1. NCFE and Interfaces Meeting: DTL
Andrea Pisent

2. DTL organization in INFN
Andrea Pisent (WU coordinator, LNL)
Francesco Grespan (deputy coordinator, LNL)
Paolo Mereu (Mechanics design responsible, Torino), Matteo Mezzano , Carlo Mingioni, Marco Nenni, Luigi Ferrari, Paolo Bottin
Michele Comunian (Beam dynamics, LNL) Luca Bellan
Carlo Roncolato (Vacuum system LNL)
Giorgio Mauro, Antonio Palmieri, Francesco Grespan (RF design, LNL)
Marco Poggi (Beam instrumentation, LNL)
Mauro Giacchini, Loris Antoniazzi, Maurizio Montis (Local Control System, LNL, TBD)
Collaboration with Elettra (Trieste) for the dipole steering magnets and PS design and prototyping, Davide Castronovo and Roberto Visentini
Elettra
LNL
Torino
Istituto Nazionale di Fisica Nucleare (Italy)

3. Overall design
Istituto Nazionale di Fisica Nucleare (Italy)

4. Recent achievements
Forged SS tubes, kick off meeting happened, prototype realizes (SPES RFQ geometry), first delivery (tank4, tank3, partial tank1, RFQ SPES) 18th week (end April)
Tender for the machining of tanks 3 and 4 concluded (approved by GE). Contract with Cinel SRL in the next weeks.
Mechanical engineering group in Torino reinforced, most of the drawings for all tanks and lay our ready (tender for machining of tank in CD March?).
PMQ tendering on going, technical and economical offers to be evaluated next week.
Rough material for tank 4 mod 3, 403 L forged
Istituto Nazionale di Fisica Nucleare (Italy)

5. Recent achievements
Physics design: closed the change for the position of the steerers (regular in betatron phase advance, less redundancy in last tanks) and for the weaker PMQ in tank5 to match the spoke section.
RF Design and stabilizing system verified and bead pulling procedure under preparation (technical meeting with S. Ramberger, preliminary design of a full scale aluminium mock up).
A change request for using the pulsed steerers has been prepared (approved?).
Istituto Nazionale di Fisica Nucleare (Italy)

6. B=Beam Position monitor
Q=PMQ
Sy,Sx=Steerers
C=ACCT
B=Beam Position monitor
-/+Q = defocusing/focusing effect for proton beam in the Horizontal plane
Sx/Sy = Horizontal/Vertical deflection of proton beam.
The Layout is the DTL “V86”: the PMQs are being purchased
Istituto Nazionale di Fisica Nucleare (Italy)

7. Recent achievements
Two DT prototypes (PMQ and BPM, same geometry as for steerers) successfully completed (machining and brazing at INFN, e-bem welding in Zanon, magnetic measurements at CERN).
To be noted
Qualified local company for deep drilling and SS stem production
INFN machining for all the other parts
Qualified local company for Ni and Cu plating
Single brazing in vacuum furnace of both prototypes (ok)
CMM qualification of all steps
Successful PMQ positioning with remachining of reference plans
Successful vacuum tests after ebeam welding
Succesfull PMQ magnetic measurement after welding
Second BPM prototype under construction
The production of DTs for tanks 4 an 1 will be done internally (same procedure as prototypes)
Istituto Nazionale di Fisica Nucleare (Italy)

10. BPM drift tube

11. Prototypes compleated

12. Open interface issues (main)
Istituto Nazionale di Fisica Nucleare (Italy)
Intertank black coating for NPM
ACCT vacuum load
Arc detectors in RF windows
RGA 100 h

13. DTL commissioning plan proposed
Phase scan of Tank1 looking to BPM1 and BPM2
inside Tank1 (reference phase is 0 deg)
Tank
Phase
Field
Emittance
Transmission T1
D-plate
BCM T1, D-Plate T2
BPM T3 -
BCM T3 T3
BPM T4
BCM T4in T4
BCM T4out, D-Plate T5
BCM T5, D-Plate
Once Tank1 has been commissioned and the D-plate has been replaced by Tank2, DTL commissioning will proceed, using in-line diagnostics up to the end of Tank4. The RF set point in amplitude and phase will be determined by phase scan method for Tank2 and Tank3, looking to the BPM located in the next tank turned off.
Simulations show that transmission out of Tank3 is better than 99.9% for the entire phase and amplitude scan of Tank2, which makes acceptance scan technique difficult to implement for second and third DTL beam commissioning phases. RF set point of Tank4 and Tank5 requires external BPMs. In order to have a counter calibration of the BCMs after each Tank, the diagnostic plate should be equipped with a Faraday Cup with proper power range for 90 MeV beam commissioning.
Phase scan of Tank1 looking the induced phase shift between two external BPMs,
located 1.06 m apart each other (around 6 bl).
LINAC16: MOPLR059 Commissioning Plans for the ESS DTL. M. Comunian, L. Bellan, F. Grespan, A. Pisent, M. Eshraqi, R. Miyamoto

14. Computer control system
EPICS and slow PLC controls (vacuum/interlocks)
HMI ( human machine interface)
Documentation
Maintenance during maximun of 2 years after delivery in Lund
LNL may contribute to part of EPICS ICS with responsibility of open WPs
2-3 Feb ICS meeting at LNL
Cabling racks to be decided after definition of responsibilities
Istituto Nazionale di Fisica Nucleare (Italy)

15. RATS
Specifications of the DTL workshop given to ESS, and the choice if the site is well advanced (we have been told).
Space requirement has increased to mitigate possible schedule problems
Preliminary design of the temporary supports for module alignment
Istituto Nazionale di Fisica Nucleare (Italy)