bobine connesse in parallelo idraulico, vedrai che le portate si sommano mentre la caduta di pressione resta costante sia per le 3 bobine in serie che per tutto il solenoide

LATO DC (per ciascun alimentatore)

I=190A
V=81V

LATO AC

Potenza assorbita=20 kW (per ciascun alimentatore)
Potenza assorbita=80 kW (a solenoide)

SPECIFICHE RAFFREDDAMENTO

Utilizzo acqua demineralizzata
Q= 12 l/min (per 3 bobine in serie)
ΔP=2 bar
ΔT=15°C

Per tutto il magnete

Q= 48 l/min (per tutto il solenoide)
ΔP=2 bar
ΔT=15°C

12:35 PM → 12:45 PM update confluence page

check Pending Actions list from previous meetings

https://confluence.esrf.fr/display/PROJCOLD/COLD%3A+Cool+copper+Operation+Linac+Demonstrator