PXIE Ion Source and LEBT Installation Status L. Prost, B. Hanna, R. Andrews Project X Technical Meeting October 29 th, 2013

Ion Source Installation 2

Page 3 Layout (reminder) Note: In light green, distances dictated by optics solution(s); have been set for ~ 2 years.

3D model (partial) 4 Emittance scanners (only one at first but can be used for both directions) Gate valve DCCT Turbo pumps Chopper

First set-up 5 Faraday Cup (protective ‘cover’ not shown) Emittance scanner drive assembly (probably not ready for first beam) IS body Turbo pump

Ion Source Assembly at CMTF Page 6 Ion Source moved to the cave (10/15) and aligned with respect to the reference beam line –Includes Faraday cup –Vacuum: ~1  Torr Faraday cup (inside) Isolated cable tray (from HV cabinet to IS) IS vacuum chamber IS body Water distribution system

IS Electrical Page 7 Two cabinets (HV and LV) in the cave: –One ‘floating’ at HV (-30 kV) and connected to the source body Racks complete –Safety document written and reviewed by AD EE Support for HV cabinet One more walkthrough needed for ‘unattended‘ operation approval Does not include the source itself at this time –Isolation transformers test may be done this week Check that they don’t overheat while in the cabinet –They were tested upon delivery but not in an enclosed volume Isolation transformers Bias PS LV rack HV rack (at elevated potential, -30 kV)

Infrastructure Page 8 Electrical distribution system almost complete –Most cable pulls finished yesterday Includes fibers optics for controls –Various ‘small’ jobs remain E.g.: cable terminations Water system almost complete –Hoses to be hooked up to the source this week Source body, back-plate, filament, extraction and control electrodes, and Faraday cup –Instrumentation (flow meters, pressure gauges…) are being wired (today) Hydrogen distribution system installation in progress –Scheme/routing agreed upon with Safety –Will need formal review from the Hydrogen Safety Committee

Controls Page 9 PLC for H 2 flow control valve installed (has been for a while) –Programming remains to be done Same clock system as for NML –All hardware in place Fiber optics ran into the enclosure yesterday –For control of PSs in the IS HV rack Controls rack Enclosure for H 2 bottle Mass flow controller

Instrumentation Page 10 Emittance scanner –Parts for emittance scanner ordered (SNS) –Assembly and testing at Oak Ridge before being shipped to Fermilab January ’14? –Stand alone control system But data output accessible through ACNET Hardware being procured Coding in progress Faraday cup (designed and built in-house) –Attached to IS vacuum chamber with protective cover (personnel safety) –Thermo-couples and signal output cable remain to be installed

Safety documentation Page 11 LOTO procedure for IS electrical cabinets has been written –Reviewed (and approved) by Dan Wolf Draft (advanced) of the H 2 safety document –Will need to be updated after final installation of the H 2 distribution system –Will be the main document for Hydrogen Safety Committee review Draft write-up for rad and electrical safety has been sent to Safety dpt. –Safety officers have been assigned to review and guide us on what else needs to be done or corrected What has been submitted should be relatively close to a final version John Anderson requested that we go through a formal ORC –i.e. Need Roger’s approval before firing up !

Timeline Page 12 Installation complete: First week of November Safety review(s): Second week of November Commissioning starts: Third week of November First measurable beam: First week of December (?)

LEBT 13

Solenoids Page 14 First solenoid delivered ~2 weeks ago QC in progress –Several magnetic field measurements have been completed (but not all… yet) Dipole correctors have a relatively big ‘roll’ (~6°) Not specified to vendor but will have to be corrected for the other 3 solenoids –Magnetic center line has been referenced Have all the parts (and PSs) to build controls rack… –… but no manpower (EE Support)

Magnetic field linearity (with respect to current) Page 15 Longitudinal field strength measurement at the center of the solenoid as a function of the solenoid current Ratio of the longitudinal magnetic field to the solenoid current as a function of the beam current, normalized to the average value of this ratio Longitudinal magnetic field vs solenoid current relationship linear to within <1% from 50 A to 300 A Nominal range of operation

First prototype has been fabricated –Can be installed on the solenoid when appropriate There may be a possibility of testing it with beam without the solenoid Isolated diaphragm Page 16 Cooling channel Diaphragm (electrically isolated) Cooling channel Flange (welded after installation inside solenoid bore)

Chopper (and Toroid) Page 17 Mechanical design –Remains conceptual at this point –Beam line geometry needs to take into account the space needed for the toroid ‘De-scoped’ (e.g.: Project X-Document #1219) –Slower pulsing frequency (nominal 60 Hz)  Re-use ecool modulator –Work on driver started this month (G. Saewert) Sol. #2 Sol. #3 Isolated diaphragm assembly Chopper assemblyToroid Isolated diaphragm assembly

LEBT installation outlook Page 18 First solenoid installed in January –Emittance scanner mid-January ? Last 3 solenoids delivered in February Chopper prototype complete in April

Setup with one solenoid (I) Page 19 Diagnostics box (former IS vacuum chamber) Emittance scanner Biased aperture (maybe) DCCT Faraday cup Ion Source

Setup with one solenoid (II) Page 20 Diagnostics box (former IS vacuum chamber) Emittance scanner Faraday cup Ion Source

Summary Page 21 Installation of the IS infrastructure and IS assembly proper has progressed very well over the past couple of months –It is realistic to expect beam (10 mA?) before Christmas ! While all components of the LEBT have not been designed in detail, there has been good discussions on various concepts and we are converging –Expects preliminary drawings of the entire beam line with all components before the end of CY’13

Additional/backup slides 22

Nominal beam envelope Page 23 Beam envelope (calculated with VACO) – Gaussian distribution, 10 mA Z [m] Beam size, 2.5  [cm] X in red, y in blue Beam size, ±2.5  [cm] Outermost particle Normalized, rms emittance [mm mrad] Emittance growth Neutralization factor Kicker electrodes Aperture restriction (e.g.: ‘collimator’, ceramic break…) An important constraint for the beam envelope is the capabilities of the chopper. On the other hand, the larger the beam size near the chopper, the least emittance growth. < 0.25 mm mrad