Caltech HEP Tier2 is accessible to all members of the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) in CERN, Geneva, Switzerland. Interactive logins to Caltech Tier 2 resources must comply with Caltech computing policies.

NOTE: This is a requirement for a CMS Caltech Tier2 account. For other Clusters – please consult with Supervisor at Caltech.

To be eligible for an account, a person must have an active assignment from Human Resources. Please get in touch with your Supervisor at Caltech and review the guidelines and information on the forms which must be submitted. Please submit completed documents to Tracy Sheffer at If you are unsure whether an individual’s activities would qualify as a Guest, Volunteer, or as External Affiliate, please contact Tracy Sheffer at for assistance.

Requesting Tier2 account

After HR confirms the appointment, the visitor, visitor’s sponsor, or supervisor should request the account by email to <T2 admins>. Send the following information:

  • Your Supervisor at Caltech full name and contact email;
  • your full name and institutional contact email (;
  • Your affiliation status with Caltech; Start and End dates;
  • Caltech access username and UID;
  • An SSH public key; (How to create SSH Key –
  • The initial account expiry date can be extended upon need (max 1 year for Caltech employees, and students, max 6 months for external); the End date can not exceed your affiliation end date.
  • (Required for CMS/CERN Collaborators) An X509 grid certificate distinguished name in the form of: /DC=ch/DC=cern/OU=Organic Units/OU=Users/CN=... from CRAB Prerequisites – Grid certificate ;
  • Brief description of why and what access is needed, e.g. “I need access to condor queues to conduct research for X.” or “I need X TB Storage for CRAB output files”, etc.

Updating Tier2 account

Please follow the same rules as Requesting a Tier2 account if your HR assignment is still active.

Personal websites

You can create a personal web page by making a directory named public_html within your Linux home directory. Within this directory, you should create index.html or index.php to act as your default home page. In addition, you need to make your home directory group and others readable, the same as creating a public_html directory.
You should be aware that you are responsible for any material or files you store or publish under this directory.