TRIUMF: Guide for experimenters

The purpose of this site is to provide all the necessary information to allow a User to propose, plan, and run an experiment at the ISAC Facility of TRIUMF. It has been created by the Beam Delivery group of the Accelerator Division [Link? -- ACM] and should be used in conjunction with the Experimental Program site managed by the Science Division(email?). This wiki is a work in progress and will be updated frequently. Please forward all comments, queries, and suggestions to Mike Trinczek(email).

Overview of Process...

In here, list the steps required to perform an experiment at TRIUMF, especially making sense of TSOP-07 - Approval of Experiments at TRIUMF and the revised two-stage EEC Approval Process. Need to consult with JMP, MM, BL, ...

ISAC Experimental Facilities and Research Groups

The ISAC Facility at TRIUMF has two experimental halls with a diverse range of Experimental Facilities and Research Groups, outlined in the figure below. (Place image of ISAC here. Update image to reflect current Experimental Facilities and beamlines. Get a 3D figure and decide how large a figure to offer and perhaps have it open in a new or pop-up window?) Each facility has a TRIUMF-based Coordinator who is responsible for the safe operation of the facility and will act as a User and Visitor liaison. Interested scientists should contact the appropriate Coordinator from the lists below to obtain more information. ISAC Low-Energy Experimental Facilities: Collection Station - Coordinator: TRINAT - Coordinator: John Behr 8π - Coordinator: Gordon Ball GPS1, GPS2, GPS3 General Purpose Stations - Coordinator: Gordon Ball Laser Spectroscopy - Coordinator: Matt Pearson Polarizer - Coordinator: Phil Levy βNMR and βNQR - Coordinator: Gerald Morris Osaka - Coordinator: TITAN - Coordinator: Jens Dilling ISAC-I (Accelerated) Experimental Facilities: DRAGON - Coordinator: Chris Ruiz TUDA - Coordinator: Pat Walden HEBT-GPS General Purpose Station - Coordinator: Dave Ottewell ISAC-II Experimental Facilities: HERACLES (Under construction) - Coordinator: Dave Ottewell SEBT-GPS General Purpose Station - Coordinator: Dave Ottewell TIGRESS - Coordinator: Greg Hackman EMMA (Under construction) - Coordinator: Barry Davids [We should link directly to contact information. Should we also include support groups (maybe in a different section)? Beam delivery, beam development, safety, etc.? -- ACM]

ISAC Accelerator Specifications

List the specs from Marco here... The ISAC accelerators offer different time structures, as listed in the following table: ISAC Accelerator Time Structure Frequency (MHz) Period (ns) RFQ Transmission (%) Chopped Comments 35.36 28.3 25 No 35.36 28.3 75 No Two satellite peaks [Huh? -- ACM] 11.78 84.8 73 Yes 5.89 169.7 37.5 Yes The ISAC-I Drift Tube Linac (DTL) can accelerate ions to the energies shown in the following table: ISAC-I Range of Energy A/Q Minimum Energy (MeV/u) Maximum Energy (MeV/u) 2 0.15 1.90 3 0.15 1.79 4 0.15 1.74 5 0.15 1.64 6 0.15 1.53 The ISAC II superconducting linac is capable of accelerating ions to the energies shown in the following table. Please note that the maximum energy is currently limited by TRIUMF's operating license to 5 MeV/u. ISAC-II Range of Energy A/Q Minimum Energy (MeV/u) Maximum Energy (MeV/u) 2 1.5 10.5 5.0 3 1.5 9.0 5.0 4 1.5 6.8 5.0 5 1.5 6.0 5.0 6 1.5 5.0 Specs Beam standard transverse dimensions (at a focal point) 2 mm [FWHM? RMS? -- ACM] Transverse emittance 2 π mm mrad Longitudinal emittance 1.5 keV/u ns (ion dependent) Longitudinal emittance 1.5 keV/u ns (ion dependent) Energy spread (FWHM) with no buncher <0.4% Energy spread (FWHM) with buncher 0.1% Time spread (FWHM) with buncher 1 ns Add a calculator to show the interplay between Energy Spread and Time Spread? [Or a chart -- ACM] Contact: Marco Marchetto (add contact info).

Tuning Time Estimates

To help Users better plan their experiments, a list of typical time estimates for established tuning procedures is shown below. These estimates should be used by the User to budget the necessary overhead for experimental start-up, energy changes, species changes... [Ask Bob about species changes! Ask Bob about start-up!] In addition, interruptions to beam delivery may occur. Some of these interruptions, such as those due to regular maintenance or proton therapy, are known at the time the Beam Schedule is prepared and scheduled accordingly. Others, such as work in the ISAC Target Hall, may not be known at the time of scheduling but are known on a time scale of weeks in advance. The Beam Delivery group will try to meet with the experimental spokesperson(s) prior to the beginning of an experiment to confirm what is required from a beam delivery standpoint and to assist with the preparation of a detailed running plan, taking into account these known, but not scheduled, interruptions. At ISAC, this planning may help a User decide the optimum time for an energy change or a species switch. Totally unplanned interruptions, such as those due to mechanical failures, are unavoidable. Because TRIUMF is a user facility, catering to many external experimenters, it is generally not possible to adjust the beam schedule in response to such interruptions. [List the tuning time overhead estimates here. Take numbers from REL file Procedures.doc on 14 Jun 07.] Tuning Time Estimates Procedure Time General tuning: Proton BL2A Stable beam in Pre-Accelerator section RIB in Pre-Accelerator section   1 hour 12 hours 4 hours ISAC-I LINAC tuning to full energy (OLIS to User) 12 hours ISAC-I energy change: Change to pilot beam Switch energy and optimize Change to RIB and optimize   0.5 hours 1 hour/tank [Define "tank" -- ACM] 1 hour ISAC-II LINAC tuning (from scratch) 4 hours ISAC-II energy change: Change to pilot beam Switch energy and optimize Change to RIB and optimize   0.5 hours 1 hour/cryomodule 0.5 hours Checking the tune: Cyclotron (minimize spills) Proton BL2A ISAC Pre-Accelerator section ISAC Accelerator section   4 hours 1 hour 2 hours 2 hours Maintenance Day (typical): Cyclotron off Cyclotron tuning ISAC Tuning   12 hours 2 hours 2 hours Proton Therapy (typical) 5 hours [Give a sample calculation of overhead estimate?] Contact: Bob Laxdal (add contact info).

ISAC Yield Measurements Database

The ISAC Yield Measurements database should be consulted for the measured intensities of available species. All yields are measured at the ISAC Yield Station unless otherwise noted. As such, the intensity delivered to any given experimental facility will depend upon the beam transport efficiency and the stripping efficiency, if needed. Delivered yields will be lower, especially for post-accelerated beams. Below is a table giving the approximate transmission to different experimental facility areas for given conditions. The measured yield value should be multiplied by this factor to obtain an approximate value of what intensity may be expected at an experiment facility. Need the numbers for different areas and conditions (stripping, chopping, ...) Do we mention that intensities drop over time (i.e. these should not be time-averaged expectations)? Beam Transmission Destination Transmission (%) Low-energy 85 ISAC-I 25 ISAC-II 25

List of Forms

Need to get the official new EEC approval process! Temporary links to required forms... Safety Approval of Experiments at TRIUMF Beam-Time Requests Beam Properties Request Form (PDF) TRIUMF Administration - Forms and Documents Repository Describe Colin's function here or in preamble?? [How about another link to a Beam Delivery group page, here or in the next section, where we can describe all of our functions? -- ACM]

Useful Links

Science Division wiki TRIUMF Experiments database Beam Schedule TRIUMF Safety homepage Visitors info needed - Josie? Temp link to TRIUMF Colours